diff options
Diffstat (limited to 'arch/x86/boot')
47 files changed, 6608 insertions, 0 deletions
diff --git a/arch/x86/boot/.gitignore b/arch/x86/boot/.gitignore new file mode 100644 index 00000000000..18465143cfa --- /dev/null +++ b/arch/x86/boot/.gitignore @@ -0,0 +1,5 @@ +bootsect +bzImage +setup +setup.bin +setup.elf diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile new file mode 100644 index 00000000000..cb1035f2b7e --- /dev/null +++ b/arch/x86/boot/Makefile @@ -0,0 +1,171 @@ +# +# arch/x86/boot/Makefile +# +# This file is subject to the terms and conditions of the GNU General Public +# License. See the file "COPYING" in the main directory of this archive +# for more details. +# +# Copyright (C) 1994 by Linus Torvalds +# + +# ROOT_DEV specifies the default root-device when making the image. +# This can be either FLOPPY, CURRENT, /dev/xxxx or empty, in which case +# the default of FLOPPY is used by 'build'. + +ROOT_DEV := CURRENT + +# If you want to preset the SVGA mode, uncomment the next line and +# set SVGA_MODE to whatever number you want. +# Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode. +# The number is the same as you would ordinarily press at bootup. + +SVGA_MODE := -DSVGA_MODE=NORMAL_VGA + +# If you want the RAM disk device, define this to be the size in blocks. + +#RAMDISK := -DRAMDISK=512 + +targets := vmlinux.bin setup.bin setup.elf zImage bzImage +subdir- := compressed + +setup-y += a20.o apm.o cmdline.o copy.o cpu.o cpucheck.o edd.o +setup-y += header.o main.o mca.o memory.o pm.o pmjump.o +setup-y += printf.o string.o tty.o video.o version.o voyager.o + +# The link order of the video-*.o modules can matter. In particular, +# video-vga.o *must* be listed first, followed by video-vesa.o. +# Hardware-specific drivers should follow in the order they should be +# probed, and video-bios.o should typically be last. +setup-y += video-vga.o +setup-y += video-vesa.o +setup-y += video-bios.o +targets += $(setup-y) +hostprogs-y := tools/build + +HOSTCFLAGS_build.o := $(LINUXINCLUDE) + +# --------------------------------------------------------------------------- + +# How to compile the 16-bit code. Note we always compile for -march=i386, +# that way we can complain to the user if the CPU is insufficient. +cflags-i386 := +cflags-x86_64 := -m32 +CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \ + $(cflags-$(ARCH)) \ + -Wall -Wstrict-prototypes \ + -march=i386 -mregparm=3 \ + -include $(srctree)/$(src)/code16gcc.h \ + -fno-strict-aliasing -fomit-frame-pointer \ + $(call cc-option, -ffreestanding) \ + $(call cc-option, -fno-toplevel-reorder,\ + $(call cc-option, -fno-unit-at-a-time)) \ + $(call cc-option, -fno-stack-protector) \ + $(call cc-option, -mpreferred-stack-boundary=2) +AFLAGS := $(CFLAGS) -D__ASSEMBLY__ + +$(obj)/zImage: IMAGE_OFFSET := 0x1000 +$(obj)/zImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) +$(obj)/bzImage: IMAGE_OFFSET := 0x100000 +$(obj)/bzImage: EXTRA_CFLAGS := -D__BIG_KERNEL__ +$(obj)/bzImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) -D__BIG_KERNEL__ +$(obj)/bzImage: BUILDFLAGS := -b + +quiet_cmd_image = BUILD $@ +cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/setup.bin \ + $(obj)/vmlinux.bin $(ROOT_DEV) > $@ + +$(obj)/zImage $(obj)/bzImage: $(obj)/setup.bin \ + $(obj)/vmlinux.bin $(obj)/tools/build FORCE + $(call if_changed,image) + @echo 'Kernel: $@ is ready' ' (#'`cat .version`')' + +$(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE + $(call if_changed,objcopy) + +SETUP_OBJS = $(addprefix $(obj)/,$(setup-y)) + +LDFLAGS_setup.elf := -T +$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE + $(call if_changed,ld) + +OBJCOPYFLAGS_setup.bin := -O binary + +$(obj)/setup.bin: $(obj)/setup.elf FORCE + $(call if_changed,objcopy) + +$(obj)/compressed/vmlinux: FORCE + $(Q)$(MAKE) $(build)=$(obj)/compressed IMAGE_OFFSET=$(IMAGE_OFFSET) $@ + +# Set this if you want to pass append arguments to the zdisk/fdimage/isoimage kernel +FDARGS = +# Set this if you want an initrd included with the zdisk/fdimage/isoimage kernel +FDINITRD = + +image_cmdline = default linux $(FDARGS) $(if $(FDINITRD),initrd=initrd.img,) + +$(obj)/mtools.conf: $(src)/mtools.conf.in + sed -e 's|@OBJ@|$(obj)|g' < $< > $@ + +# This requires write access to /dev/fd0 +zdisk: $(BOOTIMAGE) $(obj)/mtools.conf + MTOOLSRC=$(obj)/mtools.conf mformat a: ; sync + syslinux /dev/fd0 ; sync + echo '$(image_cmdline)' | \ + MTOOLSRC=$(src)/mtools.conf mcopy - a:syslinux.cfg + if [ -f '$(FDINITRD)' ] ; then \ + MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' a:initrd.img ; \ + fi + MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) a:linux ; sync + +# These require being root or having syslinux 2.02 or higher installed +fdimage fdimage144: $(BOOTIMAGE) $(obj)/mtools.conf + dd if=/dev/zero of=$(obj)/fdimage bs=1024 count=1440 + MTOOLSRC=$(obj)/mtools.conf mformat v: ; sync + syslinux $(obj)/fdimage ; sync + echo '$(image_cmdline)' | \ + MTOOLSRC=$(obj)/mtools.conf mcopy - v:syslinux.cfg + if [ -f '$(FDINITRD)' ] ; then \ + MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' v:initrd.img ; \ + fi + MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) v:linux ; sync + +fdimage288: $(BOOTIMAGE) $(obj)/mtools.conf + dd if=/dev/zero of=$(obj)/fdimage bs=1024 count=2880 + MTOOLSRC=$(obj)/mtools.conf mformat w: ; sync + syslinux $(obj)/fdimage ; sync + echo '$(image_cmdline)' | \ + MTOOLSRC=$(obj)/mtools.conf mcopy - w:syslinux.cfg + if [ -f '$(FDINITRD)' ] ; then \ + MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' w:initrd.img ; \ + fi + MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) w:linux ; sync + +isoimage: $(BOOTIMAGE) + -rm -rf $(obj)/isoimage + mkdir $(obj)/isoimage + for i in lib lib64 share end ; do \ + if [ -f /usr/$$i/syslinux/isolinux.bin ] ; then \ + cp /usr/$$i/syslinux/isolinux.bin $(obj)/isoimage ; \ + break ; \ + fi ; \ + if [ $$i = end ] ; then exit 1 ; fi ; \ + done + cp $(BOOTIMAGE) $(obj)/isoimage/linux + echo '$(image_cmdline)' > $(obj)/isoimage/isolinux.cfg + if [ -f '$(FDINITRD)' ] ; then \ + cp '$(FDINITRD)' $(obj)/isoimage/initrd.img ; \ + fi + mkisofs -J -r -o $(obj)/image.iso -b isolinux.bin -c boot.cat \ + -no-emul-boot -boot-load-size 4 -boot-info-table \ + $(obj)/isoimage + rm -rf $(obj)/isoimage + +zlilo: $(BOOTIMAGE) + if [ -f $(INSTALL_PATH)/vmlinuz ]; then mv $(INSTALL_PATH)/vmlinuz $(INSTALL_PATH)/vmlinuz.old; fi + if [ -f $(INSTALL_PATH)/System.map ]; then mv $(INSTALL_PATH)/System.map $(INSTALL_PATH)/System.old; fi + cat $(BOOTIMAGE) > $(INSTALL_PATH)/vmlinuz + cp System.map $(INSTALL_PATH)/ + if [ -x /sbin/lilo ]; then /sbin/lilo; else /etc/lilo/install; fi + +install: + sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $(BOOTIMAGE) System.map "$(INSTALL_PATH)" diff --git a/arch/x86/boot/a20.c b/arch/x86/boot/a20.c new file mode 100644 index 00000000000..31348d054fc --- /dev/null +++ b/arch/x86/boot/a20.c @@ -0,0 +1,161 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/a20.c + * + * Enable A20 gate (return -1 on failure) + */ + +#include "boot.h" + +#define MAX_8042_LOOPS 100000 + +static int empty_8042(void) +{ + u8 status; + int loops = MAX_8042_LOOPS; + + while (loops--) { + io_delay(); + + status = inb(0x64); + if (status & 1) { + /* Read and discard input data */ + io_delay(); + (void)inb(0x60); + } else if (!(status & 2)) { + /* Buffers empty, finished! */ + return 0; + } + } + + return -1; +} + +/* Returns nonzero if the A20 line is enabled. The memory address + used as a test is the int $0x80 vector, which should be safe. */ + +#define A20_TEST_ADDR (4*0x80) +#define A20_TEST_SHORT 32 +#define A20_TEST_LONG 2097152 /* 2^21 */ + +static int a20_test(int loops) +{ + int ok = 0; + int saved, ctr; + + set_fs(0x0000); + set_gs(0xffff); + + saved = ctr = rdfs32(A20_TEST_ADDR); + + while (loops--) { + wrfs32(++ctr, A20_TEST_ADDR); + io_delay(); /* Serialize and make delay constant */ + ok = rdgs32(A20_TEST_ADDR+0x10) ^ ctr; + if (ok) + break; + } + + wrfs32(saved, A20_TEST_ADDR); + return ok; +} + +/* Quick test to see if A20 is already enabled */ +static int a20_test_short(void) +{ + return a20_test(A20_TEST_SHORT); +} + +/* Longer test that actually waits for A20 to come on line; this + is useful when dealing with the KBC or other slow external circuitry. */ +static int a20_test_long(void) +{ + return a20_test(A20_TEST_LONG); +} + +static void enable_a20_bios(void) +{ + asm volatile("pushfl; int $0x15; popfl" + : : "a" ((u16)0x2401)); +} + +static void enable_a20_kbc(void) +{ + empty_8042(); + + outb(0xd1, 0x64); /* Command write */ + empty_8042(); + + outb(0xdf, 0x60); /* A20 on */ + empty_8042(); +} + +static void enable_a20_fast(void) +{ + u8 port_a; + + port_a = inb(0x92); /* Configuration port A */ + port_a |= 0x02; /* Enable A20 */ + port_a &= ~0x01; /* Do not reset machine */ + outb(port_a, 0x92); +} + +/* + * Actual routine to enable A20; return 0 on ok, -1 on failure + */ + +#define A20_ENABLE_LOOPS 255 /* Number of times to try */ + +int enable_a20(void) +{ + int loops = A20_ENABLE_LOOPS; + +#if defined(CONFIG_X86_ELAN) + /* Elan croaks if we try to touch the KBC */ + enable_a20_fast(); + while (!a20_test_long()) + ; + return 0; +#elif defined(CONFIG_X86_VOYAGER) + /* On Voyager, a20_test() is unsafe? */ + enable_a20_kbc(); + return 0; +#else + while (loops--) { + /* First, check to see if A20 is already enabled + (legacy free, etc.) */ + if (a20_test_short()) + return 0; + + /* Next, try the BIOS (INT 0x15, AX=0x2401) */ + enable_a20_bios(); + if (a20_test_short()) + return 0; + + /* Try enabling A20 through the keyboard controller */ + empty_8042(); + if (a20_test_short()) + return 0; /* BIOS worked, but with delayed reaction */ + + enable_a20_kbc(); + if (a20_test_long()) + return 0; + + /* Finally, try enabling the "fast A20 gate" */ + enable_a20_fast(); + if (a20_test_long()) + return 0; + } + + return -1; +#endif +} diff --git a/arch/x86/boot/apm.c b/arch/x86/boot/apm.c new file mode 100644 index 00000000000..eab50c55a3a --- /dev/null +++ b/arch/x86/boot/apm.c @@ -0,0 +1,98 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * Original APM BIOS checking by Stephen Rothwell, May 1994 + * (sfr@canb.auug.org.au) + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/apm.c + * + * Get APM BIOS information + */ + +#include "boot.h" + +#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE) + +int query_apm_bios(void) +{ + u16 ax, bx, cx, dx, di; + u32 ebx, esi; + u8 err; + + /* APM BIOS installation check */ + ax = 0x5300; + bx = cx = 0; + asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp ; setc %0" + : "=d" (err), "+a" (ax), "+b" (bx), "+c" (cx) + : : "esi", "edi"); + + if (err) + return -1; /* No APM BIOS */ + + if (bx != 0x504d) /* "PM" signature */ + return -1; + + if (!(cx & 0x02)) /* 32 bits supported? */ + return -1; + + /* Disconnect first, just in case */ + ax = 0x5304; + bx = 0; + asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp" + : "+a" (ax), "+b" (bx) + : : "ecx", "edx", "esi", "edi"); + + /* Paranoia */ + ebx = esi = 0; + cx = dx = di = 0; + + /* 32-bit connect */ + asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp ; setc %6" + : "=a" (ax), "+b" (ebx), "+c" (cx), "+d" (dx), + "+S" (esi), "+D" (di), "=m" (err) + : "a" (0x5303)); + + boot_params.apm_bios_info.cseg = ax; + boot_params.apm_bios_info.offset = ebx; + boot_params.apm_bios_info.cseg_16 = cx; + boot_params.apm_bios_info.dseg = dx; + boot_params.apm_bios_info.cseg_len = (u16)esi; + boot_params.apm_bios_info.cseg_16_len = esi >> 16; + boot_params.apm_bios_info.dseg_len = di; + + if (err) + return -1; + + /* Redo the installation check as the 32-bit connect; + some BIOSes return different flags this way... */ + + ax = 0x5300; + bx = cx = 0; + asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp ; setc %0" + : "=d" (err), "+a" (ax), "+b" (bx), "+c" (cx) + : : "esi", "edi"); + + if (err || bx != 0x504d) { + /* Failure with 32-bit connect, try to disconect and ignore */ + ax = 0x5304; + bx = 0; + asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp" + : "+a" (ax), "+b" (bx) + : : "ecx", "edx", "esi", "edi"); + return -1; + } + + boot_params.apm_bios_info.version = ax; + boot_params.apm_bios_info.flags = cx; + return 0; +} + +#endif diff --git a/arch/x86/boot/bitops.h b/arch/x86/boot/bitops.h new file mode 100644 index 00000000000..8dcc8dc7db8 --- /dev/null +++ b/arch/x86/boot/bitops.h @@ -0,0 +1,45 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/bitops.h + * + * Very simple bitops for the boot code. + */ + +#ifndef BOOT_BITOPS_H +#define BOOT_BITOPS_H +#define _LINUX_BITOPS_H /* Inhibit inclusion of <linux/bitops.h> */ + +static inline int constant_test_bit(int nr, const void *addr) +{ + const u32 *p = (const u32 *)addr; + return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0; +} +static inline int variable_test_bit(int nr, const void *addr) +{ + u8 v; + const u32 *p = (const u32 *)addr; + + asm("btl %2,%1; setc %0" : "=qm" (v) : "m" (*p), "Ir" (nr)); + return v; +} + +#define test_bit(nr,addr) \ +(__builtin_constant_p(nr) ? \ + constant_test_bit((nr),(addr)) : \ + variable_test_bit((nr),(addr))) + +static inline void set_bit(int nr, void *addr) +{ + asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr)); +} + +#endif /* BOOT_BITOPS_H */ diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h new file mode 100644 index 00000000000..20bab9431ac --- /dev/null +++ b/arch/x86/boot/boot.h @@ -0,0 +1,296 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/boot.h + * + * Header file for the real-mode kernel code + */ + +#ifndef BOOT_BOOT_H +#define BOOT_BOOT_H + +#ifndef __ASSEMBLY__ + +#include <stdarg.h> +#include <linux/types.h> +#include <linux/edd.h> +#include <asm/boot.h> +#include <asm/bootparam.h> + +/* Useful macros */ +#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) + +extern struct setup_header hdr; +extern struct boot_params boot_params; + +/* Basic port I/O */ +static inline void outb(u8 v, u16 port) +{ + asm volatile("outb %0,%1" : : "a" (v), "dN" (port)); +} +static inline u8 inb(u16 port) +{ + u8 v; + asm volatile("inb %1,%0" : "=a" (v) : "dN" (port)); + return v; +} + +static inline void outw(u16 v, u16 port) +{ + asm volatile("outw %0,%1" : : "a" (v), "dN" (port)); +} +static inline u16 inw(u16 port) +{ + u16 v; + asm volatile("inw %1,%0" : "=a" (v) : "dN" (port)); + return v; +} + +static inline void outl(u32 v, u16 port) +{ + asm volatile("outl %0,%1" : : "a" (v), "dN" (port)); +} +static inline u32 inl(u32 port) +{ + u32 v; + asm volatile("inl %1,%0" : "=a" (v) : "dN" (port)); + return v; +} + +static inline void io_delay(void) +{ + const u16 DELAY_PORT = 0x80; + asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT)); +} + +/* These functions are used to reference data in other segments. */ + +static inline u16 ds(void) +{ + u16 seg; + asm("movw %%ds,%0" : "=rm" (seg)); + return seg; +} + +static inline void set_fs(u16 seg) +{ + asm volatile("movw %0,%%fs" : : "rm" (seg)); +} +static inline u16 fs(void) +{ + u16 seg; + asm volatile("movw %%fs,%0" : "=rm" (seg)); + return seg; +} + +static inline void set_gs(u16 seg) +{ + asm volatile("movw %0,%%gs" : : "rm" (seg)); +} +static inline u16 gs(void) +{ + u16 seg; + asm volatile("movw %%gs,%0" : "=rm" (seg)); + return seg; +} + +typedef unsigned int addr_t; + +static inline u8 rdfs8(addr_t addr) +{ + u8 v; + asm volatile("movb %%fs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr)); + return v; +} +static inline u16 rdfs16(addr_t addr) +{ + u16 v; + asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); + return v; +} +static inline u32 rdfs32(addr_t addr) +{ + u32 v; + asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); + return v; +} + +static inline void wrfs8(u8 v, addr_t addr) +{ + asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "r" (v)); +} +static inline void wrfs16(u16 v, addr_t addr) +{ + asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "r" (v)); +} +static inline void wrfs32(u32 v, addr_t addr) +{ + asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "r" (v)); +} + +static inline u8 rdgs8(addr_t addr) +{ + u8 v; + asm volatile("movb %%gs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr)); + return v; +} +static inline u16 rdgs16(addr_t addr) +{ + u16 v; + asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr)); + return v; +} +static inline u32 rdgs32(addr_t addr) +{ + u32 v; + asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr)); + return v; +} + +static inline void wrgs8(u8 v, addr_t addr) +{ + asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "r" (v)); +} +static inline void wrgs16(u16 v, addr_t addr) +{ + asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "r" (v)); +} +static inline void wrgs32(u32 v, addr_t addr) +{ + asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "r" (v)); +} + +/* Note: these only return true/false, not a signed return value! */ +static inline int memcmp(const void *s1, const void *s2, size_t len) +{ + u8 diff; + asm("repe; cmpsb; setnz %0" + : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); + return diff; +} + +static inline int memcmp_fs(const void *s1, addr_t s2, size_t len) +{ + u8 diff; + asm volatile("fs; repe; cmpsb; setnz %0" + : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); + return diff; +} +static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) +{ + u8 diff; + asm volatile("gs; repe; cmpsb; setnz %0" + : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len)); + return diff; +} + +static inline int isdigit(int ch) +{ + return (ch >= '0') && (ch <= '9'); +} + +/* Heap -- available for dynamic lists. */ +#define STACK_SIZE 512 /* Minimum number of bytes for stack */ + +extern char _end[]; +extern char *HEAP; +extern char *heap_end; +#define RESET_HEAP() ((void *)( HEAP = _end )) +static inline char *__get_heap(size_t s, size_t a, size_t n) +{ + char *tmp; + + HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1)); + tmp = HEAP; + HEAP += s*n; + return tmp; +} +#define GET_HEAP(type, n) \ + ((type *)__get_heap(sizeof(type),__alignof__(type),(n))) + +static inline int heap_free(void) +{ + return heap_end-HEAP; +} + +/* copy.S */ + +void copy_to_fs(addr_t dst, void *src, size_t len); +void *copy_from_fs(void *dst, addr_t src, size_t len); +void copy_to_gs(addr_t dst, void *src, size_t len); +void *copy_from_gs(void *dst, addr_t src, size_t len); +void *memcpy(void *dst, void *src, size_t len); +void *memset(void *dst, int c, size_t len); + +#define memcpy(d,s,l) __builtin_memcpy(d,s,l) +#define memset(d,c,l) __builtin_memset(d,c,l) + +/* a20.c */ +int enable_a20(void); + +/* apm.c */ +int query_apm_bios(void); + +/* cmdline.c */ +int cmdline_find_option(const char *option, char *buffer, int bufsize); + +/* cpu.c, cpucheck.c */ +int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr); +int validate_cpu(void); + +/* edd.c */ +void query_edd(void); + +/* header.S */ +void __attribute__((noreturn)) die(void); + +/* mca.c */ +int query_mca(void); + +/* memory.c */ +int detect_memory(void); + +/* pm.c */ +void __attribute__((noreturn)) go_to_protected_mode(void); + +/* pmjump.S */ +void __attribute__((noreturn)) + protected_mode_jump(u32 entrypoint, u32 bootparams); + +/* printf.c */ +int sprintf(char *buf, const char *fmt, ...); +int vsprintf(char *buf, const char *fmt, va_list args); +int printf(const char *fmt, ...); + +/* string.c */ +int strcmp(const char *str1, const char *str2); +size_t strnlen(const char *s, size_t maxlen); +unsigned int atou(const char *s); + +/* tty.c */ +void puts(const char *); +void putchar(int); +int getchar(void); +void kbd_flush(void); +int getchar_timeout(void); + +/* video.c */ +void set_video(void); + +/* video-vesa.c */ +void vesa_store_edid(void); + +/* voyager.c */ +int query_voyager(void); + +#endif /* __ASSEMBLY__ */ + +#endif /* BOOT_BOOT_H */ diff --git a/arch/x86/boot/cmdline.c b/arch/x86/boot/cmdline.c new file mode 100644 index 00000000000..34bb778c435 --- /dev/null +++ b/arch/x86/boot/cmdline.c @@ -0,0 +1,97 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/cmdline.c + * + * Simple command-line parser for early boot. + */ + +#include "boot.h" + +static inline int myisspace(u8 c) +{ + return c <= ' '; /* Close enough approximation */ +} + +/* + * Find a non-boolean option, that is, "option=argument". In accordance + * with standard Linux practice, if this option is repeated, this returns + * the last instance on the command line. + * + * Returns the length of the argument (regardless of if it was + * truncated to fit in the buffer), or -1 on not found. + */ +int cmdline_find_option(const char *option, char *buffer, int bufsize) +{ + u32 cmdline_ptr = boot_params.hdr.cmd_line_ptr; + addr_t cptr; + char c; + int len = -1; + const char *opptr = NULL; + char *bufptr = buffer; + enum { + st_wordstart, /* Start of word/after whitespace */ + st_wordcmp, /* Comparing this word */ + st_wordskip, /* Miscompare, skip */ + st_bufcpy /* Copying this to buffer */ + } state = st_wordstart; + + if (!cmdline_ptr || cmdline_ptr >= 0x100000) + return -1; /* No command line, or inaccessible */ + + cptr = cmdline_ptr & 0xf; + set_fs(cmdline_ptr >> 4); + + while (cptr < 0x10000 && (c = rdfs8(cptr++))) { + switch (state) { + case st_wordstart: + if (myisspace(c)) + break; + + /* else */ + state = st_wordcmp; + opptr = option; + /* fall through */ + + case st_wordcmp: + if (c == '=' && !*opptr) { + len = 0; + bufptr = buffer; + state = st_bufcpy; + } else if (myisspace(c)) { + state = st_wordstart; + } else if (c != *opptr++) { + state = st_wordskip; + } + break; + + case st_wordskip: + if (myisspace(c)) + state = st_wordstart; + break; + + case st_bufcpy: + if (myisspace(c)) { + state = st_wordstart; + } else { + if (len < bufsize-1) + *bufptr++ = c; + len++; + } + break; + } + } + + if (bufsize) + *bufptr = '\0'; + + return len; +} diff --git a/arch/x86/boot/code16gcc.h b/arch/x86/boot/code16gcc.h new file mode 100644 index 00000000000..d93e48010b6 --- /dev/null +++ b/arch/x86/boot/code16gcc.h @@ -0,0 +1,15 @@ +/* + * code16gcc.h + * + * This file is -include'd when compiling 16-bit C code. + * Note: this asm() needs to be emitted before gcc emits any code. + * Depending on gcc version, this requires -fno-unit-at-a-time or + * -fno-toplevel-reorder. + * + * Hopefully gcc will eventually have a real -m16 option so we can + * drop this hack long term. + */ + +#ifndef __ASSEMBLY__ +asm(".code16gcc"); +#endif diff --git a/arch/x86/boot/compressed/.gitignore b/arch/x86/boot/compressed/.gitignore new file mode 100644 index 00000000000..be0ed065249 --- /dev/null +++ b/arch/x86/boot/compressed/.gitignore @@ -0,0 +1 @@ +relocs diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile new file mode 100644 index 00000000000..52c1db85452 --- /dev/null +++ b/arch/x86/boot/compressed/Makefile @@ -0,0 +1,5 @@ +ifeq ($(CONFIG_X86_32),y) +include ${srctree}/arch/x86/boot/compressed/Makefile_32 +else +include ${srctree}/arch/x86/boot/compressed/Makefile_64 +endif diff --git a/arch/x86/boot/compressed/Makefile_32 b/arch/x86/boot/compressed/Makefile_32 new file mode 100644 index 00000000000..22613c652d2 --- /dev/null +++ b/arch/x86/boot/compressed/Makefile_32 @@ -0,0 +1,50 @@ +# +# linux/arch/x86/boot/compressed/Makefile +# +# create a compressed vmlinux image from the original vmlinux +# + +targets := vmlinux vmlinux.bin vmlinux.bin.gz head_32.o misc_32.o piggy.o \ + vmlinux.bin.all vmlinux.relocs +EXTRA_AFLAGS := -traditional + +LDFLAGS_vmlinux := -T +hostprogs-y := relocs + +CFLAGS := -m32 -D__KERNEL__ $(LINUX_INCLUDE) -O2 \ + -fno-strict-aliasing -fPIC \ + $(call cc-option,-ffreestanding) \ + $(call cc-option,-fno-stack-protector) +LDFLAGS := -m elf_i386 + +$(obj)/vmlinux: $(src)/vmlinux_32.lds $(obj)/head_32.o $(obj)/misc_32.o $(obj)/piggy.o FORCE + $(call if_changed,ld) + @: + +$(obj)/vmlinux.bin: vmlinux FORCE + $(call if_changed,objcopy) + +quiet_cmd_relocs = RELOCS $@ + cmd_relocs = $(obj)/relocs $< > $@;$(obj)/relocs --abs-relocs $< +$(obj)/vmlinux.relocs: vmlinux $(obj)/relocs FORCE + $(call if_changed,relocs) + +vmlinux.bin.all-y := $(obj)/vmlinux.bin +vmlinux.bin.all-$(CONFIG_RELOCATABLE) += $(obj)/vmlinux.relocs +quiet_cmd_relocbin = BUILD $@ + cmd_relocbin = cat $(filter-out FORCE,$^) > $@ +$(obj)/vmlinux.bin.all: $(vmlinux.bin.all-y) FORCE + $(call if_changed,relocbin) + +ifdef CONFIG_RELOCATABLE +$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin.all FORCE + $(call if_changed,gzip) +else +$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE + $(call if_changed,gzip) +endif + +LDFLAGS_piggy.o := -r --format binary --oformat elf32-i386 -T + +$(obj)/piggy.o: $(src)/vmlinux_32.scr $(obj)/vmlinux.bin.gz FORCE + $(call if_changed,ld) diff --git a/arch/x86/boot/compressed/Makefile_64 b/arch/x86/boot/compressed/Makefile_64 new file mode 100644 index 00000000000..dc6b3380cc4 --- /dev/null +++ b/arch/x86/boot/compressed/Makefile_64 @@ -0,0 +1,30 @@ +# +# linux/arch/x86/boot/compressed/Makefile +# +# create a compressed vmlinux image from the original vmlinux +# + +targets := vmlinux vmlinux.bin vmlinux.bin.gz head_64.o misc_64.o piggy.o + +CFLAGS := -m64 -D__KERNEL__ $(LINUXINCLUDE) -O2 \ + -fno-strict-aliasing -fPIC -mcmodel=small \ + $(call cc-option, -ffreestanding) \ + $(call cc-option, -fno-stack-protector) +AFLAGS := $(CFLAGS) -D__ASSEMBLY__ +LDFLAGS := -m elf_x86_64 + +LDFLAGS_vmlinux := -T +$(obj)/vmlinux: $(src)/vmlinux_64.lds $(obj)/head_64.o $(obj)/misc_64.o $(obj)/piggy.o FORCE + $(call if_changed,ld) + @: + +$(obj)/vmlinux.bin: vmlinux FORCE + $(call if_changed,objcopy) + +$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE + $(call if_changed,gzip) + +LDFLAGS_piggy.o := -r --format binary --oformat elf64-x86-64 -T + +$(obj)/piggy.o: $(obj)/vmlinux_64.scr $(obj)/vmlinux.bin.gz FORCE + $(call if_changed,ld) diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S new file mode 100644 index 00000000000..f35ea223752 --- /dev/null +++ b/arch/x86/boot/compressed/head_32.S @@ -0,0 +1,180 @@ +/* + * linux/boot/head.S + * + * Copyright (C) 1991, 1992, 1993 Linus Torvalds + */ + +/* + * head.S contains the 32-bit startup code. + * + * NOTE!!! Startup happens at absolute address 0x00001000, which is also where + * the page directory will exist. The startup code will be overwritten by + * the page directory. [According to comments etc elsewhere on a compressed + * kernel it will end up at 0x1000 + 1Mb I hope so as I assume this. - AC] + * + * Page 0 is deliberately kept safe, since System Management Mode code in + * laptops may need to access the BIOS data stored there. This is also + * useful for future device drivers that either access the BIOS via VM86 + * mode. + */ + +/* + * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 + */ +.text + +#include <linux/linkage.h> +#include <asm/segment.h> +#include <asm/page.h> +#include <asm/boot.h> + +.section ".text.head","ax",@progbits + .globl startup_32 + +startup_32: + cld + cli + movl $(__BOOT_DS),%eax + movl %eax,%ds + movl %eax,%es + movl %eax,%fs + movl %eax,%gs + movl %eax,%ss + +/* Calculate the delta between where we were compiled to run + * at and where we were actually loaded at. This can only be done + * with a short local call on x86. Nothing else will tell us what + * address we are running at. The reserved chunk of the real-mode + * data at 0x1e4 (defined as a scratch field) are used as the stack + * for this calculation. Only 4 bytes are needed. + */ + leal (0x1e4+4)(%esi), %esp + call 1f +1: popl %ebp + subl $1b, %ebp + +/* %ebp contains the address we are loaded at by the boot loader and %ebx + * contains the address where we should move the kernel image temporarily + * for safe in-place decompression. + */ + +#ifdef CONFIG_RELOCATABLE + movl %ebp, %ebx + addl $(CONFIG_PHYSICAL_ALIGN - 1), %ebx + andl $(~(CONFIG_PHYSICAL_ALIGN - 1)), %ebx +#else + movl $LOAD_PHYSICAL_ADDR, %ebx +#endif + + /* Replace the compressed data size with the uncompressed size */ + subl input_len(%ebp), %ebx + movl output_len(%ebp), %eax + addl %eax, %ebx + /* Add 8 bytes for every 32K input block */ + shrl $12, %eax + addl %eax, %ebx + /* Add 32K + 18 bytes of extra slack */ + addl $(32768 + 18), %ebx + /* Align on a 4K boundary */ + addl $4095, %ebx + andl $~4095, %ebx + +/* Copy the compressed kernel to the end of our buffer + * where decompression in place becomes safe. + */ + pushl %esi + leal _end(%ebp), %esi + leal _end(%ebx), %edi + movl $(_end - startup_32), %ecx + std + rep + movsb + cld + popl %esi + +/* Compute the kernel start address. + */ +#ifdef CONFIG_RELOCATABLE + addl $(CONFIG_PHYSICAL_ALIGN - 1), %ebp + andl $(~(CONFIG_PHYSICAL_ALIGN - 1)), %ebp +#else + movl $LOAD_PHYSICAL_ADDR, %ebp +#endif + +/* + * Jump to the relocated address. + */ + leal relocated(%ebx), %eax + jmp *%eax +.section ".text" +relocated: + +/* + * Clear BSS + */ + xorl %eax,%eax + leal _edata(%ebx),%edi + leal _end(%ebx), %ecx + subl %edi,%ecx + cld + rep + stosb + +/* + * Setup the stack for the decompressor + */ + leal stack_end(%ebx), %esp + +/* + * Do the decompression, and jump to the new kernel.. + */ + movl output_len(%ebx), %eax + pushl %eax + pushl %ebp # output address + movl input_len(%ebx), %eax + pushl %eax # input_len + leal input_data(%ebx), %eax + pushl %eax # input_data + leal _end(%ebx), %eax + pushl %eax # end of the image as third argument + pushl %esi # real mode pointer as second arg + call decompress_kernel + addl $20, %esp + popl %ecx + +#if CONFIG_RELOCATABLE +/* Find the address of the relocations. + */ + movl %ebp, %edi + addl %ecx, %edi + +/* Calculate the delta between where vmlinux was compiled to run + * and where it was actually loaded. + */ + movl %ebp, %ebx + subl $LOAD_PHYSICAL_ADDR, %ebx + jz 2f /* Nothing to be done if loaded at compiled addr. */ +/* + * Process relocations. + */ + +1: subl $4, %edi + movl 0(%edi), %ecx + testl %ecx, %ecx + jz 2f + addl %ebx, -__PAGE_OFFSET(%ebx, %ecx) + jmp 1b +2: +#endif + +/* + * Jump to the decompressed kernel. + */ + xorl %ebx,%ebx + jmp *%ebp + +.bss +.balign 4 +stack: + .fill 4096, 1, 0 +stack_end: diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S new file mode 100644 index 00000000000..49467640751 --- /dev/null +++ b/arch/x86/boot/compressed/head_64.S @@ -0,0 +1,311 @@ +/* + * linux/boot/head.S + * + * Copyright (C) 1991, 1992, 1993 Linus Torvalds + */ + +/* + * head.S contains the 32-bit startup code. + * + * NOTE!!! Startup happens at absolute address 0x00001000, which is also where + * the page directory will exist. The startup code will be overwritten by + * the page directory. [According to comments etc elsewhere on a compressed + * kernel it will end up at 0x1000 + 1Mb I hope so as I assume this. - AC] + * + * Page 0 is deliberately kept safe, since System Management Mode code in + * laptops may need to access the BIOS data stored there. This is also + * useful for future device drivers that either access the BIOS via VM86 + * mode. + */ + +/* + * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 + */ +.code32 +.text + +#include <linux/linkage.h> +#include <asm/segment.h> +#include <asm/pgtable.h> +#include <asm/page.h> +#include <asm/msr.h> + +.section ".text.head" + .code32 + .globl startup_32 + +startup_32: + cld + cli + movl $(__KERNEL_DS), %eax + movl %eax, %ds + movl %eax, %es + movl %eax, %ss + +/* Calculate the delta between where we were compiled to run + * at and where we were actually loaded at. This can only be done + * with a short local call on x86. Nothing else will tell us what + * address we are running at. The reserved chunk of the real-mode + * data at 0x1e4 (defined as a scratch field) are used as the stack + * for this calculation. Only 4 bytes are needed. + */ + leal (0x1e4+4)(%esi), %esp + call 1f +1: popl %ebp + subl $1b, %ebp + +/* setup a stack and make sure cpu supports long mode. */ + movl $user_stack_end, %eax + addl %ebp, %eax + movl %eax, %esp + + call verify_cpu + testl %eax, %eax + jnz no_longmode + +/* Compute the delta between where we were compiled to run at + * and where the code will actually run at. + */ +/* %ebp contains the address we are loaded at by the boot loader and %ebx + * contains the address where we should move the kernel image temporarily + * for safe in-place decompression. + */ + +#ifdef CONFIG_RELOCATABLE + movl %ebp, %ebx + addl $(LARGE_PAGE_SIZE -1), %ebx + andl $LARGE_PAGE_MASK, %ebx +#else + movl $CONFIG_PHYSICAL_START, %ebx +#endif + + /* Replace the compressed data size with the uncompressed size */ + subl input_len(%ebp), %ebx + movl output_len(%ebp), %eax + addl %eax, %ebx + /* Add 8 bytes for every 32K input block */ + shrl $12, %eax + addl %eax, %ebx + /* Add 32K + 18 bytes of extra slack and align on a 4K boundary */ + addl $(32768 + 18 + 4095), %ebx + andl $~4095, %ebx + +/* + * Prepare for entering 64 bit mode + */ + + /* Load new GDT with the 64bit segments using 32bit descriptor */ + leal gdt(%ebp), %eax + movl %eax, gdt+2(%ebp) + lgdt gdt(%ebp) + + /* Enable PAE mode */ + xorl %eax, %eax + orl $(1 << 5), %eax + movl %eax, %cr4 + + /* + * Build early 4G boot pagetable + */ + /* Initialize Page tables to 0*/ + leal pgtable(%ebx), %edi + xorl %eax, %eax + movl $((4096*6)/4), %ecx + rep stosl + + /* Build Level 4 */ + leal pgtable + 0(%ebx), %edi + leal 0x1007 (%edi), %eax + movl %eax, 0(%edi) + + /* Build Level 3 */ + leal pgtable + 0x1000(%ebx), %edi + leal 0x1007(%edi), %eax + movl $4, %ecx +1: movl %eax, 0x00(%edi) + addl $0x00001000, %eax + addl $8, %edi + decl %ecx + jnz 1b + + /* Build Level 2 */ + leal pgtable + 0x2000(%ebx), %edi + movl $0x00000183, %eax + movl $2048, %ecx +1: movl %eax, 0(%edi) + addl $0x00200000, %eax + addl $8, %edi + decl %ecx + jnz 1b + + /* Enable the boot page tables */ + leal pgtable(%ebx), %eax + movl %eax, %cr3 + + /* Enable Long mode in EFER (Extended Feature Enable Register) */ + movl $MSR_EFER, %ecx + rdmsr + btsl $_EFER_LME, %eax + wrmsr + + /* Setup for the jump to 64bit mode + * + * When the jump is performend we will be in long mode but + * in 32bit compatibility mode with EFER.LME = 1, CS.L = 0, CS.D = 1 + * (and in turn EFER.LMA = 1). To jump into 64bit mode we use + * the new gdt/idt that has __KERNEL_CS with CS.L = 1. + * We place all of the values on our mini stack so lret can + * used to perform that far jump. + */ + pushl $__KERNEL_CS + leal startup_64(%ebp), %eax + pushl %eax + + /* Enter paged protected Mode, activating Long Mode */ + movl $0x80000001, %eax /* Enable Paging and Protected mode */ + movl %eax, %cr0 + + /* Jump from 32bit compatibility mode into 64bit mode. */ + lret + +no_longmode: + /* This isn't an x86-64 CPU so hang */ +1: + hlt + jmp 1b + +#include "../../kernel/verify_cpu_64.S" + + /* Be careful here startup_64 needs to be at a predictable + * address so I can export it in an ELF header. Bootloaders + * should look at the ELF header to find this address, as + * it may change in the future. + */ + .code64 + .org 0x200 +ENTRY(startup_64) + /* We come here either from startup_32 or directly from a + * 64bit bootloader. If we come here from a bootloader we depend on + * an identity mapped page table being provied that maps our + * entire text+data+bss and hopefully all of memory. + */ + + /* Setup data segments. */ + xorl %eax, %eax + movl %eax, %ds + movl %eax, %es + movl %eax, %ss + movl %eax, %fs + movl %eax, %gs + lldt %ax + movl $0x20, %eax + ltr %ax + + /* Compute the decompressed kernel start address. It is where + * we were loaded at aligned to a 2M boundary. %rbp contains the + * decompressed kernel start address. + * + * If it is a relocatable kernel then decompress and run the kernel + * from load address aligned to 2MB addr, otherwise decompress and + * run the kernel from CONFIG_PHYSICAL_START + */ + + /* Start with the delta to where the kernel will run at. */ +#ifdef CONFIG_RELOCATABLE + leaq startup_32(%rip) /* - $startup_32 */, %rbp + addq $(LARGE_PAGE_SIZE - 1), %rbp + andq $LARGE_PAGE_MASK, %rbp + movq %rbp, %rbx +#else + movq $CONFIG_PHYSICAL_START, %rbp + movq %rbp, %rbx +#endif + + /* Replace the compressed data size with the uncompressed size */ + movl input_len(%rip), %eax + subq %rax, %rbx + movl output_len(%rip), %eax + addq %rax, %rbx + /* Add 8 bytes for every 32K input block */ + shrq $12, %rax + addq %rax, %rbx + /* Add 32K + 18 bytes of extra slack and align on a 4K boundary */ + addq $(32768 + 18 + 4095), %rbx + andq $~4095, %rbx + +/* Copy the compressed kernel to the end of our buffer + * where decompression in place becomes safe. + */ + leaq _end(%rip), %r8 + leaq _end(%rbx), %r9 + movq $_end /* - $startup_32 */, %rcx +1: subq $8, %r8 + subq $8, %r9 + movq 0(%r8), %rax + movq %rax, 0(%r9) + subq $8, %rcx + jnz 1b + +/* + * Jump to the relocated address. + */ + leaq relocated(%rbx), %rax + jmp *%rax + +.section ".text" +relocated: + +/* + * Clear BSS + */ + xorq %rax, %rax + leaq _edata(%rbx), %rdi + leaq _end(%rbx), %rcx + subq %rdi, %rcx + cld + rep + stosb + + /* Setup the stack */ + leaq user_stack_end(%rip), %rsp + + /* zero EFLAGS after setting rsp */ + pushq $0 + popfq + +/* + * Do the decompression, and jump to the new kernel.. + */ + pushq %rsi # Save the real mode argument + movq %rsi, %rdi # real mode address + leaq _heap(%rip), %rsi # _heap + leaq input_data(%rip), %rdx # input_data + movl input_len(%rip), %eax + movq %rax, %rcx # input_len + movq %rbp, %r8 # output + call decompress_kernel + popq %rsi + + +/* + * Jump to the decompressed kernel. + */ + jmp *%rbp + + .data +gdt: + .word gdt_end - gdt + .long gdt + .word 0 + .quad 0x0000000000000000 /* NULL descriptor */ + .quad 0x00af9a000000ffff /* __KERNEL_CS */ + .quad 0x00cf92000000ffff /* __KERNEL_DS */ + .quad 0x0080890000000000 /* TS descriptor */ + .quad 0x0000000000000000 /* TS continued */ +gdt_end: + .bss +/* Stack for uncompression */ + .balign 4 +user_stack: + .fill 4096,4,0 +user_stack_end: diff --git a/arch/x86/boot/compressed/misc_32.c b/arch/x86/boot/compressed/misc_32.c new file mode 100644 index 00000000000..b28505c544c --- /dev/null +++ b/arch/x86/boot/compressed/misc_32.c @@ -0,0 +1,379 @@ +/* + * misc.c + * + * This is a collection of several routines from gzip-1.0.3 + * adapted for Linux. + * + * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994 + * puts by Nick Holloway 1993, better puts by Martin Mares 1995 + * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 + */ + +#undef CONFIG_PARAVIRT +#include <linux/linkage.h> +#include <linux/vmalloc.h> +#include <linux/screen_info.h> +#include <asm/io.h> +#include <asm/page.h> +#include <asm/boot.h> + +/* WARNING!! + * This code is compiled with -fPIC and it is relocated dynamically + * at run time, but no relocation processing is performed. + * This means that it is not safe to place pointers in static structures. + */ + +/* + * Getting to provable safe in place decompression is hard. + * Worst case behaviours need to be analized. + * Background information: + * + * The file layout is: + * magic[2] + * method[1] + * flags[1] + * timestamp[4] + * extraflags[1] + * os[1] + * compressed data blocks[N] + * crc[4] orig_len[4] + * + * resulting in 18 bytes of non compressed data overhead. + * + * Files divided into blocks + * 1 bit (last block flag) + * 2 bits (block type) + * + * 1 block occurs every 32K -1 bytes or when there 50% compression has been achieved. + * The smallest block type encoding is always used. + * + * stored: + * 32 bits length in bytes. + * + * fixed: + * magic fixed tree. + * symbols. + * + * dynamic: + * dynamic tree encoding. + * symbols. + * + * + * The buffer for decompression in place is the length of the + * uncompressed data, plus a small amount extra to keep the algorithm safe. + * The compressed data is placed at the end of the buffer. The output + * pointer is placed at the start of the buffer and the input pointer + * is placed where the compressed data starts. Problems will occur + * when the output pointer overruns the input pointer. + * + * The output pointer can only overrun the input pointer if the input + * pointer is moving faster than the output pointer. A condition only + * triggered by data whose compressed form is larger than the uncompressed + * form. + * + * The worst case at the block level is a growth of the compressed data + * of 5 bytes per 32767 bytes. + * + * The worst case internal to a compressed block is very hard to figure. + * The worst case can at least be boundined by having one bit that represents + * 32764 bytes and then all of the rest of the bytes representing the very + * very last byte. + * + * All of which is enough to compute an amount of extra data that is required + * to be safe. To avoid problems at the block level allocating 5 extra bytes + * per 32767 bytes of data is sufficient. To avoind problems internal to a block + * adding an extra 32767 bytes (the worst case uncompressed block size) is + * sufficient, to ensure that in the worst case the decompressed data for + * block will stop the byte before the compressed data for a block begins. + * To avoid problems with the compressed data's meta information an extra 18 + * bytes are needed. Leading to the formula: + * + * extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size. + * + * Adding 8 bytes per 32K is a bit excessive but much easier to calculate. + * Adding 32768 instead of 32767 just makes for round numbers. + * Adding the decompressor_size is necessary as it musht live after all + * of the data as well. Last I measured the decompressor is about 14K. + * 10K of actuall data and 4K of bss. + * + */ + +/* + * gzip declarations + */ + +#define OF(args) args +#define STATIC static + +#undef memset +#undef memcpy +#define memzero(s, n) memset ((s), 0, (n)) + +typedef unsigned char uch; +typedef unsigned short ush; +typedef unsigned long ulg; + +#define WSIZE 0x80000000 /* Window size must be at least 32k, + * and a power of two + * We don't actually have a window just + * a huge output buffer so I report + * a 2G windows size, as that should + * always be larger than our output buffer. + */ + +static uch *inbuf; /* input buffer */ +static uch *window; /* Sliding window buffer, (and final output buffer) */ + +static unsigned insize; /* valid bytes in inbuf */ +static unsigned inptr; /* index of next byte to be processed in inbuf */ +static unsigned outcnt; /* bytes in output buffer */ + +/* gzip flag byte */ +#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ +#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ +#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ +#define ORIG_NAME 0x08 /* bit 3 set: original file name present */ +#define COMMENT 0x10 /* bit 4 set: file comment present */ +#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ +#define RESERVED 0xC0 /* bit 6,7: reserved */ + +#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) + +/* Diagnostic functions */ +#ifdef DEBUG +# define Assert(cond,msg) {if(!(cond)) error(msg);} +# define Trace(x) fprintf x +# define Tracev(x) {if (verbose) fprintf x ;} +# define Tracevv(x) {if (verbose>1) fprintf x ;} +# define Tracec(c,x) {if (verbose && (c)) fprintf x ;} +# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;} +#else +# define Assert(cond,msg) +# define Trace(x) +# define Tracev(x) +# define Tracevv(x) +# define Tracec(c,x) +# define Tracecv(c,x) +#endif + +static int fill_inbuf(void); +static void flush_window(void); +static void error(char *m); +static void gzip_mark(void **); +static void gzip_release(void **); + +/* + * This is set up by the setup-routine at boot-time + */ +static unsigned char *real_mode; /* Pointer to real-mode data */ + +#define RM_EXT_MEM_K (*(unsigned short *)(real_mode + 0x2)) +#ifndef STANDARD_MEMORY_BIOS_CALL +#define RM_ALT_MEM_K (*(unsigned long *)(real_mode + 0x1e0)) +#endif +#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0)) + +extern unsigned char input_data[]; +extern int input_len; + +static long bytes_out = 0; + +static void *malloc(int size); +static void free(void *where); + +static void *memset(void *s, int c, unsigned n); +static void *memcpy(void *dest, const void *src, unsigned n); + +static void putstr(const char *); + +static unsigned long free_mem_ptr; +static unsigned long free_mem_end_ptr; + +#define HEAP_SIZE 0x4000 + +static char *vidmem = (char *)0xb8000; +static int vidport; +static int lines, cols; + +#ifdef CONFIG_X86_NUMAQ +void *xquad_portio; +#endif + +#include "../../../../lib/inflate.c" + +static void *malloc(int size) +{ + void *p; + + if (size <0) error("Malloc error"); + if (free_mem_ptr <= 0) error("Memory error"); + + free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */ + + p = (void *)free_mem_ptr; + free_mem_ptr += size; + + if (free_mem_ptr >= free_mem_end_ptr) + error("Out of memory"); + + return p; +} + +static void free(void *where) +{ /* Don't care */ +} + +static void gzip_mark(void **ptr) +{ + *ptr = (void *) free_mem_ptr; +} + +static void gzip_release(void **ptr) +{ + free_mem_ptr = (unsigned long) *ptr; +} + +static void scroll(void) +{ + int i; + + memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 ); + for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 ) + vidmem[i] = ' '; +} + +static void putstr(const char *s) +{ + int x,y,pos; + char c; + + x = RM_SCREEN_INFO.orig_x; + y = RM_SCREEN_INFO.orig_y; + + while ( ( c = *s++ ) != '\0' ) { + if ( c == '\n' ) { + x = 0; + if ( ++y >= lines ) { + scroll(); + y--; + } + } else { + vidmem [ ( x + cols * y ) * 2 ] = c; + if ( ++x >= cols ) { + x = 0; + if ( ++y >= lines ) { + scroll(); + y--; + } + } + } + } + + RM_SCREEN_INFO.orig_x = x; + RM_SCREEN_INFO.orig_y = y; + + pos = (x + cols * y) * 2; /* Update cursor position */ + outb_p(14, vidport); + outb_p(0xff & (pos >> 9), vidport+1); + outb_p(15, vidport); + outb_p(0xff & (pos >> 1), vidport+1); +} + +static void* memset(void* s, int c, unsigned n) +{ + int i; + char *ss = (char*)s; + + for (i=0;i<n;i++) ss[i] = c; + return s; +} + +static void* memcpy(void* dest, const void* src, unsigned n) +{ + int i; + char *d = (char *)dest, *s = (char *)src; + + for (i=0;i<n;i++) d[i] = s[i]; + return dest; +} + +/* =========================================================================== + * Fill the input buffer. This is called only when the buffer is empty + * and at least one byte is really needed. + */ +static int fill_inbuf(void) +{ + error("ran out of input data"); + return 0; +} + +/* =========================================================================== + * Write the output window window[0..outcnt-1] and update crc and bytes_out. + * (Used for the decompressed data only.) + */ +static void flush_window(void) +{ + /* With my window equal to my output buffer + * I only need to compute the crc here. + */ + ulg c = crc; /* temporary variable */ + unsigned n; + uch *in, ch; + + in = window; + for (n = 0; n < outcnt; n++) { + ch = *in++; + c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); + } + crc = c; + bytes_out += (ulg)outcnt; + outcnt = 0; +} + +static void error(char *x) +{ + putstr("\n\n"); + putstr(x); + putstr("\n\n -- System halted"); + + while(1); /* Halt */ +} + +asmlinkage void decompress_kernel(void *rmode, unsigned long end, + uch *input_data, unsigned long input_len, uch *output) +{ + real_mode = rmode; + + if (RM_SCREEN_INFO.orig_video_mode == 7) { + vidmem = (char *) 0xb0000; + vidport = 0x3b4; + } else { + vidmem = (char *) 0xb8000; + vidport = 0x3d4; + } + + lines = RM_SCREEN_INFO.orig_video_lines; + cols = RM_SCREEN_INFO.orig_video_cols; + + window = output; /* Output buffer (Normally at 1M) */ + free_mem_ptr = end; /* Heap */ + free_mem_end_ptr = end + HEAP_SIZE; + inbuf = input_data; /* Input buffer */ + insize = input_len; + inptr = 0; + + if ((u32)output & (CONFIG_PHYSICAL_ALIGN -1)) + error("Destination address not CONFIG_PHYSICAL_ALIGN aligned"); + if (end > ((-__PAGE_OFFSET-(512 <<20)-1) & 0x7fffffff)) + error("Destination address too large"); +#ifndef CONFIG_RELOCATABLE + if ((u32)output != LOAD_PHYSICAL_ADDR) + error("Wrong destination address"); +#endif + + makecrc(); + putstr("Uncompressing Linux... "); + gunzip(); + putstr("Ok, booting the kernel.\n"); + return; +} diff --git a/arch/x86/boot/compressed/misc_64.c b/arch/x86/boot/compressed/misc_64.c new file mode 100644 index 00000000000..f932b0e8909 --- /dev/null +++ b/arch/x86/boot/compressed/misc_64.c @@ -0,0 +1,371 @@ +/* + * misc.c + * + * This is a collection of several routines from gzip-1.0.3 + * adapted for Linux. + * + * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994 + * puts by Nick Holloway 1993, better puts by Martin Mares 1995 + * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 + */ + +#define _LINUX_STRING_H_ 1 +#define __LINUX_BITMAP_H 1 + +#include <linux/linkage.h> +#include <linux/screen_info.h> +#include <asm/io.h> +#include <asm/page.h> + +/* WARNING!! + * This code is compiled with -fPIC and it is relocated dynamically + * at run time, but no relocation processing is performed. + * This means that it is not safe to place pointers in static structures. + */ + +/* + * Getting to provable safe in place decompression is hard. + * Worst case behaviours need to be analized. + * Background information: + * + * The file layout is: + * magic[2] + * method[1] + * flags[1] + * timestamp[4] + * extraflags[1] + * os[1] + * compressed data blocks[N] + * crc[4] orig_len[4] + * + * resulting in 18 bytes of non compressed data overhead. + * + * Files divided into blocks + * 1 bit (last block flag) + * 2 bits (block type) + * + * 1 block occurs every 32K -1 bytes or when there 50% compression has been achieved. + * The smallest block type encoding is always used. + * + * stored: + * 32 bits length in bytes. + * + * fixed: + * magic fixed tree. + * symbols. + * + * dynamic: + * dynamic tree encoding. + * symbols. + * + * + * The buffer for decompression in place is the length of the + * uncompressed data, plus a small amount extra to keep the algorithm safe. + * The compressed data is placed at the end of the buffer. The output + * pointer is placed at the start of the buffer and the input pointer + * is placed where the compressed data starts. Problems will occur + * when the output pointer overruns the input pointer. + * + * The output pointer can only overrun the input pointer if the input + * pointer is moving faster than the output pointer. A condition only + * triggered by data whose compressed form is larger than the uncompressed + * form. + * + * The worst case at the block level is a growth of the compressed data + * of 5 bytes per 32767 bytes. + * + * The worst case internal to a compressed block is very hard to figure. + * The worst case can at least be boundined by having one bit that represents + * 32764 bytes and then all of the rest of the bytes representing the very + * very last byte. + * + * All of which is enough to compute an amount of extra data that is required + * to be safe. To avoid problems at the block level allocating 5 extra bytes + * per 32767 bytes of data is sufficient. To avoind problems internal to a block + * adding an extra 32767 bytes (the worst case uncompressed block size) is + * sufficient, to ensure that in the worst case the decompressed data for + * block will stop the byte before the compressed data for a block begins. + * To avoid problems with the compressed data's meta information an extra 18 + * bytes are needed. Leading to the formula: + * + * extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size. + * + * Adding 8 bytes per 32K is a bit excessive but much easier to calculate. + * Adding 32768 instead of 32767 just makes for round numbers. + * Adding the decompressor_size is necessary as it musht live after all + * of the data as well. Last I measured the decompressor is about 14K. + * 10K of actuall data and 4K of bss. + * + */ + +/* + * gzip declarations + */ + +#define OF(args) args +#define STATIC static + +#undef memset +#undef memcpy +#define memzero(s, n) memset ((s), 0, (n)) + +typedef unsigned char uch; +typedef unsigned short ush; +typedef unsigned long ulg; + +#define WSIZE 0x80000000 /* Window size must be at least 32k, + * and a power of two + * We don't actually have a window just + * a huge output buffer so I report + * a 2G windows size, as that should + * always be larger than our output buffer. + */ + +static uch *inbuf; /* input buffer */ +static uch *window; /* Sliding window buffer, (and final output buffer) */ + +static unsigned insize; /* valid bytes in inbuf */ +static unsigned inptr; /* index of next byte to be processed in inbuf */ +static unsigned outcnt; /* bytes in output buffer */ + +/* gzip flag byte */ +#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ +#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ +#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ +#define ORIG_NAME 0x08 /* bit 3 set: original file name present */ +#define COMMENT 0x10 /* bit 4 set: file comment present */ +#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ +#define RESERVED 0xC0 /* bit 6,7: reserved */ + +#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) + +/* Diagnostic functions */ +#ifdef DEBUG +# define Assert(cond,msg) {if(!(cond)) error(msg);} +# define Trace(x) fprintf x +# define Tracev(x) {if (verbose) fprintf x ;} +# define Tracevv(x) {if (verbose>1) fprintf x ;} +# define Tracec(c,x) {if (verbose && (c)) fprintf x ;} +# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;} +#else +# define Assert(cond,msg) +# define Trace(x) +# define Tracev(x) +# define Tracevv(x) +# define Tracec(c,x) +# define Tracecv(c,x) +#endif + +static int fill_inbuf(void); +static void flush_window(void); +static void error(char *m); +static void gzip_mark(void **); +static void gzip_release(void **); + +/* + * This is set up by the setup-routine at boot-time + */ +static unsigned char *real_mode; /* Pointer to real-mode data */ + +#define RM_EXT_MEM_K (*(unsigned short *)(real_mode + 0x2)) +#ifndef STANDARD_MEMORY_BIOS_CALL +#define RM_ALT_MEM_K (*(unsigned long *)(real_mode + 0x1e0)) +#endif +#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0)) + +extern unsigned char input_data[]; +extern int input_len; + +static long bytes_out = 0; + +static void *malloc(int size); +static void free(void *where); + +static void *memset(void *s, int c, unsigned n); +static void *memcpy(void *dest, const void *src, unsigned n); + +static void putstr(const char *); + +static long free_mem_ptr; +static long free_mem_end_ptr; + +#define HEAP_SIZE 0x7000 + +static char *vidmem = (char *)0xb8000; +static int vidport; +static int lines, cols; + +#include "../../../../lib/inflate.c" + +static void *malloc(int size) +{ + void *p; + + if (size <0) error("Malloc error"); + if (free_mem_ptr <= 0) error("Memory error"); + + free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */ + + p = (void *)free_mem_ptr; + free_mem_ptr += size; + + if (free_mem_ptr >= free_mem_end_ptr) + error("Out of memory"); + + return p; +} + +static void free(void *where) +{ /* Don't care */ +} + +static void gzip_mark(void **ptr) +{ + *ptr = (void *) free_mem_ptr; +} + +static void gzip_release(void **ptr) +{ + free_mem_ptr = (long) *ptr; +} + +static void scroll(void) +{ + int i; + + memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 ); + for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 ) + vidmem[i] = ' '; +} + +static void putstr(const char *s) +{ + int x,y,pos; + char c; + + x = RM_SCREEN_INFO.orig_x; + y = RM_SCREEN_INFO.orig_y; + + while ( ( c = *s++ ) != '\0' ) { + if ( c == '\n' ) { + x = 0; + if ( ++y >= lines ) { + scroll(); + y--; + } + } else { + vidmem [ ( x + cols * y ) * 2 ] = c; + if ( ++x >= cols ) { + x = 0; + if ( ++y >= lines ) { + scroll(); + y--; + } + } + } + } + + RM_SCREEN_INFO.orig_x = x; + RM_SCREEN_INFO.orig_y = y; + + pos = (x + cols * y) * 2; /* Update cursor position */ + outb_p(14, vidport); + outb_p(0xff & (pos >> 9), vidport+1); + outb_p(15, vidport); + outb_p(0xff & (pos >> 1), vidport+1); +} + +static void* memset(void* s, int c, unsigned n) +{ + int i; + char *ss = (char*)s; + + for (i=0;i<n;i++) ss[i] = c; + return s; +} + +static void* memcpy(void* dest, const void* src, unsigned n) +{ + int i; + char *d = (char *)dest, *s = (char *)src; + + for (i=0;i<n;i++) d[i] = s[i]; + return dest; +} + +/* =========================================================================== + * Fill the input buffer. This is called only when the buffer is empty + * and at least one byte is really needed. + */ +static int fill_inbuf(void) +{ + error("ran out of input data"); + return 0; +} + +/* =========================================================================== + * Write the output window window[0..outcnt-1] and update crc and bytes_out. + * (Used for the decompressed data only.) + */ +static void flush_window(void) +{ + /* With my window equal to my output buffer + * I only need to compute the crc here. + */ + ulg c = crc; /* temporary variable */ + unsigned n; + uch *in, ch; + + in = window; + for (n = 0; n < outcnt; n++) { + ch = *in++; + c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); + } + crc = c; + bytes_out += (ulg)outcnt; + outcnt = 0; +} + +static void error(char *x) +{ + putstr("\n\n"); + putstr(x); + putstr("\n\n -- System halted"); + + while(1); /* Halt */ +} + +asmlinkage void decompress_kernel(void *rmode, unsigned long heap, + uch *input_data, unsigned long input_len, uch *output) +{ + real_mode = rmode; + + if (RM_SCREEN_INFO.orig_video_mode == 7) { + vidmem = (char *) 0xb0000; + vidport = 0x3b4; + } else { + vidmem = (char *) 0xb8000; + vidport = 0x3d4; + } + + lines = RM_SCREEN_INFO.orig_video_lines; + cols = RM_SCREEN_INFO.orig_video_cols; + + window = output; /* Output buffer (Normally at 1M) */ + free_mem_ptr = heap; /* Heap */ + free_mem_end_ptr = heap + HEAP_SIZE; + inbuf = input_data; /* Input buffer */ + insize = input_len; + inptr = 0; + + if ((ulg)output & (__KERNEL_ALIGN - 1)) + error("Destination address not 2M aligned"); + if ((ulg)output >= 0xffffffffffUL) + error("Destination address too large"); + + makecrc(); + putstr(".\nDecompressing Linux..."); + gunzip(); + putstr("done.\nBooting the kernel.\n"); + return; +} diff --git a/arch/x86/boot/compressed/relocs.c b/arch/x86/boot/compressed/relocs.c new file mode 100644 index 00000000000..2d77ee728f9 --- /dev/null +++ b/arch/x86/boot/compressed/relocs.c @@ -0,0 +1,631 @@ +#include <stdio.h> +#include <stdarg.h> +#include <stdlib.h> +#include <stdint.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <elf.h> +#include <byteswap.h> +#define USE_BSD +#include <endian.h> + +#define MAX_SHDRS 100 +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) +static Elf32_Ehdr ehdr; +static Elf32_Shdr shdr[MAX_SHDRS]; +static Elf32_Sym *symtab[MAX_SHDRS]; +static Elf32_Rel *reltab[MAX_SHDRS]; +static char *strtab[MAX_SHDRS]; +static unsigned long reloc_count, reloc_idx; +static unsigned long *relocs; + +/* + * Following symbols have been audited. There values are constant and do + * not change if bzImage is loaded at a different physical address than + * the address for which it has been compiled. Don't warn user about + * absolute relocations present w.r.t these symbols. + */ +static const char* safe_abs_relocs[] = { + "__kernel_vsyscall", + "__kernel_rt_sigreturn", + "__kernel_sigreturn", + "SYSENTER_RETURN", + "VDSO_NOTE_MASK", + "xen_irq_disable_direct_reloc", + "xen_save_fl_direct_reloc", +}; + +static int is_safe_abs_reloc(const char* sym_name) +{ + int i, array_size; + + array_size = sizeof(safe_abs_relocs)/sizeof(char*); + + for(i = 0; i < array_size; i++) { + if (!strcmp(sym_name, safe_abs_relocs[i])) + /* Match found */ + return 1; + } + if (strncmp(sym_name, "__crc_", 6) == 0) + return 1; + return 0; +} + +static void die(char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + exit(1); +} + +static const char *sym_type(unsigned type) +{ + static const char *type_name[] = { +#define SYM_TYPE(X) [X] = #X + SYM_TYPE(STT_NOTYPE), + SYM_TYPE(STT_OBJECT), + SYM_TYPE(STT_FUNC), + SYM_TYPE(STT_SECTION), + SYM_TYPE(STT_FILE), + SYM_TYPE(STT_COMMON), + SYM_TYPE(STT_TLS), +#undef SYM_TYPE + }; + const char *name = "unknown sym type name"; + if (type < ARRAY_SIZE(type_name)) { + name = type_name[type]; + } + return name; +} + +static const char *sym_bind(unsigned bind) +{ + static const char *bind_name[] = { +#define SYM_BIND(X) [X] = #X + SYM_BIND(STB_LOCAL), + SYM_BIND(STB_GLOBAL), + SYM_BIND(STB_WEAK), +#undef SYM_BIND + }; + const char *name = "unknown sym bind name"; + if (bind < ARRAY_SIZE(bind_name)) { + name = bind_name[bind]; + } + return name; +} + +static const char *sym_visibility(unsigned visibility) +{ + static const char *visibility_name[] = { +#define SYM_VISIBILITY(X) [X] = #X + SYM_VISIBILITY(STV_DEFAULT), + SYM_VISIBILITY(STV_INTERNAL), + SYM_VISIBILITY(STV_HIDDEN), + SYM_VISIBILITY(STV_PROTECTED), +#undef SYM_VISIBILITY + }; + const char *name = "unknown sym visibility name"; + if (visibility < ARRAY_SIZE(visibility_name)) { + name = visibility_name[visibility]; + } + return name; +} + +static const char *rel_type(unsigned type) +{ + static const char *type_name[] = { +#define REL_TYPE(X) [X] = #X + REL_TYPE(R_386_NONE), + REL_TYPE(R_386_32), + REL_TYPE(R_386_PC32), + REL_TYPE(R_386_GOT32), + REL_TYPE(R_386_PLT32), + REL_TYPE(R_386_COPY), + REL_TYPE(R_386_GLOB_DAT), + REL_TYPE(R_386_JMP_SLOT), + REL_TYPE(R_386_RELATIVE), + REL_TYPE(R_386_GOTOFF), + REL_TYPE(R_386_GOTPC), +#undef REL_TYPE + }; + const char *name = "unknown type rel type name"; + if (type < ARRAY_SIZE(type_name)) { + name = type_name[type]; + } + return name; +} + +static const char *sec_name(unsigned shndx) +{ + const char *sec_strtab; + const char *name; + sec_strtab = strtab[ehdr.e_shstrndx]; + name = "<noname>"; + if (shndx < ehdr.e_shnum) { + name = sec_strtab + shdr[shndx].sh_name; + } + else if (shndx == SHN_ABS) { + name = "ABSOLUTE"; + } + else if (shndx == SHN_COMMON) { + name = "COMMON"; + } + return name; +} + +static const char *sym_name(const char *sym_strtab, Elf32_Sym *sym) +{ + const char *name; + name = "<noname>"; + if (sym->st_name) { + name = sym_strtab + sym->st_name; + } + else { + name = sec_name(shdr[sym->st_shndx].sh_name); + } + return name; +} + + + +#if BYTE_ORDER == LITTLE_ENDIAN +#define le16_to_cpu(val) (val) +#define le32_to_cpu(val) (val) +#endif +#if BYTE_ORDER == BIG_ENDIAN +#define le16_to_cpu(val) bswap_16(val) +#define le32_to_cpu(val) bswap_32(val) +#endif + +static uint16_t elf16_to_cpu(uint16_t val) +{ + return le16_to_cpu(val); +} + +static uint32_t elf32_to_cpu(uint32_t val) +{ + return le32_to_cpu(val); +} + +static void read_ehdr(FILE *fp) +{ + if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) { + die("Cannot read ELF header: %s\n", + strerror(errno)); + } + if (memcmp(ehdr.e_ident, ELFMAG, 4) != 0) { + die("No ELF magic\n"); + } + if (ehdr.e_ident[EI_CLASS] != ELFCLASS32) { + die("Not a 32 bit executable\n"); + } + if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) { + die("Not a LSB ELF executable\n"); + } + if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) { + die("Unknown ELF version\n"); + } + /* Convert the fields to native endian */ + ehdr.e_type = elf16_to_cpu(ehdr.e_type); + ehdr.e_machine = elf16_to_cpu(ehdr.e_machine); + ehdr.e_version = elf32_to_cpu(ehdr.e_version); + ehdr.e_entry = elf32_to_cpu(ehdr.e_entry); + ehdr.e_phoff = elf32_to_cpu(ehdr.e_phoff); + ehdr.e_shoff = elf32_to_cpu(ehdr.e_shoff); + ehdr.e_flags = elf32_to_cpu(ehdr.e_flags); + ehdr.e_ehsize = elf16_to_cpu(ehdr.e_ehsize); + ehdr.e_phentsize = elf16_to_cpu(ehdr.e_phentsize); + ehdr.e_phnum = elf16_to_cpu(ehdr.e_phnum); + ehdr.e_shentsize = elf16_to_cpu(ehdr.e_shentsize); + ehdr.e_shnum = elf16_to_cpu(ehdr.e_shnum); + ehdr.e_shstrndx = elf16_to_cpu(ehdr.e_shstrndx); + + if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) { + die("Unsupported ELF header type\n"); + } + if (ehdr.e_machine != EM_386) { + die("Not for x86\n"); + } + if (ehdr.e_version != EV_CURRENT) { + die("Unknown ELF version\n"); + } + if (ehdr.e_ehsize != sizeof(Elf32_Ehdr)) { + die("Bad Elf header size\n"); + } + if (ehdr.e_phentsize != sizeof(Elf32_Phdr)) { + die("Bad program header entry\n"); + } + if (ehdr.e_shentsize != sizeof(Elf32_Shdr)) { + die("Bad section header entry\n"); + } + if (ehdr.e_shstrndx >= ehdr.e_shnum) { + die("String table index out of bounds\n"); + } +} + +static void read_shdrs(FILE *fp) +{ + int i; + if (ehdr.e_shnum > MAX_SHDRS) { + die("%d section headers supported: %d\n", + ehdr.e_shnum, MAX_SHDRS); + } + if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) { + die("Seek to %d failed: %s\n", + ehdr.e_shoff, strerror(errno)); + } + if (fread(&shdr, sizeof(shdr[0]), ehdr.e_shnum, fp) != ehdr.e_shnum) { + die("Cannot read ELF section headers: %s\n", + strerror(errno)); + } + for(i = 0; i < ehdr.e_shnum; i++) { + shdr[i].sh_name = elf32_to_cpu(shdr[i].sh_name); + shdr[i].sh_type = elf32_to_cpu(shdr[i].sh_type); + shdr[i].sh_flags = elf32_to_cpu(shdr[i].sh_flags); + shdr[i].sh_addr = elf32_to_cpu(shdr[i].sh_addr); + shdr[i].sh_offset = elf32_to_cpu(shdr[i].sh_offset); + shdr[i].sh_size = elf32_to_cpu(shdr[i].sh_size); + shdr[i].sh_link = elf32_to_cpu(shdr[i].sh_link); + shdr[i].sh_info = elf32_to_cpu(shdr[i].sh_info); + shdr[i].sh_addralign = elf32_to_cpu(shdr[i].sh_addralign); + shdr[i].sh_entsize = elf32_to_cpu(shdr[i].sh_entsize); + } + +} + +static void read_strtabs(FILE *fp) +{ + int i; + for(i = 0; i < ehdr.e_shnum; i++) { + if (shdr[i].sh_type != SHT_STRTAB) { + continue; + } + strtab[i] = malloc(shdr[i].sh_size); + if (!strtab[i]) { + die("malloc of %d bytes for strtab failed\n", + shdr[i].sh_size); + } + if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) { + die("Seek to %d failed: %s\n", + shdr[i].sh_offset, strerror(errno)); + } + if (fread(strtab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) { + die("Cannot read symbol table: %s\n", + strerror(errno)); + } + } +} + +static void read_symtabs(FILE *fp) +{ + int i,j; + for(i = 0; i < ehdr.e_shnum; i++) { + if (shdr[i].sh_type != SHT_SYMTAB) { + continue; + } + symtab[i] = malloc(shdr[i].sh_size); + if (!symtab[i]) { + die("malloc of %d bytes for symtab failed\n", + shdr[i].sh_size); + } + if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) { + die("Seek to %d failed: %s\n", + shdr[i].sh_offset, strerror(errno)); + } + if (fread(symtab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) { + die("Cannot read symbol table: %s\n", + strerror(errno)); + } + for(j = 0; j < shdr[i].sh_size/sizeof(symtab[i][0]); j++) { + symtab[i][j].st_name = elf32_to_cpu(symtab[i][j].st_name); + symtab[i][j].st_value = elf32_to_cpu(symtab[i][j].st_value); + symtab[i][j].st_size = elf32_to_cpu(symtab[i][j].st_size); + symtab[i][j].st_shndx = elf16_to_cpu(symtab[i][j].st_shndx); + } + } +} + + +static void read_relocs(FILE *fp) +{ + int i,j; + for(i = 0; i < ehdr.e_shnum; i++) { + if (shdr[i].sh_type != SHT_REL) { + continue; + } + reltab[i] = malloc(shdr[i].sh_size); + if (!reltab[i]) { + die("malloc of %d bytes for relocs failed\n", + shdr[i].sh_size); + } + if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) { + die("Seek to %d failed: %s\n", + shdr[i].sh_offset, strerror(errno)); + } + if (fread(reltab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) { + die("Cannot read symbol table: %s\n", + strerror(errno)); + } + for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) { + reltab[i][j].r_offset = elf32_to_cpu(reltab[i][j].r_offset); + reltab[i][j].r_info = elf32_to_cpu(reltab[i][j].r_info); + } + } +} + + +static void print_absolute_symbols(void) +{ + int i; + printf("Absolute symbols\n"); + printf(" Num: Value Size Type Bind Visibility Name\n"); + for(i = 0; i < ehdr.e_shnum; i++) { + char *sym_strtab; + Elf32_Sym *sh_symtab; + int j; + if (shdr[i].sh_type != SHT_SYMTAB) { + continue; + } + sh_symtab = symtab[i]; + sym_strtab = strtab[shdr[i].sh_link]; + for(j = 0; j < shdr[i].sh_size/sizeof(symtab[0][0]); j++) { + Elf32_Sym *sym; + const char *name; + sym = &symtab[i][j]; + name = sym_name(sym_strtab, sym); + if (sym->st_shndx != SHN_ABS) { + continue; + } + printf("%5d %08x %5d %10s %10s %12s %s\n", + j, sym->st_value, sym->st_size, + sym_type(ELF32_ST_TYPE(sym->st_info)), + sym_bind(ELF32_ST_BIND(sym->st_info)), + sym_visibility(ELF32_ST_VISIBILITY(sym->st_other)), + name); + } + } + printf("\n"); +} + +static void print_absolute_relocs(void) +{ + int i, printed = 0; + + for(i = 0; i < ehdr.e_shnum; i++) { + char *sym_strtab; + Elf32_Sym *sh_symtab; + unsigned sec_applies, sec_symtab; + int j; + if (shdr[i].sh_type != SHT_REL) { + continue; + } + sec_symtab = shdr[i].sh_link; + sec_applies = shdr[i].sh_info; + if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) { + continue; + } + sh_symtab = symtab[sec_symtab]; + sym_strtab = strtab[shdr[sec_symtab].sh_link]; + for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) { + Elf32_Rel *rel; + Elf32_Sym *sym; + const char *name; + rel = &reltab[i][j]; + sym = &sh_symtab[ELF32_R_SYM(rel->r_info)]; + name = sym_name(sym_strtab, sym); + if (sym->st_shndx != SHN_ABS) { + continue; + } + + /* Absolute symbols are not relocated if bzImage is + * loaded at a non-compiled address. Display a warning + * to user at compile time about the absolute + * relocations present. + * + * User need to audit the code to make sure + * some symbols which should have been section + * relative have not become absolute because of some + * linker optimization or wrong programming usage. + * + * Before warning check if this absolute symbol + * relocation is harmless. + */ + if (is_safe_abs_reloc(name)) + continue; + + if (!printed) { + printf("WARNING: Absolute relocations" + " present\n"); + printf("Offset Info Type Sym.Value " + "Sym.Name\n"); + printed = 1; + } + + printf("%08x %08x %10s %08x %s\n", + rel->r_offset, + rel->r_info, + rel_type(ELF32_R_TYPE(rel->r_info)), + sym->st_value, + name); + } + } + + if (printed) + printf("\n"); +} + +static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym)) +{ + int i; + /* Walk through the relocations */ + for(i = 0; i < ehdr.e_shnum; i++) { + char *sym_strtab; + Elf32_Sym *sh_symtab; + unsigned sec_applies, sec_symtab; + int j; + if (shdr[i].sh_type != SHT_REL) { + continue; + } + sec_symtab = shdr[i].sh_link; + sec_applies = shdr[i].sh_info; + if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) { + continue; + } + sh_symtab = symtab[sec_symtab]; + sym_strtab = strtab[shdr[sec_symtab].sh_link]; + for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) { + Elf32_Rel *rel; + Elf32_Sym *sym; + unsigned r_type; + rel = &reltab[i][j]; + sym = &sh_symtab[ELF32_R_SYM(rel->r_info)]; + r_type = ELF32_R_TYPE(rel->r_info); + /* Don't visit relocations to absolute symbols */ + if (sym->st_shndx == SHN_ABS) { + continue; + } + if (r_type == R_386_PC32) { + /* PC relative relocations don't need to be adjusted */ + } + else if (r_type == R_386_32) { + /* Visit relocations that need to be adjusted */ + visit(rel, sym); + } + else { + die("Unsupported relocation type: %d\n", r_type); + } + } + } +} + +static void count_reloc(Elf32_Rel *rel, Elf32_Sym *sym) +{ + reloc_count += 1; +} + +static void collect_reloc(Elf32_Rel *rel, Elf32_Sym *sym) +{ + /* Remember the address that needs to be adjusted. */ + relocs[reloc_idx++] = rel->r_offset; +} + +static int cmp_relocs(const void *va, const void *vb) +{ + const unsigned long *a, *b; + a = va; b = vb; + return (*a == *b)? 0 : (*a > *b)? 1 : -1; +} + +static void emit_relocs(int as_text) +{ + int i; + /* Count how many relocations I have and allocate space for them. */ + reloc_count = 0; + walk_relocs(count_reloc); + relocs = malloc(reloc_count * sizeof(relocs[0])); + if (!relocs) { + die("malloc of %d entries for relocs failed\n", + reloc_count); + } + /* Collect up the relocations */ + reloc_idx = 0; + walk_relocs(collect_reloc); + + /* Order the relocations for more efficient processing */ + qsort(relocs, reloc_count, sizeof(relocs[0]), cmp_relocs); + + /* Print the relocations */ + if (as_text) { + /* Print the relocations in a form suitable that + * gas will like. + */ + printf(".section \".data.reloc\",\"a\"\n"); + printf(".balign 4\n"); + for(i = 0; i < reloc_count; i++) { + printf("\t .long 0x%08lx\n", relocs[i]); + } + printf("\n"); + } + else { + unsigned char buf[4]; + buf[0] = buf[1] = buf[2] = buf[3] = 0; + /* Print a stop */ + printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]); + /* Now print each relocation */ + for(i = 0; i < reloc_count; i++) { + buf[0] = (relocs[i] >> 0) & 0xff; + buf[1] = (relocs[i] >> 8) & 0xff; + buf[2] = (relocs[i] >> 16) & 0xff; + buf[3] = (relocs[i] >> 24) & 0xff; + printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]); + } + } +} + +static void usage(void) +{ + die("relocs [--abs-syms |--abs-relocs | --text] vmlinux\n"); +} + +int main(int argc, char **argv) +{ + int show_absolute_syms, show_absolute_relocs; + int as_text; + const char *fname; + FILE *fp; + int i; + + show_absolute_syms = 0; + show_absolute_relocs = 0; + as_text = 0; + fname = NULL; + for(i = 1; i < argc; i++) { + char *arg = argv[i]; + if (*arg == '-') { + if (strcmp(argv[1], "--abs-syms") == 0) { + show_absolute_syms = 1; + continue; + } + + if (strcmp(argv[1], "--abs-relocs") == 0) { + show_absolute_relocs = 1; + continue; + } + else if (strcmp(argv[1], "--text") == 0) { + as_text = 1; + continue; + } + } + else if (!fname) { + fname = arg; + continue; + } + usage(); + } + if (!fname) { + usage(); + } + fp = fopen(fname, "r"); + if (!fp) { + die("Cannot open %s: %s\n", + fname, strerror(errno)); + } + read_ehdr(fp); + read_shdrs(fp); + read_strtabs(fp); + read_symtabs(fp); + read_relocs(fp); + if (show_absolute_syms) { + print_absolute_symbols(); + return 0; + } + if (show_absolute_relocs) { + print_absolute_relocs(); + return 0; + } + emit_relocs(as_text); + return 0; +} diff --git a/arch/x86/boot/compressed/vmlinux_32.lds b/arch/x86/boot/compressed/vmlinux_32.lds new file mode 100644 index 00000000000..cc4854f6c6c --- /dev/null +++ b/arch/x86/boot/compressed/vmlinux_32.lds @@ -0,0 +1,43 @@ +OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386") +OUTPUT_ARCH(i386) +ENTRY(startup_32) +SECTIONS +{ + /* Be careful parts of head.S assume startup_32 is at + * address 0. + */ + . = 0 ; + .text.head : { + _head = . ; + *(.text.head) + _ehead = . ; + } + .data.compressed : { + *(.data.compressed) + } + .text : { + _text = .; /* Text */ + *(.text) + *(.text.*) + _etext = . ; + } + .rodata : { + _rodata = . ; + *(.rodata) /* read-only data */ + *(.rodata.*) + _erodata = . ; + } + .data : { + _data = . ; + *(.data) + *(.data.*) + _edata = . ; + } + .bss : { + _bss = . ; + *(.bss) + *(.bss.*) + *(COMMON) + _end = . ; + } +} diff --git a/arch/x86/boot/compressed/vmlinux_32.scr b/arch/x86/boot/compressed/vmlinux_32.scr new file mode 100644 index 00000000000..707a88f7f29 --- /dev/null +++ b/arch/x86/boot/compressed/vmlinux_32.scr @@ -0,0 +1,10 @@ +SECTIONS +{ + .data.compressed : { + input_len = .; + LONG(input_data_end - input_data) input_data = .; + *(.data) + output_len = . - 4; + input_data_end = .; + } +} diff --git a/arch/x86/boot/compressed/vmlinux_64.lds b/arch/x86/boot/compressed/vmlinux_64.lds new file mode 100644 index 00000000000..94c13e557fb --- /dev/null +++ b/arch/x86/boot/compressed/vmlinux_64.lds @@ -0,0 +1,44 @@ +OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64") +OUTPUT_ARCH(i386:x86-64) +ENTRY(startup_64) +SECTIONS +{ + /* Be careful parts of head.S assume startup_32 is at + * address 0. + */ + . = 0; + .text : { + _head = . ; + *(.text.head) + _ehead = . ; + *(.text.compressed) + _text = .; /* Text */ + *(.text) + *(.text.*) + _etext = . ; + } + .rodata : { + _rodata = . ; + *(.rodata) /* read-only data */ + *(.rodata.*) + _erodata = . ; + } + .data : { + _data = . ; + *(.data) + *(.data.*) + _edata = . ; + } + .bss : { + _bss = . ; + *(.bss) + *(.bss.*) + *(COMMON) + . = ALIGN(8); + _end = . ; + . = ALIGN(4096); + pgtable = . ; + . = . + 4096 * 6; + _heap = .; + } +} diff --git a/arch/x86/boot/compressed/vmlinux_64.scr b/arch/x86/boot/compressed/vmlinux_64.scr new file mode 100644 index 00000000000..bd1429ce193 --- /dev/null +++ b/arch/x86/boot/compressed/vmlinux_64.scr @@ -0,0 +1,10 @@ +SECTIONS +{ + .text.compressed : { + input_len = .; + LONG(input_data_end - input_data) input_data = .; + *(.data) + output_len = . - 4; + input_data_end = .; + } +} diff --git a/arch/x86/boot/copy.S b/arch/x86/boot/copy.S new file mode 100644 index 00000000000..ef127e56a3c --- /dev/null +++ b/arch/x86/boot/copy.S @@ -0,0 +1,101 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/copy.S + * + * Memory copy routines + */ + + .code16gcc + .text + + .globl memcpy + .type memcpy, @function +memcpy: + pushw %si + pushw %di + movw %ax, %di + movw %dx, %si + pushw %cx + shrw $2, %cx + rep; movsl + popw %cx + andw $3, %cx + rep; movsb + popw %di + popw %si + ret + .size memcpy, .-memcpy + + .globl memset + .type memset, @function +memset: + pushw %di + movw %ax, %di + movzbl %dl, %eax + imull $0x01010101,%eax + pushw %cx + shrw $2, %cx + rep; stosl + popw %cx + andw $3, %cx + rep; stosb + popw %di + ret + .size memset, .-memset + + .globl copy_from_fs + .type copy_from_fs, @function +copy_from_fs: + pushw %ds + pushw %fs + popw %ds + call memcpy + popw %ds + ret + .size copy_from_fs, .-copy_from_fs + + .globl copy_to_fs + .type copy_to_fs, @function +copy_to_fs: + pushw %es + pushw %fs + popw %es + call memcpy + popw %es + ret + .size copy_to_fs, .-copy_to_fs + +#if 0 /* Not currently used, but can be enabled as needed */ + + .globl copy_from_gs + .type copy_from_gs, @function +copy_from_gs: + pushw %ds + pushw %gs + popw %ds + call memcpy + popw %ds + ret + .size copy_from_gs, .-copy_from_gs + .globl copy_to_gs + + .type copy_to_gs, @function +copy_to_gs: + pushw %es + pushw %gs + popw %es + call memcpy + popw %es + ret + .size copy_to_gs, .-copy_to_gs + +#endif diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c new file mode 100644 index 00000000000..2a5c32da585 --- /dev/null +++ b/arch/x86/boot/cpu.c @@ -0,0 +1,69 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/cpu.c + * + * Check for obligatory CPU features and abort if the features are not + * present. + */ + +#include "boot.h" +#include "bitops.h" +#include <asm/cpufeature.h> + +static char *cpu_name(int level) +{ + static char buf[6]; + + if (level == 64) { + return "x86-64"; + } else { + sprintf(buf, "i%d86", level); + return buf; + } +} + +int validate_cpu(void) +{ + u32 *err_flags; + int cpu_level, req_level; + + check_cpu(&cpu_level, &req_level, &err_flags); + + if (cpu_level < req_level) { + printf("This kernel requires an %s CPU, ", + cpu_name(req_level)); + printf("but only detected an %s CPU.\n", + cpu_name(cpu_level)); + return -1; + } + + if (err_flags) { + int i, j; + puts("This kernel requires the following features " + "not present on the CPU:\n"); + + for (i = 0; i < NCAPINTS; i++) { + u32 e = err_flags[i]; + + for (j = 0; j < 32; j++) { + if (e & 1) + printf("%d:%d ", i, j); + + e >>= 1; + } + } + putchar('\n'); + return -1; + } else { + return 0; + } +} diff --git a/arch/x86/boot/cpucheck.c b/arch/x86/boot/cpucheck.c new file mode 100644 index 00000000000..e655a89c551 --- /dev/null +++ b/arch/x86/boot/cpucheck.c @@ -0,0 +1,268 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/cpucheck.c + * + * Check for obligatory CPU features and abort if the features are not + * present. This code should be compilable as 16-, 32- or 64-bit + * code, so be very careful with types and inline assembly. + * + * This code should not contain any messages; that requires an + * additional wrapper. + * + * As written, this code is not safe for inclusion into the kernel + * proper (after FPU initialization, in particular). + */ + +#ifdef _SETUP +# include "boot.h" +# include "bitops.h" +#endif +#include <linux/types.h> +#include <asm/cpufeature.h> +#include <asm/processor-flags.h> +#include <asm/required-features.h> +#include <asm/msr-index.h> + +struct cpu_features { + int level; /* Family, or 64 for x86-64 */ + int model; + u32 flags[NCAPINTS]; +}; + +static struct cpu_features cpu; +static u32 cpu_vendor[3]; +static u32 err_flags[NCAPINTS]; + +#ifdef CONFIG_X86_64 +static const int req_level = 64; +#elif defined(CONFIG_X86_MINIMUM_CPU_FAMILY) +static const int req_level = CONFIG_X86_MINIMUM_CPU_FAMILY; +#else +static const int req_level = 3; +#endif + +static const u32 req_flags[NCAPINTS] = +{ + REQUIRED_MASK0, + REQUIRED_MASK1, + REQUIRED_MASK2, + REQUIRED_MASK3, + REQUIRED_MASK4, + REQUIRED_MASK5, + REQUIRED_MASK6, + REQUIRED_MASK7, +}; + +#define A32(a,b,c,d) (((d) << 24)+((c) << 16)+((b) << 8)+(a)) + +static int is_amd(void) +{ + return cpu_vendor[0] == A32('A','u','t','h') && + cpu_vendor[1] == A32('e','n','t','i') && + cpu_vendor[2] == A32('c','A','M','D'); +} + +static int is_centaur(void) +{ + return cpu_vendor[0] == A32('C','e','n','t') && + cpu_vendor[1] == A32('a','u','r','H') && + cpu_vendor[2] == A32('a','u','l','s'); +} + +static int is_transmeta(void) +{ + return cpu_vendor[0] == A32('G','e','n','u') && + cpu_vendor[1] == A32('i','n','e','T') && + cpu_vendor[2] == A32('M','x','8','6'); +} + +static int has_fpu(void) +{ + u16 fcw = -1, fsw = -1; + u32 cr0; + + asm("movl %%cr0,%0" : "=r" (cr0)); + if (cr0 & (X86_CR0_EM|X86_CR0_TS)) { + cr0 &= ~(X86_CR0_EM|X86_CR0_TS); + asm volatile("movl %0,%%cr0" : : "r" (cr0)); + } + + asm volatile("fninit ; fnstsw %0 ; fnstcw %1" + : "+m" (fsw), "+m" (fcw)); + + return fsw == 0 && (fcw & 0x103f) == 0x003f; +} + +static int has_eflag(u32 mask) +{ + u32 f0, f1; + + asm("pushfl ; " + "pushfl ; " + "popl %0 ; " + "movl %0,%1 ; " + "xorl %2,%1 ; " + "pushl %1 ; " + "popfl ; " + "pushfl ; " + "popl %1 ; " + "popfl" + : "=&r" (f0), "=&r" (f1) + : "ri" (mask)); + + return !!((f0^f1) & mask); +} + +static void get_flags(void) +{ + u32 max_intel_level, max_amd_level; + u32 tfms; + + if (has_fpu()) + set_bit(X86_FEATURE_FPU, cpu.flags); + + if (has_eflag(X86_EFLAGS_ID)) { + asm("cpuid" + : "=a" (max_intel_level), + "=b" (cpu_vendor[0]), + "=d" (cpu_vendor[1]), + "=c" (cpu_vendor[2]) + : "a" (0)); + + if (max_intel_level >= 0x00000001 && + max_intel_level <= 0x0000ffff) { + asm("cpuid" + : "=a" (tfms), + "=c" (cpu.flags[4]), + "=d" (cpu.flags[0]) + : "a" (0x00000001) + : "ebx"); + cpu.level = (tfms >> 8) & 15; + cpu.model = (tfms >> 4) & 15; + if (cpu.level >= 6) + cpu.model += ((tfms >> 16) & 0xf) << 4; + } + + asm("cpuid" + : "=a" (max_amd_level) + : "a" (0x80000000) + : "ebx", "ecx", "edx"); + + if (max_amd_level >= 0x80000001 && + max_amd_level <= 0x8000ffff) { + u32 eax = 0x80000001; + asm("cpuid" + : "+a" (eax), + "=c" (cpu.flags[6]), + "=d" (cpu.flags[1]) + : : "ebx"); + } + } +} + +/* Returns a bitmask of which words we have error bits in */ +static int check_flags(void) +{ + u32 err; + int i; + + err = 0; + for (i = 0; i < NCAPINTS; i++) { + err_flags[i] = req_flags[i] & ~cpu.flags[i]; + if (err_flags[i]) + err |= 1 << i; + } + + return err; +} + +/* + * Returns -1 on error. + * + * *cpu_level is set to the current CPU level; *req_level to the required + * level. x86-64 is considered level 64 for this purpose. + * + * *err_flags_ptr is set to the flags error array if there are flags missing. + */ +int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr) +{ + int err; + + memset(&cpu.flags, 0, sizeof cpu.flags); + cpu.level = 3; + + if (has_eflag(X86_EFLAGS_AC)) + cpu.level = 4; + + get_flags(); + err = check_flags(); + + if (test_bit(X86_FEATURE_LM, cpu.flags)) + cpu.level = 64; + + if (err == 0x01 && + !(err_flags[0] & + ~((1 << X86_FEATURE_XMM)|(1 << X86_FEATURE_XMM2))) && + is_amd()) { + /* If this is an AMD and we're only missing SSE+SSE2, try to + turn them on */ + + u32 ecx = MSR_K7_HWCR; + u32 eax, edx; + + asm("rdmsr" : "=a" (eax), "=d" (edx) : "c" (ecx)); + eax &= ~(1 << 15); + asm("wrmsr" : : "a" (eax), "d" (edx), "c" (ecx)); + + get_flags(); /* Make sure it really did something */ + err = check_flags(); + } else if (err == 0x01 && + !(err_flags[0] & ~(1 << X86_FEATURE_CX8)) && + is_centaur() && cpu.model >= 6) { + /* If this is a VIA C3, we might have to enable CX8 + explicitly */ + + u32 ecx = MSR_VIA_FCR; + u32 eax, edx; + + asm("rdmsr" : "=a" (eax), "=d" (edx) : "c" (ecx)); + eax |= (1<<1)|(1<<7); + asm("wrmsr" : : "a" (eax), "d" (edx), "c" (ecx)); + + set_bit(X86_FEATURE_CX8, cpu.flags); + err = check_flags(); + } else if (err == 0x01 && is_transmeta()) { + /* Transmeta might have masked feature bits in word 0 */ + + u32 ecx = 0x80860004; + u32 eax, edx; + u32 level = 1; + + asm("rdmsr" : "=a" (eax), "=d" (edx) : "c" (ecx)); + asm("wrmsr" : : "a" (~0), "d" (edx), "c" (ecx)); + asm("cpuid" + : "+a" (level), "=d" (cpu.flags[0]) + : : "ecx", "ebx"); + asm("wrmsr" : : "a" (eax), "d" (edx), "c" (ecx)); + + err = check_flags(); + } + + if (err_flags_ptr) + *err_flags_ptr = err ? err_flags : NULL; + if (cpu_level_ptr) + *cpu_level_ptr = cpu.level; + if (req_level_ptr) + *req_level_ptr = req_level; + + return (cpu.level < req_level || err) ? -1 : 0; +} diff --git a/arch/x86/boot/edd.c b/arch/x86/boot/edd.c new file mode 100644 index 00000000000..bd138e442ec --- /dev/null +++ b/arch/x86/boot/edd.c @@ -0,0 +1,167 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/edd.c + * + * Get EDD BIOS disk information + */ + +#include "boot.h" +#include <linux/edd.h> + +#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) + +/* + * Read the MBR (first sector) from a specific device. + */ +static int read_mbr(u8 devno, void *buf) +{ + u16 ax, bx, cx, dx; + + ax = 0x0201; /* Legacy Read, one sector */ + cx = 0x0001; /* Sector 0-0-1 */ + dx = devno; + bx = (size_t)buf; + asm volatile("pushfl; stc; int $0x13; setc %%al; popfl" + : "+a" (ax), "+c" (cx), "+d" (dx), "+b" (bx) + : : "esi", "edi", "memory"); + + return -(u8)ax; /* 0 or -1 */ +} + +static u32 read_mbr_sig(u8 devno, struct edd_info *ei, u32 *mbrsig) +{ + int sector_size; + char *mbrbuf_ptr, *mbrbuf_end; + u32 buf_base, mbr_base; + extern char _end[]; + + sector_size = ei->params.bytes_per_sector; + if (!sector_size) + sector_size = 512; /* Best available guess */ + + /* Produce a naturally aligned buffer on the heap */ + buf_base = (ds() << 4) + (u32)&_end; + mbr_base = (buf_base+sector_size-1) & ~(sector_size-1); + mbrbuf_ptr = _end + (mbr_base-buf_base); + mbrbuf_end = mbrbuf_ptr + sector_size; + + /* Make sure we actually have space on the heap... */ + if (!(boot_params.hdr.loadflags & CAN_USE_HEAP)) + return -1; + if (mbrbuf_end > (char *)(size_t)boot_params.hdr.heap_end_ptr) + return -1; + + if (read_mbr(devno, mbrbuf_ptr)) + return -1; + + *mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET]; + return 0; +} + +static int get_edd_info(u8 devno, struct edd_info *ei) +{ + u16 ax, bx, cx, dx, di; + + memset(ei, 0, sizeof *ei); + + /* Check Extensions Present */ + + ax = 0x4100; + bx = EDDMAGIC1; + dx = devno; + asm("pushfl; stc; int $0x13; setc %%al; popfl" + : "+a" (ax), "+b" (bx), "=c" (cx), "+d" (dx) + : : "esi", "edi"); + + if ((u8)ax) + return -1; /* No extended information */ + + if (bx != EDDMAGIC2) + return -1; + + ei->device = devno; + ei->version = ax >> 8; /* EDD version number */ + ei->interface_support = cx; /* EDD functionality subsets */ + + /* Extended Get Device Parameters */ + + ei->params.length = sizeof(ei->params); + ax = 0x4800; + dx = devno; + asm("pushfl; int $0x13; popfl" + : "+a" (ax), "+d" (dx), "=m" (ei->params) + : "S" (&ei->params) + : "ebx", "ecx", "edi"); + + /* Get legacy CHS parameters */ + + /* Ralf Brown recommends setting ES:DI to 0:0 */ + ax = 0x0800; + dx = devno; + di = 0; + asm("pushw %%es; " + "movw %%di,%%es; " + "pushfl; stc; int $0x13; setc %%al; popfl; " + "popw %%es" + : "+a" (ax), "=b" (bx), "=c" (cx), "+d" (dx), "+D" (di) + : : "esi"); + + if ((u8)ax == 0) { + ei->legacy_max_cylinder = (cx >> 8) + ((cx & 0xc0) << 2); + ei->legacy_max_head = dx >> 8; + ei->legacy_sectors_per_track = cx & 0x3f; + } + + return 0; +} + +void query_edd(void) +{ + char eddarg[8]; + int do_mbr = 1; + int do_edd = 1; + int devno; + struct edd_info ei, *edp; + u32 *mbrptr; + + if (cmdline_find_option("edd", eddarg, sizeof eddarg) > 0) { + if (!strcmp(eddarg, "skipmbr") || !strcmp(eddarg, "skip")) + do_mbr = 0; + else if (!strcmp(eddarg, "off")) + do_edd = 0; + } + + edp = boot_params.eddbuf; + mbrptr = boot_params.edd_mbr_sig_buffer; + + if (!do_edd) + return; + + for (devno = 0x80; devno < 0x80+EDD_MBR_SIG_MAX; devno++) { + /* + * Scan the BIOS-supported hard disks and query EDD + * information... + */ + get_edd_info(devno, &ei); + + if (boot_params.eddbuf_entries < EDDMAXNR) { + memcpy(edp, &ei, sizeof ei); + edp++; + boot_params.eddbuf_entries++; + } + + if (do_mbr && !read_mbr_sig(devno, &ei, mbrptr++)) + boot_params.edd_mbr_sig_buf_entries = devno-0x80+1; + } +} + +#endif diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S new file mode 100644 index 00000000000..f3140e596d4 --- /dev/null +++ b/arch/x86/boot/header.S @@ -0,0 +1,283 @@ +/* + * header.S + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * Based on bootsect.S and setup.S + * modified by more people than can be counted + * + * Rewritten as a common file by H. Peter Anvin (Apr 2007) + * + * BIG FAT NOTE: We're in real mode using 64k segments. Therefore segment + * addresses must be multiplied by 16 to obtain their respective linear + * addresses. To avoid confusion, linear addresses are written using leading + * hex while segment addresses are written as segment:offset. + * + */ + +#include <asm/segment.h> +#include <linux/utsrelease.h> +#include <asm/boot.h> +#include <asm/e820.h> +#include <asm/page.h> +#include <asm/setup.h> +#include "boot.h" + +SETUPSECTS = 4 /* default nr of setup-sectors */ +BOOTSEG = 0x07C0 /* original address of boot-sector */ +SYSSEG = DEF_SYSSEG /* system loaded at 0x10000 (65536) */ +SYSSIZE = DEF_SYSSIZE /* system size: # of 16-byte clicks */ + /* to be loaded */ +ROOT_DEV = 0 /* ROOT_DEV is now written by "build" */ +SWAP_DEV = 0 /* SWAP_DEV is now written by "build" */ + +#ifndef SVGA_MODE +#define SVGA_MODE ASK_VGA +#endif + +#ifndef RAMDISK +#define RAMDISK 0 +#endif + +#ifndef ROOT_RDONLY +#define ROOT_RDONLY 1 +#endif + + .code16 + .section ".bstext", "ax" + + .global bootsect_start +bootsect_start: + + # Normalize the start address + ljmp $BOOTSEG, $start2 + +start2: + movw %cs, %ax + movw %ax, %ds + movw %ax, %es + movw %ax, %ss + xorw %sp, %sp + sti + cld + + movw $bugger_off_msg, %si + +msg_loop: + lodsb + andb %al, %al + jz bs_die + movb $0xe, %ah + movw $7, %bx + int $0x10 + jmp msg_loop + +bs_die: + # Allow the user to press a key, then reboot + xorw %ax, %ax + int $0x16 + int $0x19 + + # int 0x19 should never return. In case it does anyway, + # invoke the BIOS reset code... + ljmp $0xf000,$0xfff0 + + .section ".bsdata", "a" +bugger_off_msg: + .ascii "Direct booting from floppy is no longer supported.\r\n" + .ascii "Please use a boot loader program instead.\r\n" + .ascii "\n" + .ascii "Remove disk and press any key to reboot . . .\r\n" + .byte 0 + + + # Kernel attributes; used by setup. This is part 1 of the + # header, from the old boot sector. + + .section ".header", "a" + .globl hdr +hdr: +setup_sects: .byte SETUPSECTS +root_flags: .word ROOT_RDONLY +syssize: .long SYSSIZE +ram_size: .word RAMDISK +vid_mode: .word SVGA_MODE +root_dev: .word ROOT_DEV +boot_flag: .word 0xAA55 + + # offset 512, entry point + + .globl _start +_start: + # Explicitly enter this as bytes, or the assembler + # tries to generate a 3-byte jump here, which causes + # everything else to push off to the wrong offset. + .byte 0xeb # short (2-byte) jump + .byte start_of_setup-1f +1: + + # Part 2 of the header, from the old setup.S + + .ascii "HdrS" # header signature + .word 0x0206 # header version number (>= 0x0105) + # or else old loadlin-1.5 will fail) + .globl realmode_swtch +realmode_swtch: .word 0, 0 # default_switch, SETUPSEG +start_sys_seg: .word SYSSEG + .word kernel_version-512 # pointing to kernel version string + # above section of header is compatible + # with loadlin-1.5 (header v1.5). Don't + # change it. + +type_of_loader: .byte 0 # = 0, old one (LILO, Loadlin, + # Bootlin, SYSLX, bootsect...) + # See Documentation/i386/boot.txt for + # assigned ids + +# flags, unused bits must be zero (RFU) bit within loadflags +loadflags: +LOADED_HIGH = 1 # If set, the kernel is loaded high +CAN_USE_HEAP = 0x80 # If set, the loader also has set + # heap_end_ptr to tell how much + # space behind setup.S can be used for + # heap purposes. + # Only the loader knows what is free +#ifndef __BIG_KERNEL__ + .byte 0 +#else + .byte LOADED_HIGH +#endif + +setup_move_size: .word 0x8000 # size to move, when setup is not + # loaded at 0x90000. We will move setup + # to 0x90000 then just before jumping + # into the kernel. However, only the + # loader knows how much data behind + # us also needs to be loaded. + +code32_start: # here loaders can put a different + # start address for 32-bit code. +#ifndef __BIG_KERNEL__ + .long 0x1000 # 0x1000 = default for zImage +#else + .long 0x100000 # 0x100000 = default for big kernel +#endif + +ramdisk_image: .long 0 # address of loaded ramdisk image + # Here the loader puts the 32-bit + # address where it loaded the image. + # This only will be read by the kernel. + +ramdisk_size: .long 0 # its size in bytes + +bootsect_kludge: + .long 0 # obsolete + +heap_end_ptr: .word _end+1024 # (Header version 0x0201 or later) + # space from here (exclusive) down to + # end of setup code can be used by setup + # for local heap purposes. + +pad1: .word 0 +cmd_line_ptr: .long 0 # (Header version 0x0202 or later) + # If nonzero, a 32-bit pointer + # to the kernel command line. + # The command line should be + # located between the start of + # setup and the end of low + # memory (0xa0000), or it may + # get overwritten before it + # gets read. If this field is + # used, there is no longer + # anything magical about the + # 0x90000 segment; the setup + # can be located anywhere in + # low memory 0x10000 or higher. + +ramdisk_max: .long (-__PAGE_OFFSET-(512 << 20)-1) & 0x7fffffff + # (Header version 0x0203 or later) + # The highest safe address for + # the contents of an initrd + +kernel_alignment: .long CONFIG_PHYSICAL_ALIGN #physical addr alignment + #required for protected mode + #kernel +#ifdef CONFIG_RELOCATABLE +relocatable_kernel: .byte 1 +#else +relocatable_kernel: .byte 0 +#endif +pad2: .byte 0 +pad3: .word 0 + +cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line, + #added with boot protocol + #version 2.06 + +# End of setup header ##################################################### + + .section ".inittext", "ax" +start_of_setup: +#ifdef SAFE_RESET_DISK_CONTROLLER +# Reset the disk controller. + movw $0x0000, %ax # Reset disk controller + movb $0x80, %dl # All disks + int $0x13 +#endif + +# We will have entered with %cs = %ds+0x20, normalize %cs so +# it is on par with the other segments. + pushw %ds + pushw $setup2 + lretw + +setup2: +# Force %es = %ds + movw %ds, %ax + movw %ax, %es + cld + +# Stack paranoia: align the stack and make sure it is good +# for both 16- and 32-bit references. In particular, if we +# were meant to have been using the full 16-bit segment, the +# caller might have set %sp to zero, which breaks %esp-based +# references. + andw $~3, %sp # dword align (might as well...) + jnz 1f + movw $0xfffc, %sp # Make sure we're not zero +1: movzwl %sp, %esp # Clear upper half of %esp + sti + +# Check signature at end of setup + cmpl $0x5a5aaa55, setup_sig + jne setup_bad + +# Zero the bss + movw $__bss_start, %di + movw $_end+3, %cx + xorl %eax, %eax + subw %di, %cx + shrw $2, %cx + rep; stosl + +# Jump to C code (should not return) + calll main + +# Setup corrupt somehow... +setup_bad: + movl $setup_corrupt, %eax + calll puts + # Fall through... + + .globl die + .type die, @function +die: + hlt + jmp die + + .size die, .-die + + .section ".initdata", "a" +setup_corrupt: + .byte 7 + .string "No setup signature found...\n" diff --git a/arch/x86/boot/install.sh b/arch/x86/boot/install.sh new file mode 100644 index 00000000000..88d77761d01 --- /dev/null +++ b/arch/x86/boot/install.sh @@ -0,0 +1,61 @@ +#!/bin/sh +# +# arch/i386/boot/install.sh +# +# This file is subject to the terms and conditions of the GNU General Public +# License. See the file "COPYING" in the main directory of this archive +# for more details. +# +# Copyright (C) 1995 by Linus Torvalds +# +# Adapted from code in arch/i386/boot/Makefile by H. Peter Anvin +# +# "make install" script for i386 architecture +# +# Arguments: +# $1 - kernel version +# $2 - kernel image file +# $3 - kernel map file +# $4 - default install path (blank if root directory) +# + +verify () { + if [ ! -f "$1" ]; then + echo "" 1>&2 + echo " *** Missing file: $1" 1>&2 + echo ' *** You need to run "make" before "make install".' 1>&2 + echo "" 1>&2 + exit 1 + fi +} + +# Make sure the files actually exist +verify "$2" +verify "$3" + +# User may have a custom install script + +if [ -x ~/bin/${CROSS_COMPILE}installkernel ]; then exec ~/bin/${CROSS_COMPILE}installkernel "$@"; fi +if [ -x /sbin/${CROSS_COMPILE}installkernel ]; then exec /sbin/${CROSS_COMPILE}installkernel "$@"; fi + +# Default install - same as make zlilo + +if [ -f $4/vmlinuz ]; then + mv $4/vmlinuz $4/vmlinuz.old +fi + +if [ -f $4/System.map ]; then + mv $4/System.map $4/System.old +fi + +cat $2 > $4/vmlinuz +cp $3 $4/System.map + +if [ -x /sbin/lilo ]; then + /sbin/lilo +elif [ -x /etc/lilo/install ]; then + /etc/lilo/install +else + sync + echo "Cannot find LILO." +fi diff --git a/arch/x86/boot/main.c b/arch/x86/boot/main.c new file mode 100644 index 00000000000..0eeef3989a1 --- /dev/null +++ b/arch/x86/boot/main.c @@ -0,0 +1,161 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/main.c + * + * Main module for the real-mode kernel code + */ + +#include "boot.h" + +struct boot_params boot_params __attribute__((aligned(16))); + +char *HEAP = _end; +char *heap_end = _end; /* Default end of heap = no heap */ + +/* + * Copy the header into the boot parameter block. Since this + * screws up the old-style command line protocol, adjust by + * filling in the new-style command line pointer instead. + */ +#define OLD_CL_MAGIC 0xA33F +#define OLD_CL_ADDRESS 0x20 + +static void copy_boot_params(void) +{ + struct old_cmdline { + u16 cl_magic; + u16 cl_offset; + }; + const struct old_cmdline * const oldcmd = + (const struct old_cmdline *)OLD_CL_ADDRESS; + + BUILD_BUG_ON(sizeof boot_params != 4096); + memcpy(&boot_params.hdr, &hdr, sizeof hdr); + + if (!boot_params.hdr.cmd_line_ptr && + oldcmd->cl_magic == OLD_CL_MAGIC) { + /* Old-style command line protocol. */ + u16 cmdline_seg; + + /* Figure out if the command line falls in the region + of memory that an old kernel would have copied up + to 0x90000... */ + if (oldcmd->cl_offset < boot_params.hdr.setup_move_size) + cmdline_seg = ds(); + else + cmdline_seg = 0x9000; + + boot_params.hdr.cmd_line_ptr = + (cmdline_seg << 4) + oldcmd->cl_offset; + } +} + +/* + * Set the keyboard repeat rate to maximum. Unclear why this + * is done here; this might be possible to kill off as stale code. + */ +static void keyboard_set_repeat(void) +{ + u16 ax = 0x0305; + u16 bx = 0; + asm volatile("int $0x16" + : "+a" (ax), "+b" (bx) + : : "ecx", "edx", "esi", "edi"); +} + +/* + * Get Intel SpeedStep (IST) information. + */ +static void query_ist(void) +{ + asm("int $0x15" + : "=a" (boot_params.ist_info.signature), + "=b" (boot_params.ist_info.command), + "=c" (boot_params.ist_info.event), + "=d" (boot_params.ist_info.perf_level) + : "a" (0x0000e980), /* IST Support */ + "d" (0x47534943)); /* Request value */ +} + +/* + * Tell the BIOS what CPU mode we intend to run in. + */ +static void set_bios_mode(void) +{ +#ifdef CONFIG_X86_64 + u32 eax, ebx; + + eax = 0xec00; + ebx = 2; + asm volatile("int $0x15" + : "+a" (eax), "+b" (ebx) + : : "ecx", "edx", "esi", "edi"); +#endif +} + +void main(void) +{ + /* First, copy the boot header into the "zeropage" */ + copy_boot_params(); + + /* End of heap check */ + if (boot_params.hdr.loadflags & CAN_USE_HEAP) { + heap_end = (char *)(boot_params.hdr.heap_end_ptr + +0x200-STACK_SIZE); + } else { + /* Boot protocol 2.00 only, no heap available */ + puts("WARNING: Ancient bootloader, some functionality " + "may be limited!\n"); + } + + /* Make sure we have all the proper CPU support */ + if (validate_cpu()) { + puts("Unable to boot - please use a kernel appropriate " + "for your CPU.\n"); + die(); + } + + /* Tell the BIOS what CPU mode we intend to run in. */ + set_bios_mode(); + + /* Detect memory layout */ + detect_memory(); + + /* Set keyboard repeat rate (why?) */ + keyboard_set_repeat(); + + /* Set the video mode */ + set_video(); + + /* Query MCA information */ + query_mca(); + + /* Voyager */ +#ifdef CONFIG_X86_VOYAGER + query_voyager(); +#endif + + /* Query Intel SpeedStep (IST) information */ + query_ist(); + + /* Query APM information */ +#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE) + query_apm_bios(); +#endif + + /* Query EDD information */ +#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) + query_edd(); +#endif + /* Do the last things and invoke protected mode */ + go_to_protected_mode(); +} diff --git a/arch/x86/boot/mca.c b/arch/x86/boot/mca.c new file mode 100644 index 00000000000..68222f2d4b6 --- /dev/null +++ b/arch/x86/boot/mca.c @@ -0,0 +1,43 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/mca.c + * + * Get the MCA system description table + */ + +#include "boot.h" + +int query_mca(void) +{ + u8 err; + u16 es, bx, len; + + asm("pushw %%es ; " + "int $0x15 ; " + "setc %0 ; " + "movw %%es, %1 ; " + "popw %%es" + : "=acd" (err), "=acdSD" (es), "=b" (bx) + : "a" (0xc000)); + + if (err) + return -1; /* No MCA present */ + + set_fs(es); + len = rdfs16(bx); + + if (len > sizeof(boot_params.sys_desc_table)) + len = sizeof(boot_params.sys_desc_table); + + copy_from_fs(&boot_params.sys_desc_table, bx, len); + return 0; +} diff --git a/arch/x86/boot/memory.c b/arch/x86/boot/memory.c new file mode 100644 index 00000000000..378353956b5 --- /dev/null +++ b/arch/x86/boot/memory.c @@ -0,0 +1,118 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/memory.c + * + * Memory detection code + */ + +#include "boot.h" + +#define SMAP 0x534d4150 /* ASCII "SMAP" */ + +static int detect_memory_e820(void) +{ + int count = 0; + u32 next = 0; + u32 size, id; + u8 err; + struct e820entry *desc = boot_params.e820_map; + + do { + size = sizeof(struct e820entry); + + /* Important: %edx is clobbered by some BIOSes, + so it must be either used for the error output + or explicitly marked clobbered. */ + asm("int $0x15; setc %0" + : "=d" (err), "+b" (next), "=a" (id), "+c" (size), + "=m" (*desc) + : "D" (desc), "d" (SMAP), "a" (0xe820)); + + /* Some BIOSes stop returning SMAP in the middle of + the search loop. We don't know exactly how the BIOS + screwed up the map at that point, we might have a + partial map, the full map, or complete garbage, so + just return failure. */ + if (id != SMAP) { + count = 0; + break; + } + + if (err) + break; + + count++; + desc++; + } while (next && count < E820MAX); + + return boot_params.e820_entries = count; +} + +static int detect_memory_e801(void) +{ + u16 ax, bx, cx, dx; + u8 err; + + bx = cx = dx = 0; + ax = 0xe801; + asm("stc; int $0x15; setc %0" + : "=m" (err), "+a" (ax), "+b" (bx), "+c" (cx), "+d" (dx)); + + if (err) + return -1; + + /* Do we really need to do this? */ + if (cx || dx) { + ax = cx; + bx = dx; + } + + if (ax > 15*1024) + return -1; /* Bogus! */ + + /* This ignores memory above 16MB if we have a memory hole + there. If someone actually finds a machine with a memory + hole at 16MB and no support for 0E820h they should probably + generate a fake e820 map. */ + boot_params.alt_mem_k = (ax == 15*1024) ? (dx << 6)+ax : ax; + + return 0; +} + +static int detect_memory_88(void) +{ + u16 ax; + u8 err; + + ax = 0x8800; + asm("stc; int $0x15; setc %0" : "=bcdm" (err), "+a" (ax)); + + boot_params.screen_info.ext_mem_k = ax; + + return -err; +} + +int detect_memory(void) +{ + int err = -1; + + if (detect_memory_e820() > 0) + err = 0; + + if (!detect_memory_e801()) + err = 0; + + if (!detect_memory_88()) + err = 0; + + return err; +} diff --git a/arch/x86/boot/mtools.conf.in b/arch/x86/boot/mtools.conf.in new file mode 100644 index 00000000000..efd6d2490c1 --- /dev/null +++ b/arch/x86/boot/mtools.conf.in @@ -0,0 +1,17 @@ +# +# mtools configuration file for "make (b)zdisk" +# + +# Actual floppy drive +drive a: + file="/dev/fd0" + +# 1.44 MB floppy disk image +drive v: + file="@OBJ@/fdimage" cylinders=80 heads=2 sectors=18 filter + +# 2.88 MB floppy disk image (mostly for virtual uses) +drive w: + file="@OBJ@/fdimage" cylinders=80 heads=2 sectors=36 filter + + diff --git a/arch/x86/boot/pm.c b/arch/x86/boot/pm.c new file mode 100644 index 00000000000..09fb342cc62 --- /dev/null +++ b/arch/x86/boot/pm.c @@ -0,0 +1,174 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/pm.c + * + * Prepare the machine for transition to protected mode. + */ + +#include "boot.h" +#include <asm/segment.h> + +/* + * Invoke the realmode switch hook if present; otherwise + * disable all interrupts. + */ +static void realmode_switch_hook(void) +{ + if (boot_params.hdr.realmode_swtch) { + asm volatile("lcallw *%0" + : : "m" (boot_params.hdr.realmode_swtch) + : "eax", "ebx", "ecx", "edx"); + } else { + asm volatile("cli"); + outb(0x80, 0x70); /* Disable NMI */ + io_delay(); + } +} + +/* + * A zImage kernel is loaded at 0x10000 but wants to run at 0x1000. + * A bzImage kernel is loaded and runs at 0x100000. + */ +static void move_kernel_around(void) +{ + /* Note: rely on the compile-time option here rather than + the LOADED_HIGH flag. The Qemu kernel loader unconditionally + sets the loadflags to zero. */ +#ifndef __BIG_KERNEL__ + u16 dst_seg, src_seg; + u32 syssize; + + dst_seg = 0x1000 >> 4; + src_seg = 0x10000 >> 4; + syssize = boot_params.hdr.syssize; /* Size in 16-byte paragraphs */ + + while (syssize) { + int paras = (syssize >= 0x1000) ? 0x1000 : syssize; + int dwords = paras << 2; + + asm volatile("pushw %%es ; " + "pushw %%ds ; " + "movw %1,%%es ; " + "movw %2,%%ds ; " + "xorw %%di,%%di ; " + "xorw %%si,%%si ; " + "rep;movsl ; " + "popw %%ds ; " + "popw %%es" + : "+c" (dwords) + : "r" (dst_seg), "r" (src_seg) + : "esi", "edi"); + + syssize -= paras; + dst_seg += paras; + src_seg += paras; + } +#endif +} + +/* + * Disable all interrupts at the legacy PIC. + */ +static void mask_all_interrupts(void) +{ + outb(0xff, 0xa1); /* Mask all interrupts on the secondary PIC */ + io_delay(); + outb(0xfb, 0x21); /* Mask all but cascade on the primary PIC */ + io_delay(); +} + +/* + * Reset IGNNE# if asserted in the FPU. + */ +static void reset_coprocessor(void) +{ + outb(0, 0xf0); + io_delay(); + outb(0, 0xf1); + io_delay(); +} + +/* + * Set up the GDT + */ +#define GDT_ENTRY(flags,base,limit) \ + (((u64)(base & 0xff000000) << 32) | \ + ((u64)flags << 40) | \ + ((u64)(limit & 0x00ff0000) << 32) | \ + ((u64)(base & 0x00ffff00) << 16) | \ + ((u64)(limit & 0x0000ffff))) + +struct gdt_ptr { + u16 len; + u32 ptr; +} __attribute__((packed)); + +static void setup_gdt(void) +{ + /* There are machines which are known to not boot with the GDT + being 8-byte unaligned. Intel recommends 16 byte alignment. */ + static const u64 boot_gdt[] __attribute__((aligned(16))) = { + /* CS: code, read/execute, 4 GB, base 0 */ + [GDT_ENTRY_BOOT_CS] = GDT_ENTRY(0xc09b, 0, 0xfffff), + /* DS: data, read/write, 4 GB, base 0 */ + [GDT_ENTRY_BOOT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff), + }; + /* Xen HVM incorrectly stores a pointer to the gdt_ptr, instead + of the gdt_ptr contents. Thus, make it static so it will + stay in memory, at least long enough that we switch to the + proper kernel GDT. */ + static struct gdt_ptr gdt; + + gdt.len = sizeof(boot_gdt)-1; + gdt.ptr = (u32)&boot_gdt + (ds() << 4); + + asm volatile("lgdtl %0" : : "m" (gdt)); +} + +/* + * Set up the IDT + */ +static void setup_idt(void) +{ + static const struct gdt_ptr null_idt = {0, 0}; + asm volatile("lidtl %0" : : "m" (null_idt)); +} + +/* + * Actual invocation sequence + */ +void go_to_protected_mode(void) +{ + /* Hook before leaving real mode, also disables interrupts */ + realmode_switch_hook(); + + /* Move the kernel/setup to their final resting places */ + move_kernel_around(); + + /* Enable the A20 gate */ + if (enable_a20()) { + puts("A20 gate not responding, unable to boot...\n"); + die(); + } + + /* Reset coprocessor (IGNNE#) */ + reset_coprocessor(); + + /* Mask all interrupts in the PIC */ + mask_all_interrupts(); + + /* Actual transition to protected mode... */ + setup_idt(); + setup_gdt(); + protected_mode_jump(boot_params.hdr.code32_start, + (u32)&boot_params + (ds() << 4)); +} diff --git a/arch/x86/boot/pmjump.S b/arch/x86/boot/pmjump.S new file mode 100644 index 00000000000..2e559233725 --- /dev/null +++ b/arch/x86/boot/pmjump.S @@ -0,0 +1,54 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/pmjump.S + * + * The actual transition into protected mode + */ + +#include <asm/boot.h> +#include <asm/segment.h> + + .text + + .globl protected_mode_jump + .type protected_mode_jump, @function + + .code16 + +/* + * void protected_mode_jump(u32 entrypoint, u32 bootparams); + */ +protected_mode_jump: + xorl %ebx, %ebx # Flag to indicate this is a boot + movl %edx, %esi # Pointer to boot_params table + movl %eax, 2f # Patch ljmpl instruction + jmp 1f # Short jump to flush instruction q. + +1: + movw $__BOOT_DS, %cx + + movl %cr0, %edx + orb $1, %dl # Protected mode (PE) bit + movl %edx, %cr0 + + movw %cx, %ds + movw %cx, %es + movw %cx, %fs + movw %cx, %gs + movw %cx, %ss + + # Jump to the 32-bit entrypoint + .byte 0x66, 0xea # ljmpl opcode +2: .long 0 # offset + .word __BOOT_CS # segment + + .size protected_mode_jump, .-protected_mode_jump diff --git a/arch/x86/boot/printf.c b/arch/x86/boot/printf.c new file mode 100644 index 00000000000..1a09f9309d3 --- /dev/null +++ b/arch/x86/boot/printf.c @@ -0,0 +1,307 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/printf.c + * + * Oh, it's a waste of space, but oh-so-yummy for debugging. This + * version of printf() does not include 64-bit support. "Live with + * it." + * + */ + +#include "boot.h" + +static int skip_atoi(const char **s) +{ + int i = 0; + + while (isdigit(**s)) + i = i * 10 + *((*s)++) - '0'; + return i; +} + +#define ZEROPAD 1 /* pad with zero */ +#define SIGN 2 /* unsigned/signed long */ +#define PLUS 4 /* show plus */ +#define SPACE 8 /* space if plus */ +#define LEFT 16 /* left justified */ +#define SPECIAL 32 /* 0x */ +#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */ + +#define do_div(n,base) ({ \ +int __res; \ +__res = ((unsigned long) n) % (unsigned) base; \ +n = ((unsigned long) n) / (unsigned) base; \ +__res; }) + +static char *number(char *str, long num, int base, int size, int precision, + int type) +{ + char c, sign, tmp[66]; + const char *digits = "0123456789abcdefghijklmnopqrstuvwxyz"; + int i; + + if (type & LARGE) + digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; + if (type & LEFT) + type &= ~ZEROPAD; + if (base < 2 || base > 36) + return 0; + c = (type & ZEROPAD) ? '0' : ' '; + sign = 0; + if (type & SIGN) { + if (num < 0) { + sign = '-'; + num = -num; + size--; + } else if (type & PLUS) { + sign = '+'; + size--; + } else if (type & SPACE) { + sign = ' '; + size--; + } + } + if (type & SPECIAL) { + if (base == 16) + size -= 2; + else if (base == 8) + size--; + } + i = 0; + if (num == 0) + tmp[i++] = '0'; + else + while (num != 0) + tmp[i++] = digits[do_div(num, base)]; + if (i > precision) + precision = i; + size -= precision; + if (!(type & (ZEROPAD + LEFT))) + while (size-- > 0) + *str++ = ' '; + if (sign) + *str++ = sign; + if (type & SPECIAL) { + if (base == 8) + *str++ = '0'; + else if (base == 16) { + *str++ = '0'; + *str++ = digits[33]; + } + } + if (!(type & LEFT)) + while (size-- > 0) + *str++ = c; + while (i < precision--) + *str++ = '0'; + while (i-- > 0) + *str++ = tmp[i]; + while (size-- > 0) + *str++ = ' '; + return str; +} + +int vsprintf(char *buf, const char *fmt, va_list args) +{ + int len; + unsigned long num; + int i, base; + char *str; + const char *s; + + int flags; /* flags to number() */ + + int field_width; /* width of output field */ + int precision; /* min. # of digits for integers; max + number of chars for from string */ + int qualifier; /* 'h', 'l', or 'L' for integer fields */ + + for (str = buf; *fmt; ++fmt) { + if (*fmt != '%') { + *str++ = *fmt; + continue; + } + + /* process flags */ + flags = 0; + repeat: + ++fmt; /* this also skips first '%' */ + switch (*fmt) { + case '-': + flags |= LEFT; + goto repeat; + case '+': + flags |= PLUS; + goto repeat; + case ' ': + flags |= SPACE; + goto repeat; + case '#': + flags |= SPECIAL; + goto repeat; + case '0': + flags |= ZEROPAD; + goto repeat; + } + + /* get field width */ + field_width = -1; + if (isdigit(*fmt)) + field_width = skip_atoi(&fmt); + else if (*fmt == '*') { + ++fmt; + /* it's the next argument */ + field_width = va_arg(args, int); + if (field_width < 0) { + field_width = -field_width; + flags |= LEFT; + } + } + + /* get the precision */ + precision = -1; + if (*fmt == '.') { + ++fmt; + if (isdigit(*fmt)) + precision = skip_atoi(&fmt); + else if (*fmt == '*') { + ++fmt; + /* it's the next argument */ + precision = va_arg(args, int); + } + if (precision < 0) + precision = 0; + } + + /* get the conversion qualifier */ + qualifier = -1; + if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') { + qualifier = *fmt; + ++fmt; + } + + /* default base */ + base = 10; + + switch (*fmt) { + case 'c': + if (!(flags & LEFT)) + while (--field_width > 0) + *str++ = ' '; + *str++ = (unsigned char)va_arg(args, int); + while (--field_width > 0) + *str++ = ' '; + continue; + + case 's': + s = va_arg(args, char *); + len = strnlen(s, precision); + + if (!(flags & LEFT)) + while (len < field_width--) + *str++ = ' '; + for (i = 0; i < len; ++i) + *str++ = *s++; + while (len < field_width--) + *str++ = ' '; + continue; + + case 'p': + if (field_width == -1) { + field_width = 2 * sizeof(void *); + flags |= ZEROPAD; + } + str = number(str, + (unsigned long)va_arg(args, void *), 16, + field_width, precision, flags); + continue; + + case 'n': + if (qualifier == 'l') { + long *ip = va_arg(args, long *); + *ip = (str - buf); + } else { + int *ip = va_arg(args, int *); + *ip = (str - buf); + } + continue; + + case '%': + *str++ = '%'; + continue; + + /* integer number formats - set up the flags and "break" */ + case 'o': + base = 8; + break; + + case 'X': + flags |= LARGE; + case 'x': + base = 16; + break; + + case 'd': + case 'i': + flags |= SIGN; + case 'u': + break; + + default: + *str++ = '%'; + if (*fmt) + *str++ = *fmt; + else + --fmt; + continue; + } + if (qualifier == 'l') + num = va_arg(args, unsigned long); + else if (qualifier == 'h') { + num = (unsigned short)va_arg(args, int); + if (flags & SIGN) + num = (short)num; + } else if (flags & SIGN) + num = va_arg(args, int); + else + num = va_arg(args, unsigned int); + str = number(str, num, base, field_width, precision, flags); + } + *str = '\0'; + return str - buf; +} + +int sprintf(char *buf, const char *fmt, ...) +{ + va_list args; + int i; + + va_start(args, fmt); + i = vsprintf(buf, fmt, args); + va_end(args); + return i; +} + +int printf(const char *fmt, ...) +{ + char printf_buf[1024]; + va_list args; + int printed; + + va_start(args, fmt); + printed = vsprintf(printf_buf, fmt, args); + va_end(args); + + puts(printf_buf); + + return printed; +} diff --git a/arch/x86/boot/setup.ld b/arch/x86/boot/setup.ld new file mode 100644 index 00000000000..df9234b3a5e --- /dev/null +++ b/arch/x86/boot/setup.ld @@ -0,0 +1,54 @@ +/* + * setup.ld + * + * Linker script for the i386 setup code + */ +OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386") +OUTPUT_ARCH(i386) +ENTRY(_start) + +SECTIONS +{ + . = 0; + .bstext : { *(.bstext) } + .bsdata : { *(.bsdata) } + + . = 497; + .header : { *(.header) } + .inittext : { *(.inittext) } + .initdata : { *(.initdata) } + .text : { *(.text*) } + + . = ALIGN(16); + .rodata : { *(.rodata*) } + + .videocards : { + video_cards = .; + *(.videocards) + video_cards_end = .; + } + + . = ALIGN(16); + .data : { *(.data*) } + + .signature : { + setup_sig = .; + LONG(0x5a5aaa55) + } + + + . = ALIGN(16); + .bss : + { + __bss_start = .; + *(.bss) + __bss_end = .; + } + . = ALIGN(16); + _end = .; + + /DISCARD/ : { *(.note*) } + + . = ASSERT(_end <= 0x8000, "Setup too big!"); + . = ASSERT(hdr == 0x1f1, "The setup header has the wrong offset!"); +} diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c new file mode 100644 index 00000000000..481a2209778 --- /dev/null +++ b/arch/x86/boot/string.c @@ -0,0 +1,52 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/string.c + * + * Very basic string functions + */ + +#include "boot.h" + +int strcmp(const char *str1, const char *str2) +{ + const unsigned char *s1 = (const unsigned char *)str1; + const unsigned char *s2 = (const unsigned char *)str2; + int delta = 0; + + while (*s1 || *s2) { + delta = *s2 - *s1; + if (delta) + return delta; + s1++; + s2++; + } + return 0; +} + +size_t strnlen(const char *s, size_t maxlen) +{ + const char *es = s; + while (*es && maxlen) { + es++; + maxlen--; + } + + return (es - s); +} + +unsigned int atou(const char *s) +{ + unsigned int i = 0; + while (isdigit(*s)) + i = i * 10 + (*s++ - '0'); + return i; +} diff --git a/arch/x86/boot/tools/.gitignore b/arch/x86/boot/tools/.gitignore new file mode 100644 index 00000000000..378eac25d31 --- /dev/null +++ b/arch/x86/boot/tools/.gitignore @@ -0,0 +1 @@ +build diff --git a/arch/x86/boot/tools/build.c b/arch/x86/boot/tools/build.c new file mode 100644 index 00000000000..b4248740ff0 --- /dev/null +++ b/arch/x86/boot/tools/build.c @@ -0,0 +1,168 @@ +/* + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright (C) 1997 Martin Mares + * Copyright (C) 2007 H. Peter Anvin + */ + +/* + * This file builds a disk-image from two different files: + * + * - setup: 8086 machine code, sets up system parm + * - system: 80386 code for actual system + * + * It does some checking that all files are of the correct type, and + * just writes the result to stdout, removing headers and padding to + * the right amount. It also writes some system data to stderr. + */ + +/* + * Changes by tytso to allow root device specification + * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 + * Cross compiling fixes by Gertjan van Wingerde, July 1996 + * Rewritten by Martin Mares, April 1997 + * Substantially overhauled by H. Peter Anvin, April 2007 + */ + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <stdarg.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/sysmacros.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/mman.h> +#include <asm/boot.h> + +typedef unsigned char u8; +typedef unsigned short u16; +typedef unsigned long u32; + +#define DEFAULT_MAJOR_ROOT 0 +#define DEFAULT_MINOR_ROOT 0 + +/* Minimal number of setup sectors */ +#define SETUP_SECT_MIN 5 +#define SETUP_SECT_MAX 64 + +/* This must be large enough to hold the entire setup */ +u8 buf[SETUP_SECT_MAX*512]; +int is_big_kernel; + +static void die(const char * str, ...) +{ + va_list args; + va_start(args, str); + vfprintf(stderr, str, args); + fputc('\n', stderr); + exit(1); +} + +static void usage(void) +{ + die("Usage: build [-b] setup system [rootdev] [> image]"); +} + +int main(int argc, char ** argv) +{ + unsigned int i, sz, setup_sectors; + int c; + u32 sys_size; + u8 major_root, minor_root; + struct stat sb; + FILE *file; + int fd; + void *kernel; + + if (argc > 2 && !strcmp(argv[1], "-b")) + { + is_big_kernel = 1; + argc--, argv++; + } + if ((argc < 3) || (argc > 4)) + usage(); + if (argc > 3) { + if (!strcmp(argv[3], "CURRENT")) { + if (stat("/", &sb)) { + perror("/"); + die("Couldn't stat /"); + } + major_root = major(sb.st_dev); + minor_root = minor(sb.st_dev); + } else if (strcmp(argv[3], "FLOPPY")) { + if (stat(argv[3], &sb)) { + perror(argv[3]); + die("Couldn't stat root device."); + } + major_root = major(sb.st_rdev); + minor_root = minor(sb.st_rdev); + } else { + major_root = 0; + minor_root = 0; + } + } else { + major_root = DEFAULT_MAJOR_ROOT; + minor_root = DEFAULT_MINOR_ROOT; + } + fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root); + + /* Copy the setup code */ + file = fopen(argv[1], "r"); + if (!file) + die("Unable to open `%s': %m", argv[1]); + c = fread(buf, 1, sizeof(buf), file); + if (ferror(file)) + die("read-error on `setup'"); + if (c < 1024) + die("The setup must be at least 1024 bytes"); + if (buf[510] != 0x55 || buf[511] != 0xaa) + die("Boot block hasn't got boot flag (0xAA55)"); + fclose(file); + + /* Pad unused space with zeros */ + setup_sectors = (c + 511) / 512; + if (setup_sectors < SETUP_SECT_MIN) + setup_sectors = SETUP_SECT_MIN; + i = setup_sectors*512; + memset(buf+c, 0, i-c); + + /* Set the default root device */ + buf[508] = minor_root; + buf[509] = major_root; + + fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i); + + /* Open and stat the kernel file */ + fd = open(argv[2], O_RDONLY); + if (fd < 0) + die("Unable to open `%s': %m", argv[2]); + if (fstat(fd, &sb)) + die("Unable to stat `%s': %m", argv[2]); + sz = sb.st_size; + fprintf (stderr, "System is %d kB\n", (sz+1023)/1024); + kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0); + if (kernel == MAP_FAILED) + die("Unable to mmap '%s': %m", argv[2]); + sys_size = (sz + 15) / 16; + if (!is_big_kernel && sys_size > DEF_SYSSIZE) + die("System is too big. Try using bzImage or modules."); + + /* Patch the setup code with the appropriate size parameters */ + buf[0x1f1] = setup_sectors-1; + buf[0x1f4] = sys_size; + buf[0x1f5] = sys_size >> 8; + buf[0x1f6] = sys_size >> 16; + buf[0x1f7] = sys_size >> 24; + + if (fwrite(buf, 1, i, stdout) != i) + die("Writing setup failed"); + + /* Copy the kernel code */ + if (fwrite(kernel, 1, sz, stdout) != sz) + die("Writing kernel failed"); + close(fd); + + /* Everything is OK */ + return 0; +} diff --git a/arch/x86/boot/tty.c b/arch/x86/boot/tty.c new file mode 100644 index 00000000000..f3f14bd2637 --- /dev/null +++ b/arch/x86/boot/tty.c @@ -0,0 +1,112 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/tty.c + * + * Very simple screen I/O + * XXX: Probably should add very simple serial I/O? + */ + +#include "boot.h" + +/* + * These functions are in .inittext so they can be used to signal + * error during initialization. + */ + +void __attribute__((section(".inittext"))) putchar(int ch) +{ + unsigned char c = ch; + + if (c == '\n') + putchar('\r'); /* \n -> \r\n */ + + /* int $0x10 is known to have bugs involving touching registers + it shouldn't. Be extra conservative... */ + asm volatile("pushal; pushw %%ds; int $0x10; popw %%ds; popal" + : : "b" (0x0007), "c" (0x0001), "a" (0x0e00|ch)); +} + +void __attribute__((section(".inittext"))) puts(const char *str) +{ + int n = 0; + while (*str) { + putchar(*str++); + n++; + } +} + +/* + * Read the CMOS clock through the BIOS, and return the + * seconds in BCD. + */ + +static u8 gettime(void) +{ + u16 ax = 0x0200; + u16 cx, dx; + + asm volatile("int $0x1a" + : "+a" (ax), "=c" (cx), "=d" (dx) + : : "ebx", "esi", "edi"); + + return dx >> 8; +} + +/* + * Read from the keyboard + */ +int getchar(void) +{ + u16 ax = 0; + asm volatile("int $0x16" : "+a" (ax)); + + return ax & 0xff; +} + +static int kbd_pending(void) +{ + u8 pending; + asm volatile("int $0x16; setnz %0" + : "=rm" (pending) + : "a" (0x0100)); + return pending; +} + +void kbd_flush(void) +{ + for (;;) { + if (!kbd_pending()) + break; + getchar(); + } +} + +int getchar_timeout(void) +{ + int cnt = 30; + int t0, t1; + + t0 = gettime(); + + while (cnt) { + if (kbd_pending()) + return getchar(); + + t1 = gettime(); + if (t0 != t1) { + cnt--; + t0 = t1; + } + } + + return 0; /* Timeout! */ +} diff --git a/arch/x86/boot/version.c b/arch/x86/boot/version.c new file mode 100644 index 00000000000..c61462f7d9a --- /dev/null +++ b/arch/x86/boot/version.c @@ -0,0 +1,23 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/version.c + * + * Kernel version string + */ + +#include "boot.h" +#include <linux/utsrelease.h> +#include <linux/compile.h> + +const char kernel_version[] = + UTS_RELEASE " (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ") " + UTS_VERSION; diff --git a/arch/x86/boot/vesa.h b/arch/x86/boot/vesa.h new file mode 100644 index 00000000000..ff5b73cd406 --- /dev/null +++ b/arch/x86/boot/vesa.h @@ -0,0 +1,79 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 1999-2007 H. Peter Anvin - All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, Inc., 53 Temple Place Ste 330, + * Boston MA 02111-1307, USA; either version 2 of the License, or + * (at your option) any later version; incorporated herein by reference. + * + * ----------------------------------------------------------------------- */ + +#ifndef BOOT_VESA_H +#define BOOT_VESA_H + +typedef struct { + u16 off, seg; +} far_ptr; + +/* VESA General Information table */ +struct vesa_general_info { + u32 signature; /* 0 Magic number = "VESA" */ + u16 version; /* 4 */ + far_ptr vendor_string; /* 6 */ + u32 capabilities; /* 10 */ + far_ptr video_mode_ptr; /* 14 */ + u16 total_memory; /* 18 */ + + u16 oem_software_rev; /* 20 */ + far_ptr oem_vendor_name_ptr; /* 22 */ + far_ptr oem_product_name_ptr; /* 26 */ + far_ptr oem_product_rev_ptr; /* 30 */ + + u8 reserved[222]; /* 34 */ + u8 oem_data[256]; /* 256 */ +} __attribute__ ((packed)); + +#define VESA_MAGIC ('V' + ('E' << 8) + ('S' << 16) + ('A' << 24)) +#define VBE2_MAGIC ('V' + ('B' << 8) + ('E' << 16) + ('2' << 24)) + +struct vesa_mode_info { + u16 mode_attr; /* 0 */ + u8 win_attr[2]; /* 2 */ + u16 win_grain; /* 4 */ + u16 win_size; /* 6 */ + u16 win_seg[2]; /* 8 */ + far_ptr win_scheme; /* 12 */ + u16 logical_scan; /* 16 */ + + u16 h_res; /* 18 */ + u16 v_res; /* 20 */ + u8 char_width; /* 22 */ + u8 char_height; /* 23 */ + u8 memory_planes; /* 24 */ + u8 bpp; /* 25 */ + u8 banks; /* 26 */ + u8 memory_layout; /* 27 */ + u8 bank_size; /* 28 */ + u8 image_planes; /* 29 */ + u8 page_function; /* 30 */ + + u8 rmask; /* 31 */ + u8 rpos; /* 32 */ + u8 gmask; /* 33 */ + u8 gpos; /* 34 */ + u8 bmask; /* 35 */ + u8 bpos; /* 36 */ + u8 resv_mask; /* 37 */ + u8 resv_pos; /* 38 */ + u8 dcm_info; /* 39 */ + + u32 lfb_ptr; /* 40 Linear frame buffer address */ + u32 offscreen_ptr; /* 44 Offscreen memory address */ + u16 offscreen_size; /* 48 */ + + u8 reserved[206]; /* 50 */ +} __attribute__ ((packed)); + +#endif /* LIB_SYS_VESA_H */ diff --git a/arch/x86/boot/video-bios.c b/arch/x86/boot/video-bios.c new file mode 100644 index 00000000000..68e65d95cdf --- /dev/null +++ b/arch/x86/boot/video-bios.c @@ -0,0 +1,125 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/video-bios.c + * + * Standard video BIOS modes + * + * We have two options for this; silent and scanned. + */ + +#include "boot.h" +#include "video.h" + +__videocard video_bios; + +/* Set a conventional BIOS mode */ +static int set_bios_mode(u8 mode); + +static int bios_set_mode(struct mode_info *mi) +{ + return set_bios_mode(mi->mode - VIDEO_FIRST_BIOS); +} + +static int set_bios_mode(u8 mode) +{ + u16 ax; + u8 new_mode; + + ax = mode; /* AH=0x00 Set Video Mode */ + asm volatile(INT10 + : "+a" (ax) + : : "ebx", "ecx", "edx", "esi", "edi"); + + ax = 0x0f00; /* Get Current Video Mode */ + asm volatile(INT10 + : "+a" (ax) + : : "ebx", "ecx", "edx", "esi", "edi"); + + do_restore = 1; /* Assume video contents were lost */ + new_mode = ax & 0x7f; /* Not all BIOSes are clean with the top bit */ + + if (new_mode == mode) + return 0; /* Mode change OK */ + + if (new_mode != boot_params.screen_info.orig_video_mode) { + /* Mode setting failed, but we didn't end up where we + started. That's bad. Try to revert to the original + video mode. */ + ax = boot_params.screen_info.orig_video_mode; + asm volatile(INT10 + : "+a" (ax) + : : "ebx", "ecx", "edx", "esi", "edi"); + } + return -1; +} + +static int bios_probe(void) +{ + u8 mode; + u8 saved_mode = boot_params.screen_info.orig_video_mode; + u16 crtc; + struct mode_info *mi; + int nmodes = 0; + + if (adapter != ADAPTER_EGA && adapter != ADAPTER_VGA) + return 0; + + set_fs(0); + crtc = vga_crtc(); + + video_bios.modes = GET_HEAP(struct mode_info, 0); + + for (mode = 0x14; mode <= 0x7f; mode++) { + if (heap_free() < sizeof(struct mode_info)) + break; + + if (mode_defined(VIDEO_FIRST_BIOS+mode)) + continue; + + if (set_bios_mode(mode)) + continue; + + /* Try to verify that it's a text mode. */ + + /* Attribute Controller: make graphics controller disabled */ + if (in_idx(0x3c0, 0x10) & 0x01) + continue; + + /* Graphics Controller: verify Alpha addressing enabled */ + if (in_idx(0x3ce, 0x06) & 0x01) + continue; + + /* CRTC cursor location low should be zero(?) */ + if (in_idx(crtc, 0x0f)) + continue; + + mi = GET_HEAP(struct mode_info, 1); + mi->mode = VIDEO_FIRST_BIOS+mode; + mi->x = rdfs16(0x44a); + mi->y = rdfs8(0x484)+1; + nmodes++; + } + + set_bios_mode(saved_mode); + + return nmodes; +} + +__videocard video_bios = +{ + .card_name = "BIOS (scanned)", + .probe = bios_probe, + .set_mode = bios_set_mode, + .unsafe = 1, + .xmode_first = VIDEO_FIRST_BIOS, + .xmode_n = 0x80, +}; diff --git a/arch/x86/boot/video-vesa.c b/arch/x86/boot/video-vesa.c new file mode 100644 index 00000000000..19219071071 --- /dev/null +++ b/arch/x86/boot/video-vesa.c @@ -0,0 +1,292 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/video-vesa.c + * + * VESA text modes + */ + +#include "boot.h" +#include "video.h" +#include "vesa.h" + +/* VESA information */ +static struct vesa_general_info vginfo; +static struct vesa_mode_info vminfo; + +__videocard video_vesa; + +static void vesa_store_mode_params_graphics(void); + +static int vesa_probe(void) +{ +#if defined(CONFIG_VIDEO_VESA) || defined(CONFIG_FIRMWARE_EDID) + u16 ax, cx, di; + u16 mode; + addr_t mode_ptr; + struct mode_info *mi; + int nmodes = 0; + + video_vesa.modes = GET_HEAP(struct mode_info, 0); + + vginfo.signature = VBE2_MAGIC; + + ax = 0x4f00; + di = (size_t)&vginfo; + asm(INT10 + : "+a" (ax), "+D" (di), "=m" (vginfo) + : : "ebx", "ecx", "edx", "esi"); + + if (ax != 0x004f || + vginfo.signature != VESA_MAGIC || + vginfo.version < 0x0102) + return 0; /* Not present */ +#endif /* CONFIG_VIDEO_VESA || CONFIG_FIRMWARE_EDID */ +#ifdef CONFIG_VIDEO_VESA + set_fs(vginfo.video_mode_ptr.seg); + mode_ptr = vginfo.video_mode_ptr.off; + + while ((mode = rdfs16(mode_ptr)) != 0xffff) { + mode_ptr += 2; + + if (heap_free() < sizeof(struct mode_info)) + break; /* Heap full, can't save mode info */ + + if (mode & ~0x1ff) + continue; + + memset(&vminfo, 0, sizeof vminfo); /* Just in case... */ + + ax = 0x4f01; + cx = mode; + di = (size_t)&vminfo; + asm(INT10 + : "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo) + : : "ebx", "edx", "esi"); + + if (ax != 0x004f) + continue; + + if ((vminfo.mode_attr & 0x15) == 0x05) { + /* Text Mode, TTY BIOS supported, + supported by hardware */ + mi = GET_HEAP(struct mode_info, 1); + mi->mode = mode + VIDEO_FIRST_VESA; + mi->x = vminfo.h_res; + mi->y = vminfo.v_res; + nmodes++; + } else if ((vminfo.mode_attr & 0x99) == 0x99) { +#ifdef CONFIG_FB + /* Graphics mode, color, linear frame buffer + supported -- register the mode but hide from + the menu. Only do this if framebuffer is + configured, however, otherwise the user will + be left without a screen. */ + mi = GET_HEAP(struct mode_info, 1); + mi->mode = mode + VIDEO_FIRST_VESA; + mi->x = mi->y = 0; + nmodes++; +#endif + } + } + + return nmodes; +#else + return 0; +#endif /* CONFIG_VIDEO_VESA */ +} + +static int vesa_set_mode(struct mode_info *mode) +{ + u16 ax, bx, cx, di; + int is_graphic; + u16 vesa_mode = mode->mode - VIDEO_FIRST_VESA; + + memset(&vminfo, 0, sizeof vminfo); /* Just in case... */ + + ax = 0x4f01; + cx = vesa_mode; + di = (size_t)&vminfo; + asm(INT10 + : "+a" (ax), "+c" (cx), "+D" (di), "=m" (vminfo) + : : "ebx", "edx", "esi"); + + if (ax != 0x004f) + return -1; + + if ((vminfo.mode_attr & 0x15) == 0x05) { + /* It's a supported text mode */ + is_graphic = 0; + } else if ((vminfo.mode_attr & 0x99) == 0x99) { + /* It's a graphics mode with linear frame buffer */ + is_graphic = 1; + vesa_mode |= 0x4000; /* Request linear frame buffer */ + } else { + return -1; /* Invalid mode */ + } + + + ax = 0x4f02; + bx = vesa_mode; + di = 0; + asm volatile(INT10 + : "+a" (ax), "+b" (bx), "+D" (di) + : : "ecx", "edx", "esi"); + + if (ax != 0x004f) + return -1; + + graphic_mode = is_graphic; + if (!is_graphic) { + /* Text mode */ + force_x = mode->x; + force_y = mode->y; + do_restore = 1; + } else { + /* Graphics mode */ + vesa_store_mode_params_graphics(); + } + + return 0; +} + + +/* Switch DAC to 8-bit mode */ +static void vesa_dac_set_8bits(void) +{ + u8 dac_size = 6; + + /* If possible, switch the DAC to 8-bit mode */ + if (vginfo.capabilities & 1) { + u16 ax, bx; + + ax = 0x4f08; + bx = 0x0800; + asm volatile(INT10 + : "+a" (ax), "+b" (bx) + : : "ecx", "edx", "esi", "edi"); + + if (ax == 0x004f) + dac_size = bx >> 8; + } + + /* Set the color sizes to the DAC size, and offsets to 0 */ + boot_params.screen_info.red_size = dac_size; + boot_params.screen_info.green_size = dac_size; + boot_params.screen_info.blue_size = dac_size; + boot_params.screen_info.rsvd_size = dac_size; + + boot_params.screen_info.red_pos = 0; + boot_params.screen_info.green_pos = 0; + boot_params.screen_info.blue_pos = 0; + boot_params.screen_info.rsvd_pos = 0; +} + +/* Save the VESA protected mode info */ +static void vesa_store_pm_info(void) +{ + u16 ax, bx, di, es; + + ax = 0x4f0a; + bx = di = 0; + asm("pushw %%es; "INT10"; movw %%es,%0; popw %%es" + : "=d" (es), "+a" (ax), "+b" (bx), "+D" (di) + : : "ecx", "esi"); + + if (ax != 0x004f) + return; + + boot_params.screen_info.vesapm_seg = es; + boot_params.screen_info.vesapm_off = di; +} + +/* + * Save video mode parameters for graphics mode + */ +static void vesa_store_mode_params_graphics(void) +{ + /* Tell the kernel we're in VESA graphics mode */ + boot_params.screen_info.orig_video_isVGA = 0x23; + + /* Mode parameters */ + boot_params.screen_info.vesa_attributes = vminfo.mode_attr; + boot_params.screen_info.lfb_linelength = vminfo.logical_scan; + boot_params.screen_info.lfb_width = vminfo.h_res; + boot_params.screen_info.lfb_height = vminfo.v_res; + boot_params.screen_info.lfb_depth = vminfo.bpp; + boot_params.screen_info.pages = vminfo.image_planes; + boot_params.screen_info.lfb_base = vminfo.lfb_ptr; + memcpy(&boot_params.screen_info.red_size, + &vminfo.rmask, 8); + + /* General parameters */ + boot_params.screen_info.lfb_size = vginfo.total_memory; + + if (vminfo.bpp <= 8) + vesa_dac_set_8bits(); + + vesa_store_pm_info(); +} + +/* + * Save EDID information for the kernel; this is invoked, separately, + * after mode-setting. + */ +void vesa_store_edid(void) +{ +#ifdef CONFIG_FIRMWARE_EDID + u16 ax, bx, cx, dx, di; + + /* Apparently used as a nonsense token... */ + memset(&boot_params.edid_info, 0x13, sizeof boot_params.edid_info); + + if (vginfo.version < 0x0200) + return; /* EDID requires VBE 2.0+ */ + + ax = 0x4f15; /* VBE DDC */ + bx = 0x0000; /* Report DDC capabilities */ + cx = 0; /* Controller 0 */ + di = 0; /* ES:DI must be 0 by spec */ + + /* Note: The VBE DDC spec is different from the main VESA spec; + we genuinely have to assume all registers are destroyed here. */ + + asm("pushw %%es; movw %2,%%es; "INT10"; popw %%es" + : "+a" (ax), "+b" (bx) + : "c" (cx), "D" (di) + : "esi"); + + if (ax != 0x004f) + return; /* No EDID */ + + /* BH = time in seconds to transfer EDD information */ + /* BL = DDC level supported */ + + ax = 0x4f15; /* VBE DDC */ + bx = 0x0001; /* Read EDID */ + cx = 0; /* Controller 0 */ + dx = 0; /* EDID block number */ + di =(size_t) &boot_params.edid_info; /* (ES:)Pointer to block */ + asm(INT10 + : "+a" (ax), "+b" (bx), "+d" (dx), "=m" (boot_params.edid_info) + : "c" (cx), "D" (di) + : "esi"); +#endif /* CONFIG_FIRMWARE_EDID */ +} + +__videocard video_vesa = +{ + .card_name = "VESA", + .probe = vesa_probe, + .set_mode = vesa_set_mode, + .xmode_first = VIDEO_FIRST_VESA, + .xmode_n = 0x200, +}; diff --git a/arch/x86/boot/video-vga.c b/arch/x86/boot/video-vga.c new file mode 100644 index 00000000000..aef02f9ec0c --- /dev/null +++ b/arch/x86/boot/video-vga.c @@ -0,0 +1,261 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/video-vga.c + * + * Common all-VGA modes + */ + +#include "boot.h" +#include "video.h" + +static struct mode_info vga_modes[] = { + { VIDEO_80x25, 80, 25 }, + { VIDEO_8POINT, 80, 50 }, + { VIDEO_80x43, 80, 43 }, + { VIDEO_80x28, 80, 28 }, + { VIDEO_80x30, 80, 30 }, + { VIDEO_80x34, 80, 34 }, + { VIDEO_80x60, 80, 60 }, +}; + +static struct mode_info ega_modes[] = { + { VIDEO_80x25, 80, 25 }, + { VIDEO_8POINT, 80, 43 }, +}; + +static struct mode_info cga_modes[] = { + { VIDEO_80x25, 80, 25 }, +}; + +__videocard video_vga; + +/* Set basic 80x25 mode */ +static u8 vga_set_basic_mode(void) +{ + u16 ax; + u8 rows; + u8 mode; + +#ifdef CONFIG_VIDEO_400_HACK + if (adapter >= ADAPTER_VGA) { + asm volatile(INT10 + : : "a" (0x1202), "b" (0x0030) + : "ecx", "edx", "esi", "edi"); + } +#endif + + ax = 0x0f00; + asm volatile(INT10 + : "+a" (ax) + : : "ebx", "ecx", "edx", "esi", "edi"); + + mode = (u8)ax; + + set_fs(0); + rows = rdfs8(0x484); /* rows minus one */ + +#ifndef CONFIG_VIDEO_400_HACK + if ((ax == 0x5003 || ax == 0x5007) && + (rows == 0 || rows == 24)) + return mode; +#endif + + if (mode != 3 && mode != 7) + mode = 3; + + /* Set the mode */ + ax = mode; + asm volatile(INT10 + : "+a" (ax) + : : "ebx", "ecx", "edx", "esi", "edi"); + do_restore = 1; + return mode; +} + +static void vga_set_8font(void) +{ + /* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */ + + /* Set 8x8 font */ + asm volatile(INT10 : : "a" (0x1112), "b" (0)); + + /* Use alternate print screen */ + asm volatile(INT10 : : "a" (0x1200), "b" (0x20)); + + /* Turn off cursor emulation */ + asm volatile(INT10 : : "a" (0x1201), "b" (0x34)); + + /* Cursor is scan lines 6-7 */ + asm volatile(INT10 : : "a" (0x0100), "c" (0x0607)); +} + +static void vga_set_14font(void) +{ + /* Set 9x14 font - 80x28 on VGA */ + + /* Set 9x14 font */ + asm volatile(INT10 : : "a" (0x1111), "b" (0)); + + /* Turn off cursor emulation */ + asm volatile(INT10 : : "a" (0x1201), "b" (0x34)); + + /* Cursor is scan lines 11-12 */ + asm volatile(INT10 : : "a" (0x0100), "c" (0x0b0c)); +} + +static void vga_set_80x43(void) +{ + /* Set 80x43 mode on VGA (not EGA) */ + + /* Set 350 scans */ + asm volatile(INT10 : : "a" (0x1201), "b" (0x30)); + + /* Reset video mode */ + asm volatile(INT10 : : "a" (0x0003)); + + vga_set_8font(); +} + +/* I/O address of the VGA CRTC */ +u16 vga_crtc(void) +{ + return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4; +} + +static void vga_set_480_scanlines(int end) +{ + u16 crtc; + u8 csel; + + crtc = vga_crtc(); + + out_idx(0x0c, crtc, 0x11); /* Vertical sync end, unlock CR0-7 */ + out_idx(0x0b, crtc, 0x06); /* Vertical total */ + out_idx(0x3e, crtc, 0x07); /* Vertical overflow */ + out_idx(0xea, crtc, 0x10); /* Vertical sync start */ + out_idx(end, crtc, 0x12); /* Vertical display end */ + out_idx(0xe7, crtc, 0x15); /* Vertical blank start */ + out_idx(0x04, crtc, 0x16); /* Vertical blank end */ + csel = inb(0x3cc); + csel &= 0x0d; + csel |= 0xe2; + outb(csel, 0x3cc); +} + +static void vga_set_80x30(void) +{ + vga_set_480_scanlines(0xdf); +} + +static void vga_set_80x34(void) +{ + vga_set_14font(); + vga_set_480_scanlines(0xdb); +} + +static void vga_set_80x60(void) +{ + vga_set_8font(); + vga_set_480_scanlines(0xdf); +} + +static int vga_set_mode(struct mode_info *mode) +{ + /* Set the basic mode */ + vga_set_basic_mode(); + + /* Override a possibly broken BIOS */ + force_x = mode->x; + force_y = mode->y; + + switch (mode->mode) { + case VIDEO_80x25: + break; + case VIDEO_8POINT: + vga_set_8font(); + break; + case VIDEO_80x43: + vga_set_80x43(); + break; + case VIDEO_80x28: + vga_set_14font(); + break; + case VIDEO_80x30: + vga_set_80x30(); + break; + case VIDEO_80x34: + vga_set_80x34(); + break; + case VIDEO_80x60: + vga_set_80x60(); + break; + } + + return 0; +} + +/* + * Note: this probe includes basic information required by all + * systems. It should be executed first, by making sure + * video-vga.c is listed first in the Makefile. + */ +static int vga_probe(void) +{ + static const char *card_name[] = { + "CGA/MDA/HGC", "EGA", "VGA" + }; + static struct mode_info *mode_lists[] = { + cga_modes, + ega_modes, + vga_modes, + }; + static int mode_count[] = { + sizeof(cga_modes)/sizeof(struct mode_info), + sizeof(ega_modes)/sizeof(struct mode_info), + sizeof(vga_modes)/sizeof(struct mode_info), + }; + u8 vga_flag; + + asm(INT10 + : "=b" (boot_params.screen_info.orig_video_ega_bx) + : "a" (0x1200), "b" (0x10) /* Check EGA/VGA */ + : "ecx", "edx", "esi", "edi"); + + /* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */ + if ((u8)boot_params.screen_info.orig_video_ega_bx != 0x10) { + /* EGA/VGA */ + asm(INT10 + : "=a" (vga_flag) + : "a" (0x1a00) + : "ebx", "ecx", "edx", "esi", "edi"); + + if (vga_flag == 0x1a) { + adapter = ADAPTER_VGA; + boot_params.screen_info.orig_video_isVGA = 1; + } else { + adapter = ADAPTER_EGA; + } + } else { + adapter = ADAPTER_CGA; + } + + video_vga.modes = mode_lists[adapter]; + video_vga.card_name = card_name[adapter]; + return mode_count[adapter]; +} + +__videocard video_vga = +{ + .card_name = "VGA", + .probe = vga_probe, + .set_mode = vga_set_mode, +}; diff --git a/arch/x86/boot/video.c b/arch/x86/boot/video.c new file mode 100644 index 00000000000..e4ba897bf9a --- /dev/null +++ b/arch/x86/boot/video.c @@ -0,0 +1,467 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/video.c + * + * Select video mode + */ + +#include "boot.h" +#include "video.h" +#include "vesa.h" + +/* + * Mode list variables + */ +static struct card_info cards[]; /* List of cards to probe for */ + +/* + * Common variables + */ +int adapter; /* 0=CGA/MDA/HGC, 1=EGA, 2=VGA+ */ +u16 video_segment; +int force_x, force_y; /* Don't query the BIOS for cols/rows */ + +int do_restore = 0; /* Screen contents changed during mode flip */ +int graphic_mode; /* Graphic mode with linear frame buffer */ + +static void store_cursor_position(void) +{ + u16 curpos; + u16 ax, bx; + + ax = 0x0300; + bx = 0; + asm(INT10 + : "=d" (curpos), "+a" (ax), "+b" (bx) + : : "ecx", "esi", "edi"); + + boot_params.screen_info.orig_x = curpos; + boot_params.screen_info.orig_y = curpos >> 8; +} + +static void store_video_mode(void) +{ + u16 ax, page; + + /* N.B.: the saving of the video page here is a bit silly, + since we pretty much assume page 0 everywhere. */ + ax = 0x0f00; + asm(INT10 + : "+a" (ax), "=b" (page) + : : "ecx", "edx", "esi", "edi"); + + /* Not all BIOSes are clean with respect to the top bit */ + boot_params.screen_info.orig_video_mode = ax & 0x7f; + boot_params.screen_info.orig_video_page = page >> 8; +} + +/* + * Store the video mode parameters for later usage by the kernel. + * This is done by asking the BIOS except for the rows/columns + * parameters in the default 80x25 mode -- these are set directly, + * because some very obscure BIOSes supply insane values. + */ +static void store_mode_params(void) +{ + u16 font_size; + int x, y; + + /* For graphics mode, it is up to the mode-setting driver + (currently only video-vesa.c) to store the parameters */ + if (graphic_mode) + return; + + store_cursor_position(); + store_video_mode(); + + if (boot_params.screen_info.orig_video_mode == 0x07) { + /* MDA, HGC, or VGA in monochrome mode */ + video_segment = 0xb000; + } else { + /* CGA, EGA, VGA and so forth */ + video_segment = 0xb800; + } + + set_fs(0); + font_size = rdfs16(0x485); /* Font size, BIOS area */ + boot_params.screen_info.orig_video_points = font_size; + + x = rdfs16(0x44a); + y = (adapter == ADAPTER_CGA) ? 25 : rdfs8(0x484)+1; + + if (force_x) + x = force_x; + if (force_y) + y = force_y; + + boot_params.screen_info.orig_video_cols = x; + boot_params.screen_info.orig_video_lines = y; +} + +/* Probe the video drivers and have them generate their mode lists. */ +static void probe_cards(int unsafe) +{ + struct card_info *card; + static u8 probed[2]; + + if (probed[unsafe]) + return; + + probed[unsafe] = 1; + + for (card = video_cards; card < video_cards_end; card++) { + if (card->unsafe == unsafe) { + if (card->probe) + card->nmodes = card->probe(); + else + card->nmodes = 0; + } + } +} + +/* Test if a mode is defined */ +int mode_defined(u16 mode) +{ + struct card_info *card; + struct mode_info *mi; + int i; + + for (card = video_cards; card < video_cards_end; card++) { + mi = card->modes; + for (i = 0; i < card->nmodes; i++, mi++) { + if (mi->mode == mode) + return 1; + } + } + + return 0; +} + +/* Set mode (without recalc) */ +static int raw_set_mode(u16 mode, u16 *real_mode) +{ + int nmode, i; + struct card_info *card; + struct mode_info *mi; + + /* Drop the recalc bit if set */ + mode &= ~VIDEO_RECALC; + + /* Scan for mode based on fixed ID, position, or resolution */ + nmode = 0; + for (card = video_cards; card < video_cards_end; card++) { + mi = card->modes; + for (i = 0; i < card->nmodes; i++, mi++) { + int visible = mi->x || mi->y; + + if ((mode == nmode && visible) || + mode == mi->mode || + mode == (mi->y << 8)+mi->x) { + *real_mode = mi->mode; + return card->set_mode(mi); + } + + if (visible) + nmode++; + } + } + + /* Nothing found? Is it an "exceptional" (unprobed) mode? */ + for (card = video_cards; card < video_cards_end; card++) { + if (mode >= card->xmode_first && + mode < card->xmode_first+card->xmode_n) { + struct mode_info mix; + *real_mode = mix.mode = mode; + mix.x = mix.y = 0; + return card->set_mode(&mix); + } + } + + /* Otherwise, failure... */ + return -1; +} + +/* + * Recalculate the vertical video cutoff (hack!) + */ +static void vga_recalc_vertical(void) +{ + unsigned int font_size, rows; + u16 crtc; + u8 pt, ov; + + set_fs(0); + font_size = rdfs8(0x485); /* BIOS: font size (pixels) */ + rows = force_y ? force_y : rdfs8(0x484)+1; /* Text rows */ + + rows *= font_size; /* Visible scan lines */ + rows--; /* ... minus one */ + + crtc = vga_crtc(); + + pt = in_idx(crtc, 0x11); + pt &= ~0x80; /* Unlock CR0-7 */ + out_idx(pt, crtc, 0x11); + + out_idx((u8)rows, crtc, 0x12); /* Lower height register */ + + ov = in_idx(crtc, 0x07); /* Overflow register */ + ov &= 0xbd; + ov |= (rows >> (8-1)) & 0x02; + ov |= (rows >> (9-6)) & 0x40; + out_idx(ov, crtc, 0x07); +} + +/* Set mode (with recalc if specified) */ +static int set_mode(u16 mode) +{ + int rv; + u16 real_mode; + + /* Very special mode numbers... */ + if (mode == VIDEO_CURRENT_MODE) + return 0; /* Nothing to do... */ + else if (mode == NORMAL_VGA) + mode = VIDEO_80x25; + else if (mode == EXTENDED_VGA) + mode = VIDEO_8POINT; + + rv = raw_set_mode(mode, &real_mode); + if (rv) + return rv; + + if (mode & VIDEO_RECALC) + vga_recalc_vertical(); + + /* Save the canonical mode number for the kernel, not + an alias, size specification or menu position */ + boot_params.hdr.vid_mode = real_mode; + return 0; +} + +static unsigned int get_entry(void) +{ + char entry_buf[4]; + int i, len = 0; + int key; + unsigned int v; + + do { + key = getchar(); + + if (key == '\b') { + if (len > 0) { + puts("\b \b"); + len--; + } + } else if ((key >= '0' && key <= '9') || + (key >= 'A' && key <= 'Z') || + (key >= 'a' && key <= 'z')) { + if (len < sizeof entry_buf) { + entry_buf[len++] = key; + putchar(key); + } + } + } while (key != '\r'); + putchar('\n'); + + if (len == 0) + return VIDEO_CURRENT_MODE; /* Default */ + + v = 0; + for (i = 0; i < len; i++) { + v <<= 4; + key = entry_buf[i] | 0x20; + v += (key > '9') ? key-'a'+10 : key-'0'; + } + + return v; +} + +static void display_menu(void) +{ + struct card_info *card; + struct mode_info *mi; + char ch; + int i; + + puts("Mode: COLSxROWS:\n"); + + ch = '0'; + for (card = video_cards; card < video_cards_end; card++) { + mi = card->modes; + for (i = 0; i < card->nmodes; i++, mi++) { + int visible = mi->x && mi->y; + u16 mode_id = mi->mode ? mi->mode : + (mi->y << 8)+mi->x; + + if (!visible) + continue; /* Hidden mode */ + + printf("%c %04X %3dx%-3d %s\n", + ch, mode_id, mi->x, mi->y, card->card_name); + + if (ch == '9') + ch = 'a'; + else if (ch == 'z' || ch == ' ') + ch = ' '; /* Out of keys... */ + else + ch++; + } + } +} + +#define H(x) ((x)-'a'+10) +#define SCAN ((H('s')<<12)+(H('c')<<8)+(H('a')<<4)+H('n')) + +static unsigned int mode_menu(void) +{ + int key; + unsigned int sel; + + puts("Press <ENTER> to see video modes available, " + "<SPACE> to continue, or wait 30 sec\n"); + + kbd_flush(); + while (1) { + key = getchar_timeout(); + if (key == ' ' || key == 0) + return VIDEO_CURRENT_MODE; /* Default */ + if (key == '\r') + break; + putchar('\a'); /* Beep! */ + } + + + for (;;) { + display_menu(); + + puts("Enter a video mode or \"scan\" to scan for " + "additional modes: "); + sel = get_entry(); + if (sel != SCAN) + return sel; + + probe_cards(1); + } +} + +#ifdef CONFIG_VIDEO_RETAIN +/* Save screen content to the heap */ +struct saved_screen { + int x, y; + int curx, cury; + u16 *data; +} saved; + +static void save_screen(void) +{ + /* Should be called after store_mode_params() */ + saved.x = boot_params.screen_info.orig_video_cols; + saved.y = boot_params.screen_info.orig_video_lines; + saved.curx = boot_params.screen_info.orig_x; + saved.cury = boot_params.screen_info.orig_y; + + if (heap_free() < saved.x*saved.y*sizeof(u16)+512) + return; /* Not enough heap to save the screen */ + + saved.data = GET_HEAP(u16, saved.x*saved.y); + + set_fs(video_segment); + copy_from_fs(saved.data, 0, saved.x*saved.y*sizeof(u16)); +} + +static void restore_screen(void) +{ + /* Should be called after store_mode_params() */ + int xs = boot_params.screen_info.orig_video_cols; + int ys = boot_params.screen_info.orig_video_lines; + int y; + addr_t dst = 0; + u16 *src = saved.data; + u16 ax, bx, dx; + + if (graphic_mode) + return; /* Can't restore onto a graphic mode */ + + if (!src) + return; /* No saved screen contents */ + + /* Restore screen contents */ + + set_fs(video_segment); + for (y = 0; y < ys; y++) { + int npad; + + if (y < saved.y) { + int copy = (xs < saved.x) ? xs : saved.x; + copy_to_fs(dst, src, copy*sizeof(u16)); + dst += copy*sizeof(u16); + src += saved.x; + npad = (xs < saved.x) ? 0 : xs-saved.x; + } else { + npad = xs; + } + + /* Writes "npad" blank characters to + video_segment:dst and advances dst */ + asm volatile("pushw %%es ; " + "movw %2,%%es ; " + "shrw %%cx ; " + "jnc 1f ; " + "stosw \n\t" + "1: rep;stosl ; " + "popw %%es" + : "+D" (dst), "+c" (npad) + : "bdS" (video_segment), + "a" (0x07200720)); + } + + /* Restore cursor position */ + ax = 0x0200; /* Set cursor position */ + bx = 0; /* Page number (<< 8) */ + dx = (saved.cury << 8)+saved.curx; + asm volatile(INT10 + : "+a" (ax), "+b" (bx), "+d" (dx) + : : "ecx", "esi", "edi"); +} +#else +#define save_screen() ((void)0) +#define restore_screen() ((void)0) +#endif + +void set_video(void) +{ + u16 mode = boot_params.hdr.vid_mode; + + RESET_HEAP(); + + store_mode_params(); + save_screen(); + probe_cards(0); + + for (;;) { + if (mode == ASK_VGA) + mode = mode_menu(); + + if (!set_mode(mode)) + break; + + printf("Undefined video mode number: %x\n", mode); + mode = ASK_VGA; + } + vesa_store_edid(); + store_mode_params(); + + if (do_restore) + restore_screen(); +} diff --git a/arch/x86/boot/video.h b/arch/x86/boot/video.h new file mode 100644 index 00000000000..b92447d5121 --- /dev/null +++ b/arch/x86/boot/video.h @@ -0,0 +1,152 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/video.h + * + * Header file for the real-mode video probing code + */ + +#ifndef BOOT_VIDEO_H +#define BOOT_VIDEO_H + +#include <linux/types.h> + +/* Enable autodetection of SVGA adapters and modes. */ +#undef CONFIG_VIDEO_SVGA + +/* Enable autodetection of VESA modes */ +#define CONFIG_VIDEO_VESA + +/* Retain screen contents when switching modes */ +#define CONFIG_VIDEO_RETAIN + +/* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */ +#undef CONFIG_VIDEO_400_HACK + +/* This code uses an extended set of video mode numbers. These include: + * Aliases for standard modes + * NORMAL_VGA (-1) + * EXTENDED_VGA (-2) + * ASK_VGA (-3) + * Video modes numbered by menu position -- NOT RECOMMENDED because of lack + * of compatibility when extending the table. These are between 0x00 and 0xff. + */ +#define VIDEO_FIRST_MENU 0x0000 + +/* Standard BIOS video modes (BIOS number + 0x0100) */ +#define VIDEO_FIRST_BIOS 0x0100 + +/* VESA BIOS video modes (VESA number + 0x0200) */ +#define VIDEO_FIRST_VESA 0x0200 + +/* Video7 special modes (BIOS number + 0x0900) */ +#define VIDEO_FIRST_V7 0x0900 + +/* Special video modes */ +#define VIDEO_FIRST_SPECIAL 0x0f00 +#define VIDEO_80x25 0x0f00 +#define VIDEO_8POINT 0x0f01 +#define VIDEO_80x43 0x0f02 +#define VIDEO_80x28 0x0f03 +#define VIDEO_CURRENT_MODE 0x0f04 +#define VIDEO_80x30 0x0f05 +#define VIDEO_80x34 0x0f06 +#define VIDEO_80x60 0x0f07 +#define VIDEO_GFX_HACK 0x0f08 +#define VIDEO_LAST_SPECIAL 0x0f09 + +/* Video modes given by resolution */ +#define VIDEO_FIRST_RESOLUTION 0x1000 + +/* The "recalculate timings" flag */ +#define VIDEO_RECALC 0x8000 + +/* Define DO_STORE according to CONFIG_VIDEO_RETAIN */ +#ifdef CONFIG_VIDEO_RETAIN +void store_screen(void); +#define DO_STORE() store_screen() +#else +#define DO_STORE() ((void)0) +#endif /* CONFIG_VIDEO_RETAIN */ + +/* + * Mode table structures + */ + +struct mode_info { + u16 mode; /* Mode number (vga= style) */ + u8 x, y; /* Width, height */ +}; + +struct card_info { + const char *card_name; + int (*set_mode)(struct mode_info *mode); + int (*probe)(void); + struct mode_info *modes; + int nmodes; /* Number of probed modes so far */ + int unsafe; /* Probing is unsafe, only do after "scan" */ + u16 xmode_first; /* Unprobed modes to try to call anyway */ + u16 xmode_n; /* Size of unprobed mode range */ +}; + +#define __videocard struct card_info __attribute__((section(".videocards"))) +extern struct card_info video_cards[], video_cards_end[]; + +int mode_defined(u16 mode); /* video.c */ + +/* Basic video information */ +#define ADAPTER_CGA 0 /* CGA/MDA/HGC */ +#define ADAPTER_EGA 1 +#define ADAPTER_VGA 2 + +extern int adapter; +extern u16 video_segment; +extern int force_x, force_y; /* Don't query the BIOS for cols/rows */ +extern int do_restore; /* Restore screen contents */ +extern int graphic_mode; /* Graphics mode with linear frame buffer */ + +/* + * int $0x10 is notorious for touching registers it shouldn't. + * gcc doesn't like %ebp being clobbered, so define it as a push/pop + * sequence here. + * + * A number of systems, including the original PC can clobber %bp in + * certain circumstances, like when scrolling. There exists at least + * one Trident video card which could clobber DS under a set of + * circumstances that we are unlikely to encounter (scrolling when + * using an extended graphics mode of more than 800x600 pixels), but + * it's cheap insurance to deal with that here. + */ +#define INT10 "pushl %%ebp; pushw %%ds; int $0x10; popw %%ds; popl %%ebp" + +/* Accessing VGA indexed registers */ +static inline u8 in_idx(u16 port, u8 index) +{ + outb(index, port); + return inb(port+1); +} + +static inline void out_idx(u8 v, u16 port, u8 index) +{ + outw(index+(v << 8), port); +} + +/* Writes a value to an indexed port and then reads the port again */ +static inline u8 tst_idx(u8 v, u16 port, u8 index) +{ + out_idx(port, index, v); + return in_idx(port, index); +} + +/* Get the I/O port of the VGA CRTC */ +u16 vga_crtc(void); /* video-vga.c */ + +#endif /* BOOT_VIDEO_H */ diff --git a/arch/x86/boot/voyager.c b/arch/x86/boot/voyager.c new file mode 100644 index 00000000000..61c8fe0453b --- /dev/null +++ b/arch/x86/boot/voyager.c @@ -0,0 +1,46 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/voyager.c + * + * Get the Voyager config information + */ + +#include "boot.h" + +#ifdef CONFIG_X86_VOYAGER + +int query_voyager(void) +{ + u8 err; + u16 es, di; + /* Abuse the apm_bios_info area for this */ + u8 *data_ptr = (u8 *)&boot_params.apm_bios_info; + + data_ptr[0] = 0xff; /* Flag on config not found(?) */ + + asm("pushw %%es ; " + "int $0x15 ; " + "setc %0 ; " + "movw %%es, %1 ; " + "popw %%es" + : "=q" (err), "=r" (es), "=D" (di) + : "a" (0xffc0)); + + if (err) + return -1; /* Not Voyager */ + + set_fs(es); + copy_from_fs(data_ptr, di, 7); /* Table is 7 bytes apparently */ + return 0; +} + +#endif /* CONFIG_X86_VOYAGER */ |