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-rw-r--r--arch/mips/kernel/setup.c571
1 files changed, 571 insertions, 0 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
new file mode 100644
index 00000000000..6018ca25ace
--- /dev/null
+++ b/arch/mips/kernel/setup.c
@@ -0,0 +1,571 @@
+/*
+ * 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 Linus Torvalds
+ * Copyright (C) 1995 Waldorf Electronics
+ * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
+ * Copyright (C) 1996 Stoned Elipot
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ * Copyright (C) 2000 2001, 2002 Maciej W. Rozycki
+ */
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/utsname.h>
+#include <linux/a.out.h>
+#include <linux/tty.h>
+#include <linux/bootmem.h>
+#include <linux/initrd.h>
+#include <linux/major.h>
+#include <linux/kdev_t.h>
+#include <linux/root_dev.h>
+#include <linux/highmem.h>
+#include <linux/console.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/system.h>
+
+struct cpuinfo_mips cpu_data[NR_CPUS];
+
+EXPORT_SYMBOL(cpu_data);
+
+#ifdef CONFIG_VT
+struct screen_info screen_info;
+#endif
+
+/*
+ * Despite it's name this variable is even if we don't have PCI
+ */
+unsigned int PCI_DMA_BUS_IS_PHYS;
+
+EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
+
+/*
+ * Setup information
+ *
+ * These are initialized so they are in the .data section
+ */
+unsigned long mips_machtype = MACH_UNKNOWN;
+unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
+
+EXPORT_SYMBOL(mips_machtype);
+EXPORT_SYMBOL(mips_machgroup);
+
+struct boot_mem_map boot_mem_map;
+
+static char command_line[CL_SIZE];
+ char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
+
+/*
+ * mips_io_port_base is the begin of the address space to which x86 style
+ * I/O ports are mapped.
+ */
+const unsigned long mips_io_port_base = -1;
+EXPORT_SYMBOL(mips_io_port_base);
+
+/*
+ * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
+ * for the processor.
+ */
+unsigned long isa_slot_offset;
+EXPORT_SYMBOL(isa_slot_offset);
+
+static struct resource code_resource = { .name = "Kernel code", };
+static struct resource data_resource = { .name = "Kernel data", };
+
+void __init add_memory_region(phys_t start, phys_t size, long type)
+{
+ int x = boot_mem_map.nr_map;
+ struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
+
+ /*
+ * Try to merge with previous entry if any. This is far less than
+ * perfect but is sufficient for most real world cases.
+ */
+ if (x && prev->addr + prev->size == start && prev->type == type) {
+ prev->size += size;
+ return;
+ }
+
+ if (x == BOOT_MEM_MAP_MAX) {
+ printk("Ooops! Too many entries in the memory map!\n");
+ return;
+ }
+
+ boot_mem_map.map[x].addr = start;
+ boot_mem_map.map[x].size = size;
+ boot_mem_map.map[x].type = type;
+ boot_mem_map.nr_map++;
+}
+
+static void __init print_memory_map(void)
+{
+ int i;
+ const int field = 2 * sizeof(unsigned long);
+
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ printk(" memory: %0*Lx @ %0*Lx ",
+ field, (unsigned long long) boot_mem_map.map[i].size,
+ field, (unsigned long long) boot_mem_map.map[i].addr);
+
+ switch (boot_mem_map.map[i].type) {
+ case BOOT_MEM_RAM:
+ printk("(usable)\n");
+ break;
+ case BOOT_MEM_ROM_DATA:
+ printk("(ROM data)\n");
+ break;
+ case BOOT_MEM_RESERVED:
+ printk("(reserved)\n");
+ break;
+ default:
+ printk("type %lu\n", boot_mem_map.map[i].type);
+ break;
+ }
+ }
+}
+
+static inline void parse_cmdline_early(void)
+{
+ char c = ' ', *to = command_line, *from = saved_command_line;
+ unsigned long start_at, mem_size;
+ int len = 0;
+ int usermem = 0;
+
+ printk("Determined physical RAM map:\n");
+ print_memory_map();
+
+ for (;;) {
+ /*
+ * "mem=XXX[kKmM]" defines a memory region from
+ * 0 to <XXX>, overriding the determined size.
+ * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
+ * <YYY> to <YYY>+<XXX>, overriding the determined size.
+ */
+ if (c == ' ' && !memcmp(from, "mem=", 4)) {
+ if (to != command_line)
+ to--;
+ /*
+ * If a user specifies memory size, we
+ * blow away any automatically generated
+ * size.
+ */
+ if (usermem == 0) {
+ boot_mem_map.nr_map = 0;
+ usermem = 1;
+ }
+ mem_size = memparse(from + 4, &from);
+ if (*from == '@')
+ start_at = memparse(from + 1, &from);
+ else
+ start_at = 0;
+ add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
+ }
+ c = *(from++);
+ if (!c)
+ break;
+ if (CL_SIZE <= ++len)
+ break;
+ *(to++) = c;
+ }
+ *to = '\0';
+
+ if (usermem) {
+ printk("User-defined physical RAM map:\n");
+ print_memory_map();
+ }
+}
+
+static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
+{
+ /*
+ * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
+ * "rd_size=0xNN" it's size
+ */
+ unsigned long start = 0;
+ unsigned long size = 0;
+ unsigned long end;
+ char cmd_line[CL_SIZE];
+ char *start_str;
+ char *size_str;
+ char *tmp;
+
+ strcpy(cmd_line, command_line);
+ *command_line = 0;
+ tmp = cmd_line;
+ /* Ignore "rd_start=" strings in other parameters. */
+ start_str = strstr(cmd_line, "rd_start=");
+ if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
+ start_str = strstr(start_str, " rd_start=");
+ while (start_str) {
+ if (start_str != cmd_line)
+ strncat(command_line, tmp, start_str - tmp);
+ start = memparse(start_str + 9, &start_str);
+ tmp = start_str + 1;
+ start_str = strstr(start_str, " rd_start=");
+ }
+ if (*tmp)
+ strcat(command_line, tmp);
+
+ strcpy(cmd_line, command_line);
+ *command_line = 0;
+ tmp = cmd_line;
+ /* Ignore "rd_size" strings in other parameters. */
+ size_str = strstr(cmd_line, "rd_size=");
+ if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
+ size_str = strstr(size_str, " rd_size=");
+ while (size_str) {
+ if (size_str != cmd_line)
+ strncat(command_line, tmp, size_str - tmp);
+ size = memparse(size_str + 8, &size_str);
+ tmp = size_str + 1;
+ size_str = strstr(size_str, " rd_size=");
+ }
+ if (*tmp)
+ strcat(command_line, tmp);
+
+#ifdef CONFIG_MIPS64
+ /* HACK: Guess if the sign extension was forgotten */
+ if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
+ start |= 0xffffffff00000000;
+#endif
+
+ end = start + size;
+ if (start && end) {
+ *rd_start = start;
+ *rd_end = end;
+ return 1;
+ }
+ return 0;
+}
+
+#define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
+#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
+#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
+
+#define MAXMEM HIGHMEM_START
+#define MAXMEM_PFN PFN_DOWN(MAXMEM)
+
+static inline void bootmem_init(void)
+{
+ unsigned long start_pfn;
+ unsigned long reserved_end = (unsigned long)&_end;
+#ifndef CONFIG_SGI_IP27
+ unsigned long first_usable_pfn;
+ unsigned long bootmap_size;
+ int i;
+#endif
+#ifdef CONFIG_BLK_DEV_INITRD
+ int initrd_reserve_bootmem = 0;
+
+ /* Board specific code should have set up initrd_start and initrd_end */
+ ROOT_DEV = Root_RAM0;
+ if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
+ reserved_end = max(reserved_end, initrd_end);
+ initrd_reserve_bootmem = 1;
+ } else {
+ unsigned long tmp;
+ u32 *initrd_header;
+
+ tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
+ if (tmp < reserved_end)
+ tmp += PAGE_SIZE;
+ initrd_header = (u32 *)tmp;
+ if (initrd_header[0] == 0x494E5244) {
+ initrd_start = (unsigned long)&initrd_header[2];
+ initrd_end = initrd_start + initrd_header[1];
+ reserved_end = max(reserved_end, initrd_end);
+ initrd_reserve_bootmem = 1;
+ }
+ }
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+ /*
+ * Partially used pages are not usable - thus
+ * we are rounding upwards.
+ */
+ start_pfn = PFN_UP(CPHYSADDR(reserved_end));
+
+#ifndef CONFIG_SGI_IP27
+ /* Find the highest page frame number we have available. */
+ max_pfn = 0;
+ first_usable_pfn = -1UL;
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ unsigned long start, end;
+
+ if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+ continue;
+
+ start = PFN_UP(boot_mem_map.map[i].addr);
+ end = PFN_DOWN(boot_mem_map.map[i].addr
+ + boot_mem_map.map[i].size);
+
+ if (start >= end)
+ continue;
+ if (end > max_pfn)
+ max_pfn = end;
+ if (start < first_usable_pfn) {
+ if (start > start_pfn) {
+ first_usable_pfn = start;
+ } else if (end > start_pfn) {
+ first_usable_pfn = start_pfn;
+ }
+ }
+ }
+
+ /*
+ * Determine low and high memory ranges
+ */
+ max_low_pfn = max_pfn;
+ if (max_low_pfn > MAXMEM_PFN) {
+ max_low_pfn = MAXMEM_PFN;
+#ifndef CONFIG_HIGHMEM
+ /* Maximum memory usable is what is directly addressable */
+ printk(KERN_WARNING "Warning only %ldMB will be used.\n",
+ MAXMEM >> 20);
+ printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
+#endif
+ }
+
+#ifdef CONFIG_HIGHMEM
+ /*
+ * Crude, we really should make a better attempt at detecting
+ * highstart_pfn
+ */
+ highstart_pfn = highend_pfn = max_pfn;
+ if (max_pfn > MAXMEM_PFN) {
+ highstart_pfn = MAXMEM_PFN;
+ printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+ (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
+ }
+#endif
+
+ /* Initialize the boot-time allocator with low memory only. */
+ bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
+
+ /*
+ * Register fully available low RAM pages with the bootmem allocator.
+ */
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ unsigned long curr_pfn, last_pfn, size;
+
+ /*
+ * Reserve usable memory.
+ */
+ if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+ continue;
+
+ /*
+ * We are rounding up the start address of usable memory:
+ */
+ curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
+ if (curr_pfn >= max_low_pfn)
+ continue;
+ if (curr_pfn < start_pfn)
+ curr_pfn = start_pfn;
+
+ /*
+ * ... and at the end of the usable range downwards:
+ */
+ last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
+ + boot_mem_map.map[i].size);
+
+ if (last_pfn > max_low_pfn)
+ last_pfn = max_low_pfn;
+
+ /*
+ * Only register lowmem part of lowmem segment with bootmem.
+ */
+ size = last_pfn - curr_pfn;
+ if (curr_pfn > PFN_DOWN(HIGHMEM_START))
+ continue;
+ if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
+ size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
+ if (!size)
+ continue;
+
+ /*
+ * ... finally, did all the rounding and playing
+ * around just make the area go away?
+ */
+ if (last_pfn <= curr_pfn)
+ continue;
+
+ /* Register lowmem ranges */
+ free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
+ }
+
+ /* Reserve the bootmap memory. */
+ reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
+#endif /* CONFIG_SGI_IP27 */
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ initrd_below_start_ok = 1;
+ if (initrd_start) {
+ unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
+ printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
+ (void *)initrd_start, initrd_size);
+
+ if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
+ printk("initrd extends beyond end of memory "
+ "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
+ sizeof(long) * 2,
+ (unsigned long long)CPHYSADDR(initrd_end),
+ sizeof(long) * 2,
+ (unsigned long long)PFN_PHYS(max_low_pfn));
+ initrd_start = initrd_end = 0;
+ initrd_reserve_bootmem = 0;
+ }
+
+ if (initrd_reserve_bootmem)
+ reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
+ }
+#endif /* CONFIG_BLK_DEV_INITRD */
+}
+
+static inline void resource_init(void)
+{
+ int i;
+
+#if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
+ /*
+ * The 64bit code in 32bit object format trick can't represent
+ * 64bit wide relocations for linker script symbols.
+ */
+ code_resource.start = CPHYSADDR(&_text);
+ code_resource.end = CPHYSADDR(&_etext) - 1;
+ data_resource.start = CPHYSADDR(&_etext);
+ data_resource.end = CPHYSADDR(&_edata) - 1;
+#else
+ code_resource.start = virt_to_phys(&_text);
+ code_resource.end = virt_to_phys(&_etext) - 1;
+ data_resource.start = virt_to_phys(&_etext);
+ data_resource.end = virt_to_phys(&_edata) - 1;
+#endif
+
+ /*
+ * Request address space for all standard RAM.
+ */
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ struct resource *res;
+ unsigned long start, end;
+
+ start = boot_mem_map.map[i].addr;
+ end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
+ if (start >= MAXMEM)
+ continue;
+ if (end >= MAXMEM)
+ end = MAXMEM - 1;
+
+ res = alloc_bootmem(sizeof(struct resource));
+ switch (boot_mem_map.map[i].type) {
+ case BOOT_MEM_RAM:
+ case BOOT_MEM_ROM_DATA:
+ res->name = "System RAM";
+ break;
+ case BOOT_MEM_RESERVED:
+ default:
+ res->name = "reserved";
+ }
+
+ res->start = start;
+ res->end = end;
+
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ request_resource(&iomem_resource, res);
+
+ /*
+ * We don't know which RAM region contains kernel data,
+ * so we try it repeatedly and let the resource manager
+ * test it.
+ */
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
+ }
+}
+
+#undef PFN_UP
+#undef PFN_DOWN
+#undef PFN_PHYS
+
+#undef MAXMEM
+#undef MAXMEM_PFN
+
+static int __initdata earlyinit_debug;
+
+static int __init earlyinit_debug_setup(char *str)
+{
+ earlyinit_debug = 1;
+ return 1;
+}
+__setup("earlyinit_debug", earlyinit_debug_setup);
+
+extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
+
+static void __init do_earlyinitcalls(void)
+{
+ initcall_t *call, *start, *end;
+
+ start = &__earlyinitcall_start;
+ end = &__earlyinitcall_end;
+
+ for (call = start; call < end; call++) {
+ if (earlyinit_debug)
+ printk("calling earlyinitcall 0x%p\n", *call);
+
+ (*call)();
+ }
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+ cpu_probe();
+ prom_init();
+ cpu_report();
+
+#if defined(CONFIG_VT)
+#if defined(CONFIG_VGA_CONSOLE)
+ conswitchp = &vga_con;
+#elif defined(CONFIG_DUMMY_CONSOLE)
+ conswitchp = &dummy_con;
+#endif
+#endif
+
+ /* call board setup routine */
+ do_earlyinitcalls();
+
+ strlcpy(command_line, arcs_cmdline, sizeof(command_line));
+ strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+
+ *cmdline_p = command_line;
+
+ parse_cmdline_early();
+ bootmem_init();
+ paging_init();
+ resource_init();
+}
+
+int __init fpu_disable(char *s)
+{
+ cpu_data[0].options &= ~MIPS_CPU_FPU;
+
+ return 1;
+}
+
+__setup("nofpu", fpu_disable);
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