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-rw-r--r--arch/s390/kernel/setup.c632
1 files changed, 632 insertions, 0 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
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+++ b/arch/s390/kernel/setup.c
@@ -0,0 +1,632 @@
+/*
+ * arch/s390/kernel/setup.c
+ *
+ * S390 version
+ * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Hartmut Penner (hp@de.ibm.com),
+ * Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * Derived from "arch/i386/kernel/setup.c"
+ * Copyright (C) 1995, Linus Torvalds
+ */
+
+/*
+ * This file handles the architecture-dependent parts of initialization
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/initrd.h>
+#include <linux/bootmem.h>
+#include <linux/root_dev.h>
+#include <linux/console.h>
+#include <linux/seq_file.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/smp.h>
+#include <asm/mmu_context.h>
+#include <asm/cpcmd.h>
+#include <asm/lowcore.h>
+#include <asm/irq.h>
+
+/*
+ * Machine setup..
+ */
+unsigned int console_mode = 0;
+unsigned int console_devno = -1;
+unsigned int console_irq = -1;
+unsigned long memory_size = 0;
+unsigned long machine_flags = 0;
+unsigned int default_storage_key = 0;
+struct {
+ unsigned long addr, size, type;
+} memory_chunk[MEMORY_CHUNKS] = { { 0 } };
+#define CHUNK_READ_WRITE 0
+#define CHUNK_READ_ONLY 1
+volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
+
+/*
+ * Setup options
+ */
+extern int _text,_etext, _edata, _end;
+
+/*
+ * This is set up by the setup-routine at boot-time
+ * for S390 need to find out, what we have to setup
+ * using address 0x10400 ...
+ */
+
+#include <asm/setup.h>
+
+static char command_line[COMMAND_LINE_SIZE] = { 0, };
+
+static struct resource code_resource = {
+ .name = "Kernel code",
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
+};
+
+static struct resource data_resource = {
+ .name = "Kernel data",
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
+};
+
+/*
+ * cpu_init() initializes state that is per-CPU.
+ */
+void __devinit cpu_init (void)
+{
+ int addr = hard_smp_processor_id();
+
+ /*
+ * Store processor id in lowcore (used e.g. in timer_interrupt)
+ */
+ asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
+ S390_lowcore.cpu_data.cpu_addr = addr;
+
+ /*
+ * Force FPU initialization:
+ */
+ clear_thread_flag(TIF_USEDFPU);
+ clear_used_math();
+
+ atomic_inc(&init_mm.mm_count);
+ current->active_mm = &init_mm;
+ if (current->mm)
+ BUG();
+ enter_lazy_tlb(&init_mm, current);
+}
+
+/*
+ * VM halt and poweroff setup routines
+ */
+char vmhalt_cmd[128] = "";
+char vmpoff_cmd[128] = "";
+
+static inline void strncpy_skip_quote(char *dst, char *src, int n)
+{
+ int sx, dx;
+
+ dx = 0;
+ for (sx = 0; src[sx] != 0; sx++) {
+ if (src[sx] == '"') continue;
+ dst[dx++] = src[sx];
+ if (dx >= n) break;
+ }
+}
+
+static int __init vmhalt_setup(char *str)
+{
+ strncpy_skip_quote(vmhalt_cmd, str, 127);
+ vmhalt_cmd[127] = 0;
+ return 1;
+}
+
+__setup("vmhalt=", vmhalt_setup);
+
+static int __init vmpoff_setup(char *str)
+{
+ strncpy_skip_quote(vmpoff_cmd, str, 127);
+ vmpoff_cmd[127] = 0;
+ return 1;
+}
+
+__setup("vmpoff=", vmpoff_setup);
+
+/*
+ * condev= and conmode= setup parameter.
+ */
+
+static int __init condev_setup(char *str)
+{
+ int vdev;
+
+ vdev = simple_strtoul(str, &str, 0);
+ if (vdev >= 0 && vdev < 65536) {
+ console_devno = vdev;
+ console_irq = -1;
+ }
+ return 1;
+}
+
+__setup("condev=", condev_setup);
+
+static int __init conmode_setup(char *str)
+{
+#if defined(CONFIG_SCLP_CONSOLE)
+ if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
+ SET_CONSOLE_SCLP;
+#endif
+#if defined(CONFIG_TN3215_CONSOLE)
+ if (strncmp(str, "3215", 5) == 0)
+ SET_CONSOLE_3215;
+#endif
+#if defined(CONFIG_TN3270_CONSOLE)
+ if (strncmp(str, "3270", 5) == 0)
+ SET_CONSOLE_3270;
+#endif
+ return 1;
+}
+
+__setup("conmode=", conmode_setup);
+
+static void __init conmode_default(void)
+{
+ char query_buffer[1024];
+ char *ptr;
+
+ if (MACHINE_IS_VM) {
+ __cpcmd("QUERY CONSOLE", query_buffer, 1024);
+ console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
+ ptr = strstr(query_buffer, "SUBCHANNEL =");
+ console_irq = simple_strtoul(ptr + 13, NULL, 16);
+ __cpcmd("QUERY TERM", query_buffer, 1024);
+ ptr = strstr(query_buffer, "CONMODE");
+ /*
+ * Set the conmode to 3215 so that the device recognition
+ * will set the cu_type of the console to 3215. If the
+ * conmode is 3270 and we don't set it back then both
+ * 3215 and the 3270 driver will try to access the console
+ * device (3215 as console and 3270 as normal tty).
+ */
+ __cpcmd("TERM CONMODE 3215", NULL, 0);
+ if (ptr == NULL) {
+#if defined(CONFIG_SCLP_CONSOLE)
+ SET_CONSOLE_SCLP;
+#endif
+ return;
+ }
+ if (strncmp(ptr + 8, "3270", 4) == 0) {
+#if defined(CONFIG_TN3270_CONSOLE)
+ SET_CONSOLE_3270;
+#elif defined(CONFIG_TN3215_CONSOLE)
+ SET_CONSOLE_3215;
+#elif defined(CONFIG_SCLP_CONSOLE)
+ SET_CONSOLE_SCLP;
+#endif
+ } else if (strncmp(ptr + 8, "3215", 4) == 0) {
+#if defined(CONFIG_TN3215_CONSOLE)
+ SET_CONSOLE_3215;
+#elif defined(CONFIG_TN3270_CONSOLE)
+ SET_CONSOLE_3270;
+#elif defined(CONFIG_SCLP_CONSOLE)
+ SET_CONSOLE_SCLP;
+#endif
+ }
+ } else if (MACHINE_IS_P390) {
+#if defined(CONFIG_TN3215_CONSOLE)
+ SET_CONSOLE_3215;
+#elif defined(CONFIG_TN3270_CONSOLE)
+ SET_CONSOLE_3270;
+#endif
+ } else {
+#if defined(CONFIG_SCLP_CONSOLE)
+ SET_CONSOLE_SCLP;
+#endif
+ }
+}
+
+#ifdef CONFIG_SMP
+extern void machine_restart_smp(char *);
+extern void machine_halt_smp(void);
+extern void machine_power_off_smp(void);
+
+void (*_machine_restart)(char *command) = machine_restart_smp;
+void (*_machine_halt)(void) = machine_halt_smp;
+void (*_machine_power_off)(void) = machine_power_off_smp;
+#else
+/*
+ * Reboot, halt and power_off routines for non SMP.
+ */
+extern void reipl(unsigned long devno);
+static void do_machine_restart_nonsmp(char * __unused)
+{
+ if (MACHINE_IS_VM)
+ cpcmd ("IPL", NULL, 0);
+ else
+ reipl (0x10000 | S390_lowcore.ipl_device);
+}
+
+static void do_machine_halt_nonsmp(void)
+{
+ if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
+ cpcmd(vmhalt_cmd, NULL, 0);
+ signal_processor(smp_processor_id(), sigp_stop_and_store_status);
+}
+
+static void do_machine_power_off_nonsmp(void)
+{
+ if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
+ cpcmd(vmpoff_cmd, NULL, 0);
+ signal_processor(smp_processor_id(), sigp_stop_and_store_status);
+}
+
+void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
+void (*_machine_halt)(void) = do_machine_halt_nonsmp;
+void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
+#endif
+
+ /*
+ * Reboot, halt and power_off stubs. They just call _machine_restart,
+ * _machine_halt or _machine_power_off.
+ */
+
+void machine_restart(char *command)
+{
+ console_unblank();
+ _machine_restart(command);
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void machine_halt(void)
+{
+ console_unblank();
+ _machine_halt();
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void machine_power_off(void)
+{
+ console_unblank();
+ _machine_power_off();
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+/*
+ * Setup function called from init/main.c just after the banner
+ * was printed.
+ */
+extern char _pstart, _pend, _stext;
+
+void __init setup_arch(char **cmdline_p)
+{
+ unsigned long bootmap_size;
+ unsigned long memory_start, memory_end;
+ char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
+ unsigned long start_pfn, end_pfn;
+ static unsigned int smptrap=0;
+ unsigned long delay = 0;
+ struct _lowcore *lc;
+ int i;
+
+ if (smptrap)
+ return;
+ smptrap=1;
+
+ /*
+ * print what head.S has found out about the machine
+ */
+#ifndef CONFIG_ARCH_S390X
+ printk((MACHINE_IS_VM) ?
+ "We are running under VM (31 bit mode)\n" :
+ "We are running native (31 bit mode)\n");
+ printk((MACHINE_HAS_IEEE) ?
+ "This machine has an IEEE fpu\n" :
+ "This machine has no IEEE fpu\n");
+#else /* CONFIG_ARCH_S390X */
+ printk((MACHINE_IS_VM) ?
+ "We are running under VM (64 bit mode)\n" :
+ "We are running native (64 bit mode)\n");
+#endif /* CONFIG_ARCH_S390X */
+
+ ROOT_DEV = Root_RAM0;
+ memory_start = (unsigned long) &_end; /* fixit if use $CODELO etc*/
+#ifndef CONFIG_ARCH_S390X
+ memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */
+ /*
+ * We need some free virtual space to be able to do vmalloc.
+ * On a machine with 2GB memory we make sure that we have at
+ * least 128 MB free space for vmalloc.
+ */
+ if (memory_end > 1920*1024*1024)
+ memory_end = 1920*1024*1024;
+#else /* CONFIG_ARCH_S390X */
+ memory_end = memory_size & ~0x200000UL; /* detected in head.s */
+#endif /* CONFIG_ARCH_S390X */
+ init_mm.start_code = PAGE_OFFSET;
+ init_mm.end_code = (unsigned long) &_etext;
+ init_mm.end_data = (unsigned long) &_edata;
+ init_mm.brk = (unsigned long) &_end;
+
+ code_resource.start = (unsigned long) &_text;
+ code_resource.end = (unsigned long) &_etext - 1;
+ data_resource.start = (unsigned long) &_etext;
+ data_resource.end = (unsigned long) &_edata - 1;
+
+ /* Save unparsed command line copy for /proc/cmdline */
+ memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
+ saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
+
+ for (;;) {
+ /*
+ * "mem=XXX[kKmM]" sets memsize
+ */
+ if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
+ memory_end = simple_strtoul(from+4, &from, 0);
+ if ( *from == 'K' || *from == 'k' ) {
+ memory_end = memory_end << 10;
+ from++;
+ } else if ( *from == 'M' || *from == 'm' ) {
+ memory_end = memory_end << 20;
+ from++;
+ }
+ }
+ /*
+ * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
+ */
+ if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
+ delay = simple_strtoul(from+9, &from, 0);
+ if (*from == 's' || *from == 'S') {
+ delay = delay*1000000;
+ from++;
+ } else if (*from == 'm' || *from == 'M') {
+ delay = delay*60*1000000;
+ from++;
+ }
+ /* now wait for the requested amount of time */
+ udelay(delay);
+ }
+ cn = *(from++);
+ if (!cn)
+ break;
+ if (cn == '\n')
+ cn = ' '; /* replace newlines with space */
+ if (cn == 0x0d)
+ cn = ' '; /* replace 0x0d with space */
+ if (cn == ' ' && c == ' ')
+ continue; /* remove additional spaces */
+ c = cn;
+ if (to - command_line >= COMMAND_LINE_SIZE)
+ break;
+ *(to++) = c;
+ }
+ if (c == ' ' && to > command_line) to--;
+ *to = '\0';
+ *cmdline_p = command_line;
+
+ /*
+ * partially used pages are not usable - thus
+ * we are rounding upwards:
+ */
+ start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
+
+ /*
+ * Initialize the boot-time allocator (with low memory only):
+ */
+ bootmap_size = init_bootmem(start_pfn, end_pfn);
+
+ /*
+ * Register RAM areas with the bootmem allocator.
+ */
+ for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
+ unsigned long start_chunk, end_chunk;
+
+ if (memory_chunk[i].type != CHUNK_READ_WRITE)
+ continue;
+ start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
+ start_chunk >>= PAGE_SHIFT;
+ end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
+ end_chunk >>= PAGE_SHIFT;
+ if (start_chunk < start_pfn)
+ start_chunk = start_pfn;
+ if (end_chunk > end_pfn)
+ end_chunk = end_pfn;
+ if (start_chunk < end_chunk)
+ free_bootmem(start_chunk << PAGE_SHIFT,
+ (end_chunk - start_chunk) << PAGE_SHIFT);
+ }
+
+ /*
+ * Reserve the bootmem bitmap itself as well. We do this in two
+ * steps (first step was init_bootmem()) because this catches
+ * the (very unlikely) case of us accidentally initializing the
+ * bootmem allocator with an invalid RAM area.
+ */
+ reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (INITRD_START) {
+ if (INITRD_START + INITRD_SIZE <= memory_end) {
+ reserve_bootmem(INITRD_START, INITRD_SIZE);
+ initrd_start = INITRD_START;
+ initrd_end = initrd_start + INITRD_SIZE;
+ } else {
+ printk("initrd extends beyond end of memory "
+ "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
+ initrd_start + INITRD_SIZE, memory_end);
+ initrd_start = initrd_end = 0;
+ }
+ }
+#endif
+
+ for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
+ struct resource *res;
+
+ res = alloc_bootmem_low(sizeof(struct resource));
+ res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
+
+ switch (memory_chunk[i].type) {
+ case CHUNK_READ_WRITE:
+ res->name = "System RAM";
+ break;
+ case CHUNK_READ_ONLY:
+ res->name = "System ROM";
+ res->flags |= IORESOURCE_READONLY;
+ break;
+ default:
+ res->name = "reserved";
+ }
+ res->start = memory_chunk[i].addr;
+ res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
+ request_resource(&iomem_resource, res);
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
+ }
+
+ /*
+ * Setup lowcore for boot cpu
+ */
+#ifndef CONFIG_ARCH_S390X
+ lc = (struct _lowcore *) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
+ memset(lc, 0, PAGE_SIZE);
+#else /* CONFIG_ARCH_S390X */
+ lc = (struct _lowcore *) __alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0);
+ memset(lc, 0, 2*PAGE_SIZE);
+#endif /* CONFIG_ARCH_S390X */
+ lc->restart_psw.mask = PSW_BASE_BITS;
+ lc->restart_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
+ lc->external_new_psw.mask = PSW_KERNEL_BITS;
+ lc->external_new_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
+ lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
+ lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
+ lc->program_new_psw.mask = PSW_KERNEL_BITS;
+ lc->program_new_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
+ lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
+ lc->mcck_new_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
+ lc->io_new_psw.mask = PSW_KERNEL_BITS;
+ lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
+ lc->ipl_device = S390_lowcore.ipl_device;
+ lc->jiffy_timer = -1LL;
+ lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
+ lc->async_stack = (unsigned long)
+ __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
+#ifdef CONFIG_CHECK_STACK
+ lc->panic_stack = (unsigned long)
+ __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
+#endif
+ lc->current_task = (unsigned long) init_thread_union.thread_info.task;
+ lc->thread_info = (unsigned long) &init_thread_union;
+#ifdef CONFIG_ARCH_S390X
+ if (MACHINE_HAS_DIAG44)
+ lc->diag44_opcode = 0x83000044;
+ else
+ lc->diag44_opcode = 0x07000700;
+#endif /* CONFIG_ARCH_S390X */
+ set_prefix((u32)(unsigned long) lc);
+ cpu_init();
+ __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
+
+ /*
+ * Create kernel page tables and switch to virtual addressing.
+ */
+ paging_init();
+
+ /* Setup default console */
+ conmode_default();
+}
+
+void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
+{
+ printk("cpu %d "
+#ifdef CONFIG_SMP
+ "phys_idx=%d "
+#endif
+ "vers=%02X ident=%06X machine=%04X unused=%04X\n",
+ cpuinfo->cpu_nr,
+#ifdef CONFIG_SMP
+ cpuinfo->cpu_addr,
+#endif
+ cpuinfo->cpu_id.version,
+ cpuinfo->cpu_id.ident,
+ cpuinfo->cpu_id.machine,
+ cpuinfo->cpu_id.unused);
+}
+
+/*
+ * show_cpuinfo - Get information on one CPU for use by procfs.
+ */
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+ struct cpuinfo_S390 *cpuinfo;
+ unsigned long n = (unsigned long) v - 1;
+
+ if (!n) {
+ seq_printf(m, "vendor_id : IBM/S390\n"
+ "# processors : %i\n"
+ "bogomips per cpu: %lu.%02lu\n",
+ num_online_cpus(), loops_per_jiffy/(500000/HZ),
+ (loops_per_jiffy/(5000/HZ))%100);
+ }
+ if (cpu_online(n)) {
+#ifdef CONFIG_SMP
+ if (smp_processor_id() == n)
+ cpuinfo = &S390_lowcore.cpu_data;
+ else
+ cpuinfo = &lowcore_ptr[n]->cpu_data;
+#else
+ cpuinfo = &S390_lowcore.cpu_data;
+#endif
+ seq_printf(m, "processor %li: "
+ "version = %02X, "
+ "identification = %06X, "
+ "machine = %04X\n",
+ n, cpuinfo->cpu_id.version,
+ cpuinfo->cpu_id.ident,
+ cpuinfo->cpu_id.machine);
+ }
+ return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
+}
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return c_start(m, pos);
+}
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = show_cpuinfo,
+};
+
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