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Diffstat (limited to 'cleopatre/linux-2.6.25.10-spc300/arch/s390/kernel/setup.c')
-rw-r--r--cleopatre/linux-2.6.25.10-spc300/arch/s390/kernel/setup.c928
1 files changed, 928 insertions, 0 deletions
diff --git a/cleopatre/linux-2.6.25.10-spc300/arch/s390/kernel/setup.c b/cleopatre/linux-2.6.25.10-spc300/arch/s390/kernel/setup.c
new file mode 100644
index 0000000000..290e504061
--- /dev/null
+++ b/cleopatre/linux-2.6.25.10-spc300/arch/s390/kernel/setup.c
@@ -0,0 +1,928 @@
+/*
+ * 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/tty.h>
+#include <linux/ioport.h>
+#include <linux/delay.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 <linux/device.h>
+#include <linux/notifier.h>
+#include <linux/pfn.h>
+#include <linux/ctype.h>
+#include <linux/reboot.h>
+
+#include <asm/ipl.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>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/sections.h>
+#include <asm/ebcdic.h>
+#include <asm/compat.h>
+
+long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
+ PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
+long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
+ PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
+
+/*
+ * User copy operations.
+ */
+struct uaccess_ops uaccess;
+EXPORT_SYMBOL(uaccess);
+
+/*
+ * Machine setup..
+ */
+unsigned int console_mode = 0;
+unsigned int console_devno = -1;
+unsigned int console_irq = -1;
+unsigned long machine_flags = 0;
+unsigned long elf_hwcap = 0;
+char elf_platform[ELF_PLATFORM_SIZE];
+
+struct mem_chunk __meminitdata memory_chunk[MEMORY_CHUNKS];
+volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
+static unsigned long __initdata memory_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 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 __cpuinit cpu_init(void)
+{
+ int addr = hard_smp_processor_id();
+
+ /*
+ * Store processor id in lowcore (used e.g. in timer_interrupt)
+ */
+ get_cpu_id(&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);
+}
+
+/*
+ * 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) || defined(CONFIG_SCLP_VT220_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, NULL);
+ 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, NULL);
+ 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, NULL);
+ if (ptr == NULL) {
+#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_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) || defined(CONFIG_SCLP_VT220_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) || defined(CONFIG_SCLP_VT220_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) || defined(CONFIG_SCLP_VT220_CONSOLE)
+ SET_CONSOLE_SCLP;
+#endif
+ }
+}
+
+#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
+static void __init setup_zfcpdump(unsigned int console_devno)
+{
+ static char str[64];
+
+ if (ipl_info.type != IPL_TYPE_FCP_DUMP)
+ return;
+ if (console_devno != -1)
+ sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
+ ipl_info.data.fcp.dev_id.devno, console_devno);
+ else
+ sprintf(str, "cio_ignore=all,!0.0.%04x",
+ ipl_info.data.fcp.dev_id.devno);
+ strcat(COMMAND_LINE, " ");
+ strcat(COMMAND_LINE, str);
+ console_loglevel = 2;
+}
+#else
+static inline void setup_zfcpdump(unsigned int console_devno) {}
+#endif /* CONFIG_ZFCPDUMP */
+
+ /*
+ * Reboot, halt and power_off stubs. They just call _machine_restart,
+ * _machine_halt or _machine_power_off.
+ */
+
+void machine_restart(char *command)
+{
+ if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
+ /*
+ * Only unblank the console if we are called in enabled
+ * context or a bust_spinlocks cleared the way for us.
+ */
+ console_unblank();
+ _machine_restart(command);
+}
+
+void machine_halt(void)
+{
+ if (!in_interrupt() || oops_in_progress)
+ /*
+ * Only unblank the console if we are called in enabled
+ * context or a bust_spinlocks cleared the way for us.
+ */
+ console_unblank();
+ _machine_halt();
+}
+
+void machine_power_off(void)
+{
+ if (!in_interrupt() || oops_in_progress)
+ /*
+ * Only unblank the console if we are called in enabled
+ * context or a bust_spinlocks cleared the way for us.
+ */
+ console_unblank();
+ _machine_power_off();
+}
+
+/*
+ * Dummy power off function.
+ */
+void (*pm_power_off)(void) = machine_power_off;
+
+static int __init early_parse_mem(char *p)
+{
+ memory_end = memparse(p, &p);
+ return 0;
+}
+early_param("mem", early_parse_mem);
+
+/*
+ * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
+ */
+static int __init early_parse_ipldelay(char *p)
+{
+ unsigned long delay = 0;
+
+ delay = simple_strtoul(p, &p, 0);
+
+ switch (*p) {
+ case 's':
+ case 'S':
+ delay *= 1000000;
+ break;
+ case 'm':
+ case 'M':
+ delay *= 60 * 1000000;
+ }
+
+ /* now wait for the requested amount of time */
+ udelay(delay);
+
+ return 0;
+}
+early_param("ipldelay", early_parse_ipldelay);
+
+#ifdef CONFIG_S390_SWITCH_AMODE
+unsigned int switch_amode = 0;
+EXPORT_SYMBOL_GPL(switch_amode);
+
+static void set_amode_and_uaccess(unsigned long user_amode,
+ unsigned long user32_amode)
+{
+ psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
+ PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
+#ifdef CONFIG_COMPAT
+ psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
+ PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
+ psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
+ PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
+ PSW32_MASK_PSTATE;
+#endif
+ psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
+ PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
+
+ if (MACHINE_HAS_MVCOS) {
+ printk("mvcos available.\n");
+ memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
+ } else {
+ printk("mvcos not available.\n");
+ memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
+ }
+}
+
+/*
+ * Switch kernel/user addressing modes?
+ */
+static int __init early_parse_switch_amode(char *p)
+{
+ switch_amode = 1;
+ return 0;
+}
+early_param("switch_amode", early_parse_switch_amode);
+
+#else /* CONFIG_S390_SWITCH_AMODE */
+static inline void set_amode_and_uaccess(unsigned long user_amode,
+ unsigned long user32_amode)
+{
+}
+#endif /* CONFIG_S390_SWITCH_AMODE */
+
+#ifdef CONFIG_S390_EXEC_PROTECT
+unsigned int s390_noexec = 0;
+EXPORT_SYMBOL_GPL(s390_noexec);
+
+/*
+ * Enable execute protection?
+ */
+static int __init early_parse_noexec(char *p)
+{
+ if (!strncmp(p, "off", 3))
+ return 0;
+ switch_amode = 1;
+ s390_noexec = 1;
+ return 0;
+}
+early_param("noexec", early_parse_noexec);
+#endif /* CONFIG_S390_EXEC_PROTECT */
+
+static void setup_addressing_mode(void)
+{
+ if (s390_noexec) {
+ printk("S390 execute protection active, ");
+ set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
+ } else if (switch_amode) {
+ printk("S390 address spaces switched, ");
+ set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
+ }
+#ifdef CONFIG_TRACE_IRQFLAGS
+ sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
+ io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
+#endif
+}
+
+static void __init
+setup_lowcore(void)
+{
+ struct _lowcore *lc;
+ int lc_pages;
+
+ /*
+ * Setup lowcore for boot cpu
+ */
+ lc_pages = sizeof(void *) == 8 ? 2 : 1;
+ lc = (struct _lowcore *)
+ __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
+ memset(lc, 0, lc_pages * PAGE_SIZE);
+ lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+ lc->restart_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
+ if (switch_amode)
+ lc->restart_psw.mask |= PSW_ASC_HOME;
+ 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 & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
+ 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;
+ lc->panic_stack = (unsigned long)
+ __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
+ lc->current_task = (unsigned long) init_thread_union.thread_info.task;
+ lc->thread_info = (unsigned long) &init_thread_union;
+#ifndef CONFIG_64BIT
+ if (MACHINE_HAS_IEEE) {
+ lc->extended_save_area_addr = (__u32)
+ __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
+ /* enable extended save area */
+ __ctl_set_bit(14, 29);
+ }
+#endif
+ set_prefix((u32)(unsigned long) lc);
+}
+
+static void __init
+setup_resources(void)
+{
+ struct resource *res, *sub_res;
+ int i;
+
+ 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;
+
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ if (!memory_chunk[i].size)
+ continue;
+ 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);
+
+ if (code_resource.start >= res->start &&
+ code_resource.start <= res->end &&
+ code_resource.end > res->end) {
+ sub_res = alloc_bootmem_low(sizeof(struct resource));
+ memcpy(sub_res, &code_resource,
+ sizeof(struct resource));
+ sub_res->end = res->end;
+ code_resource.start = res->end + 1;
+ request_resource(res, sub_res);
+ }
+
+ if (code_resource.start >= res->start &&
+ code_resource.start <= res->end &&
+ code_resource.end <= res->end)
+ request_resource(res, &code_resource);
+
+ if (data_resource.start >= res->start &&
+ data_resource.start <= res->end &&
+ data_resource.end > res->end) {
+ sub_res = alloc_bootmem_low(sizeof(struct resource));
+ memcpy(sub_res, &data_resource,
+ sizeof(struct resource));
+ sub_res->end = res->end;
+ data_resource.start = res->end + 1;
+ request_resource(res, sub_res);
+ }
+
+ if (data_resource.start >= res->start &&
+ data_resource.start <= res->end &&
+ data_resource.end <= res->end)
+ request_resource(res, &data_resource);
+ }
+}
+
+unsigned long real_memory_size;
+EXPORT_SYMBOL_GPL(real_memory_size);
+
+static void __init setup_memory_end(void)
+{
+ unsigned long memory_size;
+ unsigned long max_mem;
+ int i;
+
+#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
+ if (ipl_info.type == IPL_TYPE_FCP_DUMP)
+ memory_end = ZFCPDUMP_HSA_SIZE;
+#endif
+ memory_size = 0;
+ memory_end &= PAGE_MASK;
+
+ max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
+ memory_end = min(max_mem, memory_end);
+
+ /*
+ * Make sure all chunks are MAX_ORDER aligned so we don't need the
+ * extra checks that HOLES_IN_ZONE would require.
+ */
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ unsigned long start, end;
+ struct mem_chunk *chunk;
+ unsigned long align;
+
+ chunk = &memory_chunk[i];
+ align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
+ start = (chunk->addr + align - 1) & ~(align - 1);
+ end = (chunk->addr + chunk->size) & ~(align - 1);
+ if (start >= end)
+ memset(chunk, 0, sizeof(*chunk));
+ else {
+ chunk->addr = start;
+ chunk->size = end - start;
+ }
+ }
+
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ struct mem_chunk *chunk = &memory_chunk[i];
+
+ real_memory_size = max(real_memory_size,
+ chunk->addr + chunk->size);
+ if (chunk->addr >= max_mem) {
+ memset(chunk, 0, sizeof(*chunk));
+ continue;
+ }
+ if (chunk->addr + chunk->size > max_mem)
+ chunk->size = max_mem - chunk->addr;
+ memory_size = max(memory_size, chunk->addr + chunk->size);
+ }
+ if (!memory_end)
+ memory_end = memory_size;
+}
+
+static void __init
+setup_memory(void)
+{
+ unsigned long bootmap_size;
+ unsigned long start_pfn, end_pfn;
+ int i;
+
+ /*
+ * partially used pages are not usable - thus
+ * we are rounding upwards:
+ */
+ start_pfn = PFN_UP(__pa(&_end));
+ end_pfn = max_pfn = PFN_DOWN(memory_end);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ /*
+ * Move the initrd in case the bitmap of the bootmem allocater
+ * would overwrite it.
+ */
+
+ if (INITRD_START && INITRD_SIZE) {
+ unsigned long bmap_size;
+ unsigned long start;
+
+ bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
+ bmap_size = PFN_PHYS(bmap_size);
+
+ if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
+ start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
+
+ if (start + INITRD_SIZE > memory_end) {
+ printk("initrd extends beyond end of memory "
+ "(0x%08lx > 0x%08lx)\n"
+ "disabling initrd\n",
+ start + INITRD_SIZE, memory_end);
+ INITRD_START = INITRD_SIZE = 0;
+ } else {
+ printk("Moving initrd (0x%08lx -> 0x%08lx, "
+ "size: %ld)\n",
+ INITRD_START, start, INITRD_SIZE);
+ memmove((void *) start, (void *) INITRD_START,
+ INITRD_SIZE);
+ INITRD_START = start;
+ }
+ }
+ }
+#endif
+
+ /*
+ * Initialize the boot-time allocator
+ */
+ bootmap_size = init_bootmem(start_pfn, end_pfn);
+
+ /*
+ * Register RAM areas with the bootmem allocator.
+ */
+
+ for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
+ unsigned long start_chunk, end_chunk, pfn;
+
+ if (memory_chunk[i].type != CHUNK_READ_WRITE)
+ continue;
+ start_chunk = PFN_DOWN(memory_chunk[i].addr);
+ end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
+ end_chunk = min(end_chunk, end_pfn);
+ if (start_chunk >= end_chunk)
+ continue;
+ add_active_range(0, start_chunk, end_chunk);
+ pfn = max(start_chunk, start_pfn);
+ for (; pfn <= end_chunk; pfn++)
+ page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
+ }
+
+ psw_set_key(PAGE_DEFAULT_KEY);
+
+ free_bootmem_with_active_regions(0, max_pfn);
+
+ /*
+ * Reserve memory used for lowcore/command line/kernel image.
+ */
+ reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
+ reserve_bootmem((unsigned long)_stext,
+ PFN_PHYS(start_pfn) - (unsigned long)_stext,
+ BOOTMEM_DEFAULT);
+ /*
+ * 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,
+ BOOTMEM_DEFAULT);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (INITRD_START && INITRD_SIZE) {
+ if (INITRD_START + INITRD_SIZE <= memory_end) {
+ reserve_bootmem(INITRD_START, INITRD_SIZE,
+ BOOTMEM_DEFAULT);
+ 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
+}
+
+static __init unsigned int stfl(void)
+{
+ asm volatile(
+ " .insn s,0xb2b10000,0(0)\n" /* stfl */
+ "0:\n"
+ EX_TABLE(0b,0b));
+ return S390_lowcore.stfl_fac_list;
+}
+
+static __init int stfle(unsigned long long *list, int doublewords)
+{
+ typedef struct { unsigned long long _[doublewords]; } addrtype;
+ register unsigned long __nr asm("0") = doublewords - 1;
+
+ asm volatile(".insn s,0xb2b00000,%0" /* stfle */
+ : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
+ return __nr + 1;
+}
+
+/*
+ * Setup hardware capabilities.
+ */
+static void __init setup_hwcaps(void)
+{
+ static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
+ struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
+ unsigned long long facility_list_extended;
+ unsigned int facility_list;
+ int i;
+
+ facility_list = stfl();
+ /*
+ * The store facility list bits numbers as found in the principles
+ * of operation are numbered with bit 1UL<<31 as number 0 to
+ * bit 1UL<<0 as number 31.
+ * Bit 0: instructions named N3, "backported" to esa-mode
+ * Bit 2: z/Architecture mode is active
+ * Bit 7: the store-facility-list-extended facility is installed
+ * Bit 17: the message-security assist is installed
+ * Bit 19: the long-displacement facility is installed
+ * Bit 21: the extended-immediate facility is installed
+ * These get translated to:
+ * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
+ * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
+ * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
+ */
+ for (i = 0; i < 6; i++)
+ if (facility_list & (1UL << (31 - stfl_bits[i])))
+ elf_hwcap |= 1UL << i;
+
+ /*
+ * Check for additional facilities with store-facility-list-extended.
+ * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
+ * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
+ * as stored by stfl, bits 32-xxx contain additional facilities.
+ * How many facility words are stored depends on the number of
+ * doublewords passed to the instruction. The additional facilites
+ * are:
+ * Bit 43: decimal floating point facility is installed
+ * translated to:
+ * HWCAP_S390_DFP bit 6.
+ */
+ if ((elf_hwcap & (1UL << 2)) &&
+ stfle(&facility_list_extended, 1) > 0) {
+ if (facility_list_extended & (1ULL << (64 - 43)))
+ elf_hwcap |= 1UL << 6;
+ }
+
+ switch (cpuinfo->cpu_id.machine) {
+ case 0x9672:
+#if !defined(CONFIG_64BIT)
+ default: /* Use "g5" as default for 31 bit kernels. */
+#endif
+ strcpy(elf_platform, "g5");
+ break;
+ case 0x2064:
+ case 0x2066:
+#if defined(CONFIG_64BIT)
+ default: /* Use "z900" as default for 64 bit kernels. */
+#endif
+ strcpy(elf_platform, "z900");
+ break;
+ case 0x2084:
+ case 0x2086:
+ strcpy(elf_platform, "z990");
+ break;
+ case 0x2094:
+ strcpy(elf_platform, "z9-109");
+ break;
+ }
+}
+
+/*
+ * Setup function called from init/main.c just after the banner
+ * was printed.
+ */
+
+void __init
+setup_arch(char **cmdline_p)
+{
+ /*
+ * print what head.S has found out about the machine
+ */
+#ifndef CONFIG_64BIT
+ 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_64BIT */
+ printk((MACHINE_IS_VM) ?
+ "We are running under VM (64 bit mode)\n" :
+ "We are running native (64 bit mode)\n");
+#endif /* CONFIG_64BIT */
+
+ /* Save unparsed command line copy for /proc/cmdline */
+ strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
+
+ *cmdline_p = COMMAND_LINE;
+ *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
+
+ ROOT_DEV = Root_RAM0;
+
+ 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;
+
+ if (MACHINE_HAS_MVCOS)
+ memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
+ else
+ memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
+
+ parse_early_param();
+
+ setup_ipl();
+ setup_memory_end();
+ setup_addressing_mode();
+ setup_memory();
+ setup_resources();
+ setup_lowcore();
+
+ cpu_init();
+ __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
+
+ /*
+ * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
+ */
+ setup_hwcaps();
+
+ /*
+ * Create kernel page tables and switch to virtual addressing.
+ */
+ paging_init();
+
+ /* Setup default console */
+ conmode_default();
+
+ /* Setup zfcpdump support */
+ setup_zfcpdump(console_devno);
+}
+
+void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
+{
+ printk(KERN_INFO "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)
+{
+ static const char *hwcap_str[7] = {
+ "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
+ };
+ struct cpuinfo_S390 *cpuinfo;
+ unsigned long n = (unsigned long) v - 1;
+ int i;
+
+ s390_adjust_jiffies();
+ preempt_disable();
+ 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);
+ seq_puts(m, "features\t: ");
+ for (i = 0; i < 7; i++)
+ if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
+ seq_printf(m, "%s ", hwcap_str[i]);
+ seq_puts(m, "\n");
+ }
+
+ 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);
+ }
+ preempt_enable();
+ 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)
+{
+}
+const struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = show_cpuinfo,
+};
+