[linux-2.6-block.git] / arch / s390 / kernel / setup.c

/*
 *  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>
#include <asm/page.h>
#include <asm/ptrace.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;
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 */
unsigned long __initdata zholes_size[MAX_NR_ZONES];
static unsigned long __initdata memory_end;

/*
 * 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",
	.start = (unsigned long) &_text,
	.end = (unsigned long) &_etext - 1,
	.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};

static struct resource data_resource = {
	.name = "Kernel data",
	.start = (unsigned long) &_etext,
	.end = (unsigned long) &_edata - 1,
	.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, 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)
			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);
extern void reipl_diag(void);
static void do_machine_restart_nonsmp(char * __unused)
{
	reipl_diag();

	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);
}

void machine_halt(void)
{
	console_unblank();
	_machine_halt();
}

void machine_power_off(void)
{
	console_unblank();
	_machine_power_off();
}

static void __init
add_memory_hole(unsigned long start, unsigned long end)
{
	unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;

	if (end <= dma_pfn)
		zholes_size[ZONE_DMA] += end - start + 1;
	else if (start > dma_pfn)
		zholes_size[ZONE_NORMAL] += end - start + 1;
	else {
		zholes_size[ZONE_DMA] += dma_pfn - start + 1;
		zholes_size[ZONE_NORMAL] += end - dma_pfn;
	}
}

static void __init
parse_cmdline_early(char **cmdline_p)
{
	char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
	unsigned long delay = 0;

	/* 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;
}

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;
	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_ARCH_S390X
	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;
	int i;

	for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
		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);
	}
}

static void __init
setup_memory(void)
{
        unsigned long bootmap_size;
	unsigned long start_pfn, end_pfn, init_pfn;
	unsigned long last_rw_end;
	int i;

	/*
	 * 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 storage key for kernel pages */
	for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
		page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);

	/*
	 * Initialize the boot-time allocator (with low memory only):
	 */
	bootmap_size = init_bootmem(start_pfn, end_pfn);

	/*
	 * Register RAM areas with the bootmem allocator.
	 */
	last_rw_end = start_pfn;

	for (i = 0; i < MEMORY_CHUNKS && 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) {
			/* Initialize storage key for RAM pages */
			for (init_pfn = start_chunk ; init_pfn < end_chunk;
			     init_pfn++)
				page_set_storage_key(init_pfn << PAGE_SHIFT,
						     PAGE_DEFAULT_KEY);
			free_bootmem(start_chunk << PAGE_SHIFT,
				     (end_chunk - start_chunk) << PAGE_SHIFT);
			if (last_rw_end < start_chunk)
				add_memory_hole(last_rw_end, start_chunk - 1);
			last_rw_end = end_chunk;
		}
	}

	psw_set_key(PAGE_DEFAULT_KEY);

	if (last_rw_end < end_pfn - 1)
		add_memory_hole(last_rw_end, end_pfn - 1);

	/*
	 * 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
}

/*
 * 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_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;
#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;

	parse_cmdline_early(cmdline_p);

	setup_memory();
	setup_resources();
	setup_lowcore();

        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;

	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);
	}
	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)
{
}
struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= show_cpuinfo,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/s390/kernel/setup.c
	3	*
	4	* S390 version
	5	* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
	6	* Author(s): Hartmut Penner (hp@de.ibm.com),
	7	* Martin Schwidefsky (schwidefsky@de.ibm.com)
	8	*
	9	* Derived from "arch/i386/kernel/setup.c"
	10	* Copyright (C) 1995, Linus Torvalds
	11	*/
	12
	13	/*
	14	* This file handles the architecture-dependent parts of initialization
	15	*/
	16
	17	#include <linux/errno.h>
	18	#include <linux/module.h>
	19	#include <linux/sched.h>
	20	#include <linux/kernel.h>
	21	#include <linux/mm.h>
	22	#include <linux/stddef.h>
	23	#include <linux/unistd.h>
	24	#include <linux/ptrace.h>
	25	#include <linux/slab.h>
	26	#include <linux/user.h>
	27	#include <linux/a.out.h>
	28	#include <linux/tty.h>
	29	#include <linux/ioport.h>
	30	#include <linux/delay.h>
	31	#include <linux/config.h>
	32	#include <linux/init.h>
	33	#include <linux/initrd.h>
	34	#include <linux/bootmem.h>
	35	#include <linux/root_dev.h>
	36	#include <linux/console.h>
	37	#include <linux/seq_file.h>
	38	#include <linux/kernel_stat.h>
	39
	40	#include <asm/uaccess.h>
	41	#include <asm/system.h>
	42	#include <asm/smp.h>
	43	#include <asm/mmu_context.h>
	44	#include <asm/cpcmd.h>
	45	#include <asm/lowcore.h>
	46	#include <asm/irq.h>
0b642ede PO	47	#include <asm/page.h>
0b642ede PO	48	#include <asm/ptrace.h>
1da177e4 LT	49
	50	/*
	51	* Machine setup..
	52	*/
	53	unsigned int console_mode = 0;
	54	unsigned int console_devno = -1;
	55	unsigned int console_irq = -1;
	56	unsigned long memory_size = 0;
	57	unsigned long machine_flags = 0;
1da177e4 LT	58	struct {
	59	unsigned long addr, size, type;
	60	} memory_chunk[MEMORY_CHUNKS] = { { 0 } };
	61	#define CHUNK_READ_WRITE 0
	62	#define CHUNK_READ_ONLY 1
	63	volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
c9e37353 HC	64	unsigned long __initdata zholes_size[MAX_NR_ZONES];
c9e37353 HC	65	static unsigned long __initdata memory_end;
1da177e4 LT	66
	67	/*
	68	* Setup options
	69	*/
	70	extern int _text,_etext, _edata, _end;
	71
	72	/*
	73	* This is set up by the setup-routine at boot-time
	74	* for S390 need to find out, what we have to setup
	75	* using address 0x10400 ...
	76	*/
	77
	78	#include <asm/setup.h>
	79
	80	static char command_line[COMMAND_LINE_SIZE] = { 0, };
	81
	82	static struct resource code_resource = {
	83	.name = "Kernel code",
c9e37353 HC	84	.start = (unsigned long) &_text,
c9e37353 HC	85	.end = (unsigned long) &_etext - 1,
1da177e4 LT	86	.flags = IORESOURCE_BUSY \| IORESOURCE_MEM,
	87	};
	88
	89	static struct resource data_resource = {
	90	.name = "Kernel data",
c9e37353 HC	91	.start = (unsigned long) &_etext,
c9e37353 HC	92	.end = (unsigned long) &_edata - 1,
1da177e4 LT	93	.flags = IORESOURCE_BUSY \| IORESOURCE_MEM,
	94	};
	95
	96	/*
	97	* cpu_init() initializes state that is per-CPU.
	98	*/
	99	void __devinit cpu_init (void)
	100	{
	101	int addr = hard_smp_processor_id();
	102
	103	/*
	104	* Store processor id in lowcore (used e.g. in timer_interrupt)
	105	*/
	106	asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
	107	S390_lowcore.cpu_data.cpu_addr = addr;
	108
	109	/*
	110	* Force FPU initialization:
	111	*/
	112	clear_thread_flag(TIF_USEDFPU);
	113	clear_used_math();
	114
	115	atomic_inc(&init_mm.mm_count);
	116	current->active_mm = &init_mm;
	117	if (current->mm)
	118	BUG();
	119	enter_lazy_tlb(&init_mm, current);
	120	}
	121
	122	/*
	123	* VM halt and poweroff setup routines
	124	*/
	125	char vmhalt_cmd[128] = "";
	126	char vmpoff_cmd[128] = "";
	127
	128	static inline void strncpy_skip_quote(char dst, char src, int n)
	129	{
	130	int sx, dx;
	131
	132	dx = 0;
	133	for (sx = 0; src[sx] != 0; sx++) {
	134	if (src[sx] == '"') continue;
	135	dst[dx++] = src[sx];
	136	if (dx >= n) break;
	137	}
	138	}
	139
	140	static int __init vmhalt_setup(char *str)
	141	{
	142	strncpy_skip_quote(vmhalt_cmd, str, 127);
	143	vmhalt_cmd[127] = 0;
	144	return 1;
	145	}
	146
	147	__setup("vmhalt=", vmhalt_setup);
	148
	149	static int __init vmpoff_setup(char *str)
	150	{
	151	strncpy_skip_quote(vmpoff_cmd, str, 127);
	152	vmpoff_cmd[127] = 0;
	153	return 1;
	154	}
	155
	156	__setup("vmpoff=", vmpoff_setup);
157
158	/*
159	* condev= and conmode= setup parameter.
160	*/
161
162	static int __init condev_setup(char *str)
163	{
164	int vdev;
165
166	vdev = simple_strtoul(str, &str, 0);
167	if (vdev >= 0 && vdev < 65536) {
168	console_devno = vdev;
169	console_irq = -1;
170	}
171	return 1;
172	}
173
174	__setup("condev=", condev_setup);
175
176	static int __init conmode_setup(char *str)
177	{
178	#if defined(CONFIG_SCLP_CONSOLE)
179	if (strncmp(str, "hwc", 4) == 0 \|\| strncmp(str, "sclp", 5) == 0)
180	SET_CONSOLE_SCLP;
181	#endif
182	#if defined(CONFIG_TN3215_CONSOLE)
183	if (strncmp(str, "3215", 5) == 0)
184	SET_CONSOLE_3215;
185	#endif
186	#if defined(CONFIG_TN3270_CONSOLE)
187	if (strncmp(str, "3270", 5) == 0)
188	SET_CONSOLE_3270;
189	#endif
190	return 1;
191	}
192
193	__setup("conmode=", conmode_setup);
194
195	static void __init conmode_default(void)
196	{
197	char query_buffer[1024];
198	char *ptr;
199
200	if (MACHINE_IS_VM) {
6b979de3	201	__cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
1da177e4 LT	202	console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
	203	ptr = strstr(query_buffer, "SUBCHANNEL =");
	204	console_irq = simple_strtoul(ptr + 13, NULL, 16);
6b979de3	205	__cpcmd("QUERY TERM", query_buffer, 1024, NULL);
1da177e4 LT	206	ptr = strstr(query_buffer, "CONMODE");
	207	/*
	208	* Set the conmode to 3215 so that the device recognition
	209	* will set the cu_type of the console to 3215. If the
	210	* conmode is 3270 and we don't set it back then both
	211	* 3215 and the 3270 driver will try to access the console
	212	* device (3215 as console and 3270 as normal tty).
	213	*/
6b979de3	214	__cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
1da177e4 LT	215	if (ptr == NULL) {
	216	#if defined(CONFIG_SCLP_CONSOLE)
	217	SET_CONSOLE_SCLP;
	218	#endif
	219	return;
	220	}
	221	if (strncmp(ptr + 8, "3270", 4) == 0) {
	222	#if defined(CONFIG_TN3270_CONSOLE)
	223	SET_CONSOLE_3270;
	224	#elif defined(CONFIG_TN3215_CONSOLE)
	225	SET_CONSOLE_3215;
	226	#elif defined(CONFIG_SCLP_CONSOLE)
	227	SET_CONSOLE_SCLP;
	228	#endif
	229	} else if (strncmp(ptr + 8, "3215", 4) == 0) {
	230	#if defined(CONFIG_TN3215_CONSOLE)
	231	SET_CONSOLE_3215;
	232	#elif defined(CONFIG_TN3270_CONSOLE)
	233	SET_CONSOLE_3270;
	234	#elif defined(CONFIG_SCLP_CONSOLE)
	235	SET_CONSOLE_SCLP;
	236	#endif
	237	}
	238	} else if (MACHINE_IS_P390) {
	239	#if defined(CONFIG_TN3215_CONSOLE)
	240	SET_CONSOLE_3215;
	241	#elif defined(CONFIG_TN3270_CONSOLE)
	242	SET_CONSOLE_3270;
	243	#endif
	244	} else {
	245	#if defined(CONFIG_SCLP_CONSOLE)
	246	SET_CONSOLE_SCLP;
	247	#endif
	248	}
	249	}
	250
	251	#ifdef CONFIG_SMP
	252	extern void machine_restart_smp(char *);
	253	extern void machine_halt_smp(void);
	254	extern void machine_power_off_smp(void);
	255
	256	void (_machine_restart)(char command) = machine_restart_smp;
	257	void (*_machine_halt)(void) = machine_halt_smp;
	258	void (*_machine_power_off)(void) = machine_power_off_smp;
	259	#else
	260	/*
	261	* Reboot, halt and power_off routines for non SMP.
	262	*/
	263	extern void reipl(unsigned long devno);
c782268b	264	extern void reipl_diag(void);
1da177e4 LT	265	static void do_machine_restart_nonsmp(char * __unused)
1da177e4 LT	266	{
c782268b VS	267	reipl_diag();
c782268b VS	268
1da177e4 LT	269	if (MACHINE_IS_VM)
	270	cpcmd ("IPL", NULL, 0);
	271	else
	272	reipl (0x10000 \| S390_lowcore.ipl_device);
	273	}
	274
	275	static void do_machine_halt_nonsmp(void)
	276	{
	277	if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
	278	cpcmd(vmhalt_cmd, NULL, 0);
	279	signal_processor(smp_processor_id(), sigp_stop_and_store_status);
	280	}
	281
	282	static void do_machine_power_off_nonsmp(void)
	283	{
	284	if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
	285	cpcmd(vmpoff_cmd, NULL, 0);
	286	signal_processor(smp_processor_id(), sigp_stop_and_store_status);
	287	}
	288
	289	void (_machine_restart)(char command) = do_machine_restart_nonsmp;
	290	void (*_machine_halt)(void) = do_machine_halt_nonsmp;
	291	void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
	292	#endif
	293
	294	/*
	295	* Reboot, halt and power_off stubs. They just call _machine_restart,
	296	* _machine_halt or _machine_power_off.
	297	*/
	298
	299	void machine_restart(char *command)
	300	{
	301	console_unblank();
	302	_machine_restart(command);
	303	}
	304
1da177e4 LT	305	void machine_halt(void)
	306	{
	307	console_unblank();
	308	_machine_halt();
	309	}
	310
1da177e4 LT	311	void machine_power_off(void)
	312	{
	313	console_unblank();
	314	_machine_power_off();
	315	}
	316
c9e37353 HC	317	static void __init
c9e37353 HC	318	add_memory_hole(unsigned long start, unsigned long end)
1da177e4	319	{
c9e37353 HC	320	unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
	321
	322	if (end <= dma_pfn)
	323	zholes_size[ZONE_DMA] += end - start + 1;
	324	else if (start > dma_pfn)
	325	zholes_size[ZONE_NORMAL] += end - start + 1;
	326	else {
	327	zholes_size[ZONE_DMA] += dma_pfn - start + 1;
	328	zholes_size[ZONE_NORMAL] += end - dma_pfn;
	329	}
	330	}
1da177e4	331
c9e37353 HC	332	static void __init
	333	parse_cmdline_early(char **cmdline_p)
	334	{
	335	char c = ' ', cn, to = command_line, from = COMMAND_LINE;
	336	unsigned long delay = 0;
1da177e4	337
c9e37353 HC	338	/* Save unparsed command line copy for /proc/cmdline */
	339	memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
	340	saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
1da177e4	341
c9e37353 HC	342	for (;;) {
	343	/*
	344	* "mem=XXX[kKmM]" sets memsize
	345	*/
	346	if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
	347	memory_end = simple_strtoul(from+4, &from, 0);
	348	if ( from == 'K' \|\| from == 'k' ) {
	349	memory_end = memory_end << 10;
	350	from++;
	351	} else if ( from == 'M' \|\| from == 'm' ) {
	352	memory_end = memory_end << 20;
	353	from++;
	354	}
	355	}
	356	/*
	357	* "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
	358	*/
	359	if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
	360	delay = simple_strtoul(from+9, &from, 0);
1da177e4 LT	361	if (from == 's' \|\| from == 'S') {
	362	delay = delay*1000000;
	363	from++;
	364	} else if (from == 'm' \|\| from == 'M') {
	365	delay = delay601000000;
	366	from++;
	367	}
	368	/* now wait for the requested amount of time */
	369	udelay(delay);
c9e37353 HC	370	}
	371	cn = *(from++);
	372	if (!cn)
	373	break;
	374	if (cn == '\n')
	375	cn = ' '; /* replace newlines with space */
1da177e4 LT	376	if (cn == 0x0d)
1da177e4 LT	377	cn = ' '; /* replace 0x0d with space */
c9e37353 HC	378	if (cn == ' ' && c == ' ')
	379	continue; /* remove additional spaces */
	380	c = cn;
	381	if (to - command_line >= COMMAND_LINE_SIZE)
	382	break;
	383	*(to++) = c;
	384	}
	385	if (c == ' ' && to > command_line) to--;
	386	*to = '\0';
	387	*cmdline_p = command_line;
	388	}
	389
	390	static void __init
	391	setup_lowcore(void)
	392	{
	393	struct _lowcore *lc;
	394	int lc_pages;
	395
	396	/*
	397	* Setup lowcore for boot cpu
	398	*/
	399	lc_pages = sizeof(void *) == 8 ? 2 : 1;
	400	lc = (struct _lowcore *)
	401	__alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
	402	memset(lc, 0, lc_pages * PAGE_SIZE);
0b642ede	403	lc->restart_psw.mask = PSW_BASE_BITS \| PSW_DEFAULT_KEY;
c9e37353 HC	404	lc->restart_psw.addr =
	405	PSW_ADDR_AMODE \| (unsigned long) restart_int_handler;
	406	lc->external_new_psw.mask = PSW_KERNEL_BITS;
	407	lc->external_new_psw.addr =
	408	PSW_ADDR_AMODE \| (unsigned long) ext_int_handler;
	409	lc->svc_new_psw.mask = PSW_KERNEL_BITS \| PSW_MASK_IO \| PSW_MASK_EXT;
	410	lc->svc_new_psw.addr = PSW_ADDR_AMODE \| (unsigned long) system_call;
	411	lc->program_new_psw.mask = PSW_KERNEL_BITS;
	412	lc->program_new_psw.addr =
	413	PSW_ADDR_AMODE \| (unsigned long)pgm_check_handler;
77fa2245 HC	414	lc->mcck_new_psw.mask =
77fa2245 HC	415	PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
c9e37353 HC	416	lc->mcck_new_psw.addr =
	417	PSW_ADDR_AMODE \| (unsigned long) mcck_int_handler;
	418	lc->io_new_psw.mask = PSW_KERNEL_BITS;
	419	lc->io_new_psw.addr = PSW_ADDR_AMODE \| (unsigned long) io_int_handler;
	420	lc->ipl_device = S390_lowcore.ipl_device;
	421	lc->jiffy_timer = -1LL;
	422	lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
	423	lc->async_stack = (unsigned long)
	424	__alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
c9e37353 HC	425	lc->panic_stack = (unsigned long)
c9e37353 HC	426	__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
c9e37353 HC	427	lc->current_task = (unsigned long) init_thread_union.thread_info.task;
c9e37353 HC	428	lc->thread_info = (unsigned long) &init_thread_union;
77fa2245 HC	429	#ifndef CONFIG_ARCH_S390X
	430	if (MACHINE_HAS_IEEE) {
	431	lc->extended_save_area_addr = (__u32)
	432	__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
	433	/* enable extended save area */
	434	ctl_set_bit(14, 29);
	435	}
	436	#endif
c9e37353 HC	437	set_prefix((u32)(unsigned long) lc);
	438	}
	439
	440	static void __init
	441	setup_resources(void)
	442	{
	443	struct resource *res;
	444	int i;
	445
	446	for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
	447	res = alloc_bootmem_low(sizeof(struct resource));
	448	res->flags = IORESOURCE_BUSY \| IORESOURCE_MEM;
	449	switch (memory_chunk[i].type) {
	450	case CHUNK_READ_WRITE:
	451	res->name = "System RAM";
	452	break;
	453	case CHUNK_READ_ONLY:
	454	res->name = "System ROM";
	455	res->flags \|= IORESOURCE_READONLY;
	456	break;
	457	default:
	458	res->name = "reserved";
	459	}
	460	res->start = memory_chunk[i].addr;
	461	res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
	462	request_resource(&iomem_resource, res);
	463	request_resource(res, &code_resource);
	464	request_resource(res, &data_resource);
	465	}
	466	}
	467
	468	static void __init
	469	setup_memory(void)
	470	{
	471	unsigned long bootmap_size;
0b642ede	472	unsigned long start_pfn, end_pfn, init_pfn;
c9e37353 HC	473	unsigned long last_rw_end;
c9e37353 HC	474	int i;
1da177e4 LT	475
	476	/*
	477	* partially used pages are not usable - thus
	478	* we are rounding upwards:
	479	*/
	480	start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
	481	end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
	482
0b642ede PO	483	/* Initialize storage key for kernel pages */
	484	for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
	485	page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
	486
1da177e4 LT	487	/*
	488	* Initialize the boot-time allocator (with low memory only):
	489	*/
	490	bootmap_size = init_bootmem(start_pfn, end_pfn);
	491
	492	/*
	493	* Register RAM areas with the bootmem allocator.
	494	*/
c9e37353 HC	495	last_rw_end = start_pfn;
c9e37353 HC	496
0b642ede	497	for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
1da177e4 LT	498	unsigned long start_chunk, end_chunk;
	499
	500	if (memory_chunk[i].type != CHUNK_READ_WRITE)
	501	continue;
	502	start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
	503	start_chunk >>= PAGE_SHIFT;
	504	end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
	505	end_chunk >>= PAGE_SHIFT;
	506	if (start_chunk < start_pfn)
	507	start_chunk = start_pfn;
	508	if (end_chunk > end_pfn)
	509	end_chunk = end_pfn;
c9e37353	510	if (start_chunk < end_chunk) {
0b642ede PO	511	/* Initialize storage key for RAM pages */
	512	for (init_pfn = start_chunk ; init_pfn < end_chunk;
	513	init_pfn++)
	514	page_set_storage_key(init_pfn << PAGE_SHIFT,
	515	PAGE_DEFAULT_KEY);
1da177e4 LT	516	free_bootmem(start_chunk << PAGE_SHIFT,
1da177e4 LT	517	(end_chunk - start_chunk) << PAGE_SHIFT);
c9e37353 HC	518	if (last_rw_end < start_chunk)
	519	add_memory_hole(last_rw_end, start_chunk - 1);
	520	last_rw_end = end_chunk;
	521	}
1da177e4 LT	522	}
1da177e4 LT	523
0b642ede PO	524	psw_set_key(PAGE_DEFAULT_KEY);
0b642ede PO	525
c9e37353 HC	526	if (last_rw_end < end_pfn - 1)
	527	add_memory_hole(last_rw_end, end_pfn - 1);
	528
	529	/*
	530	* Reserve the bootmem bitmap itself as well. We do this in two
	531	* steps (first step was init_bootmem()) because this catches
	532	* the (very unlikely) case of us accidentally initializing the
	533	* bootmem allocator with an invalid RAM area.
	534	*/
	535	reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
1da177e4 LT	536
1da177e4 LT	537	#ifdef CONFIG_BLK_DEV_INITRD
c9e37353	538	if (INITRD_START) {
1da177e4 LT	539	if (INITRD_START + INITRD_SIZE <= memory_end) {
	540	reserve_bootmem(INITRD_START, INITRD_SIZE);
	541	initrd_start = INITRD_START;
	542	initrd_end = initrd_start + INITRD_SIZE;
	543	} else {
c9e37353 HC	544	printk("initrd extends beyond end of memory "
	545	"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
	546	initrd_start + INITRD_SIZE, memory_end);
	547	initrd_start = initrd_end = 0;
1da177e4	548	}
c9e37353	549	}
1da177e4	550	#endif
c9e37353	551	}
1da177e4	552
c9e37353 HC	553	/*
	554	* Setup function called from init/main.c just after the banner
	555	* was printed.
	556	*/
1da177e4	557
c9e37353 HC	558	void __init
	559	setup_arch(char **cmdline_p)
	560	{
1da177e4	561	/*
c9e37353	562	* print what head.S has found out about the machine
1da177e4 LT	563	*/
1da177e4 LT	564	#ifndef CONFIG_ARCH_S390X
c9e37353 HC	565	printk((MACHINE_IS_VM) ?
	566	"We are running under VM (31 bit mode)\n" :
	567	"We are running native (31 bit mode)\n");
	568	printk((MACHINE_HAS_IEEE) ?
	569	"This machine has an IEEE fpu\n" :
	570	"This machine has no IEEE fpu\n");
1da177e4	571	#else /* CONFIG_ARCH_S390X */
c9e37353 HC	572	printk((MACHINE_IS_VM) ?
	573	"We are running under VM (64 bit mode)\n" :
	574	"We are running native (64 bit mode)\n");
1da177e4	575	#endif /* CONFIG_ARCH_S390X */
c9e37353 HC	576
	577	ROOT_DEV = Root_RAM0;
	578	#ifndef CONFIG_ARCH_S390X
	579	memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */
	580	/*
	581	* We need some free virtual space to be able to do vmalloc.
	582	* On a machine with 2GB memory we make sure that we have at
	583	* least 128 MB free space for vmalloc.
	584	*/
	585	if (memory_end > 192010241024)
	586	memory_end = 192010241024;
	587	#else /* CONFIG_ARCH_S390X */
	588	memory_end = memory_size & ~0x200000UL; /* detected in head.s */
1da177e4	589	#endif /* CONFIG_ARCH_S390X */
c9e37353 HC	590
	591	init_mm.start_code = PAGE_OFFSET;
	592	init_mm.end_code = (unsigned long) &_etext;
	593	init_mm.end_data = (unsigned long) &_edata;
	594	init_mm.brk = (unsigned long) &_end;
	595
	596	parse_cmdline_early(cmdline_p);
	597
	598	setup_memory();
	599	setup_resources();
	600	setup_lowcore();
	601
1da177e4 LT	602	cpu_init();
	603	__cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
	604
	605	/*
	606	* Create kernel page tables and switch to virtual addressing.
	607	*/
	608	paging_init();
	609
	610	/* Setup default console */
	611	conmode_default();
	612	}
	613
	614	void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
	615	{
	616	printk("cpu %d "
	617	#ifdef CONFIG_SMP
	618	"phys_idx=%d "
	619	#endif
	620	"vers=%02X ident=%06X machine=%04X unused=%04X\n",
	621	cpuinfo->cpu_nr,
	622	#ifdef CONFIG_SMP
	623	cpuinfo->cpu_addr,
	624	#endif
	625	cpuinfo->cpu_id.version,
	626	cpuinfo->cpu_id.ident,
	627	cpuinfo->cpu_id.machine,
	628	cpuinfo->cpu_id.unused);
	629	}
	630
	631	/*
	632	* show_cpuinfo - Get information on one CPU for use by procfs.
	633	*/
	634
	635	static int show_cpuinfo(struct seq_file m, void v)
	636	{
	637	struct cpuinfo_S390 *cpuinfo;
	638	unsigned long n = (unsigned long) v - 1;
	639
b7ae9dd8	640	preempt_disable();
1da177e4 LT	641	if (!n) {
	642	seq_printf(m, "vendor_id : IBM/S390\n"
	643	"# processors : %i\n"
	644	"bogomips per cpu: %lu.%02lu\n",
	645	num_online_cpus(), loops_per_jiffy/(500000/HZ),
	646	(loops_per_jiffy/(5000/HZ))%100);
	647	}
	648	if (cpu_online(n)) {
	649	#ifdef CONFIG_SMP
	650	if (smp_processor_id() == n)
	651	cpuinfo = &S390_lowcore.cpu_data;
	652	else
	653	cpuinfo = &lowcore_ptr[n]->cpu_data;
	654	#else
	655	cpuinfo = &S390_lowcore.cpu_data;
	656	#endif
	657	seq_printf(m, "processor %li: "
	658	"version = %02X, "
	659	"identification = %06X, "
	660	"machine = %04X\n",
	661	n, cpuinfo->cpu_id.version,
	662	cpuinfo->cpu_id.ident,
	663	cpuinfo->cpu_id.machine);
	664	}
b7ae9dd8	665	preempt_enable();
1da177e4 LT	666	return 0;
	667	}
	668
	669	static void c_start(struct seq_file m, loff_t *pos)
	670	{
	671	return pos < NR_CPUS ? (void )((unsigned long) *pos + 1) : NULL;
	672	}
	673	static void c_next(struct seq_file m, void v, loff_t pos)
	674	{
	675	++*pos;
	676	return c_start(m, pos);
	677	}
	678	static void c_stop(struct seq_file m, void v)
	679	{
	680	}
	681	struct seq_operations cpuinfo_op = {
	682	.start = c_start,
	683	.next = c_next,
	684	.stop = c_stop,
	685	.show = show_cpuinfo,
	686	};
	687