path: root/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 <linux/device.h>
#include <linux/notifier.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>

/*
 * 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;

/*
 * 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 __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] = "";
char vmpanic_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);

static int vmpanic_notify(struct notifier_block *self, unsigned long event,
			  void *data)
{
	if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
		cpcmd(vmpanic_cmd, NULL, 0, NULL);

	return NOTIFY_OK;
}

#define PANIC_PRI_VMPANIC	0

static struct notifier_block vmpanic_nb = {
	.notifier_call = vmpanic_notify,
	.priority = PANIC_PRI_VMPANIC
};

static int __init vmpanic_setup(char *str)
{
	static int register_done __initdata = 0;

	strncpy_skip_quote(vmpanic_cmd, str, 127);
	vmpanic_cmd[127] = 0;
	if (!register_done) {
		register_done = 1;
		atomic_notifier_chain_register(&panic_notifier_list,
					       &vmpanic_nb);
	}
	return 1;
}

__setup("vmpanic=", vmpanic_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;
}