setup.c

该文件是rt_linux

/*
 *  arch/s390/kernel/setup.c
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Hartmut Penner ([e-mail]),
 *               Martin Schwidefsky ([e-mail])
 *
 *  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/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>
#ifdef CONFIG_BLK_DEV_RAM
#include <linux/blk.h>
#endif
#include <linux/bootmem.h>
#include <linux/console.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/smp.h>
#include <asm/mmu_context.h>
#include <asm/cpcmd.h>

/*
 * Machine setup..
 */
unsigned int console_mode = 0;
unsigned int console_device = -1;
unsigned long memory_size = 0;
unsigned long machine_flags = 0;
struct { unsigned long addr, size, type; } memory_chunk[16] = { { 0 } };
#define CHUNK_READ_WRITE 0
#define CHUNK_READ_ONLY 1
__u16 boot_cpu_addr;
int cpus_initialized = 0;
unsigned long cpu_initialized = 0;
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, };
       char saved_command_line[COMMAND_LINE_SIZE];

static struct resource code_resource = { "Kernel code", 0x100000, 0 };
static struct resource data_resource = { "Kernel data", 0, 0 };

/*
 * cpu_init() initializes state that is per-CPU.
 */
void __init cpu_init (void)
{
        int nr = smp_processor_id();
        int addr = hard_smp_processor_id();

        if (test_and_set_bit(nr,&cpu_initialized)) {
                printk("CPU#%d ALREADY INITIALIZED!!!!!!!!!\n", nr);
                for (;;) __sti();
        }
        cpus_initialized++;

        /*
         * 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;
        S390_lowcore.cpu_data.cpu_nr = nr;

        /*
         * Force FPU initialization:
         */
        current->flags &= ~PF_USEDFPU;
        current->used_math = 0;

        /* Setup active_mm for idle_task  */
        atomic_inc(&init_mm.mm_count);
        current->active_mm = &init_mm;
        if (current->mm)
                BUG();
        enter_lazy_tlb(&init_mm, current, nr);
}

/*
 * 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_device = vdev;
	return 1;
}

__setup("condev=", condev_setup);

static int __init conmode_setup(char *str)
{
#if defined(CONFIG_HWC_CONSOLE)
	if (strncmp(str, "hwc", 4) == 0)
                SET_CONSOLE_HWC;
#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 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_HWC_CONSOLE)
			SET_CONSOLE_HWC;
#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_HWC_CONSOLE)
			SET_CONSOLE_HWC;
#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_HWC_CONSOLE)
			SET_CONSOLE_HWC;
#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_HWC_CONSOLE)
		SET_CONSOLE_HWC;
#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.
 */
static void do_machine_restart_nonsmp(char * __unused)
{
	reipl(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)
{
	_machine_restart(command);
}