setup_32.c

Go to the documentation of this file.

/*
 *  linux/arch/sparc/kernel/setup.c
 *
 *  Copyright (C) 1995  David S. Miller ([email protected])
 *  Copyright (C) 2000  Anton Blanchard ([email protected])
 */

#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/initrd.h>
#include <asm/smp.h>
#include <linux/user.h>
#include <linux/screen_info.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/syscalls.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/console.h>
#include <linux/spinlock.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/kdebug.h>
#include <linux/export.h>
#include <linux/start_kernel.h>

#include <asm/io.h>
#include <asm/processor.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/traps.h>
#include <asm/vaddrs.h>
#include <asm/mbus.h>
#include <asm/idprom.h>
#include <asm/cpudata.h>
#include <asm/setup.h>
#include <asm/cacheflush.h>
#include <asm/sections.h>

#include "kernel.h"

struct screen_info screen_info = {
    0, 0,           /* orig-x, orig-y */
    0,          /* unused */
    0,          /* orig-video-page */
    0,          /* orig-video-mode */
    128,            /* orig-video-cols */
    0,0,0,          /* ega_ax, ega_bx, ega_cx */
    54,         /* orig-video-lines */
    0,                      /* orig-video-isVGA */
    16                      /* orig-video-points */
};

/* Typing sync at the prom prompt calls the function pointed to by
 * romvec->pv_synchook which I set to the following function.
 * This should sync all filesystems and return, for now it just
 * prints out pretty messages and returns.
 */

extern unsigned long trapbase;

/* Pretty sick eh? */
static void prom_sync_me(void)
{
    unsigned long prom_tbr, flags;

    /* XXX Badly broken. FIX! - Anton */
    local_irq_save(flags);
    __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
    __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
                 "nop\n\t"
                 "nop\n\t"
                 "nop\n\t" : : "r" (&trapbase));

    prom_printf("PROM SYNC COMMAND...\n");
    show_free_areas(0);
    if (!is_idle_task(current)) {
        local_irq_enable();
        sys_sync();
        local_irq_disable();
    }
    prom_printf("Returning to prom\n");

    __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
                 "nop\n\t"
                 "nop\n\t"
                 "nop\n\t" : : "r" (prom_tbr));
    local_irq_restore(flags);
}

static unsigned int boot_flags __initdata = 0;
#define BOOTME_DEBUG  0x1

/* Exported for mm/init.c:paging_init. */
unsigned long cmdline_memory_size __initdata = 0;

/* which CPU booted us (0xff = not set) */
unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */

static void
prom_console_write(struct console *con, const char *s, unsigned n)
{
    prom_write(s, n);
}

static struct console prom_early_console = {
    .name =     "earlyprom",
    .write =    prom_console_write,
    .flags =    CON_PRINTBUFFER | CON_BOOT,
    .index =    -1,
};

/* 
 * Process kernel command line switches that are specific to the
 * SPARC or that require special low-level processing.
 */
static void __init process_switch(char c)
{
    switch (c) {
    case 'd':
        boot_flags |= BOOTME_DEBUG;
        break;
    case 's':
        break;
    case 'h':
        prom_printf("boot_flags_init: Halt!\n");
        prom_halt();
        break;
    case 'p':
        prom_early_console.flags &= ~CON_BOOT;
        break;
    default:
        printk("Unknown boot switch (-%c)\n", c);
        break;
    }
}

static void __init boot_flags_init(char *commands)
{
    while (*commands) {
        /* Move to the start of the next "argument". */
        while (*commands && *commands == ' ')
            commands++;

        /* Process any command switches, otherwise skip it. */
        if (*commands == '\0')
            break;
        if (*commands == '-') {
            commands++;
            while (*commands && *commands != ' ')
                process_switch(*commands++);
            continue;
        }
        if (!strncmp(commands, "mem=", 4)) {
            /*
             * "mem=XXX[kKmM] overrides the PROM-reported
             * memory size.
             */
            cmdline_memory_size = simple_strtoul(commands + 4,
                             &commands, 0);
            if (*commands == 'K' || *commands == 'k') {
                cmdline_memory_size <<= 10;
                commands++;
            } else if (*commands=='M' || *commands=='m') {
                cmdline_memory_size <<= 20;
                commands++;
            }
        }
        while (*commands && *commands != ' ')
            commands++;
    }
}

extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK    0x07FF
#define RAMDISK_PROMPT_FLAG     0x8000
#define RAMDISK_LOAD_FLAG       0x4000

extern int root_mountflags;

char reboot_command[COMMAND_LINE_SIZE];

struct cpuid_patch_entry {
    unsigned int    addr;
    unsigned int    sun4d[3];
    unsigned int    leon[3];
};
extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;

static void __init per_cpu_patch(void)
{
    struct cpuid_patch_entry *p;

    if (sparc_cpu_model == sun4m) {
        /* Nothing to do, this is what the unpatched code
         * targets.
         */
        return;
    }

    p = &__cpuid_patch;
    while (p < &__cpuid_patch_end) {
        unsigned long addr = p->addr;
        unsigned int *insns;

        switch (sparc_cpu_model) {
        case sun4d:
            insns = &p->sun4d[0];
            break;

        case sparc_leon:
            insns = &p->leon[0];
            break;
        default:
            prom_printf("Unknown cpu type, halting.\n");
            prom_halt();
        }
        *(unsigned int *) (addr + 0) = insns[0];
        flushi(addr + 0);
        *(unsigned int *) (addr + 4) = insns[1];
        flushi(addr + 4);
        *(unsigned int *) (addr + 8) = insns[2];
        flushi(addr + 8);

        p++;
    }
}

struct leon_1insn_patch_entry {
    unsigned int addr;
    unsigned int insn;
};

enum sparc_cpu sparc_cpu_model;
EXPORT_SYMBOL(sparc_cpu_model);

static __init void leon_patch(void)
{
    struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
    struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;

    /* Default instruction is leon - no patching */
    if (sparc_cpu_model == sparc_leon)
        return;

    while (start < end) {
        unsigned long addr = start->addr;

        *(unsigned int *)(addr) = start->insn;
        flushi(addr);

        start++;
    }
}

struct tt_entry *sparc_ttable;
struct pt_regs fake_swapper_regs;

/* Called from head_32.S - before we have setup anything
 * in the kernel. Be very careful with what you do here.
 */
void __init sparc32_start_kernel(struct linux_romvec *rp)
{
    prom_init(rp);

    /* Set sparc_cpu_model */
    sparc_cpu_model = sun_unknown;
    if (!strcmp(&cputypval[0], "sun4m"))
        sparc_cpu_model = sun4m;
    if (!strcmp(&cputypval[0], "sun4s"))
        sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
    if (!strcmp(&cputypval[0], "sun4d"))
        sparc_cpu_model = sun4d;
    if (!strcmp(&cputypval[0], "sun4e"))
        sparc_cpu_model = sun4e;
    if (!strcmp(&cputypval[0], "sun4u"))
        sparc_cpu_model = sun4u;
    if (!strncmp(&cputypval[0], "leon" , 4))
        sparc_cpu_model = sparc_leon;

    leon_patch();
    start_kernel();
}

void __init setup_arch(char **cmdline_p)
{
    int i;
    unsigned long highest_paddr;

    sparc_ttable = (struct tt_entry *) &trapbase;

    /* Initialize PROM console and command line. */
    *cmdline_p = prom_getbootargs();
    strcpy(boot_command_line, *cmdline_p);
    parse_early_param();

    boot_flags_init(*cmdline_p);

    register_console(&prom_early_console);

    printk("ARCH: ");
    switch(sparc_cpu_model) {
    case sun4m:
        printk("SUN4M\n");
        break;
    case sun4d:
        printk("SUN4D\n");
        break;
    case sun4e:
        printk("SUN4E\n");
        break;
    case sun4u:
        printk("SUN4U\n");
        break;
    case sparc_leon:
        printk("LEON\n");
        break;
    default:
        printk("UNKNOWN!\n");
        break;
    }

#ifdef CONFIG_DUMMY_CONSOLE
    conswitchp = &dummy_con;
#endif

    idprom_init();
    load_mmu();

    phys_base = 0xffffffffUL;
    highest_paddr = 0UL;
    for (i = 0; sp_banks[i].num_bytes != 0; i++) {
        unsigned long top;

        if (sp_banks[i].base_addr < phys_base)
            phys_base = sp_banks[i].base_addr;
        top = sp_banks[i].base_addr +
            sp_banks[i].num_bytes;
        if (highest_paddr < top)
            highest_paddr = top;
    }
    pfn_base = phys_base >> PAGE_SHIFT;

    if (!root_flags)
        root_mountflags &= ~MS_RDONLY;
    ROOT_DEV = old_decode_dev(root_dev);
#ifdef CONFIG_BLK_DEV_RAM
    rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
    rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
    rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); 
#endif

    prom_setsync(prom_sync_me);

    if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
       ((*(short *)linux_dbvec) != -1)) {
        printk("Booted under KADB. Syncing trap table.\n");
        (*(linux_dbvec->teach_debugger))();
    }

    init_task.thread.kregs = &fake_swapper_regs;

    /* Run-time patch instructions to match the cpu model */
    per_cpu_patch();

    paging_init();

    smp_setup_cpu_possible_map();
}

extern int stop_a_enabled;

void sun_do_break(void)
{
    if (!stop_a_enabled)
        return;

    printk("\n");
    flush_user_windows();

    prom_cmdline();
}
EXPORT_SYMBOL(sun_do_break);

int stop_a_enabled = 1;

static int __init topology_init(void)
{
    int i, ncpus, err;

    /* Count the number of physically present processors in
     * the machine, even on uniprocessor, so that /proc/cpuinfo
     * output is consistent with 2.4.x
     */
    ncpus = 0;
    while (!cpu_find_by_instance(ncpus, NULL, NULL))
        ncpus++;
    ncpus_probed = ncpus;

    err = 0;
    for_each_online_cpu(i) {
        struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
        if (!p)
            err = -ENOMEM;
        else
            register_cpu(p, i);
    }

    return err;
}

subsys_initcall(topology_init);