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setup.c

/*
 *  linux/arch/sparc/kernel/setup.c
 *
 *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 2000  Anton Blanchard (anton@samba.org)
 */

#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 <asm/system.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/machines.h>
#include <asm/cpudata.h>
#include <asm/setup.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();
      if(current->pid != 0) {
            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);

      return;
}

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;

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

static struct console prom_debug_console = {
      .name =           "debug",
      .write =    prom_console_write,
      .flags =    CON_PRINTBUFFER,
      .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':
            /* Use PROM debug console. */
            register_console(&prom_debug_console);
            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++;
      }
}

/* This routine will in the future do all the nasty prom stuff
 * to probe for the mmu type and its parameters, etc. This will
 * also be where SMP things happen.
 */

extern void sun4c_probe_vac(void);
extern char cputypval;
extern unsigned long start, end;

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];
enum sparc_cpu sparc_cpu_model;

struct tt_entry *sparc_ttable;

struct pt_regs fake_swapper_regs;

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

      sparc_ttable = (struct tt_entry *) &start;

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

      /* Set sparc_cpu_model */
      sparc_cpu_model = sun_unknown;
      if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
      if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
      if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
      if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
      if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
      if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
      if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }

#ifdef CONFIG_SUN4
      if (sparc_cpu_model != sun4) {
            prom_printf("This kernel is for Sun4 architecture only.\n");
            prom_halt();
      }
#endif
      printk("ARCH: ");
      switch(sparc_cpu_model) {
      case sun4:
            printk("SUN4\n");
            break;
      case sun4c:
            printk("SUN4C\n");
            break;
      case sun4m:
            printk("SUN4M\n");
            break;
      case sun4d:
            printk("SUN4D\n");
            break;
      case sun4e:
            printk("SUN4E\n");
            break;
      case sun4u:
            printk("SUN4U\n");
            break;
      default:
            printk("UNKNOWN!\n");
            break;
      };

#ifdef CONFIG_DUMMY_CONSOLE
      conswitchp = &dummy_con;
#elif defined(CONFIG_PROM_CONSOLE)
      conswitchp = &prom_con;
#endif
      boot_flags_init(*cmdline_p);

      idprom_init();
      if (ARCH_SUN4C_SUN4)
            sun4c_probe_vac();
      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_mm.context = (unsigned long) NO_CONTEXT;
      init_task.thread.kregs = &fake_swapper_regs;

      paging_init();

      smp_setup_cpu_possible_map();
}

extern char *sparc_cpu_type;
extern char *sparc_fpu_type;

static int ncpus_probed;

static int show_cpuinfo(struct seq_file *m, void *__unused)
{
      seq_printf(m,
               "cpu\t\t: %s\n"
               "fpu\t\t: %s\n"
               "promlib\t\t: Version %d Revision %d\n"
               "prom\t\t: %d.%d\n"
               "type\t\t: %s\n"
               "ncpus probed\t: %d\n"
               "ncpus active\t: %d\n"
#ifndef CONFIG_SMP
               "CPU0Bogo\t: %lu.%02lu\n"
               "CPU0ClkTck\t: %ld\n"
#endif
               ,
               sparc_cpu_type ? sparc_cpu_type : "undetermined",
               sparc_fpu_type ? sparc_fpu_type : "undetermined",
               romvec->pv_romvers,
               prom_rev,
               romvec->pv_printrev >> 16,
               romvec->pv_printrev & 0xffff,
               &cputypval,
               ncpus_probed,
               num_online_cpus()
#ifndef CONFIG_SMP
               , cpu_data(0).udelay_val/(500000/HZ),
               (cpu_data(0).udelay_val/(5000/HZ)) % 100,
               cpu_data(0).clock_tick
#endif
            );

#ifdef CONFIG_SMP
      smp_bogo(m);
#endif
      mmu_info(m);
#ifdef CONFIG_SMP
      smp_info(m);
#endif
      return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
      /* The pointer we are returning is arbitrary,
       * it just has to be non-NULL and not IS_ERR
       * in the success case.
       */
      return *pos == 0 ? &c_start : 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,
};

extern int stop_a_enabled;

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

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

      prom_cmdline();
}

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);

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