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setup.c

/*
 *  linux/arch/sparc64/kernel/setup.c
 *
 *  Copyright (C) 1995,1996  David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1997       Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#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 <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/inet.h>
#include <linux/console.h>
#include <linux/root_dev.h>
#include <linux/interrupt.h>
#include <linux/cpu.h>
#include <linux/initrd.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/idprom.h>
#include <asm/head.h>
#include <asm/starfire.h>
#include <asm/mmu_context.h>
#include <asm/timer.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/mmu.h>
#include <asm/ns87303.h>

#ifdef CONFIG_IP_PNP
#include <net/ipconfig.h>
#endif

#include "entry.h"

/* Used to synchronize accesses to NatSemi SUPER I/O chip configure
 * operations in asm/ns87303.h
 */
DEFINE_SPINLOCK(ns87303_lock);

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,          /* unused, ega_bx, unused */
      54,               /* orig-video-lines */
      0,                      /* orig-video-isVGA */
      16                      /* orig-video-points */
};

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

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

static struct console prom_early_console = {
      .name =           "earlyprom",
      .write =    prom_console_write,
      .flags =    CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
      .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':
      case 's':
            break;
      case 'h':
            prom_printf("boot_flags_init: Halt!\n");
            prom_halt();
            break;
      case 'p':
            /* Just ignore, this behavior is now the default.  */
            break;
      case 'P':
            /* Force UltraSPARC-III P-Cache on. */
            if (tlb_type != cheetah) {
                  printk("BOOT: Ignoring P-Cache force option.\n");
                  break;
            }
            cheetah_pcache_forced_on = 1;
            add_taint(TAINT_MACHINE_CHECK);
            cheetah_enable_pcache();
            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];

static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };

void __init per_cpu_patch(void)
{
      struct cpuid_patch_entry *p;
      unsigned long ver;
      int is_jbus;

      if (tlb_type == spitfire && !this_is_starfire)
            return;

      is_jbus = 0;
      if (tlb_type != hypervisor) {
            __asm__ ("rdpr %%ver, %0" : "=r" (ver));
            is_jbus = ((ver >> 32UL) == __JALAPENO_ID ||
                     (ver >> 32UL) == __SERRANO_ID);
      }

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

            switch (tlb_type) {
            case spitfire:
                  insns = &p->starfire[0];
                  break;
            case cheetah:
            case cheetah_plus:
                  if (is_jbus)
                        insns = &p->cheetah_jbus[0];
                  else
                        insns = &p->cheetah_safari[0];
                  break;
            case hypervisor:
                  insns = &p->sun4v[0];
                  break;
            default:
                  prom_printf("Unknown cpu type, halting.\n");
                  prom_halt();
            };

            *(unsigned int *) (addr +  0) = insns[0];
            wmb();
            __asm__ __volatile__("flush   %0" : : "r" (addr +  0));

            *(unsigned int *) (addr +  4) = insns[1];
            wmb();
            __asm__ __volatile__("flush   %0" : : "r" (addr +  4));

            *(unsigned int *) (addr +  8) = insns[2];
            wmb();
            __asm__ __volatile__("flush   %0" : : "r" (addr +  8));

            *(unsigned int *) (addr + 12) = insns[3];
            wmb();
            __asm__ __volatile__("flush   %0" : : "r" (addr + 12));

            p++;
      }
}

void __init sun4v_patch(void)
{
      extern void sun4v_hvapi_init(void);
      struct sun4v_1insn_patch_entry *p1;
      struct sun4v_2insn_patch_entry *p2;

      if (tlb_type != hypervisor)
            return;

      p1 = &__sun4v_1insn_patch;
      while (p1 < &__sun4v_1insn_patch_end) {
            unsigned long addr = p1->addr;

            *(unsigned int *) (addr +  0) = p1->insn;
            wmb();
            __asm__ __volatile__("flush   %0" : : "r" (addr +  0));

            p1++;
      }

      p2 = &__sun4v_2insn_patch;
      while (p2 < &__sun4v_2insn_patch_end) {
            unsigned long addr = p2->addr;

            *(unsigned int *) (addr +  0) = p2->insns[0];
            wmb();
            __asm__ __volatile__("flush   %0" : : "r" (addr +  0));

            *(unsigned int *) (addr +  4) = p2->insns[1];
            wmb();
            __asm__ __volatile__("flush   %0" : : "r" (addr +  4));

            p2++;
      }

      sun4v_hvapi_init();
}

#ifdef CONFIG_SMP
void __init boot_cpu_id_too_large(int cpu)
{
      prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
                cpu, NR_CPUS);
      prom_halt();
}
#endif

void __init setup_arch(char **cmdline_p)
{
      /* 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);

      if (tlb_type == hypervisor)
            printk("ARCH: SUN4V\n");
      else
            printk("ARCH: SUN4U\n");

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

      idprom_init();

      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

      task_thread_info(&init_task)->kregs = &fake_swapper_regs;

#ifdef CONFIG_IP_PNP
      if (!ic_set_manually) {
            int chosen = prom_finddevice ("/chosen");
            u32 cl, sv, gw;
            
            cl = prom_getintdefault (chosen, "client-ip", 0);
            sv = prom_getintdefault (chosen, "server-ip", 0);
            gw = prom_getintdefault (chosen, "gateway-ip", 0);
            if (cl && sv) {
                  ic_myaddr = cl;
                  ic_servaddr = sv;
                  if (gw)
                        ic_gateway = gw;
#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
                  ic_proto_enabled = 0;
#endif
            }
      }
#endif

      /* Get boot processor trap_block[] setup.  */
      init_cur_cpu_trap(current_thread_info());

      paging_init();
}

/* BUFFER is PAGE_SIZE bytes long. */

extern void smp_info(struct seq_file *);
extern void smp_bogo(struct seq_file *);
extern void mmu_info(struct seq_file *);

unsigned int dcache_parity_tl1_occurred;
unsigned int icache_parity_tl1_occurred;

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"
               "prom\t\t: %s\n"
               "type\t\t: %s\n"
               "ncpus probed\t: %d\n"
               "ncpus active\t: %d\n"
               "D$ parity tl1\t: %u\n"
               "I$ parity tl1\t: %u\n"
#ifndef CONFIG_SMP
               "Cpu0ClkTck\t: %016lx\n"
#endif
               ,
               sparc_cpu_type,
               sparc_fpu_type,
               prom_version,
               ((tlb_type == hypervisor) ?
                "sun4v" :
                "sun4u"),
               ncpus_probed,
               num_online_cpus(),
               dcache_parity_tl1_occurred,
               icache_parity_tl1_occurred
#ifndef CONFIG_SMP
               , 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;

      prom_printf("\n");
      flush_user_windows();

      prom_cmdline();
}

int stop_a_enabled = 1;

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