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init.c

/*
 * init.c: PROM library initialisation code.
 *
 * Copyright (C) 1998 Harald Koerfgen
 * Copyright (C) 2002, 2004  Maciej W. Rozycki
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>

#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/processor.h>

#include <asm/dec/prom.h>


int (*__rex_bootinit)(void);
int (*__rex_bootread)(void);
int (*__rex_getbitmap)(memmap *);
unsigned long *(*__rex_slot_address)(int);
void *(*__rex_gettcinfo)(void);
int (*__rex_getsysid)(void);
void (*__rex_clear_cache)(void);

int (*__prom_getchar)(void);
char *(*__prom_getenv)(char *);
int (*__prom_printf)(char *, ...);

int (*__pmax_open)(char*, int);
int (*__pmax_lseek)(int, long, int);
int (*__pmax_read)(int, void *, int);
int (*__pmax_close)(int);


/*
 * Detect which PROM the DECSTATION has, and set the callback vectors
 * appropriately.
 */
void __init which_prom(s32 magic, s32 *prom_vec)
{
      /*
       * No sign of the REX PROM's magic number means we assume a non-REX
       * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
       */
      if (prom_is_rex(magic)) {
            /*
             * Set up prom abstraction structure with REX entry points.
             */
            __rex_bootinit =
                  (void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
            __rex_bootread =
                  (void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
            __rex_getbitmap =
                  (void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
            __prom_getchar =
                  (void *)(long)*(prom_vec + REX_PROM_GETCHAR);
            __prom_getenv =
                  (void *)(long)*(prom_vec + REX_PROM_GETENV);
            __rex_getsysid =
                  (void *)(long)*(prom_vec + REX_PROM_GETSYSID);
            __rex_gettcinfo =
                  (void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
            __prom_printf =
                  (void *)(long)*(prom_vec + REX_PROM_PRINTF);
            __rex_slot_address =
                  (void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
            __rex_clear_cache =
                  (void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
      } else {
            /*
             * Set up prom abstraction structure with non-REX entry points.
             */
            __prom_getchar = (void *)PMAX_PROM_GETCHAR;
            __prom_getenv = (void *)PMAX_PROM_GETENV;
            __prom_printf = (void *)PMAX_PROM_PRINTF;
            __pmax_open = (void *)PMAX_PROM_OPEN;
            __pmax_lseek = (void *)PMAX_PROM_LSEEK;
            __pmax_read = (void *)PMAX_PROM_READ;
            __pmax_close = (void *)PMAX_PROM_CLOSE;
      }
}

void __init prom_init(void)
{
      extern void dec_machine_halt(void);
      static char cpu_msg[] __initdata =
            "Sorry, this kernel is compiled for a wrong CPU type!\n";
      s32 argc = fw_arg0;
      s32 *argv = (void *)fw_arg1;
      u32 magic = fw_arg2;
      s32 *prom_vec = (void *)fw_arg3;

      /*
       * Determine which PROM we have
       * (and therefore which machine we're on!)
       */
      which_prom(magic, prom_vec);

      if (prom_is_rex(magic))
            rex_clear_cache();

      /* Register the early console.  */
      register_prom_console();

      /* Were we compiled with the right CPU option? */
#if defined(CONFIG_CPU_R3000)
      if ((current_cpu_type() == CPU_R4000SC) ||
          (current_cpu_type() == CPU_R4400SC)) {
            static char r4k_msg[] __initdata =
                  "Please recompile with \"CONFIG_CPU_R4x00 = y\".\n";
            printk(cpu_msg);
            printk(r4k_msg);
            dec_machine_halt();
      }
#endif

#if defined(CONFIG_CPU_R4X00)
      if ((current_cpu_type() == CPU_R3000) ||
          (current_cpu_type() == CPU_R3000A)) {
            static char r3k_msg[] __initdata =
                  "Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
            printk(cpu_msg);
            printk(r3k_msg);
            dec_machine_halt();
      }
#endif

      prom_meminit(magic);
      prom_identify_arch(magic);
      prom_init_cmdline(argc, argv, magic);
}

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