LXR linux/arch/mips/dec/prom/init.c

   1/*
   2 * init.c: PROM library initialisation code.
   3 *
   4 * Copyright (C) 1998 Harald Koerfgen
   5 * Copyright (C) 2002, 2004  Maciej W. Rozycki
   6 */
   7#include <linux/init.h>
   8#include <linux/kernel.h>
   9#include <linux/linkage.h>
  10#include <linux/smp.h>
  11#include <linux/string.h>
  12#include <linux/types.h>
  13
  14#include <asm/bootinfo.h>
  15#include <asm/cpu.h>
  16#include <asm/cpu-type.h>
  17#include <asm/processor.h>
  18
  19#include <asm/dec/prom.h>
  20
  21
  22int (*__rex_bootinit)(void);
  23int (*__rex_bootread)(void);
  24int (*__rex_getbitmap)(memmap *);
  25unsigned long *(*__rex_slot_address)(int);
  26void *(*__rex_gettcinfo)(void);
  27int (*__rex_getsysid)(void);
  28void (*__rex_clear_cache)(void);
  29
  30int (*__prom_getchar)(void);
  31char *(*__prom_getenv)(char *);
  32int (*__prom_printf)(char *, ...);
  33
  34int (*__pmax_open)(char*, int);
  35int (*__pmax_lseek)(int, long, int);
  36int (*__pmax_read)(int, void *, int);
  37int (*__pmax_close)(int);
  38
  39
  40/*
  41 * Detect which PROM the DECSTATION has, and set the callback vectors
  42 * appropriately.
  43 */
  44void __init which_prom(s32 magic, s32 *prom_vec)
  45{
  46        /*
  47         * No sign of the REX PROM's magic number means we assume a non-REX
  48         * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
  49         */
  50        if (prom_is_rex(magic)) {
  51                /*
  52                 * Set up prom abstraction structure with REX entry points.
  53                 */
  54                __rex_bootinit =
  55                        (void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
  56                __rex_bootread =
  57                        (void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
  58                __rex_getbitmap =
  59                        (void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
  60                __prom_getchar =
  61                        (void *)(long)*(prom_vec + REX_PROM_GETCHAR);
  62                __prom_getenv =
  63                        (void *)(long)*(prom_vec + REX_PROM_GETENV);
  64                __rex_getsysid =
  65                        (void *)(long)*(prom_vec + REX_PROM_GETSYSID);
  66                __rex_gettcinfo =
  67                        (void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
  68                __prom_printf =
  69                        (void *)(long)*(prom_vec + REX_PROM_PRINTF);
  70                __rex_slot_address =
  71                        (void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
  72                __rex_clear_cache =
  73                        (void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
  74        } else {
  75                /*
  76                 * Set up prom abstraction structure with non-REX entry points.
  77                 */
  78                __prom_getchar = (void *)PMAX_PROM_GETCHAR;
  79                __prom_getenv = (void *)PMAX_PROM_GETENV;
  80                __prom_printf = (void *)PMAX_PROM_PRINTF;
  81                __pmax_open = (void *)PMAX_PROM_OPEN;
  82                __pmax_lseek = (void *)PMAX_PROM_LSEEK;
  83                __pmax_read = (void *)PMAX_PROM_READ;
  84                __pmax_close = (void *)PMAX_PROM_CLOSE;
  85        }
  86}
  87
  88void __init prom_init(void)
  89{
  90        extern void dec_machine_halt(void);
  91        static const char cpu_msg[] __initconst =
  92                "Sorry, this kernel is compiled for a wrong CPU type!\n";
  93        s32 argc = fw_arg0;
  94        s32 *argv = (void *)fw_arg1;
  95        u32 magic = fw_arg2;
  96        s32 *prom_vec = (void *)fw_arg3;
  97
  98        /*
  99         * Determine which PROM we have
 100         * (and therefore which machine we're on!)
 101         */
 102        which_prom(magic, prom_vec);
 103
 104        if (prom_is_rex(magic))
 105                rex_clear_cache();
 106
 107        /* Register the early console.  */
 108        register_prom_console();
 109
 110        /* Were we compiled with the right CPU option? */
 111#if defined(CONFIG_CPU_R3000)
 112        if ((current_cpu_type() == CPU_R4000SC) ||
 113            (current_cpu_type() == CPU_R4400SC)) {
 114                static const char r4k_msg[] __initconst =
 115                        "Please recompile with \"CONFIG_CPU_R4x00 = y\".\n";
 116                printk(cpu_msg);
 117                printk(r4k_msg);
 118                dec_machine_halt();
 119        }
 120#endif
 121
 122#if defined(CONFIG_CPU_R4X00)
 123        if ((current_cpu_type() == CPU_R3000) ||
 124            (current_cpu_type() == CPU_R3000A)) {
 125                static const char r3k_msg[] __initconst =
 126                        "Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
 127                printk(cpu_msg);
 128                printk(r3k_msg);
 129                dec_machine_halt();
 130        }
 131#endif
 132
 133        prom_meminit(magic);
 134        prom_identify_arch(magic);
 135        prom_init_cmdline(argc, argv, magic);
 136}
 137