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