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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * init.c: PROM library initialisation code.
   4 *
   5 * Copyright (C) 1998 Harald Koerfgen
   6 * Copyright (C) 2002, 2004  Maciej W. Rozycki
   7 */
   8#include <linux/init.h>
   9#include <linux/kernel.h>
  10#include <linux/linkage.h>
  11#include <linux/smp.h>
  12#include <linux/string.h>
  13#include <linux/types.h>
  14
  15#include <asm/bootinfo.h>
  16#include <asm/cpu.h>
  17#include <asm/cpu-type.h>
  18#include <asm/processor.h>
  19
  20#include <asm/dec/prom.h>
  21
  22
  23int (*__rex_bootinit)(void);
  24int (*__rex_bootread)(void);
  25int (*__rex_getbitmap)(memmap *);
  26unsigned long *(*__rex_slot_address)(int);
  27void *(*__rex_gettcinfo)(void);
  28int (*__rex_getsysid)(void);
  29void (*__rex_clear_cache)(void);
  30
  31int (*__prom_getchar)(void);
  32char *(*__prom_getenv)(char *);
  33int (*__prom_printf)(char *, ...);
  34
  35int (*__pmax_open)(char*, int);
  36int (*__pmax_lseek)(int, long, int);
  37int (*__pmax_read)(int, void *, int);
  38int (*__pmax_close)(int);
  39
  40
  41/*
  42 * Detect which PROM the DECSTATION has, and set the callback vectors
  43 * appropriately.
  44 */
  45void __init which_prom(s32 magic, s32 *prom_vec)
  46{
  47        /*
  48         * No sign of the REX PROM's magic number means we assume a non-REX
  49         * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
  50         */
  51        if (prom_is_rex(magic)) {
  52                /*
  53                 * Set up prom abstraction structure with REX entry points.
  54                 */
  55                __rex_bootinit =
  56                        (void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
  57                __rex_bootread =
  58                        (void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
  59                __rex_getbitmap =
  60                        (void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
  61                __prom_getchar =
  62                        (void *)(long)*(prom_vec + REX_PROM_GETCHAR);
  63                __prom_getenv =
  64                        (void *)(long)*(prom_vec + REX_PROM_GETENV);
  65                __rex_getsysid =
  66                        (void *)(long)*(prom_vec + REX_PROM_GETSYSID);
  67                __rex_gettcinfo =
  68                        (void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
  69                __prom_printf =
  70                        (void *)(long)*(prom_vec + REX_PROM_PRINTF);
  71                __rex_slot_address =
  72                        (void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
  73                __rex_clear_cache =
  74                        (void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
  75        } else {
  76                /*
  77                 * Set up prom abstraction structure with non-REX entry points.
  78                 */
  79                __prom_getchar = (void *)PMAX_PROM_GETCHAR;
  80                __prom_getenv = (void *)PMAX_PROM_GETENV;
  81                __prom_printf = (void *)PMAX_PROM_PRINTF;
  82                __pmax_open = (void *)PMAX_PROM_OPEN;
  83                __pmax_lseek = (void *)PMAX_PROM_LSEEK;
  84                __pmax_read = (void *)PMAX_PROM_READ;
  85                __pmax_close = (void *)PMAX_PROM_CLOSE;
  86        }
  87}
  88
  89void __init prom_init(void)
  90{
  91        extern void dec_machine_halt(void);
  92        static const char cpu_msg[] __initconst =
  93                "Sorry, this kernel is compiled for a wrong CPU type!\n";
  94        s32 argc = fw_arg0;
  95        s32 *argv = (void *)fw_arg1;
  96        u32 magic = fw_arg2;
  97        s32 *prom_vec = (void *)fw_arg3;
  98
  99        /*
 100         * Determine which PROM we have
 101         * (and therefore which machine we're on!)
 102         */
 103        which_prom(magic, prom_vec);
 104
 105        if (prom_is_rex(magic))
 106                rex_clear_cache();
 107
 108        /* Register the early console.  */
 109        register_prom_console();
 110
 111        /* Were we compiled with the right CPU option? */
 112#if defined(CONFIG_CPU_R3000)
 113        if ((current_cpu_type() == CPU_R4000SC) ||
 114            (current_cpu_type() == CPU_R4400SC)) {
 115                static const char r4k_msg[] __initconst =
 116                        "Please recompile with \"CONFIG_CPU_R4x00 = y\".\n";
 117                printk(cpu_msg);
 118                printk(r4k_msg);
 119                dec_machine_halt();
 120        }
 121#endif
 122
 123#if defined(CONFIG_CPU_R4X00)
 124        if ((current_cpu_type() == CPU_R3000) ||
 125            (current_cpu_type() == CPU_R3000A)) {
 126                static const char r3k_msg[] __initconst =
 127                        "Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
 128                printk(cpu_msg);
 129                printk(r3k_msg);
 130                dec_machine_halt();
 131        }
 132#endif
 133
 134        prom_meminit(magic);
 135        prom_identify_arch(magic);
 136        prom_init_cmdline(argc, argv, magic);
 137}
 138