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 22 int (*__rex_bootinit)(void); 23 int (*__rex_bootread)(void); 24 int (*__rex_getbitmap)(memmap *); 25 unsigned long *(*__rex_slot_address)(int); 26 void *(*__rex_gettcinfo)(void); 27 int (*__rex_getsysid)(void); 28 void (*__rex_clear_cache)(void); 29 30 int (*__prom_getchar)(void); 31 char *(*__prom_getenv)(char *); 32 int (*__prom_printf)(char *, ...); 33 34 int (*__pmax_open)(char*, int); 35 int (*__pmax_lseek)(int, long, int); 36 int (*__pmax_read)(int, void *, int); 37 int (*__pmax_close)(int); 38 39 40 /* 41 * Detect which PROM the DECSTATION has, and set the callback vectors 42 * appropriately. 43 */ 44 void __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 88 void __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