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 /* Register the early console. */ 107 register_prom_console(); 108 109 /* Were we compiled with the right CPU option? */ 110 #if defined(CONFIG_CPU_R3000) 111 if ((current_cpu_type() == CPU_R4000SC) || 112 (current_cpu_type() == CPU_R4400SC)) { 113 static char r4k_msg[] __initdata = 114 "Please recompile with \"CONFIG_CPU_R4x00 = y\".\n"; 115 printk(cpu_msg); 116 printk(r4k_msg); 117 dec_machine_halt(); 118 } 119 #endif 120 121 #if defined(CONFIG_CPU_R4X00) 122 if ((current_cpu_type() == CPU_R3000) || 123 (current_cpu_type() == CPU_R3000A)) { 124 static char r3k_msg[] __initdata = 125 "Please recompile with \"CONFIG_CPU_R3000 = y\".\n"; 126 printk(cpu_msg); 127 printk(r3k_msg); 128 dec_machine_halt(); 129 } 130 #endif 131 132 prom_meminit(magic); 133 prom_identify_arch(magic); 134 prom_init_cmdline(argc, argv, magic); 135 } 136