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 23 int (*__rex_bootinit)(void); 24 int (*__rex_bootread)(void); 25 int (*__rex_getbitmap)(memmap *); 26 unsigned long *(*__rex_slot_address)(int); 27 void *(*__rex_gettcinfo)(void); 28 int (*__rex_getsysid)(void); 29 void (*__rex_clear_cache)(void); 30 31 int (*__prom_getchar)(void); 32 char *(*__prom_getenv)(char *); 33 int (*__prom_printf)(char *, ...); 34 35 int (*__pmax_open)(char*, int); 36 int (*__pmax_lseek)(int, long, int); 37 int (*__pmax_read)(int, void *, int); 38 int (*__pmax_close)(int); 39 40 41 /* 42 * Detect which PROM the DECSTATION has, and set the callback vectors 43 * appropriately. 44 */ 45 void __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 89 void __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