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, 2026 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 #ifdef CONFIG_64BIT 24 unsigned long o32_stk[O32_STK_SIZE] __initdata = { 0 }; 25 #endif 26 27 int (*__rex_bootinit)(void); 28 int (*__rex_bootread)(void); 29 int (*__rex_getbitmap)(memmap *); 30 unsigned long *(*__rex_slot_address)(int); 31 void *(*__rex_gettcinfo)(void); 32 int (*__rex_getsysid)(void); 33 void (*__rex_clear_cache)(void); 34 35 int (*__prom_getchar)(void); 36 char *(*__prom_getenv)(char *); 37 int (*__prom_printf)(char *, ...); 38 39 int (*__pmax_open)(char*, int); 40 int (*__pmax_lseek)(int, long, int); 41 int (*__pmax_read)(int, void *, int); 42 int (*__pmax_close)(int); 43 44 45 /* 46 * Detect which PROM the DECSTATION has, and set the callback vectors 47 * appropriately. 48 */ 49 static void __init which_prom(s32 magic, s32 *prom_vec) 50 { 51 /* 52 * No sign of the REX PROM's magic number means we assume a non-REX 53 * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx) 54 */ 55 if (prom_is_rex(magic)) { 56 /* 57 * Set up prom abstraction structure with REX entry points. 58 */ 59 __rex_bootinit = 60 (void *)(long)*(prom_vec + REX_PROM_BOOTINIT); 61 __rex_bootread = 62 (void *)(long)*(prom_vec + REX_PROM_BOOTREAD); 63 __rex_getbitmap = 64 (void *)(long)*(prom_vec + REX_PROM_GETBITMAP); 65 __prom_getchar = 66 (void *)(long)*(prom_vec + REX_PROM_GETCHAR); 67 __prom_getenv = 68 (void *)(long)*(prom_vec + REX_PROM_GETENV); 69 __rex_getsysid = 70 (void *)(long)*(prom_vec + REX_PROM_GETSYSID); 71 __rex_gettcinfo = 72 (void *)(long)*(prom_vec + REX_PROM_GETTCINFO); 73 __prom_printf = 74 (void *)(long)*(prom_vec + REX_PROM_PRINTF); 75 __rex_slot_address = 76 (void *)(long)*(prom_vec + REX_PROM_SLOTADDR); 77 __rex_clear_cache = 78 (void *)(long)*(prom_vec + REX_PROM_CLEARCACHE); 79 } else { 80 /* 81 * Set up prom abstraction structure with non-REX entry points. 82 */ 83 __prom_getchar = (void *)PMAX_PROM_GETCHAR; 84 __prom_getenv = (void *)PMAX_PROM_GETENV; 85 __prom_printf = (void *)PMAX_PROM_PRINTF; 86 __pmax_open = (void *)PMAX_PROM_OPEN; 87 __pmax_lseek = (void *)PMAX_PROM_LSEEK; 88 __pmax_read = (void *)PMAX_PROM_READ; 89 __pmax_close = (void *)PMAX_PROM_CLOSE; 90 } 91 } 92 93 void __init prom_init(void) 94 { 95 extern void dec_machine_halt(void); 96 static const char cpu_msg[] __initconst = 97 "Sorry, this kernel is compiled for a wrong CPU type!\n"; 98 s32 argc = fw_arg0; 99 s32 *argv = (void *)fw_arg1; 100 u32 magic = fw_arg2; 101 s32 *prom_vec = (void *)fw_arg3; 102 103 /* 104 * Determine which PROM we have 105 * (and therefore which machine we're on!) 106 */ 107 which_prom(magic, prom_vec); 108 109 if (prom_is_rex(magic)) 110 rex_clear_cache(); 111 112 /* Register the early console. */ 113 register_prom_console(); 114 115 /* Were we compiled with the right CPU option? */ 116 #if defined(CONFIG_CPU_R3000) 117 if ((current_cpu_type() == CPU_R4000SC) || 118 (current_cpu_type() == CPU_R4400SC)) { 119 static const char r4k_msg[] __initconst = 120 "Please recompile with \"CONFIG_CPU_R4X00 = y\".\n"; 121 printk(cpu_msg); 122 printk(r4k_msg); 123 dec_machine_halt(); 124 } 125 #endif 126 127 #if defined(CONFIG_CPU_R4X00) 128 if ((current_cpu_type() == CPU_R3000) || 129 (current_cpu_type() == CPU_R3000A)) { 130 static const char r3k_msg[] __initconst = 131 "Please recompile with \"CONFIG_CPU_R3000 = y\".\n"; 132 printk(cpu_msg); 133 printk(r3k_msg); 134 dec_machine_halt(); 135 } 136 #endif 137 138 prom_meminit(magic); 139 prom_identify_arch(magic); 140 prom_init_cmdline(argc, argv, magic); 141 } 142