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 */
which_prom(s32 magic,s32 * prom_vec)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
prom_init(void)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