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