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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/cpu-type.h>
17 #include <asm/processor.h>
18 
19 #include <asm/dec/prom.h>
20 
21 
22 int (*__rex_bootinit)(void);
23 int (*__rex_bootread)(void);
24 int (*__rex_getbitmap)(memmap *);
25 unsigned long *(*__rex_slot_address)(int);
26 void *(*__rex_gettcinfo)(void);
27 int (*__rex_getsysid)(void);
28 void (*__rex_clear_cache)(void);
29 
30 int (*__prom_getchar)(void);
31 char *(*__prom_getenv)(char *);
32 int (*__prom_printf)(char *, ...);
33 
34 int (*__pmax_open)(char*, int);
35 int (*__pmax_lseek)(int, long, int);
36 int (*__pmax_read)(int, void *, int);
37 int (*__pmax_close)(int);
38 
39 
40 /*
41  * Detect which PROM the DECSTATION has, and set the callback vectors
42  * appropriately.
43  */
which_prom(s32 magic,s32 * prom_vec)44 void __init which_prom(s32 magic, s32 *prom_vec)
45 {
46 	/*
47 	 * No sign of the REX PROM's magic number means we assume a non-REX
48 	 * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
49 	 */
50 	if (prom_is_rex(magic)) {
51 		/*
52 		 * Set up prom abstraction structure with REX entry points.
53 		 */
54 		__rex_bootinit =
55 			(void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
56 		__rex_bootread =
57 			(void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
58 		__rex_getbitmap =
59 			(void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
60 		__prom_getchar =
61 			(void *)(long)*(prom_vec + REX_PROM_GETCHAR);
62 		__prom_getenv =
63 			(void *)(long)*(prom_vec + REX_PROM_GETENV);
64 		__rex_getsysid =
65 			(void *)(long)*(prom_vec + REX_PROM_GETSYSID);
66 		__rex_gettcinfo =
67 			(void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
68 		__prom_printf =
69 			(void *)(long)*(prom_vec + REX_PROM_PRINTF);
70 		__rex_slot_address =
71 			(void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
72 		__rex_clear_cache =
73 			(void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
74 	} else {
75 		/*
76 		 * Set up prom abstraction structure with non-REX entry points.
77 		 */
78 		__prom_getchar = (void *)PMAX_PROM_GETCHAR;
79 		__prom_getenv = (void *)PMAX_PROM_GETENV;
80 		__prom_printf = (void *)PMAX_PROM_PRINTF;
81 		__pmax_open = (void *)PMAX_PROM_OPEN;
82 		__pmax_lseek = (void *)PMAX_PROM_LSEEK;
83 		__pmax_read = (void *)PMAX_PROM_READ;
84 		__pmax_close = (void *)PMAX_PROM_CLOSE;
85 	}
86 }
87 
prom_init(void)88 void __init prom_init(void)
89 {
90 	extern void dec_machine_halt(void);
91 	static char cpu_msg[] __initdata =
92 		"Sorry, this kernel is compiled for a wrong CPU type!\n";
93 	s32 argc = fw_arg0;
94 	s32 *argv = (void *)fw_arg1;
95 	u32 magic = fw_arg2;
96 	s32 *prom_vec = (void *)fw_arg3;
97 
98 	/*
99 	 * Determine which PROM we have
100 	 * (and therefore which machine we're on!)
101 	 */
102 	which_prom(magic, prom_vec);
103 
104 	if (prom_is_rex(magic))
105 		rex_clear_cache();
106 
107 	/* Register the early console.  */
108 	register_prom_console();
109 
110 	/* Were we compiled with the right CPU option? */
111 #if defined(CONFIG_CPU_R3000)
112 	if ((current_cpu_type() == CPU_R4000SC) ||
113 	    (current_cpu_type() == CPU_R4400SC)) {
114 		static char r4k_msg[] __initdata =
115 			"Please recompile with \"CONFIG_CPU_R4x00 = y\".\n";
116 		printk(cpu_msg);
117 		printk(r4k_msg);
118 		dec_machine_halt();
119 	}
120 #endif
121 
122 #if defined(CONFIG_CPU_R4X00)
123 	if ((current_cpu_type() == CPU_R3000) ||
124 	    (current_cpu_type() == CPU_R3000A)) {
125 		static char r3k_msg[] __initdata =
126 			"Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
127 		printk(cpu_msg);
128 		printk(r3k_msg);
129 		dec_machine_halt();
130 	}
131 #endif
132 
133 	prom_meminit(magic);
134 	prom_identify_arch(magic);
135 	prom_init_cmdline(argc, argv, magic);
136 }
137