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1da177e4 LT |
1 | /* $Id: init.c,v 1.14 2000/01/29 01:09:12 anton Exp $ |
2 | * init.c: Initialize internal variables used by the PROM | |
3 | * library functions. | |
4 | * | |
5 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
6 | * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
7 | */ | |
8 | ||
9 | #include <linux/config.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
12 | ||
13 | #include <asm/openprom.h> | |
14 | #include <asm/oplib.h> | |
15 | #include <asm/sun4prom.h> | |
16 | ||
17 | struct linux_romvec *romvec; | |
18 | enum prom_major_version prom_vers; | |
19 | unsigned int prom_rev, prom_prev; | |
20 | linux_sun4_romvec *sun4_romvec; | |
21 | ||
22 | /* The root node of the prom device tree. */ | |
23 | int prom_root_node; | |
24 | ||
25 | int prom_stdin, prom_stdout; | |
26 | ||
27 | /* Pointer to the device tree operations structure. */ | |
28 | struct linux_nodeops *prom_nodeops; | |
29 | ||
30 | /* You must call prom_init() before you attempt to use any of the | |
31 | * routines in the prom library. It returns 0 on success, 1 on | |
32 | * failure. It gets passed the pointer to the PROM vector. | |
33 | */ | |
34 | ||
35 | extern void prom_meminit(void); | |
36 | extern void prom_ranges_init(void); | |
37 | ||
38 | void __init prom_init(struct linux_romvec *rp) | |
39 | { | |
40 | #ifdef CONFIG_SUN4 | |
41 | extern struct linux_romvec *sun4_prom_init(void); | |
42 | rp = sun4_prom_init(); | |
43 | #endif | |
44 | romvec = rp; | |
45 | ||
46 | switch(romvec->pv_romvers) { | |
47 | case 0: | |
48 | prom_vers = PROM_V0; | |
49 | break; | |
50 | case 2: | |
51 | prom_vers = PROM_V2; | |
52 | break; | |
53 | case 3: | |
54 | prom_vers = PROM_V3; | |
55 | break; | |
56 | case 40: | |
57 | prom_vers = PROM_SUN4; | |
58 | break; | |
59 | default: | |
60 | prom_printf("PROMLIB: Bad PROM version %d\n", | |
61 | romvec->pv_romvers); | |
62 | prom_halt(); | |
63 | break; | |
64 | }; | |
65 | ||
66 | prom_rev = romvec->pv_plugin_revision; | |
67 | prom_prev = romvec->pv_printrev; | |
68 | prom_nodeops = romvec->pv_nodeops; | |
69 | ||
70 | prom_root_node = prom_getsibling(0); | |
71 | if((prom_root_node == 0) || (prom_root_node == -1)) | |
72 | prom_halt(); | |
73 | ||
74 | if((((unsigned long) prom_nodeops) == 0) || | |
75 | (((unsigned long) prom_nodeops) == -1)) | |
76 | prom_halt(); | |
77 | ||
78 | if(prom_vers == PROM_V2 || prom_vers == PROM_V3) { | |
79 | prom_stdout = *romvec->pv_v2bootargs.fd_stdout; | |
80 | prom_stdin = *romvec->pv_v2bootargs.fd_stdin; | |
81 | } | |
82 | ||
83 | prom_meminit(); | |
84 | ||
85 | prom_ranges_init(); | |
86 | ||
87 | #ifndef CONFIG_SUN4 | |
88 | /* SUN4 prints this in sun4_prom_init */ | |
89 | printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", | |
90 | romvec->pv_romvers, prom_rev); | |
91 | #endif | |
92 | ||
93 | /* Initialization successful. */ | |
94 | return; | |
95 | } |