1 | // SPDX-License-Identifier: GPL-2.0 |
---|---|
2 | /* |
3 | * init.c: Initialize internal variables used by the PROM |
4 | * library functions. |
5 | * |
6 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
7 | * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
8 | */ |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/init.h> |
12 | #include <linux/module.h> |
13 | |
14 | #include <asm/openprom.h> |
15 | #include <asm/oplib.h> |
16 | |
17 | struct linux_romvec *romvec; |
18 | EXPORT_SYMBOL(romvec); |
19 | |
20 | enum prom_major_version prom_vers; |
21 | unsigned int prom_rev, prom_prev; |
22 | |
23 | /* The root node of the prom device tree. */ |
24 | phandle prom_root_node; |
25 | EXPORT_SYMBOL(prom_root_node); |
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. |
32 | * It gets passed the pointer to the PROM vector. |
33 | */ |
34 | |
35 | void __init prom_init(struct linux_romvec *rp) |
36 | { |
37 | romvec = rp; |
38 | |
39 | switch(romvec->pv_romvers) { |
40 | case 0: |
41 | prom_vers = PROM_V0; |
42 | break; |
43 | case 2: |
44 | prom_vers = PROM_V2; |
45 | break; |
46 | case 3: |
47 | prom_vers = PROM_V3; |
48 | break; |
49 | default: |
50 | prom_printf("PROMLIB: Bad PROM version %d\n", |
51 | romvec->pv_romvers); |
52 | prom_halt(); |
53 | break; |
54 | } |
55 | |
56 | prom_rev = romvec->pv_plugin_revision; |
57 | prom_prev = romvec->pv_printrev; |
58 | prom_nodeops = romvec->pv_nodeops; |
59 | |
60 | prom_root_node = prom_getsibling(0); |
61 | if ((prom_root_node == 0) || ((s32)prom_root_node == -1)) |
62 | prom_halt(); |
63 | |
64 | if((((unsigned long) prom_nodeops) == 0) || |
65 | (((unsigned long) prom_nodeops) == -1)) |
66 | prom_halt(); |
67 | |
68 | prom_meminit(); |
69 | |
70 | prom_ranges_init(); |
71 | |
72 | printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", |
73 | romvec->pv_romvers, prom_rev); |
74 | |
75 | /* Initialization successful. */ |
76 | } |
77 |