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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.