1/*
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/kernel.h>
10#include <linux/init.h>
11#include <linux/module.h>
12
13#include <asm/openprom.h>
14#include <asm/oplib.h>
15
16struct linux_romvec *romvec;
17EXPORT_SYMBOL(romvec);
18
19enum prom_major_version prom_vers;
20unsigned int prom_rev, prom_prev;
21
22/* The root node of the prom device tree. */
23phandle prom_root_node;
24EXPORT_SYMBOL(prom_root_node);
25
26/* Pointer to the device tree operations structure. */
27struct linux_nodeops *prom_nodeops;
28
29/* You must call prom_init() before you attempt to use any of the
30 * routines in the prom library.
31 * It gets passed the pointer to the PROM vector.
32 */
33
34void __init prom_init(struct linux_romvec *rp)
35{
36	romvec = rp;
37
38	switch(romvec->pv_romvers) {
39	case 0:
40		prom_vers = PROM_V0;
41		break;
42	case 2:
43		prom_vers = PROM_V2;
44		break;
45	case 3:
46		prom_vers = PROM_V3;
47		break;
48	default:
49		prom_printf("PROMLIB: Bad PROM version %d\n",
50			    romvec->pv_romvers);
51		prom_halt();
52		break;
53	}
54
55	prom_rev = romvec->pv_plugin_revision;
56	prom_prev = romvec->pv_printrev;
57	prom_nodeops = romvec->pv_nodeops;
58
59	prom_root_node = prom_getsibling(0);
60	if ((prom_root_node == 0) || ((s32)prom_root_node == -1))
61		prom_halt();
62
63	if((((unsigned long) prom_nodeops) == 0) ||
64	   (((unsigned long) prom_nodeops) == -1))
65		prom_halt();
66
67	prom_meminit();
68
69	prom_ranges_init();
70
71	printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
72	       romvec->pv_romvers, prom_rev);
73
74	/* Initialization successful. */
75}
76