1/* $Id: init.c,v 1.1.1.1 2008/10/15 03:26:19 james26_jang 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) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/string.h>
12#include <linux/ctype.h>
13
14#include <asm/openprom.h>
15#include <asm/oplib.h>
16
17enum prom_major_version prom_vers;
18unsigned int prom_rev, prom_prev;
19
20/* The root node of the prom device tree. */
21int prom_root_node;
22int prom_stdin, prom_stdout;
23int prom_chosen_node;
24
25/* You must call prom_init() before you attempt to use any of the
26 * routines in the prom library.  It returns 0 on success, 1 on
27 * failure.  It gets passed the pointer to the PROM vector.
28 */
29
30extern void prom_meminit(void);
31extern void prom_cif_init(void *, void *);
32
33void __init prom_init(void *cif_handler, void *cif_stack)
34{
35	char buffer[80], *p;
36	int ints[3];
37	int node;
38	int i = 0;
39
40	prom_vers = PROM_P1275;
41
42	prom_cif_init(cif_handler, cif_stack);
43
44	prom_root_node = prom_getsibling(0);
45	if((prom_root_node == 0) || (prom_root_node == -1))
46		prom_halt();
47
48	prom_chosen_node = prom_finddevice("/chosen");
49	if (!prom_chosen_node || prom_chosen_node == -1)
50		prom_halt();
51
52	prom_stdin = prom_getint (prom_chosen_node, "stdin");
53	prom_stdout = prom_getint (prom_chosen_node, "stdout");
54
55	node = prom_finddevice("/openprom");
56	if (!node || node == -1)
57		prom_halt();
58
59	prom_getstring (node, "version", buffer, sizeof (buffer));
60
61	prom_printf ("\n");
62
63	if (strncmp (buffer, "OBP ", 4))
64		goto strange_version;
65
66	/* Version field is expected to be 'OBP xx.yy.zz date...' */
67
68	p = buffer + 4;
69	while (p && isdigit(*p) && i < 3) {
70		ints[i++] = simple_strtoul(p, NULL, 0);
71		if ((p = strchr(p, '.')) != NULL)
72			p++;
73	}
74	if (i != 3)
75		goto strange_version;
76
77	prom_rev = ints[1];
78	prom_prev = (ints[0] << 16) | (ints[1] << 8) | ints[2];
79
80	printk ("PROMLIB: Sun IEEE Boot Prom %s\n", buffer + 4);
81
82	prom_meminit();
83
84	/* Initialization successful. */
85	return;
86
87strange_version:
88	prom_printf ("Strange OBP version `%s'.\n", buffer);
89	prom_halt ();
90}
91