1/*	$NetBSD: bootxx.c,v 1.15 2008/04/28 20:23:29 martin Exp $ */
2
3/*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Paul Kranenburg.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * This is a generic "first-stage" boot program.
34 *
35 * Note that this program has absolutely no filesystem knowledge!
36 *
37 * Instead, this uses a table of disk block numbers that are
38 * filled in by the installboot program such that this program
39 * can load the "second-stage" boot program.
40 */
41
42#include <sys/param.h>
43#include <sys/time.h>
44#include <sys/exec.h>
45#include <sys/exec_elf.h>
46#include <sys/exec_aout.h>
47#include <machine/prom.h>
48
49#include <lib/libsa/stand.h>
50#include "libsa.h"
51#include "bootxx.h"
52
53int copyboot(struct open_file *, u_long *);
54
55/*
56 * Boot device is derived from ROM provided information.
57 */
58#define LOADADDR	0x11000 /* where to load level 2 bootstrap */
59				/* (l2 must relocate itself) */
60
61extern int     	block_size;
62extern int     	block_count;	/* length of table */
63/* XXX ondisk32 */
64extern int32_t 	block_table[];
65
66extern		char bootprog_name[], bootprog_rev[];
67
68int main(void);
69
70int
71main(void)
72{
73	struct open_file f;
74	u_long addr;
75	char *foo;
76	int error;
77
78	printf("Boot: bug device: ctrl=%d, dev=%d\n",
79	    bugargs.ctrl_lun, bugargs.dev_lun);
80	printf("\nbootxx: %s first level bootstrap program [%s]\n\n",
81	    bootprog_name, bootprog_rev);
82
83	f.f_flags = F_RAW;
84	if (devopen(&f, 0, &foo)) {
85		printf("bootxx: open failed\n");
86		_rtt();
87	}
88
89	addr = LOADADDR;
90	error = copyboot(&f, &addr);
91	f.f_dev->dv_close(&f);
92	if (error == 0)
93		bugexec((void *)addr);
94
95	/* copyboot had a problem... */
96	_rtt();
97}
98
99int
100copyboot(struct open_file *fp, u_long *addr)
101{
102	int	i, blknum;
103	size_t	n;
104	char	*laddr = (char *) *addr;
105	union boothead {
106		struct exec ah;
107		Elf32_Ehdr eh;
108	} *x;
109
110	x = (union boothead *)laddr;
111
112	if (!block_count) {
113		printf("bootxx: no data!?!\n");
114		return -1;
115	}
116
117	for (i = 0; i < block_count; i++) {
118		if ((blknum = block_table[i]) == 0)
119			break;
120#ifdef DEBUG
121		printf("bootxx: read block # %d = %d\n", i, blknum);
122#endif
123		if ((fp->f_dev->dv_strategy)(fp->f_devdata, F_READ,
124		    blknum, block_size, laddr, &n)) {
125			printf("bootxx: read failed\n");
126			return -1;
127		}
128		if (n != block_size) {
129			printf("bootxx: short read\n");
130			return -1;
131		}
132		laddr += block_size;
133	}
134
135	if (N_GETMAGIC(x->ah) == OMAGIC)
136		*addr += sizeof(x->ah);
137	else if (memcmp(x->eh.e_ident, ELFMAG, SELFMAG) == 0) {
138		Elf32_Phdr *ep = (Elf32_Phdr *)(*addr + x->eh.e_phoff);
139		*addr += ep->p_offset;
140	} else {
141		printf("bootxx: secondary bootstrap isn't an executable\n");
142		return -1;
143	}
144
145	return 0;
146}
147