bootxx.c revision 1.20 
1/*	$NetBSD: bootxx.c,v 1.20 2008/04/28 20:23:36 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#include <sys/param.h>
33#include <sys/exec.h>
34#include <sys/bootblock.h>
35
36#include <lib/libkern/libkern.h>
37#include <lib/libsa/stand.h>
38
39#include <machine/promlib.h>
40#include <sparc/stand/common/promdev.h>
41
42int debug;
43int netif_debug;
44
45/*
46 * Boot device is derived from ROM provided information.
47 */
48const char		progname[] = "bootxx";
49struct open_file	io;
50
51/*
52 * The contents of the bbinfo below are set by installboot(8)
53 * to hold the filesystem data of the second-stage boot program
54 * (typically `/boot'): filesystem block size, # of filesystem
55 * blocks and the block numbers themselves.
56 */
57struct shared_bbinfo bbinfo = {
58	{ SPARC_BBINFO_MAGIC },
59	0,
60	SHARED_BBINFO_MAXBLOCKS,
61	{ 0 }
62};
63
64int	main(void);
65void	loadboot(struct open_file *, char *);
66
67int
68main(void)
69{
70	char	*dummy1;
71	const char	*dummy;
72	void (*entry)(void *) = (void (*)(void *))PROM_LOADADDR;
73	void	*arg;
74
75#ifdef HEAP_VARIABLE
76	{
77		extern char end[];
78		setheap((void *)ALIGN(end), (void *)0xffffffff);
79	}
80#endif
81	prom_init();
82	dummy = prom_getbootpath();
83	if (dummy && *dummy != '\0')
84		strcpy(prom_bootdevice, dummy);
85	io.f_flags = F_RAW;
86	if (devopen(&io, 0, &dummy1)) {
87		panic("%s: can't open device `%s'", progname,
88			prom_bootdevice != NULL ? prom_bootdevice : "unknown");
89	}
90
91	(void)loadboot(&io, (void *)PROM_LOADADDR);
92	(io.f_dev->dv_close)(&io);
93
94	arg = (prom_version() == PROM_OLDMON) ? (void *)PROM_LOADADDR : romp;
95	(*entry)(arg);
96	_rtt();
97}
98
99void
100loadboot(struct open_file *f, char *addr)
101{
102	int	i;
103	char	*buf;
104	size_t		n;
105	daddr_t		blk;
106
107	/*
108	 * Allocate a buffer that we can map into DVMA space; only
109	 * needed for sun4 architecture, but use it for all machines
110	 * to keep code size down as much as possible.
111	 */
112	buf = alloc(bbinfo.bbi_block_size);
113	if (buf == NULL)
114		panic("%s: alloc failed", progname);
115
116	for (i = 0; i < bbinfo.bbi_block_count; i++) {
117		if ((blk = bbinfo.bbi_block_table[i]) == 0)
118			panic("%s: block table corrupt", progname);
119
120#ifdef DEBUG
121		printf("%s: block # %d = %d\n", progname, i, blk);
122#endif
123		if ((f->f_dev->dv_strategy)(f->f_devdata, F_READ, blk,
124		    bbinfo.bbi_block_size, buf, &n)) {
125			printf("%s: read failure", progname);
126			_rtt();
127		}
128		bcopy(buf, addr, bbinfo.bbi_block_size);
129		if (n != bbinfo.bbi_block_size)
130			panic("%s: short read", progname);
131		if (i == 0) {
132			int m = N_GETMAGIC(*(struct exec *)addr);
133			if (m == ZMAGIC || m == NMAGIC || m == OMAGIC) {
134				/* Move exec header out of the way */
135				bcopy(addr, addr - sizeof(struct exec), n);
136				addr -= sizeof(struct exec);
137			}
138		}
139		addr += n;
140	}
141
142}
143
144/*
145 * We don't need the overlap handling feature that the libkern version
146 * of bcopy() provides. We DO need code compactness..
147 */
148void
149bcopy(const void *src, void *dst, size_t n)
150{
151	const char *p = src;
152	char *q = dst;
153
154	while (n-- > 0)
155		*q++ = *p++;
156}
157