amiga.c revision 1.6 
1/*	$NetBSD: amiga.c,v 1.6 2008/04/28 20:24:16 martin Exp $	*/
2
3/*-
4 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Michael Hitch.
9 *
10 * This code is derived from software contributed to The NetBSD Foundation
11 * by Luke Mewburn of Wasabi Systems.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#if HAVE_NBTOOL_CONFIG_H
36#include "nbtool_config.h"
37#endif
38
39#include <sys/cdefs.h>
40#if defined(__RCSID) && !defined(__lint)
41__RCSID("$NetBSD: amiga.c,v 1.6 2008/04/28 20:24:16 martin Exp $");
42#endif	/* !__lint */
43
44#include <sys/param.h>
45#include <sys/stat.h>
46
47#include <assert.h>
48#include <err.h>
49#include <stddef.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <unistd.h>
53#include <string.h>
54
55#include "installboot.h"
56
57/* XXX Must be kept in sync with bbstart.s! */
58#define CMDLN_LOC 0x10
59#define CMDLN_LEN 0x20
60
61#define CHKSUMOFFS 1
62
63u_int32_t chksum(u_int32_t *, int);
64
65static int amiga_setboot(ib_params *);
66
67struct ib_mach ib_mach_amiga =
68	{ "amiga", amiga_setboot, no_clearboot, no_editboot,
69		IB_STAGE1START | IB_STAGE2START | IB_COMMAND };
70
71static int
72amiga_setboot(ib_params *params)
73{
74	int retval;
75	ssize_t			rv;
76	char *dline;
77	int sumlen;
78	u_int32_t sum2, sum16;
79
80	struct stat		bootstrapsb;
81
82	u_int32_t block[128*16];
83
84	retval = 0;
85	if (fstat(params->s1fd, &bootstrapsb) == -1) {
86		warn("Examining `%s'", params->stage1);
87		goto done;
88	}
89	if (!S_ISREG(bootstrapsb.st_mode)) {
90		warnx("`%s' must be a regular file", params->stage1);
91		goto done;
92	}
93
94	rv = pread(params->s1fd, &block, sizeof(block), 0);
95	if (rv == -1) {
96		warn("Reading `%s'", params->stage1);
97		goto done;
98	} else if (rv != sizeof(block)) {
99		warnx("Reading `%s': short read", params->stage1);
100		goto done;
101	}
102
103	/* XXX the choices should not be hardcoded */
104
105	sum2  = chksum(block, 1024/4);
106	sum16 = chksum(block, 8192/4);
107
108	if (sum16 == 0xffffffff) {
109		sumlen = 8192/4;
110	} else if (sum2 == 0xffffffff) {
111		sumlen = 1024/4;
112	} else {
113		errx(1, "%s: wrong checksum", params->stage1);
114		/* NOTREACHED */
115	}
116
117	if (sum2 == sum16) {
118		warnx("eek - both sums are the same");
119	}
120
121	if (params->flags & IB_COMMAND) {
122		dline = (char *)&(block[CMDLN_LOC/4]);
123		/* XXX keep the default default line in sync with bbstart.s */
124		if (strcmp(dline, "netbsd -ASn2") != 0) {
125			errx(1, "Old bootblock version? Can't change command line.");
126		}
127		(void)strncpy(dline, params->command, CMDLN_LEN-1);
128
129		block[1] = 0;
130		block[1] = 0xffffffff - chksum(block, sumlen);
131	}
132
133	if (params->flags & IB_NOWRITE) {
134		retval = 1;
135		goto done;
136	}
137
138	if (params->flags & IB_VERBOSE)
139		printf("Writing boot block\n");
140	rv = pwrite(params->fsfd, &block, sizeof(block), 0);
141	if (rv == -1) {
142		warn("Writing `%s'", params->filesystem);
143		goto done;
144	} else if (rv != sizeof(block)) {
145		warnx("Writing `%s': short write", params->filesystem);
146		goto done;
147	} else {
148		retval = 1;
149	}
150
151 done:
152	return (retval);
153}
154
155u_int32_t
156chksum(block, size)
157	u_int32_t *block;
158	int size;
159{
160	u_int32_t sum, lastsum;
161	int i;
162
163	sum = 0;
164
165	for (i=0; i<size; i++) {
166		lastsum = sum;
167		sum += htobe32(block[i]);
168		if (sum < lastsum)
169			++sum;
170	}
171
172	return sum;
173}
174