1 /* $NetBSD: amiga.c,v 1.10 2019/05/07 04:35:31 thorpej 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(__lint)
41 __RCSID("$NetBSD: amiga.c,v 1.10 2019/05/07 04:35:31 thorpej 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
63 u_int32_t chksum(u_int32_t *, int);
64
65 static int amiga_setboot(ib_params *);
66
67 struct ib_mach ib_mach_amiga = {
68 .name = "amiga",
69 .setboot = amiga_setboot,
70 .clearboot = no_clearboot,
71 .editboot = no_editboot,
72 .valid_flags = IB_STAGE1START | IB_STAGE2START | IB_COMMAND,
73 };
74
75 static int
amiga_setboot(ib_params * params)76 amiga_setboot(ib_params *params)
77 {
78 int retval;
79 ssize_t rv;
80 char *dline;
81 int sumlen;
82 u_int32_t sum2, sum16;
83
84 struct stat bootstrapsb;
85
86 u_int32_t block[128*16];
87
88 retval = 0;
89 if (fstat(params->s1fd, &bootstrapsb) == -1) {
90 warn("Examining `%s'", params->stage1);
91 goto done;
92 }
93 if (!S_ISREG(bootstrapsb.st_mode)) {
94 warnx("`%s' must be a regular file", params->stage1);
95 goto done;
96 }
97
98 rv = pread(params->s1fd, &block, sizeof(block), 0);
99 if (rv == -1) {
100 warn("Reading `%s'", params->stage1);
101 goto done;
102 } else if (rv != sizeof(block)) {
103 warnx("Reading `%s': short read", params->stage1);
104 goto done;
105 }
106
107 /* XXX the choices should not be hardcoded */
108
109 sum2 = chksum(block, 1024/4);
110 sum16 = chksum(block, 8192/4);
111
112 if (sum16 == 0xffffffff) {
113 sumlen = 8192/4;
114 } else if (sum2 == 0xffffffff) {
115 sumlen = 1024/4;
116 } else {
117 errx(1, "%s: wrong checksum", params->stage1);
118 /* NOTREACHED */
119 }
120
121 if (sum2 == sum16) {
122 warnx("eek - both sums are the same");
123 }
124
125 if (params->flags & IB_COMMAND) {
126 dline = (char *)&(block[CMDLN_LOC/4]);
127 /* XXX keep the default default line in sync with bbstart.s */
128 if (strcmp(dline, "netbsd -ASn2") != 0) {
129 errx(1, "Old bootblock version? Can't change command line.");
130 }
131 (void)strncpy(dline, params->command, CMDLN_LEN-1);
132
133 block[1] = htobe32(0);
134 block[1] = htobe32(0xffffffff - chksum(block, sumlen));
135 }
136
137 if (params->flags & IB_NOWRITE) {
138 retval = 1;
139 goto done;
140 }
141
142 if (params->flags & IB_VERBOSE)
143 printf("Writing boot block\n");
144 rv = pwrite(params->fsfd, &block, sizeof(block), 0);
145 if (rv == -1) {
146 warn("Writing `%s'", params->filesystem);
147 goto done;
148 } else if (rv != sizeof(block)) {
149 warnx("Writing `%s': short write", params->filesystem);
150 goto done;
151 } else {
152 retval = 1;
153 }
154
155 done:
156 return (retval);
157 }
158
159 u_int32_t
chksum(block,size)160 chksum(block, size)
161 u_int32_t *block;
162 int size;
163 {
164 u_int32_t sum, lastsum;
165 int i;
166
167 sum = 0;
168
169 for (i=0; i<size; i++) {
170 lastsum = sum;
171 sum += be32toh(block[i]);
172 if (sum < lastsum)
173 ++sum;
174 }
175
176 return sum;
177 }
178