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
63u_int32_t chksum(u_int32_t *, int);
64
65static int amiga_setboot(ib_params *);
66
67struct 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
75static int
76amiga_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
159u_int32_t
160chksum(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