pc98.c revision 272776 
1/*-
2 * Copyright (c) 2014 Juniper Networks, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/usr.bin/mkimg/pc98.c 272776 2014-10-08 22:13:18Z marcel $");
29
30#include <sys/types.h>
31#include <sys/diskpc98.h>
32#include <sys/endian.h>
33#include <sys/errno.h>
34#include <stdlib.h>
35#include <string.h>
36#include <unistd.h>
37
38#include "image.h"
39#include "mkimg.h"
40#include "scheme.h"
41
42#ifndef PC98_MAGIC
43#define	PC98_MAGIC		0xaa55
44#endif
45#ifndef PC98_MAGICOFS
46#define	PC98_MAGICOFS		510
47#endif
48#ifndef PC98_NPARTS
49#define	PC98_NPARTS		16
50#endif
51#ifndef PC98_PTYP_386BSD
52#define	PC98_PTYP_386BSD	0xc494
53#endif
54
55#define	PC98_BOOTCODESZ		8192
56
57static struct mkimg_alias pc98_aliases[] = {
58    {	ALIAS_FREEBSD, ALIAS_INT2TYPE(PC98_PTYP_386BSD) },
59    {	ALIAS_NONE, 0 }
60};
61
62static lba_t
63pc98_metadata(u_int where, lba_t blk)
64{
65	if (where == SCHEME_META_IMG_START)
66		blk += PC98_BOOTCODESZ / secsz;
67	return (round_track(blk));
68}
69
70static void
71pc98_chs(u_short *cylp, u_char *hdp, u_char *secp, lba_t lba)
72{
73	u_int cyl, hd, sec;
74
75	mkimg_chs(lba, 0xffff, &cyl, &hd, &sec);
76	le16enc(cylp, cyl);
77	*hdp = hd;
78	*secp = sec;
79}
80
81static int
82pc98_write(lba_t imgsz __unused, void *bootcode)
83{
84	struct part *part;
85	struct pc98_partition *dpbase, *dp;
86	u_char *buf;
87	lba_t size;
88	int error, ptyp;
89
90	buf = malloc(PC98_BOOTCODESZ);
91	if (buf == NULL)
92		return (ENOMEM);
93	if (bootcode != NULL) {
94		memcpy(buf, bootcode, PC98_BOOTCODESZ);
95		memset(buf + secsz, 0, secsz);
96	} else
97		memset(buf, 0, PC98_BOOTCODESZ);
98	le16enc(buf + PC98_MAGICOFS, PC98_MAGIC);
99	dpbase = (void *)(buf + secsz);
100	STAILQ_FOREACH(part, &partlist, link) {
101		size = round_track(part->size);
102		dp = dpbase + part->index;
103		ptyp = ALIAS_TYPE2INT(part->type);
104		dp->dp_mid = ptyp;
105		dp->dp_sid = ptyp >> 8;
106		pc98_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect,
107		    part->block);
108		pc98_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect,
109		    part->block + size - 1);
110		if (part->label != NULL)
111			memcpy(dp->dp_name, part->label, strlen(part->label));
112	}
113	error = image_write(0, buf, PC98_BOOTCODESZ / secsz);
114	free(buf);
115	return (error);
116}
117
118static struct mkimg_scheme pc98_scheme = {
119	.name = "pc98",
120	.description = "PC-9800 disk partitions",
121	.aliases = pc98_aliases,
122	.metadata = pc98_metadata,
123	.write = pc98_write,
124	.bootcode = PC98_BOOTCODESZ,
125	.labellen = 16,
126	.nparts = PC98_NPARTS,
127	.maxsecsz = 512
128};
129
130SCHEME_DEFINE(pc98_scheme);
131