aboutsummaryrefslogtreecommitdiff
path: root/sys/geom/geom_pc98.c
blob: c80bd8a8ef5a11acd0b85dbdcc9a023f3086ffac (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
/*-
 * Copyright (c) 2002 Poul-Henning Kamp
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
 * and NAI Labs, the Security Research Division of Network Associates, Inc.
 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
 * DARPA CHATS research program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include <sys/param.h>
#include <sys/endian.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/lock.h>
#include <sys/mutex.h>

#include <sys/diskpc98.h>
#include <geom/geom.h>
#include <geom/geom_slice.h>

#define PC98_CLASS_NAME "PC98"

struct g_pc98_softc {
	u_int fwsectors, fwheads, sectorsize;
	int type[NDOSPART];
	u_char sec[8192];
};

static void
g_pc98_print(int i, struct pc98_partition *dp)
{
	char sname[17];

	strncpy(sname, dp->dp_name, 16);
	sname[16] = '\0';

	g_hexdump(dp, sizeof(dp[0]));
	printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
	       i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
	printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
	printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
	printf(" sname:%s\n", sname);
}

static int
g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec)
{
	int i, error;
	off_t s[NDOSPART], l[NDOSPART];
	struct pc98_partition dp[NDOSPART];

	g_topology_assert();
	
	if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
		return (EBUSY);

#if 0
	/*
	 * XXX: Some sources indicate this is a magic sequence, but appearantly
	 * XXX: it is not universal. Documentation would be wonderful to have.
	 */
	if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
		return (EBUSY);
#endif

	for (i = 0; i < NDOSPART; i++)
		pc98_partition_dec(
			sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);

	for (i = 0; i < NDOSPART; i++) {
		/* If start and end are identical it's bogus */
		if (dp[i].dp_ssect == dp[i].dp_esect &&
		    dp[i].dp_shd == dp[i].dp_ehd &&
		    dp[i].dp_scyl == dp[i].dp_ecyl)
			s[i] = l[i] = 0;
		else if (dp[i].dp_ecyl == 0)
			s[i] = l[i] = 0;
		else {
			s[i] = (off_t)dp[i].dp_scyl *
				ms->fwsectors * ms->fwheads * ms->sectorsize;
			l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
				ms->fwsectors * ms->fwheads * ms->sectorsize;
		}
		if (bootverbose) {
			printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
			g_pc98_print(i, dp + i);
		}
		if (s[i] < 0 || l[i] < 0)
			error = EBUSY;
		else
			error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
				       s[i], l[i], ms->sectorsize,
				       "%ss%d", gp->name, i + 1);
		if (error)
			return (error);
	}

	for (i = 0; i < NDOSPART; i++) {
		ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
		g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
			       ms->sectorsize, "%ss%d", gp->name, i + 1);
	}

	bcopy(sec, ms->sec, sizeof (ms->sec));

	return (0);
}

static void
g_pc98_ioctl(void *arg, int flag)
{
	struct bio *bp;
	struct g_geom *gp;
	struct g_slicer *gsp;
	struct g_pc98_softc *ms;
	struct g_ioctl *gio;
	struct g_consumer *cp;
	u_char *sec;
	int error;

	bp = arg;
	if (flag == EV_CANCEL) {
		g_io_deliver(bp, ENXIO);
		return;
	}
	gp = bp->bio_to->geom;
	gsp = gp->softc;
	ms = gsp->softc;
	gio = (struct g_ioctl *)bp->bio_data;

	/* The disklabel to set is the ioctl argument. */
	sec = gio->data;

	error = g_pc98_modify(gp, ms, sec);
	if (error) {
		g_io_deliver(bp, error);
		return;
	}
	cp = LIST_FIRST(&gp->consumer);
	error = g_write_data(cp, 0, sec, 8192);
	g_io_deliver(bp, error);
}

static int
g_pc98_start(struct bio *bp)
{
	struct g_provider *pp;
	struct g_geom *gp;
	struct g_pc98_softc *mp;
	struct g_slicer *gsp;
	struct g_ioctl *gio;
	int idx, error;

	pp = bp->bio_to;
	idx = pp->index;
	gp = pp->geom;
	gsp = gp->softc;
	mp = gsp->softc;
	if (bp->bio_cmd == BIO_GETATTR) {
		if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
			return (1);
		if (g_handleattr_off_t(bp, "PC98::offset",
				       gsp->slices[idx].offset))
			return (1);
	}

	/* We only handle ioctl(2) requests of the right format. */
	if (strcmp(bp->bio_attribute, "GEOM::ioctl"))
		return (0);
	else if (bp->bio_length != sizeof(*gio))
		return (0);
	/* Get hold of the ioctl parameters. */
	gio = (struct g_ioctl *)bp->bio_data;

	switch (gio->cmd) {
	case DIOCSPC98:
		/*
		 * These we cannot do without the topology lock and some
		 * some I/O requests.  Ask the event-handler to schedule
		 * us in a less restricted environment.
		 */
		error = g_post_event(g_pc98_ioctl, bp, M_NOWAIT, gp, NULL);
		if (error)
			g_io_deliver(bp, error);
		/*
		 * We must return non-zero to indicate that we will deal
		 * with this bio, even though we have not done so yet.
		 */
		return (1);
	default:
		return (0);
	}

	return (0);
}

static void
g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
		struct g_consumer *cp __unused, struct g_provider *pp)
{
	struct g_pc98_softc *mp;
	struct g_slicer *gsp;
	struct pc98_partition dp;
	char sname[17];

	gsp = gp->softc;
	mp = gsp->softc;
	g_slice_dumpconf(sb, indent, gp, cp, pp);
	if (pp != NULL) {
		pc98_partition_dec(
			mp->sec + 512 +
			pp->index * sizeof(struct pc98_partition), &dp);
		strncpy(sname, dp.dp_name, 16);
		sname[16] = '\0';
		if (indent == NULL) {
			sbuf_printf(sb, " ty %d", mp->type[pp->index]);
			sbuf_printf(sb, " sn %s", sname);
		} else {
			sbuf_printf(sb, "%s<type>%d</type>\n", indent,
				    mp->type[pp->index]);
			sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
				    sname);
		}
	}
}

static struct g_geom *
g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
{
	struct g_geom *gp;
	struct g_consumer *cp;
	int error;
	struct g_pc98_softc *ms;
	struct g_slicer *gsp;
	u_int fwsectors, fwheads, sectorsize;
	u_char *buf;

	g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
	g_topology_assert();
	if (flags == G_TF_NORMAL &&
	    !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
		return (NULL);
	gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
	if (gp == NULL)
		return (NULL);
	gsp = gp->softc;
	g_topology_unlock();
	gp->dumpconf = g_pc98_dumpconf;
	do {
		if (gp->rank != 2 && flags == G_TF_NORMAL)
			break;
		error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
		if (error || fwsectors == 0) {
			fwsectors = 17;
			if (bootverbose)
				printf("g_pc98_taste: guessing %d sectors\n",
				    fwsectors);
		}
		error = g_getattr("GEOM::fwheads", cp, &fwheads);
		if (error || fwheads == 0) {
			fwheads = 8;
			if (bootverbose)
				printf("g_pc98_taste: guessing %d heads\n",
				    fwheads);
		}
		sectorsize = cp->provider->sectorsize;
		if (sectorsize < 512)
			break;
		buf = g_read_data(cp, 0, 8192, &error);
		if (buf == NULL || error != 0)
			break;
		ms->fwsectors = fwsectors;
		ms->fwheads = fwheads;
		ms->sectorsize = sectorsize;
		g_topology_lock();
		g_pc98_modify(gp, ms, buf);
		g_topology_unlock();
		g_free(buf);
		break;
	} while (0);
	g_topology_lock();
	g_access_rel(cp, -1, 0, 0);
	if (LIST_EMPTY(&gp->provider)) {
		g_slice_spoiled(cp);
		return (NULL);
	}
	return (gp);
}

static struct g_class g_pc98_class = {
	.name = PC98_CLASS_NAME,
	.taste = g_pc98_taste,
	G_CLASS_INITIALIZER
};

DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);