geom_pc98.c revision 138221 
1/*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/sys/geom/geom_pc98.c 138221 2004-11-30 09:40:11Z imp $");
35
36#include <sys/param.h>
37#include <sys/endian.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/malloc.h>
41#include <sys/bio.h>
42#include <sys/lock.h>
43#include <sys/mutex.h>
44
45#include <sys/diskpc98.h>
46#include <geom/geom.h>
47#include <geom/geom_slice.h>
48
49#define PC98_CLASS_NAME "PC98"
50
51struct g_pc98_softc {
52	u_int fwsectors, fwheads, sectorsize;
53	int type[NDOSPART];
54	u_char sec[8192];
55};
56
57static void
58g_pc98_print(int i, struct pc98_partition *dp)
59{
60	char sname[17];
61
62	strncpy(sname, dp->dp_name, 16);
63	sname[16] = '\0';
64
65	hexdump(dp, sizeof(dp[0]), NULL, 0);
66	printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
67	       i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
68	printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
69	printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
70	printf(" sname:%s\n", sname);
71}
72
73static int
74g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec)
75{
76	int i, error;
77	off_t s[NDOSPART], l[NDOSPART];
78	struct pc98_partition dp[NDOSPART];
79
80	g_topology_assert();
81
82	if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
83		return (EBUSY);
84
85#if 0
86	/*
87	 * By convetion, it seems that the ipl program has a jump at location
88	 * 0 to the real start of the boot loader.  By convetion, it appears
89	 * that after this jump, there's a string, terminated by at last one,
90	 * if not more, zeros, followed by the target of the jump.  FreeBSD's
91	 * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
92	 * compatibility with some older boot loader.  Linux98's boot loader
93	 * appears to use 'Linux 98' followed by only two.  GRUB/98 appears to
94	 * use 'GRUB/98 ' followed by none.  These last two appear to be
95	 * ported from the ia32 versions, but appear to show similar
96	 * convention.  Grub/98 has an additional NOP after the jmp, which
97	 * isn't present in others.
98	 *
99	 * The following test was inspired by looking only at partitions
100	 * with FreeBSD's boot0 (or one that it is compatible with).  As
101	 * such, if failed when other IPL programs were used.
102	 */
103	if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
104		return (EBUSY);
105#endif
106
107	for (i = 0; i < NDOSPART; i++)
108		pc98_partition_dec(
109			sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
110
111	for (i = 0; i < NDOSPART; i++) {
112		/* If start and end are identical it's bogus */
113		if (dp[i].dp_ssect == dp[i].dp_esect &&
114		    dp[i].dp_shd == dp[i].dp_ehd &&
115		    dp[i].dp_scyl == dp[i].dp_ecyl)
116			s[i] = l[i] = 0;
117		else if (dp[i].dp_ecyl == 0)
118			s[i] = l[i] = 0;
119		else {
120			s[i] = (off_t)dp[i].dp_scyl *
121				ms->fwsectors * ms->fwheads * ms->sectorsize;
122			l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
123				ms->fwsectors * ms->fwheads * ms->sectorsize;
124		}
125		if (bootverbose) {
126			printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
127			g_pc98_print(i, dp + i);
128		}
129		if (s[i] < 0 || l[i] < 0)
130			error = EBUSY;
131		else
132			error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
133				       s[i], l[i], ms->sectorsize,
134				       "%ss%d", gp->name, i + 1);
135		if (error)
136			return (error);
137	}
138
139	for (i = 0; i < NDOSPART; i++) {
140		ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
141		g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
142			       ms->sectorsize, "%ss%d", gp->name, i + 1);
143	}
144
145	bcopy(sec, ms->sec, sizeof (ms->sec));
146
147	return (0);
148}
149
150static int
151g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, struct thread *td)
152{
153	struct g_geom *gp;
154	struct g_pc98_softc *ms;
155	struct g_slicer *gsp;
156	struct g_consumer *cp;
157	int error;
158
159	gp = pp->geom;
160	gsp = gp->softc;
161	ms = gsp->softc;
162
163	switch(cmd) {
164	case DIOCSPC98: {
165		DROP_GIANT();
166		g_topology_lock();
167		/* Validate and modify our slicer instance to match. */
168		error = g_pc98_modify(gp, ms, data);
169		cp = LIST_FIRST(&gp->consumer);
170		error = g_write_data(cp, 0, data, 8192);
171		g_topology_unlock();
172		PICKUP_GIANT();
173		return(error);
174	}
175	default:
176		return (ENOIOCTL);
177	}
178}
179
180static int
181g_pc98_start(struct bio *bp)
182{
183	struct g_provider *pp;
184	struct g_geom *gp;
185	struct g_pc98_softc *mp;
186	struct g_slicer *gsp;
187	int idx;
188
189	pp = bp->bio_to;
190	idx = pp->index;
191	gp = pp->geom;
192	gsp = gp->softc;
193	mp = gsp->softc;
194	if (bp->bio_cmd == BIO_GETATTR) {
195		if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
196			return (1);
197		if (g_handleattr_off_t(bp, "PC98::offset",
198				       gsp->slices[idx].offset))
199			return (1);
200	}
201
202	return (0);
203}
204
205static void
206g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
207		struct g_consumer *cp __unused, struct g_provider *pp)
208{
209	struct g_pc98_softc *mp;
210	struct g_slicer *gsp;
211	struct pc98_partition dp;
212	char sname[17];
213
214	gsp = gp->softc;
215	mp = gsp->softc;
216	g_slice_dumpconf(sb, indent, gp, cp, pp);
217	if (pp != NULL) {
218		pc98_partition_dec(
219			mp->sec + 512 +
220			pp->index * sizeof(struct pc98_partition), &dp);
221		strncpy(sname, dp.dp_name, 16);
222		sname[16] = '\0';
223		if (indent == NULL) {
224			sbuf_printf(sb, " ty %d", mp->type[pp->index]);
225			sbuf_printf(sb, " sn %s", sname);
226		} else {
227			sbuf_printf(sb, "%s<type>%d</type>\n", indent,
228				    mp->type[pp->index]);
229			sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
230				    sname);
231		}
232	}
233}
234
235static struct g_geom *
236g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
237{
238	struct g_geom *gp;
239	struct g_consumer *cp;
240	int error;
241	struct g_pc98_softc *ms;
242	u_int fwsectors, fwheads, sectorsize;
243	u_char *buf;
244
245	g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
246	g_topology_assert();
247	if (flags == G_TF_NORMAL &&
248	    !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
249		return (NULL);
250	gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
251	if (gp == NULL)
252		return (NULL);
253	g_topology_unlock();
254	do {
255		if (gp->rank != 2 && flags == G_TF_NORMAL)
256			break;
257		error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
258		if (error || fwsectors == 0) {
259			fwsectors = 17;
260			if (bootverbose)
261				printf("g_pc98_taste: guessing %d sectors\n",
262				    fwsectors);
263		}
264		error = g_getattr("GEOM::fwheads", cp, &fwheads);
265		if (error || fwheads == 0) {
266			fwheads = 8;
267			if (bootverbose)
268				printf("g_pc98_taste: guessing %d heads\n",
269				    fwheads);
270		}
271		sectorsize = cp->provider->sectorsize;
272		if (sectorsize % 512 != 0)
273			break;
274		if (!strncmp(gp->name, "ad", 2)) {
275			u_int total_secs = cp->provider->mediasize/sectorsize;
276
277			if (total_secs < 17*8*65535) {
278				fwsectors = 17;
279				fwheads = 8;
280			}
281			else if (total_secs < 63*16*65535) {
282				if (fwsectors > 63)
283					fwsectors = 63;
284				if (fwheads > 16)
285					fwheads = 16;
286			}
287			else if (total_secs < 255*16*65535) {
288				fwsectors = 255;
289				if (fwheads > 16)
290					fwheads = 16;
291			}
292			else {
293				fwsectors = 255;
294				fwheads = 255;
295			}
296		}
297		buf = g_read_data(cp, 0, 8192, &error);
298		if (buf == NULL || error != 0)
299			break;
300		ms->fwsectors = fwsectors;
301		ms->fwheads = fwheads;
302		ms->sectorsize = sectorsize;
303		g_topology_lock();
304		g_pc98_modify(gp, ms, buf);
305		g_topology_unlock();
306		g_free(buf);
307		break;
308	} while (0);
309	g_topology_lock();
310	g_access(cp, -1, 0, 0);
311	if (LIST_EMPTY(&gp->provider)) {
312		g_slice_spoiled(cp);
313		return (NULL);
314	}
315	return (gp);
316}
317
318static struct g_class g_pc98_class = {
319	.name = PC98_CLASS_NAME,
320	.version = G_VERSION,
321	.taste = g_pc98_taste,
322	.dumpconf = g_pc98_dumpconf,
323	.ioctl = g_pc98_ioctl,
324};
325
326DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);
327