geom_pc98.c revision 144333 
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 144333 2005-03-30 12:59:54Z nyan $");
35
36#include <sys/param.h>
37#include <sys/endian.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/fcntl.h>
41#include <sys/malloc.h>
42#include <sys/bio.h>
43#include <sys/lock.h>
44#include <sys/mutex.h>
45
46#include <sys/diskpc98.h>
47#include <geom/geom.h>
48#include <geom/geom_slice.h>
49
50#define PC98_CLASS_NAME "PC98"
51
52struct g_pc98_softc {
53	u_int fwsectors, fwheads, sectorsize;
54	int type[NDOSPART];
55	u_char sec[8192];
56};
57
58static void
59g_pc98_print(int i, struct pc98_partition *dp)
60{
61	char sname[17];
62
63	strncpy(sname, dp->dp_name, 16);
64	sname[16] = '\0';
65
66	hexdump(dp, sizeof(dp[0]), NULL, 0);
67	printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
68	       i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
69	printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
70	printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
71	printf(" sname:%s\n", sname);
72}
73
74static int
75g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec)
76{
77	int i, error;
78	off_t s[NDOSPART], l[NDOSPART];
79	struct pc98_partition dp[NDOSPART];
80
81	g_topology_assert();
82
83	if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
84		return (EBUSY);
85
86#if 0
87	/*
88	 * By convetion, it seems that the ipl program has a jump at location
89	 * 0 to the real start of the boot loader.  By convetion, it appears
90	 * that after this jump, there's a string, terminated by at last one,
91	 * if not more, zeros, followed by the target of the jump.  FreeBSD's
92	 * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
93	 * compatibility with some older boot loader.  Linux98's boot loader
94	 * appears to use 'Linux 98' followed by only two.  GRUB/98 appears to
95	 * use 'GRUB/98 ' followed by none.  These last two appear to be
96	 * ported from the ia32 versions, but appear to show similar
97	 * convention.  Grub/98 has an additional NOP after the jmp, which
98	 * isn't present in others.
99	 *
100	 * The following test was inspired by looking only at partitions
101	 * with FreeBSD's boot0 (or one that it is compatible with).  As
102	 * such, if failed when other IPL programs were used.
103	 */
104	if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
105		return (EBUSY);
106#endif
107
108	for (i = 0; i < NDOSPART; i++)
109		pc98_partition_dec(
110			sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
111
112	for (i = 0; i < NDOSPART; i++) {
113		/* If start and end are identical it's bogus */
114		if (dp[i].dp_ssect == dp[i].dp_esect &&
115		    dp[i].dp_shd == dp[i].dp_ehd &&
116		    dp[i].dp_scyl == dp[i].dp_ecyl)
117			s[i] = l[i] = 0;
118		else if (dp[i].dp_ecyl == 0)
119			s[i] = l[i] = 0;
120		else {
121			s[i] = (off_t)dp[i].dp_scyl *
122				ms->fwsectors * ms->fwheads * ms->sectorsize;
123			l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
124				ms->fwsectors * ms->fwheads * ms->sectorsize;
125		}
126		if (bootverbose) {
127			printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
128			g_pc98_print(i, dp + i);
129		}
130		if (s[i] < 0 || l[i] < 0)
131			error = EBUSY;
132		else
133			error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
134				       s[i], l[i], ms->sectorsize,
135				       "%ss%d", gp->name, i + 1);
136		if (error)
137			return (error);
138	}
139
140	for (i = 0; i < NDOSPART; i++) {
141		ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
142		g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
143			       ms->sectorsize, "%ss%d", gp->name, i + 1);
144	}
145
146	bcopy(sec, ms->sec, sizeof (ms->sec));
147
148	return (0);
149}
150
151static int
152g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
153{
154	struct g_geom *gp;
155	struct g_pc98_softc *ms;
156	struct g_slicer *gsp;
157	struct g_consumer *cp;
158	int error;
159
160	gp = pp->geom;
161	gsp = gp->softc;
162	ms = gsp->softc;
163
164	switch(cmd) {
165	case DIOCSPC98: {
166		if (!(fflag & FWRITE))
167			return (EPERM);
168		DROP_GIANT();
169		g_topology_lock();
170		/* Validate and modify our slicer instance to match. */
171		error = g_pc98_modify(gp, ms, data);
172		cp = LIST_FIRST(&gp->consumer);
173		error = g_write_data(cp, 0, data, 8192);
174		g_topology_unlock();
175		PICKUP_GIANT();
176		return(error);
177	}
178	default:
179		return (ENOIOCTL);
180	}
181}
182
183static int
184g_pc98_start(struct bio *bp)
185{
186	struct g_provider *pp;
187	struct g_geom *gp;
188	struct g_pc98_softc *mp;
189	struct g_slicer *gsp;
190	int idx;
191
192	pp = bp->bio_to;
193	idx = pp->index;
194	gp = pp->geom;
195	gsp = gp->softc;
196	mp = gsp->softc;
197	if (bp->bio_cmd == BIO_GETATTR) {
198		if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
199			return (1);
200		if (g_handleattr_off_t(bp, "PC98::offset",
201				       gsp->slices[idx].offset))
202			return (1);
203	}
204
205	return (0);
206}
207
208static void
209g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
210		struct g_consumer *cp __unused, struct g_provider *pp)
211{
212	struct g_pc98_softc *mp;
213	struct g_slicer *gsp;
214	struct pc98_partition dp;
215	char sname[17];
216
217	gsp = gp->softc;
218	mp = gsp->softc;
219	g_slice_dumpconf(sb, indent, gp, cp, pp);
220	if (pp != NULL) {
221		pc98_partition_dec(
222			mp->sec + 512 +
223			pp->index * sizeof(struct pc98_partition), &dp);
224		strncpy(sname, dp.dp_name, 16);
225		sname[16] = '\0';
226		if (indent == NULL) {
227			sbuf_printf(sb, " ty %d", mp->type[pp->index]);
228			sbuf_printf(sb, " sn %s", sname);
229		} else {
230			sbuf_printf(sb, "%s<type>%d</type>\n", indent,
231				    mp->type[pp->index]);
232			sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
233				    sname);
234		}
235	}
236}
237
238static struct g_geom *
239g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
240{
241	struct g_geom *gp;
242	struct g_consumer *cp;
243	int error;
244	struct g_pc98_softc *ms;
245	u_int fwsectors, fwheads, sectorsize;
246	u_char *buf;
247
248	g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
249	g_topology_assert();
250	if (flags == G_TF_NORMAL &&
251	    !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
252		return (NULL);
253	gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
254	if (gp == NULL)
255		return (NULL);
256	g_topology_unlock();
257	do {
258		if (gp->rank != 2 && flags == G_TF_NORMAL)
259			break;
260		error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
261		if (error || fwsectors == 0) {
262			fwsectors = 17;
263			if (bootverbose)
264				printf("g_pc98_taste: guessing %d sectors\n",
265				    fwsectors);
266		}
267		error = g_getattr("GEOM::fwheads", cp, &fwheads);
268		if (error || fwheads == 0) {
269			fwheads = 8;
270			if (bootverbose)
271				printf("g_pc98_taste: guessing %d heads\n",
272				    fwheads);
273		}
274		sectorsize = cp->provider->sectorsize;
275		if (sectorsize % 512 != 0)
276			break;
277		buf = g_read_data(cp, 0, 8192, &error);
278		if (buf == NULL || error != 0)
279			break;
280		ms->fwsectors = fwsectors;
281		ms->fwheads = fwheads;
282		ms->sectorsize = sectorsize;
283		g_topology_lock();
284		g_pc98_modify(gp, ms, buf);
285		g_topology_unlock();
286		g_free(buf);
287		break;
288	} while (0);
289	g_topology_lock();
290	g_access(cp, -1, 0, 0);
291	if (LIST_EMPTY(&gp->provider)) {
292		g_slice_spoiled(cp);
293		return (NULL);
294	}
295	return (gp);
296}
297
298static struct g_class g_pc98_class = {
299	.name = PC98_CLASS_NAME,
300	.version = G_VERSION,
301	.taste = g_pc98_taste,
302	.dumpconf = g_pc98_dumpconf,
303	.ioctl = g_pc98_ioctl,
304};
305
306DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);
307