geom_pc98.c revision 107970
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 * $FreeBSD: head/sys/geom/geom_pc98.c 107970 2002-12-17 15:50:51Z phk $
33 */
34
35#include <sys/param.h>
36#ifndef _KERNEL
37#include <signal.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <err.h>
42#else
43#include <sys/systm.h>
44#include <sys/kernel.h>
45#include <sys/malloc.h>
46#include <sys/bio.h>
47#include <sys/lock.h>
48#include <sys/mutex.h>
49#endif
50
51#include <sys/diskpc98.h>
52#include <geom/geom.h>
53#include <geom/geom_slice.h>
54
55#define PC98_CLASS_NAME "PC98"
56
57static void
58g_dec_dos_partition(u_char *ptr, struct dos_partition *d)
59{
60	u_int u;
61
62	d->dp_mid = ptr[0];
63	d->dp_sid = ptr[1];
64	d->dp_dum1 = ptr[2];
65	d->dp_dum2 = ptr[3];
66	d->dp_ipl_sct = ptr[4];
67	d->dp_ipl_head = ptr[5];
68	d->dp_ipl_cyl = g_dec_le2(ptr + 6);
69	d->dp_ssect = ptr[8];
70	d->dp_shd = ptr[9];
71	d->dp_scyl = g_dec_le2(ptr + 10);
72	d->dp_esect = ptr[12];
73	d->dp_ehd = ptr[13];
74	d->dp_ecyl = g_dec_le2(ptr + 14);
75	for (u = 0; u < sizeof(d->dp_name); u++)
76		d->dp_name[u] = ptr[16 + u];
77}
78
79struct g_pc98_softc {
80	int type [NDOSPART];
81	struct dos_partition dp[NDOSPART];
82};
83
84static int
85g_pc98_start(struct bio *bp)
86{
87	struct g_provider *pp;
88	struct g_geom *gp;
89	struct g_pc98_softc *mp;
90	struct g_slicer *gsp;
91	int idx;
92
93	pp = bp->bio_to;
94	idx = pp->index;
95	gp = pp->geom;
96	gsp = gp->softc;
97	mp = gsp->softc;
98	if (bp->bio_cmd == BIO_GETATTR) {
99		if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
100			return (1);
101		if (g_handleattr_off_t(bp, "PC98::offset",
102				       gsp->slices[idx].offset))
103			return (1);
104	}
105	return (0);
106}
107
108static void
109g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
110		struct g_consumer *cp __unused, struct g_provider *pp)
111{
112	struct g_pc98_softc *mp;
113	struct g_slicer *gsp;
114	char sname[17];
115
116	gsp = gp->softc;
117	mp = gsp->softc;
118	g_slice_dumpconf(sb, indent, gp, cp, pp);
119	if (pp != NULL) {
120		strncpy(sname, mp->dp[pp->index].dp_name, 16);
121		sname[16] = '\0';
122		if (indent == NULL) {
123			sbuf_printf(sb, " ty %d", mp->type[pp->index]);
124			sbuf_printf(sb, " sn %s", sname);
125		} else {
126			sbuf_printf(sb, "%s<type>%d</type>\n", indent,
127				    mp->type[pp->index]);
128			sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
129				    sname);
130		}
131	}
132}
133
134static void
135g_pc98_print(int i, struct dos_partition *dp)
136{
137	char sname[17];
138
139	strncpy(sname, dp->dp_name, 16);
140	sname[16] = '\0';
141
142	g_hexdump(dp, sizeof(dp[0]));
143	printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
144	       i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
145	printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
146	printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
147	printf(" sname:%s\n", sname);
148}
149
150static struct g_geom *
151g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
152{
153	struct g_geom *gp;
154	struct g_consumer *cp;
155	int error, i, npart;
156	struct g_pc98_softc *ms;
157	struct g_slicer *gsp;
158	u_int fwsectors, fwheads, sectorsize;
159	u_char *buf;
160	off_t spercyl;
161
162	g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
163	g_topology_assert();
164	if (flags == G_TF_NORMAL &&
165	    !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
166		return (NULL);
167	gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
168	if (gp == NULL)
169		return (NULL);
170	gsp = gp->softc;
171	g_topology_unlock();
172	gp->dumpconf = g_pc98_dumpconf;
173	npart = 0;
174	while (1) {	/* a trick to allow us to use break */
175		if (gp->rank != 2 && flags == G_TF_NORMAL)
176			break;
177		error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
178		if (error || fwsectors == 0) {
179			fwsectors = 17;
180			printf("g_pc98_taste: error %d guessing %d sectors\n",
181			    error, fwsectors);
182		}
183		error = g_getattr("GEOM::fwheads", cp, &fwheads);
184		if (error || fwheads == 0) {
185			fwheads = 8;
186			printf("g_pc98_taste: error %d guessing %d heads\n",
187			    error, fwheads);
188		}
189		sectorsize = cp->provider->sectorsize;
190		if (sectorsize < 512)
191			break;
192		gsp->frontstuff = sectorsize * fwsectors;
193		spercyl = (off_t)fwsectors * fwheads * sectorsize;
194		buf = g_read_data(cp, 0,
195		    sectorsize < 1024 ? 1024 : sectorsize, &error);
196		if (buf == NULL || error != 0)
197			break;
198		if (buf[0x1fe] != 0x55 || buf[0x1ff] != 0xaa) {
199			g_free(buf);
200			break;
201		}
202#if 0
203/*
204 * XXX: Some sources indicate this is a magic sequence, but appearantly
205 * XXX: it is not universal.  Documentation would be wonderfule to have.
206 */
207		if (buf[4] != 'I' || buf[5] != 'P' ||
208		    buf[6] != 'L' || buf[7] != '1') {
209			g_free(buf);
210			break;
211		}
212#endif
213		for (i = 0; i < NDOSPART; i++)
214			g_dec_dos_partition(
215				buf + 512 + i * sizeof(struct dos_partition),
216				ms->dp + i);
217		g_free(buf);
218		for (i = 0; i < NDOSPART; i++) {
219			/* If start and end are identical it's bogus */
220			if (ms->dp[i].dp_ssect == ms->dp[i].dp_esect &&
221			    ms->dp[i].dp_shd == ms->dp[i].dp_ehd &&
222			    ms->dp[i].dp_scyl == ms->dp[i].dp_ecyl)
223				continue;
224			if (ms->dp[i].dp_ecyl == 0)
225				continue;
226                        if (bootverbose) {
227				printf("PC98 Slice %d on %s:\n",
228				       i + 1, gp->name);
229				g_pc98_print(i, ms->dp + i);
230			}
231			npart++;
232			ms->type[i] = (ms->dp[i].dp_sid << 8) |
233				ms->dp[i].dp_mid;
234			g_topology_lock();
235			g_slice_config(gp, i, G_SLICE_CONFIG_SET,
236			    ms->dp[i].dp_scyl * spercyl,
237			    (ms->dp[i].dp_ecyl - ms->dp[i].dp_scyl + 1) *
238					       spercyl,
239			    sectorsize,
240			    "%ss%d", gp->name, i + 1);
241			g_topology_unlock();
242		}
243		break;
244	}
245	g_topology_lock();
246	g_access_rel(cp, -1, 0, 0);
247	if (LIST_EMPTY(&gp->provider)) {
248		g_std_spoiled(cp);
249		return (NULL);
250	}
251	return (gp);
252}
253
254static struct g_class g_pc98_class = {
255	PC98_CLASS_NAME,
256	g_pc98_taste,
257	NULL,
258	G_CLASS_INITIALIZER
259};
260
261DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);
262