FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_pc98.c
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: releng/8.4/sys/geom/geom_pc98.c 235502 2012-05-16 09:03:29Z avg $");
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 #include <sys/proc.h>
46
47 #include <sys/diskpc98.h>
48 #include <geom/geom.h>
49 #include <geom/geom_slice.h>
50
51 #define PC98_CLASS_NAME "PC98"
52
53 struct g_pc98_softc {
54 u_int fwsectors, fwheads, sectorsize;
55 int type[NDOSPART];
56 u_char sec[8192];
57 };
58
59 static void
60 g_pc98_print(int i, struct pc98_partition *dp)
61 {
62 char sname[17];
63
64 strncpy(sname, dp->dp_name, 16);
65 sname[16] = '\0';
66
67 hexdump(dp, sizeof(dp[0]), NULL, 0);
68 printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
69 i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
70 printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
71 printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
72 printf(" sname:%s\n", sname);
73 }
74
75 /*
76 * XXX: Add gctl_req arg and give good error msgs.
77 * XXX: Check that length argument does not bring boot code inside any slice.
78 */
79 static int
80 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused)
81 {
82 int i, error;
83 off_t s[NDOSPART], l[NDOSPART];
84 struct pc98_partition dp[NDOSPART];
85
86 g_topology_assert();
87
88 if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
89 return (EBUSY);
90
91 #if 0
92 /*
93 * By convetion, it seems that the ipl program has a jump at location
94 * 0 to the real start of the boot loader. By convetion, it appears
95 * that after this jump, there's a string, terminated by at last one,
96 * if not more, zeros, followed by the target of the jump. FreeBSD's
97 * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
98 * compatibility with some older boot loader. Linux98's boot loader
99 * appears to use 'Linux 98' followed by only two. GRUB/98 appears to
100 * use 'GRUB/98 ' followed by none. These last two appear to be
101 * ported from the ia32 versions, but appear to show similar
102 * convention. Grub/98 has an additional NOP after the jmp, which
103 * isn't present in others.
104 *
105 * The following test was inspired by looking only at partitions
106 * with FreeBSD's boot0 (or one that it is compatible with). As
107 * such, if failed when other IPL programs were used.
108 */
109 if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
110 return (EBUSY);
111 #endif
112
113 for (i = 0; i < NDOSPART; i++)
114 pc98_partition_dec(
115 sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
116
117 for (i = 0; i < NDOSPART; i++) {
118 /* If start and end are identical it's bogus */
119 if (dp[i].dp_ssect == dp[i].dp_esect &&
120 dp[i].dp_shd == dp[i].dp_ehd &&
121 dp[i].dp_scyl == dp[i].dp_ecyl)
122 s[i] = l[i] = 0;
123 else if (dp[i].dp_ecyl == 0)
124 s[i] = l[i] = 0;
125 else {
126 s[i] = (off_t)dp[i].dp_scyl *
127 ms->fwsectors * ms->fwheads * ms->sectorsize;
128 l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
129 ms->fwsectors * ms->fwheads * ms->sectorsize;
130 }
131 if (bootverbose) {
132 printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
133 g_pc98_print(i, dp + i);
134 }
135 if (s[i] < 0 || l[i] < 0)
136 error = EBUSY;
137 else
138 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
139 s[i], l[i], ms->sectorsize,
140 "%ss%d", gp->name, i + 1);
141 if (error)
142 return (error);
143 }
144
145 for (i = 0; i < NDOSPART; i++) {
146 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
147 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
148 ms->sectorsize, "%ss%d", gp->name, i + 1);
149 }
150
151 bcopy(sec, ms->sec, sizeof (ms->sec));
152
153 return (0);
154 }
155
156 static int
157 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
158 {
159 struct g_geom *gp;
160 struct g_pc98_softc *ms;
161 struct g_slicer *gsp;
162 struct g_consumer *cp;
163 int error, opened;
164
165 gp = pp->geom;
166 gsp = gp->softc;
167 ms = gsp->softc;
168
169 opened = 0;
170 error = 0;
171 switch(cmd) {
172 case DIOCSPC98: {
173 if (!(fflag & FWRITE))
174 return (EPERM);
175 DROP_GIANT();
176 g_topology_lock();
177 cp = LIST_FIRST(&gp->consumer);
178 if (cp->acw == 0) {
179 error = g_access(cp, 0, 1, 0);
180 if (error == 0)
181 opened = 1;
182 }
183 if (!error)
184 error = g_pc98_modify(gp, ms, data, 8192);
185 if (!error)
186 error = g_write_data(cp, 0, data, 8192);
187 if (opened)
188 g_access(cp, 0, -1 , 0);
189 g_topology_unlock();
190 PICKUP_GIANT();
191 return(error);
192 }
193 default:
194 return (ENOIOCTL);
195 }
196 }
197
198 static int
199 g_pc98_start(struct bio *bp)
200 {
201 struct g_provider *pp;
202 struct g_geom *gp;
203 struct g_pc98_softc *mp;
204 struct g_slicer *gsp;
205 int idx;
206
207 pp = bp->bio_to;
208 idx = pp->index;
209 gp = pp->geom;
210 gsp = gp->softc;
211 mp = gsp->softc;
212 if (bp->bio_cmd == BIO_GETATTR) {
213 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
214 return (1);
215 if (g_handleattr_off_t(bp, "PC98::offset",
216 gsp->slices[idx].offset))
217 return (1);
218 }
219
220 return (0);
221 }
222
223 static void
224 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
225 struct g_consumer *cp __unused, struct g_provider *pp)
226 {
227 struct g_pc98_softc *mp;
228 struct g_slicer *gsp;
229 struct pc98_partition dp;
230 char sname[17];
231
232 gsp = gp->softc;
233 mp = gsp->softc;
234 g_slice_dumpconf(sb, indent, gp, cp, pp);
235 if (pp != NULL) {
236 pc98_partition_dec(
237 mp->sec + 512 +
238 pp->index * sizeof(struct pc98_partition), &dp);
239 strncpy(sname, dp.dp_name, 16);
240 sname[16] = '\0';
241 if (indent == NULL) {
242 sbuf_printf(sb, " ty %d", mp->type[pp->index]);
243 sbuf_printf(sb, " sn %s", sname);
244 } else {
245 sbuf_printf(sb, "%s<type>%d</type>\n", indent,
246 mp->type[pp->index]);
247 sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
248 sname);
249 }
250 }
251 }
252
253 static struct g_geom *
254 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
255 {
256 struct g_geom *gp;
257 struct g_consumer *cp;
258 int error;
259 struct g_pc98_softc *ms;
260 u_int fwsectors, fwheads, sectorsize;
261 u_char *buf;
262
263 g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
264 g_topology_assert();
265 if (flags == G_TF_NORMAL &&
266 !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
267 return (NULL);
268 gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
269 if (gp == NULL)
270 return (NULL);
271 g_topology_unlock();
272 do {
273 if (gp->rank != 2 && flags == G_TF_NORMAL)
274 break;
275 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
276 if (error || fwsectors == 0) {
277 fwsectors = 17;
278 if (bootverbose)
279 printf("g_pc98_taste: guessing %d sectors\n",
280 fwsectors);
281 }
282 error = g_getattr("GEOM::fwheads", cp, &fwheads);
283 if (error || fwheads == 0) {
284 fwheads = 8;
285 if (bootverbose)
286 printf("g_pc98_taste: guessing %d heads\n",
287 fwheads);
288 }
289 sectorsize = cp->provider->sectorsize;
290 if (sectorsize % 512 != 0)
291 break;
292 buf = g_read_data(cp, 0, 8192, NULL);
293 if (buf == NULL)
294 break;
295 ms->fwsectors = fwsectors;
296 ms->fwheads = fwheads;
297 ms->sectorsize = sectorsize;
298 g_topology_lock();
299 g_pc98_modify(gp, ms, buf, 8192);
300 g_topology_unlock();
301 g_free(buf);
302 break;
303 } while (0);
304 g_topology_lock();
305 g_access(cp, -1, 0, 0);
306 if (LIST_EMPTY(&gp->provider)) {
307 g_slice_spoiled(cp);
308 return (NULL);
309 }
310 return (gp);
311 }
312
313 static void
314 g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb)
315 {
316 struct g_geom *gp;
317 struct g_consumer *cp;
318 struct g_pc98_softc *ms;
319 struct g_slicer *gsp;
320 int opened = 0, error = 0;
321 void *data;
322 int len;
323
324 g_topology_assert();
325 gp = gctl_get_geom(req, mp, "geom");
326 if (gp == NULL)
327 return;
328 if (strcmp(verb, "write PC98")) {
329 gctl_error(req, "Unknown verb");
330 return;
331 }
332 gsp = gp->softc;
333 ms = gsp->softc;
334 data = gctl_get_param(req, "data", &len);
335 if (data == NULL)
336 return;
337 if (len < 8192 || (len % 512)) {
338 gctl_error(req, "Wrong request length");
339 return;
340 }
341 cp = LIST_FIRST(&gp->consumer);
342 if (cp->acw == 0) {
343 error = g_access(cp, 0, 1, 0);
344 if (error == 0)
345 opened = 1;
346 }
347 if (!error)
348 error = g_pc98_modify(gp, ms, data, len);
349 if (error)
350 gctl_error(req, "conflict with open slices");
351 if (!error)
352 error = g_write_data(cp, 0, data, len);
353 if (error)
354 gctl_error(req, "sector zero write failed");
355 if (opened)
356 g_access(cp, 0, -1 , 0);
357 return;
358 }
359
360 static struct g_class g_pc98_class = {
361 .name = PC98_CLASS_NAME,
362 .version = G_VERSION,
363 .taste = g_pc98_taste,
364 .dumpconf = g_pc98_dumpconf,
365 .ctlreq = g_pc98_config,
366 .ioctl = g_pc98_ioctl,
367 };
368
369 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);
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