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/9.0/sys/geom/geom_pc98.c 223921 2011-07-11 05:22:31Z ae $");
35
36 #include <sys/param.h>
37 #include <sys/endian.h>
38 #include <sys/systm.h>
39 #include <sys/sysctl.h>
40 #include <sys/kernel.h>
41 #include <sys/fcntl.h>
42 #include <sys/malloc.h>
43 #include <sys/bio.h>
44 #include <sys/lock.h>
45 #include <sys/mutex.h>
46 #include <sys/sbuf.h>
47
48 #include <sys/diskpc98.h>
49 #include <geom/geom.h>
50 #include <geom/geom_slice.h>
51
52 FEATURE(geom_pc98, "GEOM NEC PC9800 partitioning support");
53
54 #define PC98_CLASS_NAME "PC98"
55
56 struct g_pc98_softc {
57 u_int fwsectors, fwheads, sectorsize;
58 int type[NDOSPART];
59 u_char sec[8192];
60 };
61
62 static void
63 g_pc98_print(int i, struct pc98_partition *dp)
64 {
65 char sname[17];
66
67 strncpy(sname, dp->dp_name, 16);
68 sname[16] = '\0';
69
70 hexdump(dp, sizeof(dp[0]), NULL, 0);
71 printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
72 i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
73 printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
74 printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
75 printf(" sname:%s\n", sname);
76 }
77
78 /*
79 * XXX: Add gctl_req arg and give good error msgs.
80 * XXX: Check that length argument does not bring boot code inside any slice.
81 */
82 static int
83 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused)
84 {
85 int i, error;
86 off_t s[NDOSPART], l[NDOSPART];
87 struct pc98_partition dp[NDOSPART];
88
89 g_topology_assert();
90
91 if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
92 return (EBUSY);
93
94 #if 0
95 /*
96 * By convetion, it seems that the ipl program has a jump at location
97 * 0 to the real start of the boot loader. By convetion, it appears
98 * that after this jump, there's a string, terminated by at last one,
99 * if not more, zeros, followed by the target of the jump. FreeBSD's
100 * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
101 * compatibility with some older boot loader. Linux98's boot loader
102 * appears to use 'Linux 98' followed by only two. GRUB/98 appears to
103 * use 'GRUB/98 ' followed by none. These last two appear to be
104 * ported from the ia32 versions, but appear to show similar
105 * convention. Grub/98 has an additional NOP after the jmp, which
106 * isn't present in others.
107 *
108 * The following test was inspired by looking only at partitions
109 * with FreeBSD's boot0 (or one that it is compatible with). As
110 * such, if failed when other IPL programs were used.
111 */
112 if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
113 return (EBUSY);
114 #endif
115
116 for (i = 0; i < NDOSPART; i++)
117 pc98_partition_dec(
118 sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
119
120 for (i = 0; i < NDOSPART; i++) {
121 /* If start and end are identical it's bogus */
122 if (dp[i].dp_ssect == dp[i].dp_esect &&
123 dp[i].dp_shd == dp[i].dp_ehd &&
124 dp[i].dp_scyl == dp[i].dp_ecyl)
125 s[i] = l[i] = 0;
126 else if (dp[i].dp_ecyl == 0)
127 s[i] = l[i] = 0;
128 else {
129 s[i] = (off_t)dp[i].dp_scyl *
130 ms->fwsectors * ms->fwheads * ms->sectorsize;
131 l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
132 ms->fwsectors * ms->fwheads * ms->sectorsize;
133 }
134 if (bootverbose) {
135 printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
136 g_pc98_print(i, dp + i);
137 }
138 if (s[i] < 0 || l[i] < 0)
139 error = EBUSY;
140 else
141 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
142 s[i], l[i], ms->sectorsize,
143 "%ss%d", gp->name, i + 1);
144 if (error)
145 return (error);
146 }
147
148 for (i = 0; i < NDOSPART; i++) {
149 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
150 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
151 ms->sectorsize, "%ss%d", gp->name, i + 1);
152 }
153
154 bcopy(sec, ms->sec, sizeof (ms->sec));
155
156 return (0);
157 }
158
159 static int
160 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
161 {
162 struct g_geom *gp;
163 struct g_pc98_softc *ms;
164 struct g_slicer *gsp;
165 struct g_consumer *cp;
166 int error, opened;
167
168 gp = pp->geom;
169 gsp = gp->softc;
170 ms = gsp->softc;
171
172 opened = 0;
173 error = 0;
174 switch(cmd) {
175 case DIOCSPC98: {
176 if (!(fflag & FWRITE))
177 return (EPERM);
178 DROP_GIANT();
179 g_topology_lock();
180 cp = LIST_FIRST(&gp->consumer);
181 if (cp->acw == 0) {
182 error = g_access(cp, 0, 1, 0);
183 if (error == 0)
184 opened = 1;
185 }
186 if (!error)
187 error = g_pc98_modify(gp, ms, data, 8192);
188 if (!error)
189 error = g_write_data(cp, 0, data, 8192);
190 if (opened)
191 g_access(cp, 0, -1 , 0);
192 g_topology_unlock();
193 PICKUP_GIANT();
194 return(error);
195 }
196 default:
197 return (ENOIOCTL);
198 }
199 }
200
201 static int
202 g_pc98_start(struct bio *bp)
203 {
204 struct g_provider *pp;
205 struct g_geom *gp;
206 struct g_pc98_softc *mp;
207 struct g_slicer *gsp;
208 int idx;
209
210 pp = bp->bio_to;
211 idx = pp->index;
212 gp = pp->geom;
213 gsp = gp->softc;
214 mp = gsp->softc;
215 if (bp->bio_cmd == BIO_GETATTR) {
216 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
217 return (1);
218 if (g_handleattr_off_t(bp, "PC98::offset",
219 gsp->slices[idx].offset))
220 return (1);
221 }
222
223 return (0);
224 }
225
226 static void
227 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
228 struct g_consumer *cp __unused, struct g_provider *pp)
229 {
230 struct g_pc98_softc *mp;
231 struct g_slicer *gsp;
232 struct pc98_partition dp;
233 char sname[17];
234
235 gsp = gp->softc;
236 mp = gsp->softc;
237 g_slice_dumpconf(sb, indent, gp, cp, pp);
238 if (pp != NULL) {
239 pc98_partition_dec(
240 mp->sec + 512 +
241 pp->index * sizeof(struct pc98_partition), &dp);
242 strncpy(sname, dp.dp_name, 16);
243 sname[16] = '\0';
244 if (indent == NULL) {
245 sbuf_printf(sb, " ty %d", mp->type[pp->index]);
246 sbuf_printf(sb, " sn %s", sname);
247 } else {
248 sbuf_printf(sb, "%s<type>%d</type>\n", indent,
249 mp->type[pp->index]);
250 sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
251 sname);
252 }
253 }
254 }
255
256 static struct g_geom *
257 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
258 {
259 struct g_geom *gp;
260 struct g_consumer *cp;
261 int error;
262 struct g_pc98_softc *ms;
263 u_int fwsectors, fwheads, sectorsize;
264 u_char *buf;
265
266 g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
267 g_topology_assert();
268 if (flags == G_TF_NORMAL &&
269 !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
270 return (NULL);
271 gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
272 if (gp == NULL)
273 return (NULL);
274 g_topology_unlock();
275 do {
276 if (gp->rank != 2 && flags == G_TF_NORMAL)
277 break;
278 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
279 if (error || fwsectors == 0) {
280 fwsectors = 17;
281 if (bootverbose)
282 printf("g_pc98_taste: guessing %d sectors\n",
283 fwsectors);
284 }
285 error = g_getattr("GEOM::fwheads", cp, &fwheads);
286 if (error || fwheads == 0) {
287 fwheads = 8;
288 if (bootverbose)
289 printf("g_pc98_taste: guessing %d heads\n",
290 fwheads);
291 }
292 sectorsize = cp->provider->sectorsize;
293 if (sectorsize % 512 != 0)
294 break;
295 buf = g_read_data(cp, 0, 8192, NULL);
296 if (buf == NULL)
297 break;
298 ms->fwsectors = fwsectors;
299 ms->fwheads = fwheads;
300 ms->sectorsize = sectorsize;
301 g_topology_lock();
302 g_pc98_modify(gp, ms, buf, 8192);
303 g_topology_unlock();
304 g_free(buf);
305 break;
306 } while (0);
307 g_topology_lock();
308 g_access(cp, -1, 0, 0);
309 if (LIST_EMPTY(&gp->provider)) {
310 g_slice_spoiled(cp);
311 return (NULL);
312 }
313 return (gp);
314 }
315
316 static void
317 g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb)
318 {
319 struct g_geom *gp;
320 struct g_consumer *cp;
321 struct g_pc98_softc *ms;
322 struct g_slicer *gsp;
323 int opened = 0, error = 0;
324 void *data;
325 int len;
326
327 g_topology_assert();
328 gp = gctl_get_geom(req, mp, "geom");
329 if (gp == NULL)
330 return;
331 if (strcmp(verb, "write PC98")) {
332 gctl_error(req, "Unknown verb");
333 return;
334 }
335 gsp = gp->softc;
336 ms = gsp->softc;
337 data = gctl_get_param(req, "data", &len);
338 if (data == NULL)
339 return;
340 if (len < 8192 || (len % 512)) {
341 gctl_error(req, "Wrong request length");
342 return;
343 }
344 cp = LIST_FIRST(&gp->consumer);
345 if (cp->acw == 0) {
346 error = g_access(cp, 0, 1, 0);
347 if (error == 0)
348 opened = 1;
349 }
350 if (!error)
351 error = g_pc98_modify(gp, ms, data, len);
352 if (error)
353 gctl_error(req, "conflict with open slices");
354 if (!error)
355 error = g_write_data(cp, 0, data, len);
356 if (error)
357 gctl_error(req, "sector zero write failed");
358 if (opened)
359 g_access(cp, 0, -1 , 0);
360 return;
361 }
362
363 static struct g_class g_pc98_class = {
364 .name = PC98_CLASS_NAME,
365 .version = G_VERSION,
366 .taste = g_pc98_taste,
367 .dumpconf = g_pc98_dumpconf,
368 .ctlreq = g_pc98_config,
369 .ioctl = g_pc98_ioctl,
370 };
371
372 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);
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