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: stable/10/sys/geom/geom_pc98.c 254015 2013-08-07 00:00:48Z marcel $");
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/proc.h>
47 #include <sys/sbuf.h>
48
49 #include <sys/diskpc98.h>
50 #include <geom/geom.h>
51 #include <geom/geom_slice.h>
52
53 FEATURE(geom_pc98, "GEOM NEC PC9800 partitioning support");
54
55 #define PC98_CLASS_NAME "PC98"
56
57 struct g_pc98_softc {
58 u_int fwsectors, fwheads, sectorsize;
59 int type[PC98_NPARTS];
60 u_char sec[8192];
61 };
62
63 static void
g_pc98_print(int i,struct pc98_partition * dp)64 g_pc98_print(int i, struct pc98_partition *dp)
65 {
66 char sname[17];
67
68 strncpy(sname, dp->dp_name, 16);
69 sname[16] = '\0';
70
71 hexdump(dp, sizeof(dp[0]), NULL, 0);
72 printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
73 i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
74 printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
75 printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
76 printf(" sname:%s\n", sname);
77 }
78
79 /*
80 * XXX: Add gctl_req arg and give good error msgs.
81 * XXX: Check that length argument does not bring boot code inside any slice.
82 */
83 static int
g_pc98_modify(struct g_geom * gp,struct g_pc98_softc * ms,u_char * sec,int len __unused)84 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused)
85 {
86 int i, error;
87 off_t s[PC98_NPARTS], l[PC98_NPARTS];
88 struct pc98_partition dp[PC98_NPARTS];
89
90 g_topology_assert();
91
92 if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
93 return (EBUSY);
94
95 #if 0
96 /*
97 * By convetion, it seems that the ipl program has a jump at location
98 * 0 to the real start of the boot loader. By convetion, it appears
99 * that after this jump, there's a string, terminated by at last one,
100 * if not more, zeros, followed by the target of the jump. FreeBSD's
101 * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
102 * compatibility with some older boot loader. Linux98's boot loader
103 * appears to use 'Linux 98' followed by only two. GRUB/98 appears to
104 * use 'GRUB/98 ' followed by none. These last two appear to be
105 * ported from the ia32 versions, but appear to show similar
106 * convention. Grub/98 has an additional NOP after the jmp, which
107 * isn't present in others.
108 *
109 * The following test was inspired by looking only at partitions
110 * with FreeBSD's boot0 (or one that it is compatible with). As
111 * such, if failed when other IPL programs were used.
112 */
113 if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
114 return (EBUSY);
115 #endif
116
117 for (i = 0; i < PC98_NPARTS; i++)
118 pc98_partition_dec(
119 sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
120
121 for (i = 0; i < PC98_NPARTS; i++) {
122 /* If start and end are identical it's bogus */
123 if (dp[i].dp_ssect == dp[i].dp_esect &&
124 dp[i].dp_shd == dp[i].dp_ehd &&
125 dp[i].dp_scyl == dp[i].dp_ecyl)
126 s[i] = l[i] = 0;
127 else if (dp[i].dp_ecyl == 0)
128 s[i] = l[i] = 0;
129 else {
130 s[i] = (off_t)dp[i].dp_scyl *
131 ms->fwsectors * ms->fwheads * ms->sectorsize;
132 l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
133 ms->fwsectors * ms->fwheads * ms->sectorsize;
134 }
135 if (bootverbose) {
136 printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
137 g_pc98_print(i, dp + i);
138 }
139 if (s[i] < 0 || l[i] < 0)
140 error = EBUSY;
141 else
142 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
143 s[i], l[i], ms->sectorsize,
144 "%ss%d", gp->name, i + 1);
145 if (error)
146 return (error);
147 }
148
149 for (i = 0; i < PC98_NPARTS; i++) {
150 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
151 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
152 ms->sectorsize, "%ss%d", gp->name, i + 1);
153 }
154
155 bcopy(sec, ms->sec, sizeof (ms->sec));
156
157 return (0);
158 }
159
160 static int
g_pc98_ioctl(struct g_provider * pp,u_long cmd,void * data,int fflag,struct thread * td)161 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
162 {
163 struct g_geom *gp;
164 struct g_pc98_softc *ms;
165 struct g_slicer *gsp;
166 struct g_consumer *cp;
167 int error, opened;
168
169 gp = pp->geom;
170 gsp = gp->softc;
171 ms = gsp->softc;
172
173 opened = 0;
174 error = 0;
175 switch(cmd) {
176 case DIOCSPC98: {
177 if (!(fflag & FWRITE))
178 return (EPERM);
179 DROP_GIANT();
180 g_topology_lock();
181 cp = LIST_FIRST(&gp->consumer);
182 if (cp->acw == 0) {
183 error = g_access(cp, 0, 1, 0);
184 if (error == 0)
185 opened = 1;
186 }
187 if (!error)
188 error = g_pc98_modify(gp, ms, data, 8192);
189 if (!error)
190 error = g_write_data(cp, 0, data, 8192);
191 if (opened)
192 g_access(cp, 0, -1 , 0);
193 g_topology_unlock();
194 PICKUP_GIANT();
195 return(error);
196 }
197 default:
198 return (ENOIOCTL);
199 }
200 }
201
202 static int
g_pc98_start(struct bio * bp)203 g_pc98_start(struct bio *bp)
204 {
205 struct g_provider *pp;
206 struct g_geom *gp;
207 struct g_pc98_softc *mp;
208 struct g_slicer *gsp;
209 int idx;
210
211 pp = bp->bio_to;
212 idx = pp->index;
213 gp = pp->geom;
214 gsp = gp->softc;
215 mp = gsp->softc;
216 if (bp->bio_cmd == BIO_GETATTR) {
217 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
218 return (1);
219 if (g_handleattr_off_t(bp, "PC98::offset",
220 gsp->slices[idx].offset))
221 return (1);
222 }
223
224 return (0);
225 }
226
227 static void
g_pc98_dumpconf(struct sbuf * sb,const char * indent,struct g_geom * gp,struct g_consumer * cp __unused,struct g_provider * pp)228 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
229 struct g_consumer *cp __unused, struct g_provider *pp)
230 {
231 struct g_pc98_softc *mp;
232 struct g_slicer *gsp;
233 struct pc98_partition dp;
234 char sname[17];
235
236 gsp = gp->softc;
237 mp = gsp->softc;
238 g_slice_dumpconf(sb, indent, gp, cp, pp);
239 if (pp != NULL) {
240 pc98_partition_dec(
241 mp->sec + 512 +
242 pp->index * sizeof(struct pc98_partition), &dp);
243 strncpy(sname, dp.dp_name, 16);
244 sname[16] = '\0';
245 if (indent == NULL) {
246 sbuf_printf(sb, " ty %d", mp->type[pp->index]);
247 sbuf_printf(sb, " sn %s", sname);
248 } else {
249 sbuf_printf(sb, "%s<type>%d</type>\n", indent,
250 mp->type[pp->index]);
251 sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
252 sname);
253 }
254 }
255 }
256
257 static struct g_geom *
g_pc98_taste(struct g_class * mp,struct g_provider * pp,int flags)258 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
259 {
260 struct g_geom *gp;
261 struct g_consumer *cp;
262 int error;
263 struct g_pc98_softc *ms;
264 u_int fwsectors, fwheads, sectorsize;
265 u_char *buf;
266
267 g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
268 g_topology_assert();
269 if (flags == G_TF_NORMAL &&
270 !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
271 return (NULL);
272 gp = g_slice_new(mp, PC98_NPARTS, pp, &cp, &ms, sizeof *ms,
273 g_pc98_start);
274 if (gp == NULL)
275 return (NULL);
276 g_topology_unlock();
277 do {
278 if (gp->rank != 2 && flags == G_TF_NORMAL)
279 break;
280 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
281 if (error || fwsectors == 0) {
282 fwsectors = 17;
283 if (bootverbose)
284 printf("g_pc98_taste: guessing %d sectors\n",
285 fwsectors);
286 }
287 error = g_getattr("GEOM::fwheads", cp, &fwheads);
288 if (error || fwheads == 0) {
289 fwheads = 8;
290 if (bootverbose)
291 printf("g_pc98_taste: guessing %d heads\n",
292 fwheads);
293 }
294 sectorsize = cp->provider->sectorsize;
295 if (sectorsize % 512 != 0)
296 break;
297 buf = g_read_data(cp, 0, 8192, NULL);
298 if (buf == NULL)
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, 8192);
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
318 static void
g_pc98_config(struct gctl_req * req,struct g_class * mp,const char * verb)319 g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb)
320 {
321 struct g_geom *gp;
322 struct g_consumer *cp;
323 struct g_pc98_softc *ms;
324 struct g_slicer *gsp;
325 int opened = 0, error = 0;
326 void *data;
327 int len;
328
329 g_topology_assert();
330 gp = gctl_get_geom(req, mp, "geom");
331 if (gp == NULL)
332 return;
333 if (strcmp(verb, "write PC98")) {
334 gctl_error(req, "Unknown verb");
335 return;
336 }
337 gsp = gp->softc;
338 ms = gsp->softc;
339 data = gctl_get_param(req, "data", &len);
340 if (data == NULL)
341 return;
342 if (len < 8192 || (len % 512)) {
343 gctl_error(req, "Wrong request length");
344 return;
345 }
346 cp = LIST_FIRST(&gp->consumer);
347 if (cp->acw == 0) {
348 error = g_access(cp, 0, 1, 0);
349 if (error == 0)
350 opened = 1;
351 }
352 if (!error)
353 error = g_pc98_modify(gp, ms, data, len);
354 if (error)
355 gctl_error(req, "conflict with open slices");
356 if (!error)
357 error = g_write_data(cp, 0, data, len);
358 if (error)
359 gctl_error(req, "sector zero write failed");
360 if (opened)
361 g_access(cp, 0, -1 , 0);
362 return;
363 }
364
365 static struct g_class g_pc98_class = {
366 .name = PC98_CLASS_NAME,
367 .version = G_VERSION,
368 .taste = g_pc98_taste,
369 .dumpconf = g_pc98_dumpconf,
370 .ctlreq = g_pc98_config,
371 .ioctl = g_pc98_ioctl,
372 };
373
374 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);
375