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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("$FreeBSD$");
35
36 #include <sys/param.h>
37 #include <sys/endian.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/malloc.h>
41 #include <sys/bio.h>
42 #include <sys/lock.h>
43 #include <sys/mutex.h>
44
45 #include <sys/diskpc98.h>
46 #include <geom/geom.h>
47 #include <geom/geom_slice.h>
48
49 #define PC98_CLASS_NAME "PC98"
50
51 struct g_pc98_softc {
52         u_int fwsectors, fwheads, sectorsize;
53         int type[NDOSPART];
54         u_char sec[8192];
55 };
56
57 static void
58 g_pc98_print(int i, struct pc98_partition *dp)
59 {
60         char sname[17];
61
62         strncpy(sname, dp->dp_name, 16);
63         sname[16] = '\0';
64
65         hexdump(dp, sizeof(dp[0]), NULL, 0);
66         printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
67                i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
68         printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
69         printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
70         printf(" sname:%s\n", sname);
71 }
72
73 static int
74 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec)
75 {
76         int i, error;
77         off_t s[NDOSPART], l[NDOSPART];
78         struct pc98_partition dp[NDOSPART];
79
80         g_topology_assert();
81         
82         if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
83                 return (EBUSY);
84
85 #if 0
86         /*
87          * XXX: Some sources indicate this is a magic sequence, but appearantly
88          * XXX: it is not universal. Documentation would be wonderful to have.
89          */
90         if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
91                 return (EBUSY);
92 #endif
93
94         for (i = 0; i < NDOSPART; i++)
95                 pc98_partition_dec(
96                         sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
97
98         for (i = 0; i < NDOSPART; i++) {
99                 /* If start and end are identical it's bogus */
100                 if (dp[i].dp_ssect == dp[i].dp_esect &&
101                     dp[i].dp_shd == dp[i].dp_ehd &&
102                     dp[i].dp_scyl == dp[i].dp_ecyl)
103                         s[i] = l[i] = 0;
104                 else if (dp[i].dp_ecyl == 0)
105                         s[i] = l[i] = 0;
106                 else {
107                         s[i] = (off_t)dp[i].dp_scyl *
108                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
109                         l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
110                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
111                 }
112                 if (bootverbose) {
113                         printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
114                         g_pc98_print(i, dp + i);
115                 }
116                 if (s[i] < 0 || l[i] < 0)
117                         error = EBUSY;
118                 else
119                         error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
120                                        s[i], l[i], ms->sectorsize,
121                                        "%ss%d", gp->name, i + 1);
122                 if (error)
123                         return (error);
124         }
125
126         for (i = 0; i < NDOSPART; i++) {
127                 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
128                 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
129                                ms->sectorsize, "%ss%d", gp->name, i + 1);
130         }
131
132         bcopy(sec, ms->sec, sizeof (ms->sec));
133
134         return (0);
135 }
136
137 static int
138 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, struct thread *td)
139 {
140         struct g_geom *gp;
141         struct g_pc98_softc *ms;
142         struct g_slicer *gsp;
143         struct g_consumer *cp;
144         int error;
145
146         gp = pp->geom;
147         gsp = gp->softc;
148         ms = gsp->softc;
149
150         switch(cmd) {
151         case DIOCSPC98: {
152                 DROP_GIANT();
153                 g_topology_lock();
154                 /* Validate and modify our slicer instance to match. */
155                 error = g_pc98_modify(gp, ms, data);
156                 cp = LIST_FIRST(&gp->consumer);
157                 error = g_write_data(cp, 0, data, 8192);
158                 g_topology_unlock();
159                 PICKUP_GIANT();
160                 return(error);
161         }
162         default:
163                 return (ENOIOCTL);
164         }
165 }
166
167 static int
168 g_pc98_start(struct bio *bp)
169 {
170         struct g_provider *pp;
171         struct g_geom *gp;
172         struct g_pc98_softc *mp;
173         struct g_slicer *gsp;
174         int idx;
175
176         pp = bp->bio_to;
177         idx = pp->index;
178         gp = pp->geom;
179         gsp = gp->softc;
180         mp = gsp->softc;
181         if (bp->bio_cmd == BIO_GETATTR) {
182                 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
183                         return (1);
184                 if (g_handleattr_off_t(bp, "PC98::offset",
185                                        gsp->slices[idx].offset))
186                         return (1);
187         }
188
189         return (0);
190 }
191
192 static void
193 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
194                 struct g_consumer *cp __unused, struct g_provider *pp)
195 {
196         struct g_pc98_softc *mp;
197         struct g_slicer *gsp;
198         struct pc98_partition dp;
199         char sname[17];
200
201         gsp = gp->softc;
202         mp = gsp->softc;
203         g_slice_dumpconf(sb, indent, gp, cp, pp);
204         if (pp != NULL) {
205                 pc98_partition_dec(
206                         mp->sec + 512 +
207                         pp->index * sizeof(struct pc98_partition), &dp);
208                 strncpy(sname, dp.dp_name, 16);
209                 sname[16] = '\0';
210                 if (indent == NULL) {
211                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
212                         sbuf_printf(sb, " sn %s", sname);
213                 } else {
214                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
215                                     mp->type[pp->index]);
216                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
217                                     sname);
218                 }
219         }
220 }
221
222 static struct g_geom *
223 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
224 {
225         struct g_geom *gp;
226         struct g_consumer *cp;
227         int error;
228         struct g_pc98_softc *ms;
229         u_int fwsectors, fwheads, sectorsize;
230         u_char *buf;
231
232         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
233         g_topology_assert();
234         if (flags == G_TF_NORMAL &&
235             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
236                 return (NULL);
237         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
238         if (gp == NULL)
239                 return (NULL);
240         g_topology_unlock();
241         do {
242                 if (gp->rank != 2 && flags == G_TF_NORMAL)
243                         break;
244                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
245                 if (error || fwsectors == 0) {
246                         fwsectors = 17;
247                         if (bootverbose)
248                                 printf("g_pc98_taste: guessing %d sectors\n",
249                                     fwsectors);
250                 }
251                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
252                 if (error || fwheads == 0) {
253                         fwheads = 8;
254                         if (bootverbose)
255                                 printf("g_pc98_taste: guessing %d heads\n",
256                                     fwheads);
257                 }
258                 sectorsize = cp->provider->sectorsize;
259                 if (sectorsize < 512)
260                         break;
261                 buf = g_read_data(cp, 0, 8192, &error);
262                 if (buf == NULL || error != 0)
263                         break;
264                 ms->fwsectors = fwsectors;
265                 ms->fwheads = fwheads;
266                 ms->sectorsize = sectorsize;
267                 g_topology_lock();
268                 g_pc98_modify(gp, ms, buf);
269                 g_topology_unlock();
270                 g_free(buf);
271                 break;
272         } while (0);
273         g_topology_lock();
274         g_access(cp, -1, 0, 0);
275         if (LIST_EMPTY(&gp->provider)) {
276                 g_slice_spoiled(cp);
277                 return (NULL);
278         }
279         return (gp);
280 }
281
282 static struct g_class g_pc98_class = {
283         .name = PC98_CLASS_NAME,
284         .version = G_VERSION,
285         .taste = g_pc98_taste,
286         .dumpconf = g_pc98_dumpconf,
287         .ioctl = g_pc98_ioctl,
288 };
289
290 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);