geom_pc98.c revision 113432
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 113432 2003-04-13 09:02:06Z phk $ 33 */ 34 35#include <sys/param.h> 36#include <sys/endian.h> 37#include <sys/systm.h> 38#include <sys/kernel.h> 39#include <sys/malloc.h> 40#include <sys/bio.h> 41#include <sys/lock.h> 42#include <sys/mutex.h> 43 44#include <sys/diskpc98.h> 45#include <geom/geom.h> 46#include <geom/geom_slice.h> 47 48#define PC98_CLASS_NAME "PC98" 49 50static void 51g_dec_pc98_partition(u_char *ptr, struct pc98_partition *d) 52{ 53 u_int u; 54 55 d->dp_mid = ptr[0]; 56 d->dp_sid = ptr[1]; 57 d->dp_dum1 = ptr[2]; 58 d->dp_dum2 = ptr[3]; 59 d->dp_ipl_sct = ptr[4]; 60 d->dp_ipl_head = ptr[5]; 61 d->dp_ipl_cyl = le16dec(ptr + 6); 62 d->dp_ssect = ptr[8]; 63 d->dp_shd = ptr[9]; 64 d->dp_scyl = le16dec(ptr + 10); 65 d->dp_esect = ptr[12]; 66 d->dp_ehd = ptr[13]; 67 d->dp_ecyl = le16dec(ptr + 14); 68 for (u = 0; u < sizeof(d->dp_name); u++) 69 d->dp_name[u] = ptr[16 + u]; 70} 71 72struct g_pc98_softc { 73 u_int fwsectors, fwheads, sectorsize; 74 int type[NDOSPART]; 75 u_char sec[8192]; 76}; 77 78static void 79g_pc98_print(int i, struct pc98_partition *dp) 80{ 81 char sname[17]; 82 83 strncpy(sname, dp->dp_name, 16); 84 sname[16] = '\0'; 85 86 g_hexdump(dp, sizeof(dp[0])); 87 printf("[%d] mid:%d(0x%x) sid:%d(0x%x)", 88 i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid); 89 printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect); 90 printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect); 91 printf(" sname:%s\n", sname); 92} 93 94static int 95g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec) 96{ 97 int i, error; 98 off_t s[NDOSPART], l[NDOSPART]; 99 struct pc98_partition dp[NDOSPART]; 100 101 g_topology_assert(); 102 103 if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa) 104 return (EBUSY); 105 106#if 0 107 /* 108 * XXX: Some sources indicate this is a magic sequence, but appearantly 109 * XXX: it is not universal. Documentation would be wonderful to have. 110 */ 111 if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1') 112 return (EBUSY); 113#endif 114 115 for (i = 0; i < NDOSPART; i++) 116 g_dec_pc98_partition( 117 sec + 512 + i * sizeof(struct pc98_partition), &dp[i]); 118 119 for (i = 0; i < NDOSPART; i++) { 120 /* If start and end are identical it's bogus */ 121 if (dp[i].dp_ssect == dp[i].dp_esect && 122 dp[i].dp_shd == dp[i].dp_ehd && 123 dp[i].dp_scyl == dp[i].dp_ecyl) 124 s[i] = l[i] = 0; 125 else if (dp[i].dp_ecyl == 0) 126 s[i] = l[i] = 0; 127 else { 128 s[i] = (off_t)dp[i].dp_scyl * 129 ms->fwsectors * ms->fwheads * ms->sectorsize; 130 l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) * 131 ms->fwsectors * ms->fwheads * ms->sectorsize; 132 } 133 if (bootverbose) { 134 printf("PC98 Slice %d on %s:\n", i + 1, gp->name); 135 g_pc98_print(i, dp + i); 136 } 137 if (s[i] < 0 || l[i] < 0) 138 error = EBUSY; 139 else 140 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK, 141 s[i], l[i], ms->sectorsize, 142 "%ss%d", gp->name, i + 1); 143 if (error) 144 return (error); 145 } 146 147 for (i = 0; i < NDOSPART; i++) { 148 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid; 149 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i], 150 ms->sectorsize, "%ss%d", gp->name, i + 1); 151 } 152 153 bcopy(sec, ms->sec, sizeof (ms->sec)); 154 155 return (0); 156} 157 158static void 159g_pc98_ioctl(void *arg, int flag) 160{ 161 struct bio *bp; 162 struct g_geom *gp; 163 struct g_slicer *gsp; 164 struct g_pc98_softc *ms; 165 struct g_ioctl *gio; 166 struct g_consumer *cp; 167 u_char *sec; 168 int error; 169 170 bp = arg; 171 if (flag == EV_CANCEL) { 172 g_io_deliver(bp, ENXIO); 173 return; 174 } 175 gp = bp->bio_to->geom; 176 gsp = gp->softc; 177 ms = gsp->softc; 178 gio = (struct g_ioctl *)bp->bio_data; 179 180 /* The disklabel to set is the ioctl argument. */ 181 sec = gio->data; 182 183 error = g_pc98_modify(gp, ms, sec); 184 if (error) { 185 g_io_deliver(bp, error); 186 return; 187 } 188 cp = LIST_FIRST(&gp->consumer); 189 error = g_write_data(cp, 0, sec, 8192); 190 g_io_deliver(bp, error); 191} 192 193static int 194g_pc98_start(struct bio *bp) 195{ 196 struct g_provider *pp; 197 struct g_geom *gp; 198 struct g_pc98_softc *mp; 199 struct g_slicer *gsp; 200 struct g_ioctl *gio; 201 int idx, error; 202 203 pp = bp->bio_to; 204 idx = pp->index; 205 gp = pp->geom; 206 gsp = gp->softc; 207 mp = gsp->softc; 208 if (bp->bio_cmd == BIO_GETATTR) { 209 if (g_handleattr_int(bp, "PC98::type", mp->type[idx])) 210 return (1); 211 if (g_handleattr_off_t(bp, "PC98::offset", 212 gsp->slices[idx].offset)) 213 return (1); 214 } 215 216 /* We only handle ioctl(2) requests of the right format. */ 217 if (strcmp(bp->bio_attribute, "GEOM::ioctl")) 218 return (0); 219 else if (bp->bio_length != sizeof(*gio)) 220 return (0); 221 /* Get hold of the ioctl parameters. */ 222 gio = (struct g_ioctl *)bp->bio_data; 223 224 switch (gio->cmd) { 225 case DIOCGPC98: 226 /* Return a copy of the disklabel to userland. */ 227 bcopy(mp->sec, gio->data, 8192); 228 g_io_deliver(bp, 0); 229 return (1); 230 case DIOCSPC98: 231 /* 232 * These we cannot do without the topology lock and some 233 * some I/O requests. Ask the event-handler to schedule 234 * us in a less restricted environment. 235 */ 236 error = g_call_me(g_pc98_ioctl, bp, gp, NULL); 237 if (error) 238 g_io_deliver(bp, error); 239 /* 240 * We must return non-zero to indicate that we will deal 241 * with this bio, even though we have not done so yet. 242 */ 243 return (1); 244 default: 245 return (0); 246 } 247 248 return (0); 249} 250 251static void 252g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 253 struct g_consumer *cp __unused, struct g_provider *pp) 254{ 255 struct g_pc98_softc *mp; 256 struct g_slicer *gsp; 257 struct pc98_partition dp; 258 char sname[17]; 259 260 gsp = gp->softc; 261 mp = gsp->softc; 262 g_slice_dumpconf(sb, indent, gp, cp, pp); 263 if (pp != NULL) { 264 g_dec_pc98_partition( 265 mp->sec + 512 + 266 pp->index * sizeof(struct pc98_partition), &dp); 267 strncpy(sname, dp.dp_name, 16); 268 sname[16] = '\0'; 269 if (indent == NULL) { 270 sbuf_printf(sb, " ty %d", mp->type[pp->index]); 271 sbuf_printf(sb, " sn %s", sname); 272 } else { 273 sbuf_printf(sb, "%s<type>%d</type>\n", indent, 274 mp->type[pp->index]); 275 sbuf_printf(sb, "%s<sname>%s</sname>\n", indent, 276 sname); 277 } 278 } 279} 280 281static struct g_geom * 282g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags) 283{ 284 struct g_geom *gp; 285 struct g_consumer *cp; 286 int error; 287 struct g_pc98_softc *ms; 288 struct g_slicer *gsp; 289 u_int fwsectors, fwheads, sectorsize; 290 u_char *buf; 291 292 g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name); 293 g_topology_assert(); 294 if (flags == G_TF_NORMAL && 295 !strcmp(pp->geom->class->name, PC98_CLASS_NAME)) 296 return (NULL); 297 gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start); 298 if (gp == NULL) 299 return (NULL); 300 gsp = gp->softc; 301 g_topology_unlock(); 302 gp->dumpconf = g_pc98_dumpconf; 303 do { 304 if (gp->rank != 2 && flags == G_TF_NORMAL) 305 break; 306 error = g_getattr("GEOM::fwsectors", cp, &fwsectors); 307 if (error || fwsectors == 0) { 308 fwsectors = 17; 309 if (bootverbose) 310 printf("g_pc98_taste: guessing %d sectors\n", 311 fwsectors); 312 } 313 error = g_getattr("GEOM::fwheads", cp, &fwheads); 314 if (error || fwheads == 0) { 315 fwheads = 8; 316 if (bootverbose) 317 printf("g_pc98_taste: guessing %d heads\n", 318 fwheads); 319 } 320 sectorsize = cp->provider->sectorsize; 321 if (sectorsize < 512) 322 break; 323 buf = g_read_data(cp, 0, 8192, &error); 324 if (buf == NULL || error != 0) 325 break; 326 ms->fwsectors = fwsectors; 327 ms->fwheads = fwheads; 328 ms->sectorsize = sectorsize; 329 g_topology_lock(); 330 g_pc98_modify(gp, ms, buf); 331 g_topology_unlock(); 332 g_free(buf); 333 break; 334 } while (0); 335 g_topology_lock(); 336 g_access_rel(cp, -1, 0, 0); 337 if (LIST_EMPTY(&gp->provider)) { 338 g_std_spoiled(cp); 339 return (NULL); 340 } 341 return (gp); 342} 343 344static struct g_class g_pc98_class = { 345 .name = PC98_CLASS_NAME, 346 .taste = g_pc98_taste, 347 G_CLASS_INITIALIZER 348}; 349 350DECLARE_GEOM_CLASS(g_pc98_class, g_pc98); 351