Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_pc98.c
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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/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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