geom_pc98.c revision 138219
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: head/sys/geom/geom_pc98.c 138219 2004-11-30 08:00:14Z imp $"); 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 51struct g_pc98_softc { 52 u_int fwsectors, fwheads, sectorsize; 53 int type[NDOSPART]; 54 u_char sec[8192]; 55}; 56 57static void 58g_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 73static int 74g_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 * FreeBSD's boot0 IPL uses the name IPL1. This test initially was 88 * based on that observation. However, other boot loaders have use 89 * different names. A likely good test would be to test if the first 90 * 4 bytes are a jump to location 11 (or greater?) as well as the next 91 * 7 bytes being printable or with trailing NUL's. 92 */ 93 if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1') 94 return (EBUSY); 95#endif 96 97 for (i = 0; i < NDOSPART; i++) 98 pc98_partition_dec( 99 sec + 512 + i * sizeof(struct pc98_partition), &dp[i]); 100 101 for (i = 0; i < NDOSPART; i++) { 102 /* If start and end are identical it's bogus */ 103 if (dp[i].dp_ssect == dp[i].dp_esect && 104 dp[i].dp_shd == dp[i].dp_ehd && 105 dp[i].dp_scyl == dp[i].dp_ecyl) 106 s[i] = l[i] = 0; 107 else if (dp[i].dp_ecyl == 0) 108 s[i] = l[i] = 0; 109 else { 110 s[i] = (off_t)dp[i].dp_scyl * 111 ms->fwsectors * ms->fwheads * ms->sectorsize; 112 l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) * 113 ms->fwsectors * ms->fwheads * ms->sectorsize; 114 } 115 if (bootverbose) { 116 printf("PC98 Slice %d on %s:\n", i + 1, gp->name); 117 g_pc98_print(i, dp + i); 118 } 119 if (s[i] < 0 || l[i] < 0) 120 error = EBUSY; 121 else 122 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK, 123 s[i], l[i], ms->sectorsize, 124 "%ss%d", gp->name, i + 1); 125 if (error) 126 return (error); 127 } 128 129 for (i = 0; i < NDOSPART; i++) { 130 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid; 131 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i], 132 ms->sectorsize, "%ss%d", gp->name, i + 1); 133 } 134 135 bcopy(sec, ms->sec, sizeof (ms->sec)); 136 137 return (0); 138} 139 140static int 141g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, struct thread *td) 142{ 143 struct g_geom *gp; 144 struct g_pc98_softc *ms; 145 struct g_slicer *gsp; 146 struct g_consumer *cp; 147 int error; 148 149 gp = pp->geom; 150 gsp = gp->softc; 151 ms = gsp->softc; 152 153 switch(cmd) { 154 case DIOCSPC98: { 155 DROP_GIANT(); 156 g_topology_lock(); 157 /* Validate and modify our slicer instance to match. */ 158 error = g_pc98_modify(gp, ms, data); 159 cp = LIST_FIRST(&gp->consumer); 160 error = g_write_data(cp, 0, data, 8192); 161 g_topology_unlock(); 162 PICKUP_GIANT(); 163 return(error); 164 } 165 default: 166 return (ENOIOCTL); 167 } 168} 169 170static int 171g_pc98_start(struct bio *bp) 172{ 173 struct g_provider *pp; 174 struct g_geom *gp; 175 struct g_pc98_softc *mp; 176 struct g_slicer *gsp; 177 int idx; 178 179 pp = bp->bio_to; 180 idx = pp->index; 181 gp = pp->geom; 182 gsp = gp->softc; 183 mp = gsp->softc; 184 if (bp->bio_cmd == BIO_GETATTR) { 185 if (g_handleattr_int(bp, "PC98::type", mp->type[idx])) 186 return (1); 187 if (g_handleattr_off_t(bp, "PC98::offset", 188 gsp->slices[idx].offset)) 189 return (1); 190 } 191 192 return (0); 193} 194 195static void 196g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 197 struct g_consumer *cp __unused, struct g_provider *pp) 198{ 199 struct g_pc98_softc *mp; 200 struct g_slicer *gsp; 201 struct pc98_partition dp; 202 char sname[17]; 203 204 gsp = gp->softc; 205 mp = gsp->softc; 206 g_slice_dumpconf(sb, indent, gp, cp, pp); 207 if (pp != NULL) { 208 pc98_partition_dec( 209 mp->sec + 512 + 210 pp->index * sizeof(struct pc98_partition), &dp); 211 strncpy(sname, dp.dp_name, 16); 212 sname[16] = '\0'; 213 if (indent == NULL) { 214 sbuf_printf(sb, " ty %d", mp->type[pp->index]); 215 sbuf_printf(sb, " sn %s", sname); 216 } else { 217 sbuf_printf(sb, "%s<type>%d</type>\n", indent, 218 mp->type[pp->index]); 219 sbuf_printf(sb, "%s<sname>%s</sname>\n", indent, 220 sname); 221 } 222 } 223} 224 225static struct g_geom * 226g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags) 227{ 228 struct g_geom *gp; 229 struct g_consumer *cp; 230 int error; 231 struct g_pc98_softc *ms; 232 u_int fwsectors, fwheads, sectorsize; 233 u_char *buf; 234 235 g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name); 236 g_topology_assert(); 237 if (flags == G_TF_NORMAL && 238 !strcmp(pp->geom->class->name, PC98_CLASS_NAME)) 239 return (NULL); 240 gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start); 241 if (gp == NULL) 242 return (NULL); 243 g_topology_unlock(); 244 do { 245 if (gp->rank != 2 && flags == G_TF_NORMAL) 246 break; 247 error = g_getattr("GEOM::fwsectors", cp, &fwsectors); 248 if (error || fwsectors == 0) { 249 fwsectors = 17; 250 if (bootverbose) 251 printf("g_pc98_taste: guessing %d sectors\n", 252 fwsectors); 253 } 254 error = g_getattr("GEOM::fwheads", cp, &fwheads); 255 if (error || fwheads == 0) { 256 fwheads = 8; 257 if (bootverbose) 258 printf("g_pc98_taste: guessing %d heads\n", 259 fwheads); 260 } 261 sectorsize = cp->provider->sectorsize; 262 if (sectorsize % 512 != 0) 263 break; 264 if (!strncmp(gp->name, "ad", 2)) { 265 u_int total_secs = cp->provider->mediasize/sectorsize; 266 267 if (total_secs < 17*8*65535) { 268 fwsectors = 17; 269 fwheads = 8; 270 } 271 else if (total_secs < 63*16*65535) { 272 if (fwsectors > 63) 273 fwsectors = 63; 274 if (fwheads > 16) 275 fwheads = 16; 276 } 277 else if (total_secs < 255*16*65535) { 278 fwsectors = 255; 279 if (fwheads > 16) 280 fwheads = 16; 281 } 282 else { 283 fwsectors = 255; 284 fwheads = 255; 285 } 286 } 287 buf = g_read_data(cp, 0, 8192, &error); 288 if (buf == NULL || error != 0) 289 break; 290 ms->fwsectors = fwsectors; 291 ms->fwheads = fwheads; 292 ms->sectorsize = sectorsize; 293 g_topology_lock(); 294 g_pc98_modify(gp, ms, buf); 295 g_topology_unlock(); 296 g_free(buf); 297 break; 298 } while (0); 299 g_topology_lock(); 300 g_access(cp, -1, 0, 0); 301 if (LIST_EMPTY(&gp->provider)) { 302 g_slice_spoiled(cp); 303 return (NULL); 304 } 305 return (gp); 306} 307 308static struct g_class g_pc98_class = { 309 .name = PC98_CLASS_NAME, 310 .version = G_VERSION, 311 .taste = g_pc98_taste, 312 .dumpconf = g_pc98_dumpconf, 313 .ioctl = g_pc98_ioctl, 314}; 315 316DECLARE_GEOM_CLASS(g_pc98_class, g_pc98); 317