geom_pc98.c revision 116196
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 116196 2003-06-11 06:49:16Z obrien $"); 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 g_hexdump(dp, sizeof(dp[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 * 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 137static void 138g_pc98_ioctl(void *arg, int flag) 139{ 140 struct bio *bp; 141 struct g_geom *gp; 142 struct g_slicer *gsp; 143 struct g_pc98_softc *ms; 144 struct g_ioctl *gio; 145 struct g_consumer *cp; 146 u_char *sec; 147 int error; 148 149 bp = arg; 150 if (flag == EV_CANCEL) { 151 g_io_deliver(bp, ENXIO); 152 return; 153 } 154 gp = bp->bio_to->geom; 155 gsp = gp->softc; 156 ms = gsp->softc; 157 gio = (struct g_ioctl *)bp->bio_data; 158 159 /* The disklabel to set is the ioctl argument. */ 160 sec = gio->data; 161 162 error = g_pc98_modify(gp, ms, sec); 163 if (error) { 164 g_io_deliver(bp, error); 165 return; 166 } 167 cp = LIST_FIRST(&gp->consumer); 168 error = g_write_data(cp, 0, sec, 8192); 169 g_io_deliver(bp, error); 170} 171 172static int 173g_pc98_start(struct bio *bp) 174{ 175 struct g_provider *pp; 176 struct g_geom *gp; 177 struct g_pc98_softc *mp; 178 struct g_slicer *gsp; 179 struct g_ioctl *gio; 180 int idx, error; 181 182 pp = bp->bio_to; 183 idx = pp->index; 184 gp = pp->geom; 185 gsp = gp->softc; 186 mp = gsp->softc; 187 if (bp->bio_cmd == BIO_GETATTR) { 188 if (g_handleattr_int(bp, "PC98::type", mp->type[idx])) 189 return (1); 190 if (g_handleattr_off_t(bp, "PC98::offset", 191 gsp->slices[idx].offset)) 192 return (1); 193 } 194 195 /* We only handle ioctl(2) requests of the right format. */ 196 if (strcmp(bp->bio_attribute, "GEOM::ioctl")) 197 return (0); 198 else if (bp->bio_length != sizeof(*gio)) 199 return (0); 200 /* Get hold of the ioctl parameters. */ 201 gio = (struct g_ioctl *)bp->bio_data; 202 203 switch (gio->cmd) { 204 case DIOCSPC98: 205 /* 206 * These we cannot do without the topology lock and some 207 * some I/O requests. Ask the event-handler to schedule 208 * us in a less restricted environment. 209 */ 210 error = g_post_event(g_pc98_ioctl, bp, M_NOWAIT, gp, NULL); 211 if (error) 212 g_io_deliver(bp, error); 213 /* 214 * We must return non-zero to indicate that we will deal 215 * with this bio, even though we have not done so yet. 216 */ 217 return (1); 218 default: 219 return (0); 220 } 221} 222 223static void 224g_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 253static struct g_geom * 254g_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 gp->dumpconf = g_pc98_dumpconf; 273 do { 274 if (gp->rank != 2 && flags == G_TF_NORMAL) 275 break; 276 error = g_getattr("GEOM::fwsectors", cp, &fwsectors); 277 if (error || fwsectors == 0) { 278 fwsectors = 17; 279 if (bootverbose) 280 printf("g_pc98_taste: guessing %d sectors\n", 281 fwsectors); 282 } 283 error = g_getattr("GEOM::fwheads", cp, &fwheads); 284 if (error || fwheads == 0) { 285 fwheads = 8; 286 if (bootverbose) 287 printf("g_pc98_taste: guessing %d heads\n", 288 fwheads); 289 } 290 sectorsize = cp->provider->sectorsize; 291 if (sectorsize < 512) 292 break; 293 buf = g_read_data(cp, 0, 8192, &error); 294 if (buf == NULL || error != 0) 295 break; 296 ms->fwsectors = fwsectors; 297 ms->fwheads = fwheads; 298 ms->sectorsize = sectorsize; 299 g_topology_lock(); 300 g_pc98_modify(gp, ms, buf); 301 g_topology_unlock(); 302 g_free(buf); 303 break; 304 } while (0); 305 g_topology_lock(); 306 g_access_rel(cp, -1, 0, 0); 307 if (LIST_EMPTY(&gp->provider)) { 308 g_slice_spoiled(cp); 309 return (NULL); 310 } 311 return (gp); 312} 313 314static struct g_class g_pc98_class = { 315 .name = PC98_CLASS_NAME, 316 .taste = g_pc98_taste, 317}; 318 319DECLARE_GEOM_CLASS(g_pc98_class, g_pc98); 320