geom_pc98.c revision 230643
1178676Ssam/*- 2178676Ssam * Copyright (c) 2002 Poul-Henning Kamp 3178676Ssam * Copyright (c) 2002 Networks Associates Technology, Inc. 4178676Ssam * All rights reserved. 5178676Ssam * 6178676Ssam * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7178676Ssam * and NAI Labs, the Security Research Division of Network Associates, Inc. 8178676Ssam * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9178676Ssam * DARPA CHATS research program. 10178676Ssam * 11178676Ssam * Redistribution and use in source and binary forms, with or without 12178676Ssam * modification, are permitted provided that the following conditions 13178676Ssam * are met: 14178676Ssam * 1. Redistributions of source code must retain the above copyright 15178676Ssam * notice, this list of conditions and the following disclaimer. 16178676Ssam * 2. Redistributions in binary form must reproduce the above copyright 17178676Ssam * notice, this list of conditions and the following disclaimer in the 18178676Ssam * documentation and/or other materials provided with the distribution. 19178676Ssam * 20178676Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21178676Ssam * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22178676Ssam * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23178676Ssam * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24178676Ssam * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25178676Ssam * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26178676Ssam * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27178676Ssam * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28261971Sbrueffer * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29206622Suqs * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30178676Ssam * SUCH DAMAGE. 31178676Ssam */ 32178676Ssam 33233568Sbschmidt#include <sys/cdefs.h> 34178676Ssam__FBSDID("$FreeBSD: head/sys/geom/geom_pc98.c 230643 2012-01-28 14:00:21Z attilio $"); 35178676Ssam 36178676Ssam#include <sys/param.h> 37178676Ssam#include <sys/endian.h> 38178676Ssam#include <sys/systm.h> 39178676Ssam#include <sys/sysctl.h> 40178676Ssam#include <sys/kernel.h> 41178676Ssam#include <sys/fcntl.h> 42178676Ssam#include <sys/malloc.h> 43178676Ssam#include <sys/bio.h> 44178676Ssam#include <sys/lock.h> 45198521Sbrueffer#include <sys/mutex.h> 46198521Sbrueffer#include <sys/proc.h> 47198470Srpaulo#include <sys/sbuf.h> 48261971Sbrueffer 49261971Sbrueffer#include <sys/diskpc98.h> 50261971Sbrueffer#include <geom/geom.h> 51198470Srpaulo#include <geom/geom_slice.h> 52198470Srpaulo 53203691SbrucecFEATURE(geom_pc98, "GEOM NEC PC9800 partitioning support"); 54203691Sbrucec 55233568Sbschmidt#define PC98_CLASS_NAME "PC98" 56233568Sbschmidt 57210289Sbschmidtstruct g_pc98_softc { 58198470Srpaulo u_int fwsectors, fwheads, sectorsize; 59198470Srpaulo int type[NDOSPART]; 60198470Srpaulo u_char sec[8192]; 61198470Srpaulo}; 62198470Srpaulo 63198470Srpaulostatic void 64198470Srpaulog_pc98_print(int i, struct pc98_partition *dp) 65198470Srpaulo{ 66198470Srpaulo char sname[17]; 67178676Ssam 68198521Sbrueffer strncpy(sname, dp->dp_name, 16); 69178676Ssam sname[16] = '\0'; 70178676Ssam 71178676Ssam hexdump(dp, sizeof(dp[0]), NULL, 0); 72261971Sbrueffer printf("[%d] mid:%d(0x%x) sid:%d(0x%x)", 73261971Sbrueffer i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid); 74261971Sbrueffer printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect); 75198470Srpaulo printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect); 76198470Srpaulo printf(" sname:%s\n", sname); 77203691Sbrucec} 78203691Sbrucec 79233568Sbschmidt/* 80233568Sbschmidt * XXX: Add gctl_req arg and give good error msgs. 81210289Sbschmidt * XXX: Check that length argument does not bring boot code inside any slice. 82178676Ssam */ 83178676Ssamstatic int 84178676Ssamg_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused) 85178676Ssam{ 86233568Sbschmidt int i, error; 87233568Sbschmidt off_t s[NDOSPART], l[NDOSPART]; 88233568Sbschmidt struct pc98_partition dp[NDOSPART]; 89233568Sbschmidt 90233568Sbschmidt g_topology_assert(); 91233568Sbschmidt 92233568Sbschmidt if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa) 93233568Sbschmidt return (EBUSY); 94233568Sbschmidt 95233568Sbschmidt#if 0 96233568Sbschmidt /* 97233568Sbschmidt * By convetion, it seems that the ipl program has a jump at location 98233568Sbschmidt * 0 to the real start of the boot loader. By convetion, it appears 99233568Sbschmidt * that after this jump, there's a string, terminated by at last one, 100233568Sbschmidt * if not more, zeros, followed by the target of the jump. FreeBSD's 101233568Sbschmidt * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for 102233568Sbschmidt * compatibility with some older boot loader. Linux98's boot loader 103233568Sbschmidt * appears to use 'Linux 98' followed by only two. GRUB/98 appears to 104233568Sbschmidt * use 'GRUB/98 ' followed by none. These last two appear to be 105178676Ssam * ported from the ia32 versions, but appear to show similar 106178676Ssam * convention. Grub/98 has an additional NOP after the jmp, which 107248507Sglebius * isn't present in others. 108178676Ssam * 109178676Ssam * The following test was inspired by looking only at partitions 110178676Ssam * with FreeBSD's boot0 (or one that it is compatible with). As 111178676Ssam * such, if failed when other IPL programs were used. 112178676Ssam */ 113178676Ssam if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1') 114178676Ssam return (EBUSY); 115178676Ssam#endif 116178676Ssam 117178676Ssam for (i = 0; i < NDOSPART; i++) 118178676Ssam pc98_partition_dec( 119178676Ssam sec + 512 + i * sizeof(struct pc98_partition), &dp[i]); 120178676Ssam 121178676Ssam for (i = 0; i < NDOSPART; i++) { 122178676Ssam /* If start and end are identical it's bogus */ 123178676Ssam if (dp[i].dp_ssect == dp[i].dp_esect && 124178676Ssam dp[i].dp_shd == dp[i].dp_ehd && 125178676Ssam dp[i].dp_scyl == dp[i].dp_ecyl) 126178676Ssam s[i] = l[i] = 0; 127178676Ssam else if (dp[i].dp_ecyl == 0) 128178676Ssam s[i] = l[i] = 0; 129178676Ssam else { 130178676Ssam s[i] = (off_t)dp[i].dp_scyl * 131178676Ssam ms->fwsectors * ms->fwheads * ms->sectorsize; 132178676Ssam l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) * 133178676Ssam ms->fwsectors * ms->fwheads * ms->sectorsize; 134178676Ssam } 135178676Ssam if (bootverbose) { 136178676Ssam printf("PC98 Slice %d on %s:\n", i + 1, gp->name); 137178676Ssam g_pc98_print(i, dp + i); 138178676Ssam } 139178676Ssam if (s[i] < 0 || l[i] < 0) 140178676Ssam error = EBUSY; 141178676Ssam else 142178676Ssam error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK, 143178676Ssam s[i], l[i], ms->sectorsize, 144178676Ssam "%ss%d", gp->name, i + 1); 145178676Ssam if (error) 146178676Ssam return (error); 147178676Ssam } 148178676Ssam 149178676Ssam for (i = 0; i < NDOSPART; i++) { 150178676Ssam ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid; 151178676Ssam g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i], 152178676Ssam ms->sectorsize, "%ss%d", gp->name, i + 1); 153178676Ssam } 154178676Ssam 155178676Ssam bcopy(sec, ms->sec, sizeof (ms->sec)); 156178676Ssam 157233648Seadler return (0); 158178676Ssam} 159193884Ssam 160178676Ssamstatic int 161178676Ssamg_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td) 162178676Ssam{ 163178676Ssam struct g_geom *gp; 164178676Ssam struct g_pc98_softc *ms; 165178676Ssam struct g_slicer *gsp; 166178676Ssam struct g_consumer *cp; 167178676Ssam int error, opened; 168178676Ssam 169178676Ssam gp = pp->geom; 170178676Ssam gsp = gp->softc; 171178676Ssam ms = gsp->softc; 172178676Ssam 173191950Ssam opened = 0; 174178676Ssam error = 0; 175178676Ssam switch(cmd) { 176178676Ssam case DIOCSPC98: { 177178676Ssam if (!(fflag & FWRITE)) 178178676Ssam return (EPERM); 179178676Ssam DROP_GIANT(); 180178966Sbrueffer g_topology_lock(); 181178676Ssam cp = LIST_FIRST(&gp->consumer); 182178676Ssam if (cp->acw == 0) { 183178676Ssam error = g_access(cp, 0, 1, 0); 184178676Ssam if (error == 0) 185235317Sgjb opened = 1; 186 } 187 if (!error) 188 error = g_pc98_modify(gp, ms, data, 8192); 189 if (!error) 190 error = g_write_data(cp, 0, data, 8192); 191 if (opened) 192 g_access(cp, 0, -1 , 0); 193 g_topology_unlock(); 194 PICKUP_GIANT(); 195 return(error); 196 } 197 default: 198 return (ENOIOCTL); 199 } 200} 201 202static int 203g_pc98_start(struct bio *bp) 204{ 205 struct g_provider *pp; 206 struct g_geom *gp; 207 struct g_pc98_softc *mp; 208 struct g_slicer *gsp; 209 int idx; 210 211 pp = bp->bio_to; 212 idx = pp->index; 213 gp = pp->geom; 214 gsp = gp->softc; 215 mp = gsp->softc; 216 if (bp->bio_cmd == BIO_GETATTR) { 217 if (g_handleattr_int(bp, "PC98::type", mp->type[idx])) 218 return (1); 219 if (g_handleattr_off_t(bp, "PC98::offset", 220 gsp->slices[idx].offset)) 221 return (1); 222 } 223 224 return (0); 225} 226 227static void 228g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 229 struct g_consumer *cp __unused, struct g_provider *pp) 230{ 231 struct g_pc98_softc *mp; 232 struct g_slicer *gsp; 233 struct pc98_partition dp; 234 char sname[17]; 235 236 gsp = gp->softc; 237 mp = gsp->softc; 238 g_slice_dumpconf(sb, indent, gp, cp, pp); 239 if (pp != NULL) { 240 pc98_partition_dec( 241 mp->sec + 512 + 242 pp->index * sizeof(struct pc98_partition), &dp); 243 strncpy(sname, dp.dp_name, 16); 244 sname[16] = '\0'; 245 if (indent == NULL) { 246 sbuf_printf(sb, " ty %d", mp->type[pp->index]); 247 sbuf_printf(sb, " sn %s", sname); 248 } else { 249 sbuf_printf(sb, "%s<type>%d</type>\n", indent, 250 mp->type[pp->index]); 251 sbuf_printf(sb, "%s<sname>%s</sname>\n", indent, 252 sname); 253 } 254 } 255} 256 257static struct g_geom * 258g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags) 259{ 260 struct g_geom *gp; 261 struct g_consumer *cp; 262 int error; 263 struct g_pc98_softc *ms; 264 u_int fwsectors, fwheads, sectorsize; 265 u_char *buf; 266 267 g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name); 268 g_topology_assert(); 269 if (flags == G_TF_NORMAL && 270 !strcmp(pp->geom->class->name, PC98_CLASS_NAME)) 271 return (NULL); 272 gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start); 273 if (gp == NULL) 274 return (NULL); 275 g_topology_unlock(); 276 do { 277 if (gp->rank != 2 && flags == G_TF_NORMAL) 278 break; 279 error = g_getattr("GEOM::fwsectors", cp, &fwsectors); 280 if (error || fwsectors == 0) { 281 fwsectors = 17; 282 if (bootverbose) 283 printf("g_pc98_taste: guessing %d sectors\n", 284 fwsectors); 285 } 286 error = g_getattr("GEOM::fwheads", cp, &fwheads); 287 if (error || fwheads == 0) { 288 fwheads = 8; 289 if (bootverbose) 290 printf("g_pc98_taste: guessing %d heads\n", 291 fwheads); 292 } 293 sectorsize = cp->provider->sectorsize; 294 if (sectorsize % 512 != 0) 295 break; 296 buf = g_read_data(cp, 0, 8192, NULL); 297 if (buf == NULL) 298 break; 299 ms->fwsectors = fwsectors; 300 ms->fwheads = fwheads; 301 ms->sectorsize = sectorsize; 302 g_topology_lock(); 303 g_pc98_modify(gp, ms, buf, 8192); 304 g_topology_unlock(); 305 g_free(buf); 306 break; 307 } while (0); 308 g_topology_lock(); 309 g_access(cp, -1, 0, 0); 310 if (LIST_EMPTY(&gp->provider)) { 311 g_slice_spoiled(cp); 312 return (NULL); 313 } 314 return (gp); 315} 316 317static void 318g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb) 319{ 320 struct g_geom *gp; 321 struct g_consumer *cp; 322 struct g_pc98_softc *ms; 323 struct g_slicer *gsp; 324 int opened = 0, error = 0; 325 void *data; 326 int len; 327 328 g_topology_assert(); 329 gp = gctl_get_geom(req, mp, "geom"); 330 if (gp == NULL) 331 return; 332 if (strcmp(verb, "write PC98")) { 333 gctl_error(req, "Unknown verb"); 334 return; 335 } 336 gsp = gp->softc; 337 ms = gsp->softc; 338 data = gctl_get_param(req, "data", &len); 339 if (data == NULL) 340 return; 341 if (len < 8192 || (len % 512)) { 342 gctl_error(req, "Wrong request length"); 343 return; 344 } 345 cp = LIST_FIRST(&gp->consumer); 346 if (cp->acw == 0) { 347 error = g_access(cp, 0, 1, 0); 348 if (error == 0) 349 opened = 1; 350 } 351 if (!error) 352 error = g_pc98_modify(gp, ms, data, len); 353 if (error) 354 gctl_error(req, "conflict with open slices"); 355 if (!error) 356 error = g_write_data(cp, 0, data, len); 357 if (error) 358 gctl_error(req, "sector zero write failed"); 359 if (opened) 360 g_access(cp, 0, -1 , 0); 361 return; 362} 363 364static struct g_class g_pc98_class = { 365 .name = PC98_CLASS_NAME, 366 .version = G_VERSION, 367 .taste = g_pc98_taste, 368 .dumpconf = g_pc98_dumpconf, 369 .ctlreq = g_pc98_config, 370 .ioctl = g_pc98_ioctl, 371}; 372 373DECLARE_GEOM_CLASS(g_pc98_class, g_pc98); 374