Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/bios.c
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1 /*- 2 * Copyright (c) 1997 Michael Smith 3 * Copyright (c) 1998 Jonathan Lemon 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD: releng/5.1/sys/i386/i386/bios.c 112841 2003-03-30 05:24:52Z jake $ 28 */ 29 30 /* 31 * Code for dealing with the BIOS in x86 PC systems. 32 */ 33 34 #include "opt_isa.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/malloc.h> 40 #include <sys/bus.h> 41 #include <sys/pcpu.h> 42 #include <vm/vm.h> 43 #include <vm/pmap.h> 44 #include <machine/md_var.h> 45 #include <machine/segments.h> 46 #include <machine/stdarg.h> 47 #include <machine/vmparam.h> 48 #include <machine/pc/bios.h> 49 #ifdef DEV_ISA 50 #include <isa/isavar.h> 51 #include <isa/pnpreg.h> 52 #include <isa/pnpvar.h> 53 #endif 54 55 #define BIOS_START 0xe0000 56 #define BIOS_SIZE 0x20000 57 58 /* exported lookup results */ 59 struct bios32_SDentry PCIbios; 60 struct PnPBIOS_table *PnPBIOStable; 61 62 static u_int bios32_SDCI; 63 64 /* start fairly early */ 65 static void bios32_init(void *junk); 66 SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL); 67 68 /* 69 * bios32_init 70 * 71 * Locate various bios32 entities. 72 */ 73 static void 74 bios32_init(void *junk) 75 { 76 u_long sigaddr; 77 struct bios32_SDheader *sdh; 78 struct PnPBIOS_table *pt; 79 u_int8_t ck, *cv; 80 int i; 81 char *p; 82 83 /* 84 * BIOS32 Service Directory, PCI BIOS 85 */ 86 87 /* look for the signature */ 88 if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) { 89 90 /* get a virtual pointer to the structure */ 91 sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 92 for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) { 93 ck += cv[i]; 94 } 95 /* If checksum is OK, enable use of the entrypoint */ 96 if ((ck == 0) && (BIOS_START <= sdh->entry ) && 97 (sdh->entry < (BIOS_START + BIOS_SIZE))) { 98 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry); 99 if (bootverbose) { 100 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh); 101 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n", 102 sdh->entry, bios32_SDCI, sdh->revision, sdh->len); 103 } 104 105 /* Allow user override of PCI BIOS search */ 106 if (((p = getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) { 107 108 /* See if there's a PCI BIOS entrypoint here */ 109 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */ 110 if (!bios32_SDlookup(&PCIbios) && bootverbose) 111 printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry); 112 } 113 if (p != NULL) 114 freeenv(p); 115 } else { 116 printf("bios32: Bad BIOS32 Service Directory\n"); 117 } 118 } 119 120 /* 121 * PnP BIOS 122 * 123 * Allow user override of PnP BIOS search 124 */ 125 if ((((p = getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) && 126 ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) { 127 128 /* get a virtual pointer to the structure */ 129 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 130 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) { 131 ck += cv[i]; 132 } 133 /* If checksum is OK, enable use of the entrypoint */ 134 if (ck == 0) { 135 PnPBIOStable = pt; 136 if (bootverbose) { 137 printf("pnpbios: Found PnP BIOS data at %p\n", pt); 138 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n", 139 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf); 140 if ((pt->control & 0x3) == 0x01) 141 printf("pnpbios: Event flag at %x\n", pt->evflagaddr); 142 if (pt->oemdevid != 0) 143 printf("pnpbios: OEM ID %x\n", pt->oemdevid); 144 145 } 146 } else { 147 printf("pnpbios: Bad PnP BIOS data checksum\n"); 148 } 149 } 150 if (p != NULL) 151 freeenv(p); 152 if (bootverbose) { 153 /* look for other know signatures */ 154 printf("Other BIOS signatures found:\n"); 155 } 156 } 157 158 /* 159 * bios32_SDlookup 160 * 161 * Query the BIOS32 Service Directory for the service named in (ent), 162 * returns nonzero if the lookup fails. The caller must fill in 163 * (ent->ident), the remainder are populated on a successful lookup. 164 */ 165 int 166 bios32_SDlookup(struct bios32_SDentry *ent) 167 { 168 struct bios_regs args; 169 170 if (bios32_SDCI == 0) 171 return (1); 172 173 args.eax = ent->ident.id; /* set up arguments */ 174 args.ebx = args.ecx = args.edx = 0; 175 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL)); 176 if ((args.eax & 0xff) == 0) { /* success? */ 177 ent->base = args.ebx; 178 ent->len = args.ecx; 179 ent->entry = args.edx; 180 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry); 181 return (0); /* all OK */ 182 } 183 return (1); /* failed */ 184 } 185 186 187 /* 188 * bios_sigsearch 189 * 190 * Search some or all of the BIOS region for a signature string. 191 * 192 * (start) Optional offset returned from this function 193 * (for searching for multiple matches), or NULL 194 * to start the search from the base of the BIOS. 195 * Note that this will be a _physical_ address in 196 * the range 0xe0000 - 0xfffff. 197 * (sig) is a pointer to the byte(s) of the signature. 198 * (siglen) number of bytes in the signature. 199 * (paralen) signature paragraph (alignment) size. 200 * (sigofs) offset of the signature within the paragraph. 201 * 202 * Returns the _physical_ address of the found signature, 0 if the 203 * signature was not found. 204 */ 205 206 u_int32_t 207 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs) 208 { 209 u_char *sp, *end; 210 211 /* compute the starting address */ 212 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) { 213 sp = (char *)BIOS_PADDRTOVADDR(start); 214 } else if (start == 0) { 215 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START); 216 } else { 217 return 0; /* bogus start address */ 218 } 219 220 /* compute the end address */ 221 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE); 222 223 /* loop searching */ 224 while ((sp + sigofs + siglen) < end) { 225 226 /* compare here */ 227 if (!bcmp(sp + sigofs, sig, siglen)) { 228 /* convert back to physical address */ 229 return((u_int32_t)BIOS_VADDRTOPADDR(sp)); 230 } 231 sp += paralen; 232 } 233 return(0); 234 } 235 236 /* 237 * do not staticize, used by bioscall.s 238 */ 239 union { 240 struct { 241 u_short offset; 242 u_short segment; 243 } vec16; 244 struct { 245 u_int offset; 246 u_short segment; 247 } vec32; 248 } bioscall_vector; /* bios jump vector */ 249 250 void 251 set_bios_selectors(struct bios_segments *seg, int flags) 252 { 253 struct soft_segment_descriptor ssd = { 254 0, /* segment base address (overwritten) */ 255 0, /* length (overwritten) */ 256 SDT_MEMERA, /* segment type (overwritten) */ 257 0, /* priority level */ 258 1, /* descriptor present */ 259 0, 0, 260 1, /* descriptor size (overwritten) */ 261 0 /* granularity == byte units */ 262 }; 263 union descriptor *p_gdt; 264 265 #ifdef SMP 266 p_gdt = &gdt[PCPU_GET(cpuid) * NGDT]; 267 #else 268 p_gdt = gdt; 269 #endif 270 271 ssd.ssd_base = seg->code32.base; 272 ssd.ssd_limit = seg->code32.limit; 273 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd); 274 275 ssd.ssd_def32 = 0; 276 if (flags & BIOSCODE_FLAG) { 277 ssd.ssd_base = seg->code16.base; 278 ssd.ssd_limit = seg->code16.limit; 279 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd); 280 } 281 282 ssd.ssd_type = SDT_MEMRWA; 283 if (flags & BIOSDATA_FLAG) { 284 ssd.ssd_base = seg->data.base; 285 ssd.ssd_limit = seg->data.limit; 286 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd); 287 } 288 289 if (flags & BIOSUTIL_FLAG) { 290 ssd.ssd_base = seg->util.base; 291 ssd.ssd_limit = seg->util.limit; 292 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd); 293 } 294 295 if (flags & BIOSARGS_FLAG) { 296 ssd.ssd_base = seg->args.base; 297 ssd.ssd_limit = seg->args.limit; 298 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd); 299 } 300 } 301 302 extern int vm86pa; 303 extern void bios16_jmp(void); 304 305 /* 306 * this routine is really greedy with selectors, and uses 5: 307 * 308 * 32-bit code selector: to return to kernel 309 * 16-bit code selector: for running code 310 * data selector: for 16-bit data 311 * util selector: extra utility selector 312 * args selector: to handle pointers 313 * 314 * the util selector is set from the util16 entry in bios16_args, if a 315 * "U" specifier is seen. 316 * 317 * See <machine/pc/bios.h> for description of format specifiers 318 */ 319 int 320 bios16(struct bios_args *args, char *fmt, ...) 321 { 322 char *p, *stack, *stack_top; 323 va_list ap; 324 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; 325 u_int i, arg_start, arg_end; 326 pt_entry_t *pte; 327 pd_entry_t *ptd; 328 329 arg_start = 0xffffffff; 330 arg_end = 0; 331 332 /* 333 * Some BIOS entrypoints attempt to copy the largest-case 334 * argument frame (in order to generalise handling for 335 * different entry types). If our argument frame is 336 * smaller than this, the BIOS will reach off the top of 337 * our constructed stack segment. Pad the top of the stack 338 * with some garbage to avoid this. 339 */ 340 stack = (caddr_t)PAGE_SIZE - 32; 341 342 va_start(ap, fmt); 343 for (p = fmt; p && *p; p++) { 344 switch (*p) { 345 case 'p': /* 32-bit pointer */ 346 i = va_arg(ap, u_int); 347 arg_start = min(arg_start, i); 348 arg_end = max(arg_end, i); 349 flags |= BIOSARGS_FLAG; 350 stack -= 4; 351 break; 352 353 case 'i': /* 32-bit integer */ 354 i = va_arg(ap, u_int); 355 stack -= 4; 356 break; 357 358 case 'U': /* 16-bit selector */ 359 flags |= BIOSUTIL_FLAG; 360 /* FALLTHROUGH */ 361 case 'D': /* 16-bit selector */ 362 case 'C': /* 16-bit selector */ 363 stack -= 2; 364 break; 365 366 case 's': /* 16-bit integer passed as an int */ 367 i = va_arg(ap, int); 368 stack -= 2; 369 break; 370 371 default: 372 return (EINVAL); 373 } 374 } 375 376 if (flags & BIOSARGS_FLAG) { 377 if (arg_end - arg_start > ctob(16)) 378 return (EACCES); 379 args->seg.args.base = arg_start; 380 args->seg.args.limit = 0xffff; 381 } 382 383 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME; 384 args->seg.code32.limit = 0xffff; 385 386 ptd = (pd_entry_t *)rcr3(); 387 #ifdef PAE 388 if (ptd == IdlePDPT) { 389 #else 390 if (ptd == IdlePTD) { 391 #endif 392 /* 393 * no page table, so create one and install it. 394 */ 395 pte = (pt_entry_t *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 396 ptd = (pd_entry_t *)((u_int)IdlePTD + KERNBASE); 397 *ptd = vtophys(pte) | PG_RW | PG_V; 398 } else { 399 /* 400 * this is a user-level page table 401 */ 402 pte = PTmap; 403 } 404 /* 405 * install pointer to page 0. we don't need to flush the tlb, 406 * since there should not be a previous mapping for page 0. 407 */ 408 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; 409 410 stack_top = stack; 411 va_start(ap, fmt); 412 for (p = fmt; p && *p; p++) { 413 switch (*p) { 414 case 'p': /* 32-bit pointer */ 415 i = va_arg(ap, u_int); 416 *(u_int *)stack = (i - arg_start) | 417 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16); 418 stack += 4; 419 break; 420 421 case 'i': /* 32-bit integer */ 422 i = va_arg(ap, u_int); 423 *(u_int *)stack = i; 424 stack += 4; 425 break; 426 427 case 'U': /* 16-bit selector */ 428 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL); 429 stack += 2; 430 break; 431 432 case 'D': /* 16-bit selector */ 433 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL); 434 stack += 2; 435 break; 436 437 case 'C': /* 16-bit selector */ 438 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL); 439 stack += 2; 440 break; 441 442 case 's': /* 16-bit integer passed as an int */ 443 i = va_arg(ap, int); 444 *(u_short *)stack = i; 445 stack += 2; 446 break; 447 448 default: 449 return (EINVAL); 450 } 451 } 452 453 set_bios_selectors(&args->seg, flags); 454 bioscall_vector.vec16.offset = (u_short)args->entry; 455 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); 456 457 i = bios16_call(&args->r, stack_top); 458 459 if (pte == PTmap) { 460 *pte = 0; /* remove entry */ 461 } else { 462 *ptd = 0; /* remove page table */ 463 free(pte, M_TEMP); /* ... and free it */ 464 } 465 466 /* 467 * XXX only needs to be invlpg(0) but that doesn't work on the 386 468 */ 469 pmap_invalidate_all(kernel_pmap); 470 471 return (i); 472 } 473 474 #ifdef DEV_ISA 475 /* 476 * PnP BIOS interface; enumerate devices only known to the system 477 * BIOS and save information about them for later use. 478 */ 479 480 struct pnp_sysdev 481 { 482 u_int16_t size; 483 u_int8_t handle; 484 u_int32_t devid; 485 u_int8_t type[3]; 486 u_int16_t attrib; 487 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ 488 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ 489 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */ 490 #define PNPATTR_INPUT (1<<3) /* can be primary input */ 491 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ 492 #define PNPATTR_DOCK (1<<5) /* is a docking station */ 493 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ 494 #define PNPATTR_CONFIG_STATIC (0) 495 #define PNPATTR_CONFIG_DYNAMIC (1) 496 #define PNPATTR_CONFIG_DYNONLY (3) 497 #define PNPATTR_CONFIG(a) (((a) >> 7) & 0x3) 498 /* device-specific data comes here */ 499 u_int8_t devdata[0]; 500 } __packed; 501 502 /* We have to cluster arguments within a 64k range for the bios16 call */ 503 struct pnp_sysdevargs 504 { 505 u_int16_t next; 506 struct pnp_sysdev node; 507 }; 508 509 /* 510 * This function is called after the bus has assigned resource 511 * locations for a logical device. 512 */ 513 static void 514 pnpbios_set_config(void *arg, struct isa_config *config, int enable) 515 { 516 } 517 518 /* 519 * Quiz the PnP BIOS, build a list of PNP IDs and resource data. 520 */ 521 static void 522 pnpbios_identify(driver_t *driver, device_t parent) 523 { 524 struct PnPBIOS_table *pt = PnPBIOStable; 525 struct bios_args args; 526 struct pnp_sysdev *pd; 527 struct pnp_sysdevargs *pda; 528 u_int16_t ndevs, bigdev; 529 int error, currdev; 530 u_int8_t *devnodebuf, tag; 531 u_int32_t *devid, *compid; 532 int idx, left; 533 device_t dev; 534 535 /* no PnP BIOS information */ 536 if (pt == NULL) 537 return; 538 539 /* ACPI already active */ 540 if (devclass_get_softc(devclass_find("ACPI"), 0) != NULL) 541 return; 542 543 /* get count of PnP devices */ 544 bzero(&args, sizeof(args)); 545 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); 546 args.seg.code16.limit = 0xffff; /* XXX ? */ 547 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); 548 args.seg.data.limit = 0xffff; 549 args.entry = pt->pmentryoffset; 550 551 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) 552 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); 553 ndevs &= 0xff; /* clear high byte garbage */ 554 if (bootverbose) 555 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); 556 557 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), 558 M_DEVBUF, M_NOWAIT); 559 pda = (struct pnp_sysdevargs *)devnodebuf; 560 pd = &pda->node; 561 562 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { 563 564 bzero(pd, bigdev); 565 pda->next = currdev; 566 /* get current configuration */ 567 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, 1))) { 568 printf("pnpbios: error %d making BIOS16 call\n", error); 569 break; 570 } 571 if ((error = (args.r.eax & 0xff))) { 572 if (bootverbose) 573 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); 574 if (error & 0x80) 575 break; 576 } 577 currdev = pda->next; 578 if (pd->size < sizeof(struct pnp_sysdev)) { 579 printf("pnpbios: bogus system node data, aborting scan\n"); 580 break; 581 } 582 583 /* 584 * If we are in APIC_IO mode, we should ignore the ISA PIC if it 585 * shows up. Likewise, in !APIC_IO mode, we should ignore the 586 * APIC (less important). 587 * This is significant because the ISA PIC will claim IRQ 2 (which 588 * it uses for chaining), while in APIC mode this is a valid IRQ 589 * available for general use. 590 */ 591 #ifdef APIC_IO 592 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */ 593 continue; 594 #else 595 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */ 596 continue; 597 #endif 598 599 /* Add the device and parse its resources */ 600 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 601 isa_set_vendorid(dev, pd->devid); 602 isa_set_logicalid(dev, pd->devid); 603 /* 604 * It appears that some PnP BIOS doesn't allow us to re-enable 605 * the embedded system device once it is disabled. We shall 606 * mark all system device nodes as "cannot be disabled", regardless 607 * of actual settings in the device attribute byte. 608 * XXX 609 isa_set_configattr(dev, 610 ((pd->attrib & PNPATTR_NODISABLE) ? 0 : ISACFGATTR_CANDISABLE) | 611 ((!(pd->attrib & PNPATTR_NOCONFIG) && 612 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC) 613 ? ISACFGATTR_DYNAMIC : 0)); 614 */ 615 isa_set_configattr(dev, 616 (!(pd->attrib & PNPATTR_NOCONFIG) && 617 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC) 618 ? ISACFGATTR_DYNAMIC : 0); 619 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0); 620 pnp_parse_resources(dev, &pd->devdata[0], 621 pd->size - sizeof(struct pnp_sysdev), 0); 622 if (!device_get_desc(dev)) 623 device_set_desc_copy(dev, pnp_eisaformat(pd->devid)); 624 625 /* Find device IDs */ 626 devid = &pd->devid; 627 compid = NULL; 628 629 /* look for a compatible device ID too */ 630 left = pd->size - sizeof(struct pnp_sysdev); 631 idx = 0; 632 while (idx < left) { 633 tag = pd->devdata[idx++]; 634 if (PNP_RES_TYPE(tag) == 0) { 635 /* Small resource */ 636 switch (PNP_SRES_NUM(tag)) { 637 case PNP_TAG_COMPAT_DEVICE: 638 compid = (u_int32_t *)(pd->devdata + idx); 639 if (bootverbose) 640 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); 641 /* FALLTHROUGH */ 642 case PNP_TAG_END: 643 idx = left; 644 break; 645 default: 646 idx += PNP_SRES_LEN(tag); 647 break; 648 } 649 } else 650 /* Large resource, skip it */ 651 idx += *(u_int16_t *)(pd->devdata + idx) + 2; 652 } 653 if (bootverbose) { 654 printf("pnpbios: handle %d device ID %s (%08x)", 655 pd->handle, pnp_eisaformat(*devid), *devid); 656 if (compid != NULL) 657 printf(" compat ID %s (%08x)", 658 pnp_eisaformat(*compid), *compid); 659 printf("\n"); 660 } 661 } 662 } 663 664 static device_method_t pnpbios_methods[] = { 665 /* Device interface */ 666 DEVMETHOD(device_identify, pnpbios_identify), 667 668 { 0, 0 } 669 }; 670 671 static driver_t pnpbios_driver = { 672 "pnpbios", 673 pnpbios_methods, 674 1, /* no softc */ 675 }; 676 677 static devclass_t pnpbios_devclass; 678 679 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0); 680 #endif /* DEV_ISA */
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