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 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1997 Michael Smith 5 * Copyright (c) 1998 Jonathan Lemon 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 /* 34 * Code for dealing with the BIOS in x86 PC systems. 35 */ 36 37 #include "opt_isa.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/malloc.h> 43 #include <sys/module.h> 44 #include <sys/bus.h> 45 #include <sys/pcpu.h> 46 #include <vm/vm.h> 47 #include <vm/pmap.h> 48 #include <machine/md_var.h> 49 #include <machine/segments.h> 50 #include <machine/stdarg.h> 51 #include <machine/vmparam.h> 52 #include <machine/pc/bios.h> 53 #ifdef DEV_ISA 54 #include <isa/isavar.h> 55 #include <isa/pnpreg.h> 56 #include <isa/pnpvar.h> 57 #endif 58 59 #define BIOS_START 0xe0000 60 #define BIOS_SIZE 0x20000 61 62 /* exported lookup results */ 63 struct bios32_SDentry PCIbios; 64 65 static struct PnPBIOS_table *PnPBIOStable; 66 67 static u_int bios32_SDCI; 68 69 /* start fairly early */ 70 static void bios32_init(void *junk); 71 SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL); 72 73 /* 74 * bios32_init 75 * 76 * Locate various bios32 entities. 77 */ 78 static void 79 bios32_init(void *junk) 80 { 81 u_long sigaddr; 82 struct bios32_SDheader *sdh; 83 struct PnPBIOS_table *pt; 84 u_int8_t ck, *cv; 85 int i; 86 char *p; 87 88 /* 89 * BIOS32 Service Directory, PCI BIOS 90 */ 91 92 /* look for the signature */ 93 if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) { 94 /* get a virtual pointer to the structure */ 95 sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 96 for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) { 97 ck += cv[i]; 98 } 99 /* If checksum is OK, enable use of the entrypoint */ 100 if ((ck == 0) && (BIOS_START <= sdh->entry ) && 101 (sdh->entry < (BIOS_START + BIOS_SIZE))) { 102 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry); 103 if (bootverbose) { 104 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh); 105 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n", 106 sdh->entry, bios32_SDCI, sdh->revision, sdh->len); 107 } 108 109 /* Allow user override of PCI BIOS search */ 110 if (((p = kern_getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) { 111 /* See if there's a PCI BIOS entrypoint here */ 112 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */ 113 if (!bios32_SDlookup(&PCIbios) && bootverbose) 114 printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry); 115 } 116 if (p != NULL) 117 freeenv(p); 118 } else { 119 printf("bios32: Bad BIOS32 Service Directory\n"); 120 } 121 } 122 123 /* 124 * PnP BIOS 125 * 126 * Allow user override of PnP BIOS search 127 */ 128 if ((((p = kern_getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) && 129 ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) { 130 /* get a virtual pointer to the structure */ 131 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 132 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) { 133 ck += cv[i]; 134 } 135 /* If checksum is OK, enable use of the entrypoint */ 136 if (ck == 0) { 137 PnPBIOStable = pt; 138 if (bootverbose) { 139 printf("pnpbios: Found PnP BIOS data at %p\n", pt); 140 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n", 141 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf); 142 if ((pt->control & 0x3) == 0x01) 143 printf("pnpbios: Event flag at %x\n", pt->evflagaddr); 144 if (pt->oemdevid != 0) 145 printf("pnpbios: OEM ID %x\n", pt->oemdevid); 146 147 } 148 } else { 149 printf("pnpbios: Bad PnP BIOS data checksum\n"); 150 } 151 } 152 if (p != NULL) 153 freeenv(p); 154 if (bootverbose) { 155 /* look for other know signatures */ 156 printf("Other BIOS signatures found:\n"); 157 } 158 } 159 160 /* 161 * bios32_SDlookup 162 * 163 * Query the BIOS32 Service Directory for the service named in (ent), 164 * returns nonzero if the lookup fails. The caller must fill in 165 * (ent->ident), the remainder are populated on a successful lookup. 166 */ 167 int 168 bios32_SDlookup(struct bios32_SDentry *ent) 169 { 170 struct bios_regs args; 171 172 if (bios32_SDCI == 0) 173 return (1); 174 175 args.eax = ent->ident.id; /* set up arguments */ 176 args.ebx = args.ecx = args.edx = 0; 177 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL)); 178 if ((args.eax & 0xff) == 0) { /* success? */ 179 ent->base = args.ebx; 180 ent->len = args.ecx; 181 ent->entry = args.edx; 182 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry); 183 return (0); /* all OK */ 184 } 185 return (1); /* failed */ 186 } 187 188 /* 189 * bios_sigsearch 190 * 191 * Search some or all of the BIOS region for a signature string. 192 * 193 * (start) Optional offset returned from this function 194 * (for searching for multiple matches), or NULL 195 * to start the search from the base of the BIOS. 196 * Note that this will be a _physical_ address in 197 * the range 0xe0000 - 0xfffff. 198 * (sig) is a pointer to the byte(s) of the signature. 199 * (siglen) number of bytes in the signature. 200 * (paralen) signature paragraph (alignment) size. 201 * (sigofs) offset of the signature within the paragraph. 202 * 203 * Returns the _physical_ address of the found signature, 0 if the 204 * signature was not found. 205 */ 206 207 u_int32_t 208 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs) 209 { 210 u_char *sp, *end; 211 212 /* compute the starting address */ 213 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) { 214 sp = (char *)BIOS_PADDRTOVADDR(start); 215 } else if (start == 0) { 216 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START); 217 } else { 218 return 0; /* bogus start address */ 219 } 220 221 /* compute the end address */ 222 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE); 223 224 /* loop searching */ 225 while ((sp + sigofs + siglen) < end) { 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 u_long vm86phystk; 304 extern void bios16_jmp(void); 305 306 /* 307 * this routine is really greedy with selectors, and uses 5: 308 * 309 * 32-bit code selector: to return to kernel 310 * 16-bit code selector: for running code 311 * data selector: for 16-bit data 312 * util selector: extra utility selector 313 * args selector: to handle pointers 314 * 315 * the util selector is set from the util16 entry in bios16_args, if a 316 * "U" specifier is seen. 317 * 318 * See <machine/pc/bios.h> for description of format specifiers 319 */ 320 int 321 bios16(struct bios_args *args, char *fmt, ...) 322 { 323 char *p, *stack, *stack_top; 324 va_list ap; 325 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; 326 u_int i, arg_start, arg_end; 327 void *bios16_pmap_handle; 328 arg_start = 0xffffffff; 329 arg_end = 0; 330 331 /* 332 * Some BIOS entrypoints attempt to copy the largest-case 333 * argument frame (in order to generalise handling for 334 * different entry types). If our argument frame is 335 * smaller than this, the BIOS will reach off the top of 336 * our constructed stack segment. Pad the top of the stack 337 * with some garbage to avoid this. 338 */ 339 stack = (caddr_t)PAGE_SIZE - 32; 340 341 va_start(ap, fmt); 342 for (p = fmt; p && *p; p++) { 343 switch (*p) { 344 case 'p': /* 32-bit pointer */ 345 i = va_arg(ap, u_int); 346 arg_start = min(arg_start, i); 347 arg_end = max(arg_end, i); 348 flags |= BIOSARGS_FLAG; 349 stack -= 4; 350 break; 351 352 case 'i': /* 32-bit integer */ 353 i = va_arg(ap, u_int); 354 stack -= 4; 355 break; 356 357 case 'U': /* 16-bit selector */ 358 flags |= BIOSUTIL_FLAG; 359 /* FALLTHROUGH */ 360 case 'D': /* 16-bit selector */ 361 case 'C': /* 16-bit selector */ 362 stack -= 2; 363 break; 364 365 case 's': /* 16-bit integer passed as an int */ 366 i = va_arg(ap, int); 367 stack -= 2; 368 break; 369 370 default: 371 va_end(ap); 372 return (EINVAL); 373 } 374 } 375 va_end(ap); 376 377 if (flags & BIOSARGS_FLAG) { 378 if (arg_end - arg_start > ctob(16)) 379 return (EACCES); 380 args->seg.args.base = arg_start; 381 args->seg.args.limit = 0xffff; 382 } 383 384 args->seg.code32.base = pmap_pg_frame((u_int)&bios16_jmp); 385 args->seg.code32.limit = 0xffff; 386 387 bios16_pmap_handle = pmap_bios16_enter(); 388 389 stack_top = stack; 390 va_start(ap, fmt); 391 for (p = fmt; p && *p; p++) { 392 switch (*p) { 393 case 'p': /* 32-bit pointer */ 394 i = va_arg(ap, u_int); 395 *(u_int *)stack = (i - arg_start) | 396 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16); 397 stack += 4; 398 break; 399 400 case 'i': /* 32-bit integer */ 401 i = va_arg(ap, u_int); 402 *(u_int *)stack = i; 403 stack += 4; 404 break; 405 406 case 'U': /* 16-bit selector */ 407 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL); 408 stack += 2; 409 break; 410 411 case 'D': /* 16-bit selector */ 412 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL); 413 stack += 2; 414 break; 415 416 case 'C': /* 16-bit selector */ 417 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL); 418 stack += 2; 419 break; 420 421 case 's': /* 16-bit integer passed as an int */ 422 i = va_arg(ap, int); 423 *(u_short *)stack = i; 424 stack += 2; 425 break; 426 427 default: 428 va_end(ap); 429 return (EINVAL); 430 } 431 } 432 va_end(ap); 433 434 set_bios_selectors(&args->seg, flags); 435 bioscall_vector.vec16.offset = (u_short)args->entry; 436 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); 437 438 i = bios16_call(&args->r, stack_top); 439 pmap_bios16_leave(bios16_pmap_handle); 440 return (i); 441 } 442 443 int 444 bios_oem_strings(struct bios_oem *oem, u_char *buffer, size_t maxlen) 445 { 446 size_t idx = 0; 447 struct bios_oem_signature *sig; 448 u_int from, to; 449 u_char c, *s, *se, *str, *bios_str; 450 size_t i, off, len, tot; 451 452 if ( !oem || !buffer || maxlen<2 ) 453 return(-1); 454 455 sig = oem->signature; 456 if (!sig) 457 return(-2); 458 459 from = oem->range.from; 460 to = oem->range.to; 461 if ( (to<=from) || (from<BIOS_START) || (to>(BIOS_START+BIOS_SIZE)) ) 462 return(-3); 463 464 while (sig->anchor != NULL) { 465 str = sig->anchor; 466 len = strlen(str); 467 off = sig->offset; 468 tot = sig->totlen; 469 /* make sure offset doesn't go beyond bios area */ 470 if ( (to+off)>(BIOS_START+BIOS_SIZE) || 471 ((from+off)<BIOS_START) ) { 472 printf("sys/i386/i386/bios.c: sig '%s' " 473 "from 0x%0x to 0x%0x offset %d " 474 "out of BIOS bounds 0x%0x - 0x%0x\n", 475 str, from, to, off, 476 BIOS_START, BIOS_START+BIOS_SIZE); 477 return(-4); 478 } 479 /* make sure we don't overrun return buffer */ 480 if (idx + tot > maxlen - 1) { 481 printf("sys/i386/i386/bios.c: sig '%s' " 482 "idx %d + tot %d = %d > maxlen-1 %d\n", 483 str, idx, tot, idx+tot, maxlen-1); 484 return(-5); 485 } 486 bios_str = NULL; 487 s = (u_char *)BIOS_PADDRTOVADDR(from); 488 se = (u_char *)BIOS_PADDRTOVADDR(to-len); 489 for (; s<se; s++) { 490 if (!bcmp(str, s, len)) { 491 bios_str = s; 492 break; 493 } 494 } 495 /* 496 * store pretty version of totlen bytes of bios string with 497 * given offset; 0x20 - 0x7E are printable; uniquify spaces 498 */ 499 if (bios_str) { 500 for (i=0; i<tot; i++) { 501 c = bios_str[i+off]; 502 if ( (c < 0x20) || (c > 0x7E) ) 503 c = ' '; 504 if (idx == 0) { 505 if (c != ' ') 506 buffer[idx++] = c; 507 } else if ( (c != ' ') || 508 ((c == ' ') && (buffer[idx-1] != ' ')) ) 509 buffer[idx++] = c; 510 } 511 } 512 sig++; 513 } 514 /* remove a final trailing space */ 515 if ( (idx > 1) && (buffer[idx-1] == ' ') ) 516 idx--; 517 buffer[idx] = '\0'; 518 return (idx); 519 } 520 521 #ifdef DEV_ISA 522 /* 523 * PnP BIOS interface; enumerate devices only known to the system 524 * BIOS and save information about them for later use. 525 */ 526 527 struct pnp_sysdev 528 { 529 u_int16_t size; 530 u_int8_t handle; 531 u_int32_t devid; 532 u_int8_t type[3]; 533 u_int16_t attrib; 534 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ 535 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ 536 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */ 537 #define PNPATTR_INPUT (1<<3) /* can be primary input */ 538 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ 539 #define PNPATTR_DOCK (1<<5) /* is a docking station */ 540 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ 541 #define PNPATTR_CONFIG_STATIC (0) 542 #define PNPATTR_CONFIG_DYNAMIC (1) 543 #define PNPATTR_CONFIG_DYNONLY (3) 544 #define PNPATTR_CONFIG(a) (((a) >> 7) & 0x3) 545 /* device-specific data comes here */ 546 u_int8_t devdata[0]; 547 } __packed; 548 549 /* We have to cluster arguments within a 64k range for the bios16 call */ 550 struct pnp_sysdevargs 551 { 552 u_int16_t next; 553 struct pnp_sysdev node; 554 }; 555 556 /* 557 * This function is called after the bus has assigned resource 558 * locations for a logical device. 559 */ 560 static void 561 pnpbios_set_config(void *arg, struct isa_config *config, int enable) 562 { 563 } 564 565 /* 566 * Quiz the PnP BIOS, build a list of PNP IDs and resource data. 567 */ 568 static void 569 pnpbios_identify(driver_t *driver, device_t parent) 570 { 571 struct PnPBIOS_table *pt = PnPBIOStable; 572 struct bios_args args; 573 struct pnp_sysdev *pd; 574 struct pnp_sysdevargs *pda; 575 u_int16_t ndevs, bigdev; 576 int error, currdev; 577 u_int8_t *devnodebuf, tag; 578 u_int32_t *devid, *compid; 579 int idx, left; 580 device_t dev; 581 582 /* no PnP BIOS information */ 583 if (pt == NULL) 584 return; 585 586 /* Check to see if ACPI is already active. */ 587 dev = devclass_get_device(devclass_find("acpi"), 0); 588 if (dev != NULL && device_is_attached(dev)) 589 return; 590 591 /* get count of PnP devices */ 592 bzero(&args, sizeof(args)); 593 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); 594 args.seg.code16.limit = 0xffff; /* XXX ? */ 595 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); 596 args.seg.data.limit = 0xffff; 597 args.entry = pt->pmentryoffset; 598 599 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) { 600 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); 601 return; 602 } 603 ndevs &= 0xff; /* clear high byte garbage */ 604 if (bootverbose) 605 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); 606 607 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), 608 M_DEVBUF, M_NOWAIT); 609 if (devnodebuf == NULL) { 610 printf("pnpbios: cannot allocate memory, bailing\n"); 611 return; 612 } 613 pda = (struct pnp_sysdevargs *)devnodebuf; 614 pd = &pda->node; 615 616 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { 617 bzero(pd, bigdev); 618 pda->next = currdev; 619 /* get current configuration */ 620 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, 1))) { 621 printf("pnpbios: error %d making BIOS16 call\n", error); 622 break; 623 } 624 if ((error = (args.r.eax & 0xff))) { 625 if (bootverbose) 626 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); 627 if (error & 0x80) 628 break; 629 } 630 currdev = pda->next; 631 if (pd->size < sizeof(struct pnp_sysdev)) { 632 printf("pnpbios: bogus system node data, aborting scan\n"); 633 break; 634 } 635 636 /* 637 * Ignore PICs so that we don't have to worry about the PICs 638 * claiming IRQs to prevent their use. The PIC drivers 639 * already ensure that invalid IRQs are not used. 640 */ 641 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */ 642 continue; 643 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */ 644 continue; 645 646 /* Add the device and parse its resources */ 647 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNPBIOS, NULL, -1); 648 isa_set_vendorid(dev, pd->devid); 649 isa_set_logicalid(dev, pd->devid); 650 /* 651 * It appears that some PnP BIOS doesn't allow us to re-enable 652 * the embedded system device once it is disabled. We shall 653 * mark all system device nodes as "cannot be disabled", regardless 654 * of actual settings in the device attribute byte. 655 * XXX 656 isa_set_configattr(dev, 657 ((pd->attrib & PNPATTR_NODISABLE) ? 0 : ISACFGATTR_CANDISABLE) | 658 ((!(pd->attrib & PNPATTR_NOCONFIG) && 659 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC) 660 ? ISACFGATTR_DYNAMIC : 0)); 661 */ 662 isa_set_configattr(dev, 663 (!(pd->attrib & PNPATTR_NOCONFIG) && 664 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC) 665 ? ISACFGATTR_DYNAMIC : 0); 666 isa_set_pnpbios_handle(dev, pd->handle); 667 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0); 668 pnp_parse_resources(dev, &pd->devdata[0], 669 pd->size - sizeof(struct pnp_sysdev), 0); 670 if (!device_get_desc(dev)) 671 device_set_desc_copy(dev, pnp_eisaformat(pd->devid)); 672 673 /* Find device IDs */ 674 devid = &pd->devid; 675 compid = NULL; 676 677 /* look for a compatible device ID too */ 678 left = pd->size - sizeof(struct pnp_sysdev); 679 idx = 0; 680 while (idx < left) { 681 tag = pd->devdata[idx++]; 682 if (PNP_RES_TYPE(tag) == 0) { 683 /* Small resource */ 684 switch (PNP_SRES_NUM(tag)) { 685 case PNP_TAG_COMPAT_DEVICE: 686 compid = (u_int32_t *)(pd->devdata + idx); 687 if (bootverbose) 688 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); 689 /* FALLTHROUGH */ 690 case PNP_TAG_END: 691 idx = left; 692 break; 693 default: 694 idx += PNP_SRES_LEN(tag); 695 break; 696 } 697 } else 698 /* Large resource, skip it */ 699 idx += *(u_int16_t *)(pd->devdata + idx) + 2; 700 } 701 if (bootverbose) { 702 printf("pnpbios: handle %d device ID %s (%08x)", 703 pd->handle, pnp_eisaformat(*devid), *devid); 704 if (compid != NULL) 705 printf(" compat ID %s (%08x)", 706 pnp_eisaformat(*compid), *compid); 707 printf("\n"); 708 } 709 } 710 } 711 712 static device_method_t pnpbios_methods[] = { 713 /* Device interface */ 714 DEVMETHOD(device_identify, pnpbios_identify), 715 { 0, 0 } 716 }; 717 718 static driver_t pnpbios_driver = { 719 "pnpbios", 720 pnpbios_methods, 721 1, /* no softc */ 722 }; 723 724 static devclass_t pnpbios_devclass; 725 726 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0); 727 #endif /* DEV_ISA */
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