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 95 /* get a virtual pointer to the structure */ 96 sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 97 for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) { 98 ck += cv[i]; 99 } 100 /* If checksum is OK, enable use of the entrypoint */ 101 if ((ck == 0) && (BIOS_START <= sdh->entry ) && 102 (sdh->entry < (BIOS_START + BIOS_SIZE))) { 103 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry); 104 if (bootverbose) { 105 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh); 106 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n", 107 sdh->entry, bios32_SDCI, sdh->revision, sdh->len); 108 } 109 110 /* Allow user override of PCI BIOS search */ 111 if (((p = kern_getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) { 112 113 /* See if there's a PCI BIOS entrypoint here */ 114 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */ 115 if (!bios32_SDlookup(&PCIbios) && bootverbose) 116 printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry); 117 } 118 if (p != NULL) 119 freeenv(p); 120 } else { 121 printf("bios32: Bad BIOS32 Service Directory\n"); 122 } 123 } 124 125 /* 126 * PnP BIOS 127 * 128 * Allow user override of PnP BIOS search 129 */ 130 if ((((p = kern_getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) && 131 ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) { 132 133 /* get a virtual pointer to the structure */ 134 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 135 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) { 136 ck += cv[i]; 137 } 138 /* If checksum is OK, enable use of the entrypoint */ 139 if (ck == 0) { 140 PnPBIOStable = pt; 141 if (bootverbose) { 142 printf("pnpbios: Found PnP BIOS data at %p\n", pt); 143 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n", 144 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf); 145 if ((pt->control & 0x3) == 0x01) 146 printf("pnpbios: Event flag at %x\n", pt->evflagaddr); 147 if (pt->oemdevid != 0) 148 printf("pnpbios: OEM ID %x\n", pt->oemdevid); 149 150 } 151 } else { 152 printf("pnpbios: Bad PnP BIOS data checksum\n"); 153 } 154 } 155 if (p != NULL) 156 freeenv(p); 157 if (bootverbose) { 158 /* look for other know signatures */ 159 printf("Other BIOS signatures found:\n"); 160 } 161 } 162 163 /* 164 * bios32_SDlookup 165 * 166 * Query the BIOS32 Service Directory for the service named in (ent), 167 * returns nonzero if the lookup fails. The caller must fill in 168 * (ent->ident), the remainder are populated on a successful lookup. 169 */ 170 int 171 bios32_SDlookup(struct bios32_SDentry *ent) 172 { 173 struct bios_regs args; 174 175 if (bios32_SDCI == 0) 176 return (1); 177 178 args.eax = ent->ident.id; /* set up arguments */ 179 args.ebx = args.ecx = args.edx = 0; 180 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL)); 181 if ((args.eax & 0xff) == 0) { /* success? */ 182 ent->base = args.ebx; 183 ent->len = args.ecx; 184 ent->entry = args.edx; 185 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry); 186 return (0); /* all OK */ 187 } 188 return (1); /* failed */ 189 } 190 191 192 /* 193 * bios_sigsearch 194 * 195 * Search some or all of the BIOS region for a signature string. 196 * 197 * (start) Optional offset returned from this function 198 * (for searching for multiple matches), or NULL 199 * to start the search from the base of the BIOS. 200 * Note that this will be a _physical_ address in 201 * the range 0xe0000 - 0xfffff. 202 * (sig) is a pointer to the byte(s) of the signature. 203 * (siglen) number of bytes in the signature. 204 * (paralen) signature paragraph (alignment) size. 205 * (sigofs) offset of the signature within the paragraph. 206 * 207 * Returns the _physical_ address of the found signature, 0 if the 208 * signature was not found. 209 */ 210 211 u_int32_t 212 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs) 213 { 214 u_char *sp, *end; 215 216 /* compute the starting address */ 217 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) { 218 sp = (char *)BIOS_PADDRTOVADDR(start); 219 } else if (start == 0) { 220 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START); 221 } else { 222 return 0; /* bogus start address */ 223 } 224 225 /* compute the end address */ 226 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE); 227 228 /* loop searching */ 229 while ((sp + sigofs + siglen) < end) { 230 231 /* compare here */ 232 if (!bcmp(sp + sigofs, sig, siglen)) { 233 /* convert back to physical address */ 234 return((u_int32_t)BIOS_VADDRTOPADDR(sp)); 235 } 236 sp += paralen; 237 } 238 return(0); 239 } 240 241 /* 242 * do not staticize, used by bioscall.s 243 */ 244 union { 245 struct { 246 u_short offset; 247 u_short segment; 248 } vec16; 249 struct { 250 u_int offset; 251 u_short segment; 252 } vec32; 253 } bioscall_vector; /* bios jump vector */ 254 255 void 256 set_bios_selectors(struct bios_segments *seg, int flags) 257 { 258 struct soft_segment_descriptor ssd = { 259 0, /* segment base address (overwritten) */ 260 0, /* length (overwritten) */ 261 SDT_MEMERA, /* segment type (overwritten) */ 262 0, /* priority level */ 263 1, /* descriptor present */ 264 0, 0, 265 1, /* descriptor size (overwritten) */ 266 0 /* granularity == byte units */ 267 }; 268 union descriptor *p_gdt; 269 270 #ifdef SMP 271 p_gdt = &gdt[PCPU_GET(cpuid) * NGDT]; 272 #else 273 p_gdt = gdt; 274 #endif 275 276 ssd.ssd_base = seg->code32.base; 277 ssd.ssd_limit = seg->code32.limit; 278 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd); 279 280 ssd.ssd_def32 = 0; 281 if (flags & BIOSCODE_FLAG) { 282 ssd.ssd_base = seg->code16.base; 283 ssd.ssd_limit = seg->code16.limit; 284 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd); 285 } 286 287 ssd.ssd_type = SDT_MEMRWA; 288 if (flags & BIOSDATA_FLAG) { 289 ssd.ssd_base = seg->data.base; 290 ssd.ssd_limit = seg->data.limit; 291 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd); 292 } 293 294 if (flags & BIOSUTIL_FLAG) { 295 ssd.ssd_base = seg->util.base; 296 ssd.ssd_limit = seg->util.limit; 297 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd); 298 } 299 300 if (flags & BIOSARGS_FLAG) { 301 ssd.ssd_base = seg->args.base; 302 ssd.ssd_limit = seg->args.limit; 303 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd); 304 } 305 } 306 307 extern int vm86pa; 308 extern u_long vm86phystk; 309 extern void bios16_jmp(void); 310 311 /* 312 * this routine is really greedy with selectors, and uses 5: 313 * 314 * 32-bit code selector: to return to kernel 315 * 16-bit code selector: for running code 316 * data selector: for 16-bit data 317 * util selector: extra utility selector 318 * args selector: to handle pointers 319 * 320 * the util selector is set from the util16 entry in bios16_args, if a 321 * "U" specifier is seen. 322 * 323 * See <machine/pc/bios.h> for description of format specifiers 324 */ 325 int 326 bios16(struct bios_args *args, char *fmt, ...) 327 { 328 char *p, *stack, *stack_top; 329 va_list ap; 330 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; 331 u_int i, arg_start, arg_end; 332 pt_entry_t *pte; 333 pd_entry_t *ptd, orig_ptd; 334 335 arg_start = 0xffffffff; 336 arg_end = 0; 337 338 /* 339 * Some BIOS entrypoints attempt to copy the largest-case 340 * argument frame (in order to generalise handling for 341 * different entry types). If our argument frame is 342 * smaller than this, the BIOS will reach off the top of 343 * our constructed stack segment. Pad the top of the stack 344 * with some garbage to avoid this. 345 */ 346 stack = (caddr_t)PAGE_SIZE - 32; 347 348 va_start(ap, fmt); 349 for (p = fmt; p && *p; p++) { 350 switch (*p) { 351 case 'p': /* 32-bit pointer */ 352 i = va_arg(ap, u_int); 353 arg_start = min(arg_start, i); 354 arg_end = max(arg_end, i); 355 flags |= BIOSARGS_FLAG; 356 stack -= 4; 357 break; 358 359 case 'i': /* 32-bit integer */ 360 i = va_arg(ap, u_int); 361 stack -= 4; 362 break; 363 364 case 'U': /* 16-bit selector */ 365 flags |= BIOSUTIL_FLAG; 366 /* FALLTHROUGH */ 367 case 'D': /* 16-bit selector */ 368 case 'C': /* 16-bit selector */ 369 stack -= 2; 370 break; 371 372 case 's': /* 16-bit integer passed as an int */ 373 i = va_arg(ap, int); 374 stack -= 2; 375 break; 376 377 default: 378 va_end(ap); 379 return (EINVAL); 380 } 381 } 382 va_end(ap); 383 384 if (flags & BIOSARGS_FLAG) { 385 if (arg_end - arg_start > ctob(16)) 386 return (EACCES); 387 args->seg.args.base = arg_start; 388 args->seg.args.limit = 0xffff; 389 } 390 391 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME; 392 args->seg.code32.limit = 0xffff; 393 394 /* 395 * no page table, so create one and install it. 396 */ 397 pte = (pt_entry_t *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 398 ptd = IdlePTD; 399 *pte = vm86phystk | PG_RW | PG_V; 400 orig_ptd = *ptd; 401 *ptd = vtophys(pte) | PG_RW | PG_V; 402 pmap_invalidate_all(kernel_pmap); /* XXX insurance for now */ 403 404 stack_top = stack; 405 va_start(ap, fmt); 406 for (p = fmt; p && *p; p++) { 407 switch (*p) { 408 case 'p': /* 32-bit pointer */ 409 i = va_arg(ap, u_int); 410 *(u_int *)stack = (i - arg_start) | 411 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16); 412 stack += 4; 413 break; 414 415 case 'i': /* 32-bit integer */ 416 i = va_arg(ap, u_int); 417 *(u_int *)stack = i; 418 stack += 4; 419 break; 420 421 case 'U': /* 16-bit selector */ 422 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL); 423 stack += 2; 424 break; 425 426 case 'D': /* 16-bit selector */ 427 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL); 428 stack += 2; 429 break; 430 431 case 'C': /* 16-bit selector */ 432 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL); 433 stack += 2; 434 break; 435 436 case 's': /* 16-bit integer passed as an int */ 437 i = va_arg(ap, int); 438 *(u_short *)stack = i; 439 stack += 2; 440 break; 441 442 default: 443 va_end(ap); 444 return (EINVAL); 445 } 446 } 447 va_end(ap); 448 449 set_bios_selectors(&args->seg, flags); 450 bioscall_vector.vec16.offset = (u_short)args->entry; 451 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); 452 453 i = bios16_call(&args->r, stack_top); 454 455 *ptd = orig_ptd; /* remove page table */ 456 /* 457 * XXX only needs to be invlpg(0) but that doesn't work on the 386 458 */ 459 pmap_invalidate_all(kernel_pmap); 460 free(pte, M_TEMP); /* ... and free it */ 461 return (i); 462 } 463 464 int 465 bios_oem_strings(struct bios_oem *oem, u_char *buffer, size_t maxlen) 466 { 467 size_t idx = 0; 468 struct bios_oem_signature *sig; 469 u_int from, to; 470 u_char c, *s, *se, *str, *bios_str; 471 size_t i, off, len, tot; 472 473 if ( !oem || !buffer || maxlen<2 ) 474 return(-1); 475 476 sig = oem->signature; 477 if (!sig) 478 return(-2); 479 480 from = oem->range.from; 481 to = oem->range.to; 482 if ( (to<=from) || (from<BIOS_START) || (to>(BIOS_START+BIOS_SIZE)) ) 483 return(-3); 484 485 while (sig->anchor != NULL) { 486 str = sig->anchor; 487 len = strlen(str); 488 off = sig->offset; 489 tot = sig->totlen; 490 /* make sure offset doesn't go beyond bios area */ 491 if ( (to+off)>(BIOS_START+BIOS_SIZE) || 492 ((from+off)<BIOS_START) ) { 493 printf("sys/i386/i386/bios.c: sig '%s' " 494 "from 0x%0x to 0x%0x offset %d " 495 "out of BIOS bounds 0x%0x - 0x%0x\n", 496 str, from, to, off, 497 BIOS_START, BIOS_START+BIOS_SIZE); 498 return(-4); 499 } 500 /* make sure we don't overrun return buffer */ 501 if (idx + tot > maxlen - 1) { 502 printf("sys/i386/i386/bios.c: sig '%s' " 503 "idx %d + tot %d = %d > maxlen-1 %d\n", 504 str, idx, tot, idx+tot, maxlen-1); 505 return(-5); 506 } 507 bios_str = NULL; 508 s = (u_char *)BIOS_PADDRTOVADDR(from); 509 se = (u_char *)BIOS_PADDRTOVADDR(to-len); 510 for (; s<se; s++) { 511 if (!bcmp(str, s, len)) { 512 bios_str = s; 513 break; 514 } 515 } 516 /* 517 * store pretty version of totlen bytes of bios string with 518 * given offset; 0x20 - 0x7E are printable; uniquify spaces 519 */ 520 if (bios_str) { 521 for (i=0; i<tot; i++) { 522 c = bios_str[i+off]; 523 if ( (c < 0x20) || (c > 0x7E) ) 524 c = ' '; 525 if (idx == 0) { 526 if (c != ' ') 527 buffer[idx++] = c; 528 } else if ( (c != ' ') || 529 ((c == ' ') && (buffer[idx-1] != ' ')) ) 530 buffer[idx++] = c; 531 } 532 } 533 sig++; 534 } 535 /* remove a final trailing space */ 536 if ( (idx > 1) && (buffer[idx-1] == ' ') ) 537 idx--; 538 buffer[idx] = '\0'; 539 return (idx); 540 } 541 542 #ifdef DEV_ISA 543 /* 544 * PnP BIOS interface; enumerate devices only known to the system 545 * BIOS and save information about them for later use. 546 */ 547 548 struct pnp_sysdev 549 { 550 u_int16_t size; 551 u_int8_t handle; 552 u_int32_t devid; 553 u_int8_t type[3]; 554 u_int16_t attrib; 555 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ 556 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ 557 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */ 558 #define PNPATTR_INPUT (1<<3) /* can be primary input */ 559 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ 560 #define PNPATTR_DOCK (1<<5) /* is a docking station */ 561 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ 562 #define PNPATTR_CONFIG_STATIC (0) 563 #define PNPATTR_CONFIG_DYNAMIC (1) 564 #define PNPATTR_CONFIG_DYNONLY (3) 565 #define PNPATTR_CONFIG(a) (((a) >> 7) & 0x3) 566 /* device-specific data comes here */ 567 u_int8_t devdata[0]; 568 } __packed; 569 570 /* We have to cluster arguments within a 64k range for the bios16 call */ 571 struct pnp_sysdevargs 572 { 573 u_int16_t next; 574 struct pnp_sysdev node; 575 }; 576 577 /* 578 * This function is called after the bus has assigned resource 579 * locations for a logical device. 580 */ 581 static void 582 pnpbios_set_config(void *arg, struct isa_config *config, int enable) 583 { 584 } 585 586 /* 587 * Quiz the PnP BIOS, build a list of PNP IDs and resource data. 588 */ 589 static void 590 pnpbios_identify(driver_t *driver, device_t parent) 591 { 592 struct PnPBIOS_table *pt = PnPBIOStable; 593 struct bios_args args; 594 struct pnp_sysdev *pd; 595 struct pnp_sysdevargs *pda; 596 u_int16_t ndevs, bigdev; 597 int error, currdev; 598 u_int8_t *devnodebuf, tag; 599 u_int32_t *devid, *compid; 600 int idx, left; 601 device_t dev; 602 603 /* no PnP BIOS information */ 604 if (pt == NULL) 605 return; 606 607 /* Check to see if ACPI is already active. */ 608 dev = devclass_get_device(devclass_find("acpi"), 0); 609 if (dev != NULL && device_is_attached(dev)) 610 return; 611 612 /* get count of PnP devices */ 613 bzero(&args, sizeof(args)); 614 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); 615 args.seg.code16.limit = 0xffff; /* XXX ? */ 616 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); 617 args.seg.data.limit = 0xffff; 618 args.entry = pt->pmentryoffset; 619 620 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) { 621 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); 622 return; 623 } 624 ndevs &= 0xff; /* clear high byte garbage */ 625 if (bootverbose) 626 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); 627 628 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), 629 M_DEVBUF, M_NOWAIT); 630 if (devnodebuf == NULL) { 631 printf("pnpbios: cannot allocate memory, bailing\n"); 632 return; 633 } 634 pda = (struct pnp_sysdevargs *)devnodebuf; 635 pd = &pda->node; 636 637 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { 638 639 bzero(pd, bigdev); 640 pda->next = currdev; 641 /* get current configuration */ 642 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, 1))) { 643 printf("pnpbios: error %d making BIOS16 call\n", error); 644 break; 645 } 646 if ((error = (args.r.eax & 0xff))) { 647 if (bootverbose) 648 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); 649 if (error & 0x80) 650 break; 651 } 652 currdev = pda->next; 653 if (pd->size < sizeof(struct pnp_sysdev)) { 654 printf("pnpbios: bogus system node data, aborting scan\n"); 655 break; 656 } 657 658 /* 659 * Ignore PICs so that we don't have to worry about the PICs 660 * claiming IRQs to prevent their use. The PIC drivers 661 * already ensure that invalid IRQs are not used. 662 */ 663 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */ 664 continue; 665 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */ 666 continue; 667 668 /* Add the device and parse its resources */ 669 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNPBIOS, NULL, -1); 670 isa_set_vendorid(dev, pd->devid); 671 isa_set_logicalid(dev, pd->devid); 672 /* 673 * It appears that some PnP BIOS doesn't allow us to re-enable 674 * the embedded system device once it is disabled. We shall 675 * mark all system device nodes as "cannot be disabled", regardless 676 * of actual settings in the device attribute byte. 677 * XXX 678 isa_set_configattr(dev, 679 ((pd->attrib & PNPATTR_NODISABLE) ? 0 : ISACFGATTR_CANDISABLE) | 680 ((!(pd->attrib & PNPATTR_NOCONFIG) && 681 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC) 682 ? ISACFGATTR_DYNAMIC : 0)); 683 */ 684 isa_set_configattr(dev, 685 (!(pd->attrib & PNPATTR_NOCONFIG) && 686 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC) 687 ? ISACFGATTR_DYNAMIC : 0); 688 isa_set_pnpbios_handle(dev, pd->handle); 689 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0); 690 pnp_parse_resources(dev, &pd->devdata[0], 691 pd->size - sizeof(struct pnp_sysdev), 0); 692 if (!device_get_desc(dev)) 693 device_set_desc_copy(dev, pnp_eisaformat(pd->devid)); 694 695 /* Find device IDs */ 696 devid = &pd->devid; 697 compid = NULL; 698 699 /* look for a compatible device ID too */ 700 left = pd->size - sizeof(struct pnp_sysdev); 701 idx = 0; 702 while (idx < left) { 703 tag = pd->devdata[idx++]; 704 if (PNP_RES_TYPE(tag) == 0) { 705 /* Small resource */ 706 switch (PNP_SRES_NUM(tag)) { 707 case PNP_TAG_COMPAT_DEVICE: 708 compid = (u_int32_t *)(pd->devdata + idx); 709 if (bootverbose) 710 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); 711 /* FALLTHROUGH */ 712 case PNP_TAG_END: 713 idx = left; 714 break; 715 default: 716 idx += PNP_SRES_LEN(tag); 717 break; 718 } 719 } else 720 /* Large resource, skip it */ 721 idx += *(u_int16_t *)(pd->devdata + idx) + 2; 722 } 723 if (bootverbose) { 724 printf("pnpbios: handle %d device ID %s (%08x)", 725 pd->handle, pnp_eisaformat(*devid), *devid); 726 if (compid != NULL) 727 printf(" compat ID %s (%08x)", 728 pnp_eisaformat(*compid), *compid); 729 printf("\n"); 730 } 731 } 732 } 733 734 static device_method_t pnpbios_methods[] = { 735 /* Device interface */ 736 DEVMETHOD(device_identify, pnpbios_identify), 737 738 { 0, 0 } 739 }; 740 741 static driver_t pnpbios_driver = { 742 "pnpbios", 743 pnpbios_methods, 744 1, /* no softc */ 745 }; 746 747 static devclass_t pnpbios_devclass; 748 749 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0); 750 #endif /* DEV_ISA */ 751