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 void bios16_jmp(void); 309 310 /* 311 * this routine is really greedy with selectors, and uses 5: 312 * 313 * 32-bit code selector: to return to kernel 314 * 16-bit code selector: for running code 315 * data selector: for 16-bit data 316 * util selector: extra utility selector 317 * args selector: to handle pointers 318 * 319 * the util selector is set from the util16 entry in bios16_args, if a 320 * "U" specifier is seen. 321 * 322 * See <machine/pc/bios.h> for description of format specifiers 323 */ 324 int 325 bios16(struct bios_args *args, char *fmt, ...) 326 { 327 char *p, *stack, *stack_top; 328 va_list ap; 329 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; 330 u_int i, arg_start, arg_end; 331 pt_entry_t *pte; 332 pd_entry_t *ptd; 333 334 arg_start = 0xffffffff; 335 arg_end = 0; 336 337 /* 338 * Some BIOS entrypoints attempt to copy the largest-case 339 * argument frame (in order to generalise handling for 340 * different entry types). If our argument frame is 341 * smaller than this, the BIOS will reach off the top of 342 * our constructed stack segment. Pad the top of the stack 343 * with some garbage to avoid this. 344 */ 345 stack = (caddr_t)PAGE_SIZE - 32; 346 347 va_start(ap, fmt); 348 for (p = fmt; p && *p; p++) { 349 switch (*p) { 350 case 'p': /* 32-bit pointer */ 351 i = va_arg(ap, u_int); 352 arg_start = min(arg_start, i); 353 arg_end = max(arg_end, i); 354 flags |= BIOSARGS_FLAG; 355 stack -= 4; 356 break; 357 358 case 'i': /* 32-bit integer */ 359 i = va_arg(ap, u_int); 360 stack -= 4; 361 break; 362 363 case 'U': /* 16-bit selector */ 364 flags |= BIOSUTIL_FLAG; 365 /* FALLTHROUGH */ 366 case 'D': /* 16-bit selector */ 367 case 'C': /* 16-bit selector */ 368 stack -= 2; 369 break; 370 371 case 's': /* 16-bit integer passed as an int */ 372 i = va_arg(ap, int); 373 stack -= 2; 374 break; 375 376 default: 377 va_end(ap); 378 return (EINVAL); 379 } 380 } 381 va_end(ap); 382 383 if (flags & BIOSARGS_FLAG) { 384 if (arg_end - arg_start > ctob(16)) 385 return (EACCES); 386 args->seg.args.base = arg_start; 387 args->seg.args.limit = 0xffff; 388 } 389 390 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME; 391 args->seg.code32.limit = 0xffff; 392 393 ptd = (pd_entry_t *)rcr3(); 394 #if defined(PAE) || defined(PAE_TABLES) 395 if (ptd == IdlePDPT) 396 #else 397 if (ptd == IdlePTD) 398 #endif 399 { 400 /* 401 * no page table, so create one and install it. 402 */ 403 pte = (pt_entry_t *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 404 ptd = (pd_entry_t *)((u_int)IdlePTD + KERNBASE); 405 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; 406 *ptd = vtophys(pte) | PG_RW | PG_V; 407 } else { 408 /* 409 * this is a user-level page table 410 */ 411 pte = PTmap; 412 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; 413 } 414 pmap_invalidate_all(kernel_pmap); /* XXX insurance for now */ 415 416 stack_top = stack; 417 va_start(ap, fmt); 418 for (p = fmt; p && *p; p++) { 419 switch (*p) { 420 case 'p': /* 32-bit pointer */ 421 i = va_arg(ap, u_int); 422 *(u_int *)stack = (i - arg_start) | 423 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16); 424 stack += 4; 425 break; 426 427 case 'i': /* 32-bit integer */ 428 i = va_arg(ap, u_int); 429 *(u_int *)stack = i; 430 stack += 4; 431 break; 432 433 case 'U': /* 16-bit selector */ 434 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL); 435 stack += 2; 436 break; 437 438 case 'D': /* 16-bit selector */ 439 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL); 440 stack += 2; 441 break; 442 443 case 'C': /* 16-bit selector */ 444 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL); 445 stack += 2; 446 break; 447 448 case 's': /* 16-bit integer passed as an int */ 449 i = va_arg(ap, int); 450 *(u_short *)stack = i; 451 stack += 2; 452 break; 453 454 default: 455 va_end(ap); 456 return (EINVAL); 457 } 458 } 459 va_end(ap); 460 461 set_bios_selectors(&args->seg, flags); 462 bioscall_vector.vec16.offset = (u_short)args->entry; 463 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); 464 465 i = bios16_call(&args->r, stack_top); 466 467 if (pte == PTmap) { 468 *pte = 0; /* remove entry */ 469 /* 470 * XXX only needs to be invlpg(0) but that doesn't work on the 386 471 */ 472 pmap_invalidate_all(kernel_pmap); 473 } else { 474 *ptd = 0; /* remove page table */ 475 /* 476 * XXX only needs to be invlpg(0) but that doesn't work on the 386 477 */ 478 pmap_invalidate_all(kernel_pmap); 479 free(pte, M_TEMP); /* ... and free it */ 480 } 481 return (i); 482 } 483 484 int 485 bios_oem_strings(struct bios_oem *oem, u_char *buffer, size_t maxlen) 486 { 487 size_t idx = 0; 488 struct bios_oem_signature *sig; 489 u_int from, to; 490 u_char c, *s, *se, *str, *bios_str; 491 size_t i, off, len, tot; 492 493 if ( !oem || !buffer || maxlen<2 ) 494 return(-1); 495 496 sig = oem->signature; 497 if (!sig) 498 return(-2); 499 500 from = oem->range.from; 501 to = oem->range.to; 502 if ( (to<=from) || (from<BIOS_START) || (to>(BIOS_START+BIOS_SIZE)) ) 503 return(-3); 504 505 while (sig->anchor != NULL) { 506 str = sig->anchor; 507 len = strlen(str); 508 off = sig->offset; 509 tot = sig->totlen; 510 /* make sure offset doesn't go beyond bios area */ 511 if ( (to+off)>(BIOS_START+BIOS_SIZE) || 512 ((from+off)<BIOS_START) ) { 513 printf("sys/i386/i386/bios.c: sig '%s' " 514 "from 0x%0x to 0x%0x offset %d " 515 "out of BIOS bounds 0x%0x - 0x%0x\n", 516 str, from, to, off, 517 BIOS_START, BIOS_START+BIOS_SIZE); 518 return(-4); 519 } 520 /* make sure we don't overrun return buffer */ 521 if (idx + tot > maxlen - 1) { 522 printf("sys/i386/i386/bios.c: sig '%s' " 523 "idx %d + tot %d = %d > maxlen-1 %d\n", 524 str, idx, tot, idx+tot, maxlen-1); 525 return(-5); 526 } 527 bios_str = NULL; 528 s = (u_char *)BIOS_PADDRTOVADDR(from); 529 se = (u_char *)BIOS_PADDRTOVADDR(to-len); 530 for (; s<se; s++) { 531 if (!bcmp(str, s, len)) { 532 bios_str = s; 533 break; 534 } 535 } 536 /* 537 * store pretty version of totlen bytes of bios string with 538 * given offset; 0x20 - 0x7E are printable; uniquify spaces 539 */ 540 if (bios_str) { 541 for (i=0; i<tot; i++) { 542 c = bios_str[i+off]; 543 if ( (c < 0x20) || (c > 0x7E) ) 544 c = ' '; 545 if (idx == 0) { 546 if (c != ' ') 547 buffer[idx++] = c; 548 } else if ( (c != ' ') || 549 ((c == ' ') && (buffer[idx-1] != ' ')) ) 550 buffer[idx++] = c; 551 } 552 } 553 sig++; 554 } 555 /* remove a final trailing space */ 556 if ( (idx > 1) && (buffer[idx-1] == ' ') ) 557 idx--; 558 buffer[idx] = '\0'; 559 return (idx); 560 } 561 562 #ifdef DEV_ISA 563 /* 564 * PnP BIOS interface; enumerate devices only known to the system 565 * BIOS and save information about them for later use. 566 */ 567 568 struct pnp_sysdev 569 { 570 u_int16_t size; 571 u_int8_t handle; 572 u_int32_t devid; 573 u_int8_t type[3]; 574 u_int16_t attrib; 575 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ 576 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ 577 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */ 578 #define PNPATTR_INPUT (1<<3) /* can be primary input */ 579 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ 580 #define PNPATTR_DOCK (1<<5) /* is a docking station */ 581 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ 582 #define PNPATTR_CONFIG_STATIC (0) 583 #define PNPATTR_CONFIG_DYNAMIC (1) 584 #define PNPATTR_CONFIG_DYNONLY (3) 585 #define PNPATTR_CONFIG(a) (((a) >> 7) & 0x3) 586 /* device-specific data comes here */ 587 u_int8_t devdata[0]; 588 } __packed; 589 590 /* We have to cluster arguments within a 64k range for the bios16 call */ 591 struct pnp_sysdevargs 592 { 593 u_int16_t next; 594 struct pnp_sysdev node; 595 }; 596 597 /* 598 * This function is called after the bus has assigned resource 599 * locations for a logical device. 600 */ 601 static void 602 pnpbios_set_config(void *arg, struct isa_config *config, int enable) 603 { 604 } 605 606 /* 607 * Quiz the PnP BIOS, build a list of PNP IDs and resource data. 608 */ 609 static void 610 pnpbios_identify(driver_t *driver, device_t parent) 611 { 612 struct PnPBIOS_table *pt = PnPBIOStable; 613 struct bios_args args; 614 struct pnp_sysdev *pd; 615 struct pnp_sysdevargs *pda; 616 u_int16_t ndevs, bigdev; 617 int error, currdev; 618 u_int8_t *devnodebuf, tag; 619 u_int32_t *devid, *compid; 620 int idx, left; 621 device_t dev; 622 623 /* no PnP BIOS information */ 624 if (pt == NULL) 625 return; 626 627 /* Check to see if ACPI is already active. */ 628 dev = devclass_get_device(devclass_find("acpi"), 0); 629 if (dev != NULL && device_is_attached(dev)) 630 return; 631 632 /* get count of PnP devices */ 633 bzero(&args, sizeof(args)); 634 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); 635 args.seg.code16.limit = 0xffff; /* XXX ? */ 636 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); 637 args.seg.data.limit = 0xffff; 638 args.entry = pt->pmentryoffset; 639 640 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) { 641 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); 642 return; 643 } 644 ndevs &= 0xff; /* clear high byte garbage */ 645 if (bootverbose) 646 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); 647 648 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), 649 M_DEVBUF, M_NOWAIT); 650 if (devnodebuf == NULL) { 651 printf("pnpbios: cannot allocate memory, bailing\n"); 652 return; 653 } 654 pda = (struct pnp_sysdevargs *)devnodebuf; 655 pd = &pda->node; 656 657 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { 658 659 bzero(pd, bigdev); 660 pda->next = currdev; 661 /* get current configuration */ 662 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, 1))) { 663 printf("pnpbios: error %d making BIOS16 call\n", error); 664 break; 665 } 666 if ((error = (args.r.eax & 0xff))) { 667 if (bootverbose) 668 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); 669 if (error & 0x80) 670 break; 671 } 672 currdev = pda->next; 673 if (pd->size < sizeof(struct pnp_sysdev)) { 674 printf("pnpbios: bogus system node data, aborting scan\n"); 675 break; 676 } 677 678 /* 679 * Ignore PICs so that we don't have to worry about the PICs 680 * claiming IRQs to prevent their use. The PIC drivers 681 * already ensure that invalid IRQs are not used. 682 */ 683 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */ 684 continue; 685 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */ 686 continue; 687 688 /* Add the device and parse its resources */ 689 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNPBIOS, NULL, -1); 690 isa_set_vendorid(dev, pd->devid); 691 isa_set_logicalid(dev, pd->devid); 692 /* 693 * It appears that some PnP BIOS doesn't allow us to re-enable 694 * the embedded system device once it is disabled. We shall 695 * mark all system device nodes as "cannot be disabled", regardless 696 * of actual settings in the device attribute byte. 697 * XXX 698 isa_set_configattr(dev, 699 ((pd->attrib & PNPATTR_NODISABLE) ? 0 : ISACFGATTR_CANDISABLE) | 700 ((!(pd->attrib & PNPATTR_NOCONFIG) && 701 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC) 702 ? ISACFGATTR_DYNAMIC : 0)); 703 */ 704 isa_set_configattr(dev, 705 (!(pd->attrib & PNPATTR_NOCONFIG) && 706 PNPATTR_CONFIG(pd->attrib) != PNPATTR_CONFIG_STATIC) 707 ? ISACFGATTR_DYNAMIC : 0); 708 isa_set_pnpbios_handle(dev, pd->handle); 709 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0); 710 pnp_parse_resources(dev, &pd->devdata[0], 711 pd->size - sizeof(struct pnp_sysdev), 0); 712 if (!device_get_desc(dev)) 713 device_set_desc_copy(dev, pnp_eisaformat(pd->devid)); 714 715 /* Find device IDs */ 716 devid = &pd->devid; 717 compid = NULL; 718 719 /* look for a compatible device ID too */ 720 left = pd->size - sizeof(struct pnp_sysdev); 721 idx = 0; 722 while (idx < left) { 723 tag = pd->devdata[idx++]; 724 if (PNP_RES_TYPE(tag) == 0) { 725 /* Small resource */ 726 switch (PNP_SRES_NUM(tag)) { 727 case PNP_TAG_COMPAT_DEVICE: 728 compid = (u_int32_t *)(pd->devdata + idx); 729 if (bootverbose) 730 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); 731 /* FALLTHROUGH */ 732 case PNP_TAG_END: 733 idx = left; 734 break; 735 default: 736 idx += PNP_SRES_LEN(tag); 737 break; 738 } 739 } else 740 /* Large resource, skip it */ 741 idx += *(u_int16_t *)(pd->devdata + idx) + 2; 742 } 743 if (bootverbose) { 744 printf("pnpbios: handle %d device ID %s (%08x)", 745 pd->handle, pnp_eisaformat(*devid), *devid); 746 if (compid != NULL) 747 printf(" compat ID %s (%08x)", 748 pnp_eisaformat(*compid), *compid); 749 printf("\n"); 750 } 751 } 752 } 753 754 static device_method_t pnpbios_methods[] = { 755 /* Device interface */ 756 DEVMETHOD(device_identify, pnpbios_identify), 757 758 { 0, 0 } 759 }; 760 761 static driver_t pnpbios_driver = { 762 "pnpbios", 763 pnpbios_methods, 764 1, /* no softc */ 765 }; 766 767 static devclass_t pnpbios_devclass; 768 769 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0); 770 #endif /* DEV_ISA */ 771