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 * $FreeBSD$ 28 */ 29 30 /* 31 * Code for dealing with the BIOS in x86 PC systems. 32 */ 33 34 #include "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 <vm/vm.h> 42 #include <vm/pmap.h> 43 #include <machine/globals.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 #include <isa/isavar.h> 50 #include <isa/pnpreg.h> 51 #include <isa/pnpvar.h> 52 53 #define BIOS_START 0xe0000 54 #define BIOS_SIZE 0x20000 55 56 /* exported lookup results */ 57 struct bios32_SDentry PCIbios = {entry : 0}; 58 struct PnPBIOS_table *PnPBIOStable = 0; 59 60 static u_int bios32_SDCI = 0; 61 62 /* start fairly early */ 63 static void bios32_init(void *junk); 64 SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL); 65 66 /* 67 * bios32_init 68 * 69 * Locate various bios32 entities. 70 */ 71 static void 72 bios32_init(void *junk) 73 { 74 u_long sigaddr; 75 struct bios32_SDheader *sdh; 76 struct PnPBIOS_table *pt; 77 u_int8_t ck, *cv; 78 int i; 79 char *p; 80 81 /* 82 * BIOS32 Service Directory, PCI BIOS 83 */ 84 85 /* look for the signature */ 86 if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) { 87 88 /* get a virtual pointer to the structure */ 89 sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 90 for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) { 91 ck += cv[i]; 92 } 93 /* If checksum is OK, enable use of the entrypoint */ 94 if ((ck == 0) && (sdh->entry < (BIOS_START + BIOS_SIZE))) { 95 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry); 96 if (bootverbose) { 97 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh); 98 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n", 99 sdh->entry, bios32_SDCI, sdh->revision, sdh->len); 100 } 101 102 #ifndef PC98 103 /* Allow user override of PCI BIOS search */ 104 if (((p = getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) { 105 106 /* See if there's a PCI BIOS entrypoint here */ 107 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */ 108 if (!bios32_SDlookup(&PCIbios) && bootverbose) 109 printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry); 110 } 111 #endif 112 } else { 113 printf("bios32: Bad BIOS32 Service Directory\n"); 114 } 115 } 116 117 /* 118 * PnP BIOS 119 * 120 * Allow user override of PnP BIOS search 121 */ 122 if ((((p = getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) && 123 ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) { 124 125 /* get a virtual pointer to the structure */ 126 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 127 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) { 128 ck += cv[i]; 129 } 130 /* If checksum is OK, enable use of the entrypoint */ 131 if (ck == 0) { 132 PnPBIOStable = pt; 133 if (bootverbose) { 134 printf("pnpbios: Found PnP BIOS data at %p\n", pt); 135 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n", 136 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf); 137 if ((pt->control & 0x3) == 0x01) 138 printf("pnpbios: Event flag at %x\n", pt->evflagaddr); 139 if (pt->oemdevid != 0) 140 printf("pnpbios: OEM ID %x\n", pt->oemdevid); 141 142 } 143 } else { 144 printf("pnpbios: Bad PnP BIOS data checksum\n"); 145 } 146 } 147 if (bootverbose) { 148 /* look for other know signatures */ 149 printf("Other BIOS signatures found:\n"); 150 } 151 } 152 153 /* 154 * bios32_SDlookup 155 * 156 * Query the BIOS32 Service Directory for the service named in (ent), 157 * returns nonzero if the lookup fails. The caller must fill in 158 * (ent->ident), the remainder are populated on a successful lookup. 159 */ 160 int 161 bios32_SDlookup(struct bios32_SDentry *ent) 162 { 163 struct bios_regs args; 164 165 if (bios32_SDCI == 0) 166 return (1); 167 168 args.eax = ent->ident.id; /* set up arguments */ 169 args.ebx = args.ecx = args.edx = 0; 170 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL)); 171 if ((args.eax & 0xff) == 0) { /* success? */ 172 ent->base = args.ebx; 173 ent->len = args.ecx; 174 ent->entry = args.edx; 175 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry); 176 return (0); /* all OK */ 177 } 178 return (1); /* failed */ 179 } 180 181 182 /* 183 * bios_sigsearch 184 * 185 * Search some or all of the BIOS region for a signature string. 186 * 187 * (start) Optional offset returned from this function 188 * (for searching for multiple matches), or NULL 189 * to start the search from the base of the BIOS. 190 * Note that this will be a _physical_ address in 191 * the range 0xe0000 - 0xfffff. 192 * (sig) is a pointer to the byte(s) of the signature. 193 * (siglen) number of bytes in the signature. 194 * (paralen) signature paragraph (alignment) size. 195 * (sigofs) offset of the signature within the paragraph. 196 * 197 * Returns the _physical_ address of the found signature, 0 if the 198 * signature was not found. 199 */ 200 201 u_int32_t 202 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs) 203 { 204 u_char *sp, *end; 205 206 /* compute the starting address */ 207 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) { 208 sp = (char *)BIOS_PADDRTOVADDR(start); 209 } else if (start == 0) { 210 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START); 211 } else { 212 return 0; /* bogus start address */ 213 } 214 215 /* compute the end address */ 216 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE); 217 218 /* loop searching */ 219 while ((sp + sigofs + siglen) < end) { 220 221 /* compare here */ 222 if (!bcmp(sp + sigofs, sig, siglen)) { 223 /* convert back to physical address */ 224 return((u_int32_t)BIOS_VADDRTOPADDR(sp)); 225 } 226 sp += paralen; 227 } 228 return(0); 229 } 230 231 /* 232 * do not staticize, used by bioscall.s 233 */ 234 union { 235 struct { 236 u_short offset; 237 u_short segment; 238 } vec16; 239 struct { 240 u_int offset; 241 u_short segment; 242 } vec32; 243 } bioscall_vector; /* bios jump vector */ 244 245 void 246 set_bios_selectors(struct bios_segments *seg, int flags) 247 { 248 struct soft_segment_descriptor ssd = { 249 0, /* segment base address (overwritten) */ 250 0, /* length (overwritten) */ 251 SDT_MEMERA, /* segment type (overwritten) */ 252 0, /* priority level */ 253 1, /* descriptor present */ 254 0, 0, 255 1, /* descriptor size (overwritten) */ 256 0 /* granularity == byte units */ 257 }; 258 union descriptor *p_gdt; 259 260 #ifdef SMP 261 p_gdt = &gdt[cpuid * NGDT]; 262 #else 263 p_gdt = gdt; 264 #endif 265 266 ssd.ssd_base = seg->code32.base; 267 ssd.ssd_limit = seg->code32.limit; 268 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd); 269 270 ssd.ssd_def32 = 0; 271 if (flags & BIOSCODE_FLAG) { 272 ssd.ssd_base = seg->code16.base; 273 ssd.ssd_limit = seg->code16.limit; 274 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd); 275 } 276 277 ssd.ssd_type = SDT_MEMRWA; 278 if (flags & BIOSDATA_FLAG) { 279 ssd.ssd_base = seg->data.base; 280 ssd.ssd_limit = seg->data.limit; 281 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd); 282 } 283 284 if (flags & BIOSUTIL_FLAG) { 285 ssd.ssd_base = seg->util.base; 286 ssd.ssd_limit = seg->util.limit; 287 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd); 288 } 289 290 if (flags & BIOSARGS_FLAG) { 291 ssd.ssd_base = seg->args.base; 292 ssd.ssd_limit = seg->args.limit; 293 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd); 294 } 295 } 296 297 extern int vm86pa; 298 extern void bios16_jmp(void); 299 300 /* 301 * this routine is really greedy with selectors, and uses 5: 302 * 303 * 32-bit code selector: to return to kernel 304 * 16-bit code selector: for running code 305 * data selector: for 16-bit data 306 * util selector: extra utility selector 307 * args selector: to handle pointers 308 * 309 * the util selector is set from the util16 entry in bios16_args, if a 310 * "U" specifier is seen. 311 * 312 * See <machine/pc/bios.h> for description of format specifiers 313 */ 314 int 315 bios16(struct bios_args *args, char *fmt, ...) 316 { 317 char *p, *stack, *stack_top; 318 va_list ap; 319 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; 320 u_int i, arg_start, arg_end; 321 u_int *pte, *ptd; 322 323 arg_start = 0xffffffff; 324 arg_end = 0; 325 326 /* 327 * Some BIOS entrypoints attempt to copy the largest-case 328 * argument frame (in order to generalise handling for 329 * different entry types). If our argument frame is 330 * smaller than this, the BIOS will reach off the top of 331 * our constructed stack segment. Pad the top of the stack 332 * with some garbage to avoid this. 333 */ 334 stack = (caddr_t)PAGE_SIZE - 32; 335 336 va_start(ap, fmt); 337 for (p = fmt; p && *p; p++) { 338 switch (*p) { 339 case 'p': /* 32-bit pointer */ 340 i = va_arg(ap, u_int); 341 arg_start = min(arg_start, i); 342 arg_end = max(arg_end, i); 343 flags |= BIOSARGS_FLAG; 344 stack -= 4; 345 break; 346 347 case 'i': /* 32-bit integer */ 348 i = va_arg(ap, u_int); 349 stack -= 4; 350 break; 351 352 case 'U': /* 16-bit selector */ 353 flags |= BIOSUTIL_FLAG; 354 /* FALLTHROUGH */ 355 case 'D': /* 16-bit selector */ 356 case 'C': /* 16-bit selector */ 357 stack -= 2; 358 break; 359 360 case 's': /* 16-bit integer */ 361 i = va_arg(ap, u_short); 362 stack -= 2; 363 break; 364 365 default: 366 return (EINVAL); 367 } 368 } 369 370 if (flags & BIOSARGS_FLAG) { 371 if (arg_end - arg_start > ctob(16)) 372 return (EACCES); 373 args->seg.args.base = arg_start; 374 args->seg.args.limit = 0xffff; 375 } 376 377 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME; 378 args->seg.code32.limit = 0xffff; 379 380 ptd = (u_int *)rcr3(); 381 if (ptd == IdlePTD) { 382 /* 383 * no page table, so create one and install it. 384 */ 385 pte = (u_int *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 386 ptd = (u_int *)((u_int)ptd + KERNBASE); 387 *ptd = vtophys(pte) | PG_RW | PG_V; 388 } else { 389 /* 390 * this is a user-level page table 391 */ 392 pte = (u_int *)&PTmap; 393 } 394 /* 395 * install pointer to page 0. we don't need to flush the tlb, 396 * since there should not be a previous mapping for page 0. 397 */ 398 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; 399 400 stack_top = stack; 401 va_start(ap, fmt); 402 for (p = fmt; p && *p; p++) { 403 switch (*p) { 404 case 'p': /* 32-bit pointer */ 405 i = va_arg(ap, u_int); 406 *(u_int *)stack = (i - arg_start) | 407 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16); 408 stack += 4; 409 break; 410 411 case 'i': /* 32-bit integer */ 412 i = va_arg(ap, u_int); 413 *(u_int *)stack = i; 414 stack += 4; 415 break; 416 417 case 'U': /* 16-bit selector */ 418 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL); 419 stack += 2; 420 break; 421 422 case 'D': /* 16-bit selector */ 423 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL); 424 stack += 2; 425 break; 426 427 case 'C': /* 16-bit selector */ 428 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL); 429 stack += 2; 430 break; 431 432 case 's': /* 16-bit integer */ 433 i = va_arg(ap, u_short); 434 *(u_short *)stack = i; 435 stack += 2; 436 break; 437 438 default: 439 return (EINVAL); 440 } 441 } 442 443 set_bios_selectors(&args->seg, flags); 444 bioscall_vector.vec16.offset = (u_short)args->entry; 445 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); 446 447 i = bios16_call(&args->r, stack_top); 448 449 if (pte == (u_int *)&PTmap) { 450 *pte = 0; /* remove entry */ 451 } else { 452 *ptd = 0; /* remove page table */ 453 free(pte, M_TEMP); /* ... and free it */ 454 } 455 456 /* 457 * XXX only needs to be invlpg(0) but that doesn't work on the 386 458 */ 459 invltlb(); 460 461 return (i); 462 } 463 464 /* 465 * PnP BIOS interface; enumerate devices only known to the system 466 * BIOS and save information about them for later use. 467 */ 468 469 struct pnp_sysdev 470 { 471 u_int16_t size; 472 u_int8_t handle; 473 u_int32_t devid; 474 u_int8_t type[3]; 475 u_int16_t attrib; 476 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ 477 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ 478 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */ 479 #define PNPATTR_INPUT (1<<3) /* can be primary input */ 480 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ 481 #define PNPATTR_DOCK (1<<5) /* is a docking station */ 482 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ 483 #define PNPATTR_CONFIG_STATIC 0x00 484 #define PNPATTR_CONFIG_DYNAMIC 0x07 485 #define PNPATTR_CONFIG_DYNONLY 0x17 486 /* device-specific data comes here */ 487 u_int8_t devdata[0]; 488 } __attribute__ ((packed)); 489 490 /* We have to cluster arguments within a 64k range for the bios16 call */ 491 struct pnp_sysdevargs 492 { 493 u_int16_t next; 494 struct pnp_sysdev node; 495 }; 496 497 /* 498 * This function is called after the bus has assigned resource 499 * locations for a logical device. 500 */ 501 static void 502 pnpbios_set_config(void *arg, struct isa_config *config, int enable) 503 { 504 } 505 506 /* 507 * Quiz the PnP BIOS, build a list of PNP IDs and resource data. 508 */ 509 static void 510 pnpbios_identify(driver_t *driver, device_t parent) 511 { 512 struct PnPBIOS_table *pt = PnPBIOStable; 513 struct bios_args args; 514 struct pnp_sysdev *pd; 515 struct pnp_sysdevargs *pda; 516 u_int16_t ndevs, bigdev; 517 int error, currdev; 518 u_int8_t *devnodebuf, tag; 519 u_int32_t *devid, *compid; 520 int idx, left; 521 device_t dev; 522 523 /* no PnP BIOS information */ 524 if (pt == NULL) 525 return; 526 527 bzero(&args, sizeof(args)); 528 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); 529 args.seg.code16.limit = 0xffff; /* XXX ? */ 530 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); 531 args.seg.data.limit = 0xffff; 532 args.entry = pt->pmentryoffset; 533 534 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) 535 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); 536 ndevs &= 0xff; /* clear high byte garbage */ 537 if (bootverbose) 538 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); 539 540 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), 541 M_DEVBUF, M_NOWAIT); 542 pda = (struct pnp_sysdevargs *)devnodebuf; 543 pd = &pda->node; 544 545 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { 546 547 bzero(pd, bigdev); 548 pda->next = currdev; 549 /* get current configuration */ 550 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, (u_int16_t)1))) { 551 printf("pnpbios: error %d making BIOS16 call\n", error); 552 break; 553 } 554 if ((error = (args.r.eax & 0xff))) { 555 if (bootverbose) 556 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); 557 if (error & 0x80) 558 break; 559 } 560 currdev = pda->next; 561 if (pd->size < sizeof(struct pnp_sysdev)) { 562 printf("pnpbios: bogus system node data, aborting scan\n"); 563 break; 564 } 565 566 /* 567 * If we are in APIC_IO mode, we should ignore the ISA PIC if it 568 * shows up. Likewise, in !APIC_IO mode, we should ignore the 569 * APIC (less important). 570 * This is significant because the ISA PIC will claim IRQ 2 (which 571 * it uses for chaining), while in APIC mode this is a valid IRQ 572 * available for general use. 573 */ 574 #ifdef APIC_IO 575 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */ 576 continue; 577 #else 578 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */ 579 continue; 580 #endif 581 582 /* Add the device and parse its resources */ 583 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 584 isa_set_vendorid(dev, pd->devid); 585 isa_set_logicalid(dev, pd->devid); 586 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0); 587 pnp_parse_resources(dev, &pd->devdata[0], 588 pd->size - sizeof(struct pnp_sysdev), 589 isa_get_vendorid(dev), isa_get_logicalid(dev), 0); 590 if (!device_get_desc(dev)) 591 device_set_desc_copy(dev, pnp_eisaformat(pd->devid)); 592 593 /* Find device IDs */ 594 devid = &pd->devid; 595 compid = NULL; 596 597 /* look for a compatible device ID too */ 598 left = pd->size - sizeof(struct pnp_sysdev); 599 idx = 0; 600 while (idx < left) { 601 tag = pd->devdata[idx++]; 602 if (PNP_RES_TYPE(tag) == 0) { 603 /* Small resource */ 604 switch (PNP_SRES_NUM(tag)) { 605 case PNP_TAG_COMPAT_DEVICE: 606 compid = (u_int32_t *)(pd->devdata + idx); 607 if (bootverbose) 608 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); 609 /* FALLTHROUGH */ 610 case PNP_TAG_END: 611 idx = left; 612 break; 613 default: 614 idx += PNP_SRES_LEN(tag); 615 break; 616 } 617 } else 618 /* Large resource, skip it */ 619 idx += *(u_int16_t *)(pd->devdata + idx) + 2; 620 } 621 if (bootverbose) { 622 printf("pnpbios: handle %d device ID %s (%08x)", 623 pd->handle, pnp_eisaformat(*devid), *devid); 624 if (compid != NULL) 625 printf(" compat ID %s (%08x)", 626 pnp_eisaformat(*compid), *compid); 627 printf("\n"); 628 } 629 } 630 } 631 632 static device_method_t pnpbios_methods[] = { 633 /* Device interface */ 634 DEVMETHOD(device_identify, pnpbios_identify), 635 636 { 0, 0 } 637 }; 638 639 static driver_t pnpbios_driver = { 640 "pnpbios", 641 pnpbios_methods, 642 1, /* no softc */ 643 }; 644 645 static devclass_t pnpbios_devclass; 646 647 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0); 648