bios.c revision 61531
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: head/sys/amd64/amd64/bios.c 61531 2000-06-10 22:56:09Z msmith $ 28 */ 29 30/* 31 * Code for dealing with the BIOS in x86 PC systems. 32 */ 33 34#include "isa.h" 35#include "opt_smp.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/kernel.h> 40#include <sys/malloc.h> 41#include <sys/bus.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#include <isa/pnpreg.h> 50#include <isa/pnpvar.h> 51#if NISA > 0 52#include <isa/isavar.h> 53#endif 54 55#define BIOS_START 0xe0000 56#define BIOS_SIZE 0x20000 57 58/* exported lookup results */ 59struct bios32_SDentry PCIbios = {entry : 0}; 60struct PnPBIOS_table *PnPBIOStable = 0; 61 62static u_int bios32_SDCI = 0; 63 64/* start fairly early */ 65static void bios32_init(void *junk); 66SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL); 67 68/* 69 * bios32_init 70 * 71 * Locate various bios32 entities. 72 */ 73static void 74bios32_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) && (sdh->entry < (BIOS_START + BIOS_SIZE))) { 97 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry); 98 if (bootverbose) { 99 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh); 100 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n", 101 sdh->entry, bios32_SDCI, sdh->revision, sdh->len); 102 } 103 104#ifndef PC98 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#endif 114 } else { 115 printf("bios32: Bad BIOS32 Service Directory\n"); 116 } 117 } 118 119 /* 120 * PnP BIOS 121 * 122 * Allow user override of PnP BIOS search 123 */ 124 if ((((p = getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) && 125 ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) { 126 127 /* get a virtual pointer to the structure */ 128 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 129 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) { 130 ck += cv[i]; 131 } 132 /* If checksum is OK, enable use of the entrypoint */ 133 if (ck == 0) { 134 PnPBIOStable = pt; 135 if (bootverbose) { 136 printf("pnpbios: Found PnP BIOS data at %p\n", pt); 137 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n", 138 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf); 139 if ((pt->control & 0x3) == 0x01) 140 printf("pnpbios: Event flag at %x\n", pt->evflagaddr); 141 if (pt->oemdevid != 0) 142 printf("pnpbios: OEM ID %x\n", pt->oemdevid); 143 144 } 145 } else { 146 printf("pnpbios: Bad PnP BIOS data checksum\n"); 147 } 148 } 149 150 if (bootverbose) { 151 /* look for other know signatures */ 152 printf("Other BIOS signatures found:\n"); 153 printf("ACPI: %08x\n", bios_sigsearch(0, "RSD PTR ", 8, 16, 0)); 154 } 155} 156 157/* 158 * bios32_SDlookup 159 * 160 * Query the BIOS32 Service Directory for the service named in (ent), 161 * returns nonzero if the lookup fails. The caller must fill in 162 * (ent->ident), the remainder are populated on a successful lookup. 163 */ 164int 165bios32_SDlookup(struct bios32_SDentry *ent) 166{ 167 struct bios_regs args; 168 169 if (bios32_SDCI == 0) 170 return (1); 171 172 args.eax = ent->ident.id; /* set up arguments */ 173 args.ebx = args.ecx = args.edx = 0; 174 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL)); 175 if ((args.eax & 0xff) == 0) { /* success? */ 176 ent->base = args.ebx; 177 ent->len = args.ecx; 178 ent->entry = args.edx; 179 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry); 180 return (0); /* all OK */ 181 } 182 return (1); /* failed */ 183} 184 185 186/* 187 * bios_sigsearch 188 * 189 * Search some or all of the BIOS region for a signature string. 190 * 191 * (start) Optional offset returned from this function 192 * (for searching for multiple matches), or NULL 193 * to start the search from the base of the BIOS. 194 * Note that this will be a _physical_ address in 195 * the range 0xe0000 - 0xfffff. 196 * (sig) is a pointer to the byte(s) of the signature. 197 * (siglen) number of bytes in the signature. 198 * (paralen) signature paragraph (alignment) size. 199 * (sigofs) offset of the signature within the paragraph. 200 * 201 * Returns the _physical_ address of the found signature, 0 if the 202 * signature was not found. 203 */ 204 205u_int32_t 206bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs) 207{ 208 u_char *sp, *end; 209 210 /* compute the starting address */ 211 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) { 212 sp = (char *)BIOS_PADDRTOVADDR(start); 213 } else if (start == 0) { 214 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START); 215 } else { 216 return 0; /* bogus start address */ 217 } 218 219 /* compute the end address */ 220 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE); 221 222 /* loop searching */ 223 while ((sp + sigofs + siglen) < end) { 224 225 /* compare here */ 226 if (!bcmp(sp + sigofs, sig, siglen)) { 227 /* convert back to physical address */ 228 return((u_int32_t)BIOS_VADDRTOPADDR(sp)); 229 } 230 sp += paralen; 231 } 232 return(0); 233} 234 235/* 236 * do not staticize, used by bioscall.s 237 */ 238union { 239 struct { 240 u_short offset; 241 u_short segment; 242 } vec16; 243 struct { 244 u_int offset; 245 u_short segment; 246 } vec32; 247} bioscall_vector; /* bios jump vector */ 248 249void 250set_bios_selectors(struct bios_segments *seg, int flags) 251{ 252 struct soft_segment_descriptor ssd = { 253 0, /* segment base address (overwritten) */ 254 0, /* length (overwritten) */ 255 SDT_MEMERA, /* segment type (overwritten) */ 256 0, /* priority level */ 257 1, /* descriptor present */ 258 0, 0, 259 1, /* descriptor size (overwritten) */ 260 0 /* granularity == byte units */ 261 }; 262 union descriptor *p_gdt; 263 264#ifdef SMP 265 p_gdt = &gdt[cpuid * NGDT]; 266#else 267 p_gdt = gdt; 268#endif 269 270 ssd.ssd_base = seg->code32.base; 271 ssd.ssd_limit = seg->code32.limit; 272 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd); 273 274 ssd.ssd_def32 = 0; 275 if (flags & BIOSCODE_FLAG) { 276 ssd.ssd_base = seg->code16.base; 277 ssd.ssd_limit = seg->code16.limit; 278 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd); 279 } 280 281 ssd.ssd_type = SDT_MEMRWA; 282 if (flags & BIOSDATA_FLAG) { 283 ssd.ssd_base = seg->data.base; 284 ssd.ssd_limit = seg->data.limit; 285 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd); 286 } 287 288 if (flags & BIOSUTIL_FLAG) { 289 ssd.ssd_base = seg->util.base; 290 ssd.ssd_limit = seg->util.limit; 291 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd); 292 } 293 294 if (flags & BIOSARGS_FLAG) { 295 ssd.ssd_base = seg->args.base; 296 ssd.ssd_limit = seg->args.limit; 297 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd); 298 } 299} 300 301extern int vm86pa; 302extern void bios16_jmp(void); 303 304/* 305 * this routine is really greedy with selectors, and uses 5: 306 * 307 * 32-bit code selector: to return to kernel 308 * 16-bit code selector: for running code 309 * data selector: for 16-bit data 310 * util selector: extra utility selector 311 * args selector: to handle pointers 312 * 313 * the util selector is set from the util16 entry in bios16_args, if a 314 * "U" specifier is seen. 315 * 316 * See <machine/pc/bios.h> for description of format specifiers 317 */ 318int 319bios16(struct bios_args *args, char *fmt, ...) 320{ 321 char *p, *stack, *stack_top; 322 va_list ap; 323 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; 324 u_int i, arg_start, arg_end; 325 u_int *pte, *ptd; 326 327 arg_start = 0xffffffff; 328 arg_end = 0; 329 330 /* 331 * Some BIOS entrypoints attempt to copy the largest-case 332 * argument frame (in order to generalise handling for 333 * different entry types). If our argument frame is 334 * smaller than this, the BIOS will reach off the top of 335 * our constructed stack segment. Pad the top of the stack 336 * with some garbage to avoid this. 337 */ 338 stack = (caddr_t)PAGE_SIZE - 32; 339 340 va_start(ap, fmt); 341 for (p = fmt; p && *p; p++) { 342 switch (*p) { 343 case 'p': /* 32-bit pointer */ 344 i = va_arg(ap, u_int); 345 arg_start = min(arg_start, i); 346 arg_end = max(arg_end, i); 347 flags |= BIOSARGS_FLAG; 348 stack -= 4; 349 break; 350 351 case 'i': /* 32-bit integer */ 352 i = va_arg(ap, u_int); 353 stack -= 4; 354 break; 355 356 case 'U': /* 16-bit selector */ 357 flags |= BIOSUTIL_FLAG; 358 /* FALLTHROUGH */ 359 case 'D': /* 16-bit selector */ 360 case 'C': /* 16-bit selector */ 361 stack -= 2; 362 break; 363 364 case 's': /* 16-bit integer */ 365 i = va_arg(ap, u_short); 366 stack -= 2; 367 break; 368 369 default: 370 return (EINVAL); 371 } 372 } 373 374 if (flags & BIOSARGS_FLAG) { 375 if (arg_end - arg_start > ctob(16)) 376 return (EACCES); 377 args->seg.args.base = arg_start; 378 args->seg.args.limit = 0xffff; 379 } 380 381 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME; 382 args->seg.code32.limit = 0xffff; 383 384 ptd = (u_int *)rcr3(); 385 if (ptd == IdlePTD) { 386 /* 387 * no page table, so create one and install it. 388 */ 389 pte = (u_int *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 390 ptd = (u_int *)((u_int)ptd + KERNBASE); 391 *ptd = vtophys(pte) | PG_RW | PG_V; 392 } else { 393 /* 394 * this is a user-level page table 395 */ 396 pte = (u_int *)&PTmap; 397 } 398 /* 399 * install pointer to page 0. we don't need to flush the tlb, 400 * since there should not be a previous mapping for page 0. 401 */ 402 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; 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 */ 437 i = va_arg(ap, u_short); 438 *(u_short *)stack = i; 439 stack += 2; 440 break; 441 442 default: 443 return (EINVAL); 444 } 445 } 446 447 set_bios_selectors(&args->seg, flags); 448 bioscall_vector.vec16.offset = (u_short)args->entry; 449 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); 450 451 i = bios16_call(&args->r, stack_top); 452 453 if (pte == (u_int *)&PTmap) { 454 *pte = 0; /* remove entry */ 455 } else { 456 *ptd = 0; /* remove page table */ 457 free(pte, M_TEMP); /* ... and free it */ 458 } 459 460 /* 461 * XXX only needs to be invlpg(0) but that doesn't work on the 386 462 */ 463 invltlb(); 464 465 return (i); 466} 467 468/* 469 * PnP BIOS interface; enumerate devices only known to the system 470 * BIOS and save information about them for later use. 471 */ 472 473struct pnp_sysdev 474{ 475 u_int16_t size; 476 u_int8_t handle; 477 u_int32_t devid; 478 u_int8_t type[3]; 479 u_int16_t attrib; 480#define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ 481#define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ 482#define PNPATTR_OUTPUT (1<<2) /* can be primary output */ 483#define PNPATTR_INPUT (1<<3) /* can be primary input */ 484#define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ 485#define PNPATTR_DOCK (1<<5) /* is a docking station */ 486#define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ 487#define PNPATTR_CONFIG_STATIC 0x00 488#define PNPATTR_CONFIG_DYNAMIC 0x07 489#define PNPATTR_CONFIG_DYNONLY 0x17 490 /* device-specific data comes here */ 491 u_int8_t devdata[0]; 492} __attribute__ ((packed)); 493 494/* We have to cluster arguments within a 64k range for the bios16 call */ 495struct pnp_sysdevargs 496{ 497 u_int16_t next; 498 struct pnp_sysdev node; 499}; 500 501/* 502 * This function is called after the bus has assigned resource 503 * locations for a logical device. 504 */ 505static void 506pnpbios_set_config(void *arg, struct isa_config *config, int enable) 507{ 508} 509 510/* 511 * Quiz the PnP BIOS, build a list of PNP IDs and resource data. 512 */ 513static void 514pnpbios_identify(driver_t *driver, device_t parent) 515{ 516 struct PnPBIOS_table *pt = PnPBIOStable; 517 struct bios_args args; 518 struct pnp_sysdev *pd; 519 struct pnp_sysdevargs *pda; 520 u_int16_t ndevs, bigdev; 521 int error, currdev; 522 u_int8_t *devnodebuf, tag; 523 u_int32_t *devid, *compid; 524 int idx, left; 525 device_t dev; 526 527 /* no PnP BIOS information */ 528 if (pt == NULL) 529 return; 530 531 bzero(&args, sizeof(args)); 532 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); 533 args.seg.code16.limit = 0xffff; /* XXX ? */ 534 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); 535 args.seg.data.limit = 0xffff; 536 args.entry = pt->pmentryoffset; 537 538 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) 539 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); 540 ndevs &= 0xff; /* clear high byte garbage */ 541 if (bootverbose) 542 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); 543 544 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), 545 M_DEVBUF, M_NOWAIT); 546 pda = (struct pnp_sysdevargs *)devnodebuf; 547 pd = &pda->node; 548 549 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { 550 551 bzero(pd, bigdev); 552 pda->next = currdev; 553 /* get current configuration */ 554 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, (u_int16_t)1))) { 555 printf("pnpbios: error %d making BIOS16 call\n", error); 556 break; 557 } 558 if ((error = (args.r.eax & 0xff))) { 559 if (bootverbose) 560 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); 561 if (error & 0x80) 562 break; 563 } 564 currdev = pda->next; 565 if (pd->size < sizeof(struct pnp_sysdev)) { 566 printf("pnpbios: bogus system node data, aborting scan\n"); 567 break; 568 } 569 570 /* 571 * If we are in APIC_IO mode, we should ignore the ISA PIC if it 572 * shows up. Likewise, in !APIC_IO mode, we should ignore the 573 * APIC (less important). 574 * This is significant because the ISA PIC will claim IRQ 2 (which 575 * it uses for chaining), while in APIC mode this is a valid IRQ 576 * available for general use. 577 */ 578#ifdef APIC_IO 579 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */ 580 continue; 581#else 582 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */ 583 continue; 584#endif 585 586 /* Add the device and parse its resources */ 587 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 588 isa_set_vendorid(dev, pd->devid); 589 isa_set_logicalid(dev, pd->devid); 590 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0); 591 pnp_parse_resources(dev, &pd->devdata[0], 592 pd->size - sizeof(struct pnp_sysdev)); 593 if (!device_get_desc(dev)) 594 device_set_desc_copy(dev, pnp_eisaformat(pd->devid)); 595 596 /* Find device IDs */ 597 devid = &pd->devid; 598 compid = NULL; 599 600 /* look for a compatible device ID too */ 601 left = pd->size - sizeof(struct pnp_sysdev); 602 idx = 0; 603 while (idx < left) { 604 tag = pd->devdata[idx++]; 605 if (PNP_RES_TYPE(tag) == 0) { 606 /* Small resource */ 607 switch (PNP_SRES_NUM(tag)) { 608 case PNP_TAG_COMPAT_DEVICE: 609 compid = (u_int32_t *)(pd->devdata + idx); 610 if (bootverbose) 611 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); 612 /* FALLTHROUGH */ 613 case PNP_TAG_END: 614 idx = left; 615 break; 616 default: 617 idx += PNP_SRES_LEN(tag); 618 break; 619 } 620 } else 621 /* Large resource, skip it */ 622 idx += *(u_int16_t *)(pd->devdata + idx) + 2; 623 } 624 if (bootverbose) { 625 printf("pnpbios: handle %d device ID %s (%08x)", 626 pd->handle, pnp_eisaformat(*devid), *devid); 627 if (compid != NULL) 628 printf(" compat ID %s (%08x)", 629 pnp_eisaformat(*compid), *compid); 630 printf("\n"); 631 } 632 } 633} 634 635static device_method_t pnpbios_methods[] = { 636 /* Device interface */ 637 DEVMETHOD(device_identify, pnpbios_identify), 638 639 { 0, 0 } 640}; 641 642static driver_t pnpbios_driver = { 643 "pnpbios", 644 pnpbios_methods, 645 1, /* no softc */ 646}; 647 648static devclass_t pnpbios_devclass; 649 650DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0); 651