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 <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/bus.h> 39 #include <vm/vm.h> 40 #include <vm/pmap.h> 41 #include <machine/globals.h> 42 #include <machine/md_var.h> 43 #include <machine/segments.h> 44 #include <machine/stdarg.h> 45 #include <machine/vmparam.h> 46 #include <machine/pc/bios.h> 47 #include <isa/isavar.h> 48 #include <isa/pnpreg.h> 49 #include <isa/pnpvar.h> 50 51 #define BIOS_START 0xe0000 52 #define BIOS_SIZE 0x20000 53 54 /* exported lookup results */ 55 struct bios32_SDentry PCIbios = {entry : 0}; 56 struct PnPBIOS_table *PnPBIOStable = 0; 57 58 static u_int bios32_SDCI = 0; 59 60 /* start fairly early */ 61 static void bios32_init(void *junk); 62 SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL); 63 64 /* 65 * bios32_init 66 * 67 * Locate various bios32 entities. 68 */ 69 static void 70 bios32_init(void *junk) 71 { 72 u_long sigaddr; 73 struct bios32_SDheader *sdh; 74 struct PnPBIOS_table *pt; 75 u_int8_t ck, *cv; 76 int i; 77 char *p; 78 79 /* 80 * BIOS32 Service Directory, PCI BIOS 81 */ 82 83 /* look for the signature */ 84 if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) { 85 86 /* get a virtual pointer to the structure */ 87 sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 88 for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) { 89 ck += cv[i]; 90 } 91 /* If checksum is OK, enable use of the entrypoint */ 92 if ((ck == 0) && (sdh->entry < (BIOS_START + BIOS_SIZE))) { 93 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry); 94 if (bootverbose) { 95 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh); 96 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n", 97 sdh->entry, bios32_SDCI, sdh->revision, sdh->len); 98 } 99 100 #ifndef PC98 101 /* Allow user override of PCI BIOS search */ 102 if (((p = getenv("machdep.bios.pci")) == NULL) || strcmp(p, "disable")) { 103 104 /* See if there's a PCI BIOS entrypoint here */ 105 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */ 106 if (!bios32_SDlookup(&PCIbios) && bootverbose) 107 printf("pcibios: PCI BIOS entry at 0x%x+0x%x\n", PCIbios.base, PCIbios.entry); 108 } 109 #endif 110 } else { 111 printf("bios32: Bad BIOS32 Service Directory\n"); 112 } 113 } 114 115 /* 116 * PnP BIOS 117 * 118 * Allow user override of PnP BIOS search 119 */ 120 if ((((p = getenv("machdep.bios.pnp")) == NULL) || strcmp(p, "disable")) && 121 ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0)) { 122 123 /* get a virtual pointer to the structure */ 124 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 125 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) { 126 ck += cv[i]; 127 } 128 /* If checksum is OK, enable use of the entrypoint */ 129 if (ck == 0) { 130 PnPBIOStable = pt; 131 if (bootverbose) { 132 printf("pnpbios: Found PnP BIOS data at %p\n", pt); 133 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n", 134 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf); 135 if ((pt->control & 0x3) == 0x01) 136 printf("pnpbios: Event flag at %x\n", pt->evflagaddr); 137 if (pt->oemdevid != 0) 138 printf("pnpbios: OEM ID %x\n", pt->oemdevid); 139 140 } 141 } else { 142 printf("pnpbios: Bad PnP BIOS data checksum\n"); 143 } 144 } 145 if (bootverbose) { 146 /* look for other know signatures */ 147 printf("Other BIOS signatures found:\n"); 148 } 149 } 150 151 /* 152 * bios32_SDlookup 153 * 154 * Query the BIOS32 Service Directory for the service named in (ent), 155 * returns nonzero if the lookup fails. The caller must fill in 156 * (ent->ident), the remainder are populated on a successful lookup. 157 */ 158 int 159 bios32_SDlookup(struct bios32_SDentry *ent) 160 { 161 struct bios_regs args; 162 163 if (bios32_SDCI == 0) 164 return (1); 165 166 args.eax = ent->ident.id; /* set up arguments */ 167 args.ebx = args.ecx = args.edx = 0; 168 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL)); 169 if ((args.eax & 0xff) == 0) { /* success? */ 170 ent->base = args.ebx; 171 ent->len = args.ecx; 172 ent->entry = args.edx; 173 ent->ventry = BIOS_PADDRTOVADDR(ent->base + ent->entry); 174 return (0); /* all OK */ 175 } 176 return (1); /* failed */ 177 } 178 179 180 /* 181 * bios_sigsearch 182 * 183 * Search some or all of the BIOS region for a signature string. 184 * 185 * (start) Optional offset returned from this function 186 * (for searching for multiple matches), or NULL 187 * to start the search from the base of the BIOS. 188 * Note that this will be a _physical_ address in 189 * the range 0xe0000 - 0xfffff. 190 * (sig) is a pointer to the byte(s) of the signature. 191 * (siglen) number of bytes in the signature. 192 * (paralen) signature paragraph (alignment) size. 193 * (sigofs) offset of the signature within the paragraph. 194 * 195 * Returns the _physical_ address of the found signature, 0 if the 196 * signature was not found. 197 */ 198 199 u_int32_t 200 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs) 201 { 202 u_char *sp, *end; 203 204 /* compute the starting address */ 205 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) { 206 sp = (char *)BIOS_PADDRTOVADDR(start); 207 } else if (start == 0) { 208 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START); 209 } else { 210 return 0; /* bogus start address */ 211 } 212 213 /* compute the end address */ 214 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE); 215 216 /* loop searching */ 217 while ((sp + sigofs + siglen) < end) { 218 219 /* compare here */ 220 if (!bcmp(sp + sigofs, sig, siglen)) { 221 /* convert back to physical address */ 222 return((u_int32_t)BIOS_VADDRTOPADDR(sp)); 223 } 224 sp += paralen; 225 } 226 return(0); 227 } 228 229 /* 230 * do not staticize, used by bioscall.s 231 */ 232 union { 233 struct { 234 u_short offset; 235 u_short segment; 236 } vec16; 237 struct { 238 u_int offset; 239 u_short segment; 240 } vec32; 241 } bioscall_vector; /* bios jump vector */ 242 243 void 244 set_bios_selectors(struct bios_segments *seg, int flags) 245 { 246 struct soft_segment_descriptor ssd = { 247 0, /* segment base address (overwritten) */ 248 0, /* length (overwritten) */ 249 SDT_MEMERA, /* segment type (overwritten) */ 250 0, /* priority level */ 251 1, /* descriptor present */ 252 0, 0, 253 1, /* descriptor size (overwritten) */ 254 0 /* granularity == byte units */ 255 }; 256 union descriptor *p_gdt; 257 258 #ifdef SMP 259 p_gdt = &gdt[PCPU_GET(cpuid) * NGDT]; 260 #else 261 p_gdt = gdt; 262 #endif 263 264 ssd.ssd_base = seg->code32.base; 265 ssd.ssd_limit = seg->code32.limit; 266 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd); 267 268 ssd.ssd_def32 = 0; 269 if (flags & BIOSCODE_FLAG) { 270 ssd.ssd_base = seg->code16.base; 271 ssd.ssd_limit = seg->code16.limit; 272 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd); 273 } 274 275 ssd.ssd_type = SDT_MEMRWA; 276 if (flags & BIOSDATA_FLAG) { 277 ssd.ssd_base = seg->data.base; 278 ssd.ssd_limit = seg->data.limit; 279 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd); 280 } 281 282 if (flags & BIOSUTIL_FLAG) { 283 ssd.ssd_base = seg->util.base; 284 ssd.ssd_limit = seg->util.limit; 285 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd); 286 } 287 288 if (flags & BIOSARGS_FLAG) { 289 ssd.ssd_base = seg->args.base; 290 ssd.ssd_limit = seg->args.limit; 291 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd); 292 } 293 } 294 295 extern int vm86pa; 296 extern void bios16_jmp(void); 297 298 /* 299 * this routine is really greedy with selectors, and uses 5: 300 * 301 * 32-bit code selector: to return to kernel 302 * 16-bit code selector: for running code 303 * data selector: for 16-bit data 304 * util selector: extra utility selector 305 * args selector: to handle pointers 306 * 307 * the util selector is set from the util16 entry in bios16_args, if a 308 * "U" specifier is seen. 309 * 310 * See <machine/pc/bios.h> for description of format specifiers 311 */ 312 int 313 bios16(struct bios_args *args, char *fmt, ...) 314 { 315 char *p, *stack, *stack_top; 316 va_list ap; 317 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; 318 u_int i, arg_start, arg_end; 319 u_int *pte, *ptd; 320 321 arg_start = 0xffffffff; 322 arg_end = 0; 323 324 /* 325 * Some BIOS entrypoints attempt to copy the largest-case 326 * argument frame (in order to generalise handling for 327 * different entry types). If our argument frame is 328 * smaller than this, the BIOS will reach off the top of 329 * our constructed stack segment. Pad the top of the stack 330 * with some garbage to avoid this. 331 */ 332 stack = (caddr_t)PAGE_SIZE - 32; 333 334 va_start(ap, fmt); 335 for (p = fmt; p && *p; p++) { 336 switch (*p) { 337 case 'p': /* 32-bit pointer */ 338 i = va_arg(ap, u_int); 339 arg_start = min(arg_start, i); 340 arg_end = max(arg_end, i); 341 flags |= BIOSARGS_FLAG; 342 stack -= 4; 343 break; 344 345 case 'i': /* 32-bit integer */ 346 i = va_arg(ap, u_int); 347 stack -= 4; 348 break; 349 350 case 'U': /* 16-bit selector */ 351 flags |= BIOSUTIL_FLAG; 352 /* FALLTHROUGH */ 353 case 'D': /* 16-bit selector */ 354 case 'C': /* 16-bit selector */ 355 stack -= 2; 356 break; 357 358 case 's': /* 16-bit integer */ 359 i = va_arg(ap, u_short); 360 stack -= 2; 361 break; 362 363 default: 364 return (EINVAL); 365 } 366 } 367 368 if (flags & BIOSARGS_FLAG) { 369 if (arg_end - arg_start > ctob(16)) 370 return (EACCES); 371 args->seg.args.base = arg_start; 372 args->seg.args.limit = 0xffff; 373 } 374 375 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME; 376 args->seg.code32.limit = 0xffff; 377 378 ptd = (u_int *)rcr3(); 379 if (ptd == IdlePTD) { 380 /* 381 * no page table, so create one and install it. 382 */ 383 pte = (u_int *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 384 ptd = (u_int *)((u_int)ptd + KERNBASE); 385 *ptd = vtophys(pte) | PG_RW | PG_V; 386 } else { 387 /* 388 * this is a user-level page table 389 */ 390 pte = (u_int *)&PTmap; 391 } 392 /* 393 * install pointer to page 0. we don't need to flush the tlb, 394 * since there should not be a previous mapping for page 0. 395 */ 396 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; 397 398 stack_top = stack; 399 va_start(ap, fmt); 400 for (p = fmt; p && *p; p++) { 401 switch (*p) { 402 case 'p': /* 32-bit pointer */ 403 i = va_arg(ap, u_int); 404 *(u_int *)stack = (i - arg_start) | 405 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16); 406 stack += 4; 407 break; 408 409 case 'i': /* 32-bit integer */ 410 i = va_arg(ap, u_int); 411 *(u_int *)stack = i; 412 stack += 4; 413 break; 414 415 case 'U': /* 16-bit selector */ 416 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL); 417 stack += 2; 418 break; 419 420 case 'D': /* 16-bit selector */ 421 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL); 422 stack += 2; 423 break; 424 425 case 'C': /* 16-bit selector */ 426 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL); 427 stack += 2; 428 break; 429 430 case 's': /* 16-bit integer */ 431 i = va_arg(ap, u_short); 432 *(u_short *)stack = i; 433 stack += 2; 434 break; 435 436 default: 437 return (EINVAL); 438 } 439 } 440 441 set_bios_selectors(&args->seg, flags); 442 bioscall_vector.vec16.offset = (u_short)args->entry; 443 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); 444 445 i = bios16_call(&args->r, stack_top); 446 447 if (pte == (u_int *)&PTmap) { 448 *pte = 0; /* remove entry */ 449 } else { 450 *ptd = 0; /* remove page table */ 451 free(pte, M_TEMP); /* ... and free it */ 452 } 453 454 /* 455 * XXX only needs to be invlpg(0) but that doesn't work on the 386 456 */ 457 invltlb(); 458 459 return (i); 460 } 461 462 /* 463 * PnP BIOS interface; enumerate devices only known to the system 464 * BIOS and save information about them for later use. 465 */ 466 467 struct pnp_sysdev 468 { 469 u_int16_t size; 470 u_int8_t handle; 471 u_int32_t devid; 472 u_int8_t type[3]; 473 u_int16_t attrib; 474 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ 475 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ 476 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */ 477 #define PNPATTR_INPUT (1<<3) /* can be primary input */ 478 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ 479 #define PNPATTR_DOCK (1<<5) /* is a docking station */ 480 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ 481 #define PNPATTR_CONFIG_STATIC 0x00 482 #define PNPATTR_CONFIG_DYNAMIC 0x07 483 #define PNPATTR_CONFIG_DYNONLY 0x17 484 /* device-specific data comes here */ 485 u_int8_t devdata[0]; 486 } __attribute__ ((packed)); 487 488 /* We have to cluster arguments within a 64k range for the bios16 call */ 489 struct pnp_sysdevargs 490 { 491 u_int16_t next; 492 struct pnp_sysdev node; 493 }; 494 495 /* 496 * This function is called after the bus has assigned resource 497 * locations for a logical device. 498 */ 499 static void 500 pnpbios_set_config(void *arg, struct isa_config *config, int enable) 501 { 502 } 503 504 /* 505 * Quiz the PnP BIOS, build a list of PNP IDs and resource data. 506 */ 507 static void 508 pnpbios_identify(driver_t *driver, device_t parent) 509 { 510 struct PnPBIOS_table *pt = PnPBIOStable; 511 struct bios_args args; 512 struct pnp_sysdev *pd; 513 struct pnp_sysdevargs *pda; 514 u_int16_t ndevs, bigdev; 515 int error, currdev; 516 u_int8_t *devnodebuf, tag; 517 u_int32_t *devid, *compid; 518 int idx, left; 519 device_t dev; 520 521 /* no PnP BIOS information */ 522 if (pt == NULL) 523 return; 524 525 bzero(&args, sizeof(args)); 526 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); 527 args.seg.code16.limit = 0xffff; /* XXX ? */ 528 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); 529 args.seg.data.limit = 0xffff; 530 args.entry = pt->pmentryoffset; 531 532 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) 533 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); 534 ndevs &= 0xff; /* clear high byte garbage */ 535 if (bootverbose) 536 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); 537 538 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), 539 M_DEVBUF, M_NOWAIT); 540 pda = (struct pnp_sysdevargs *)devnodebuf; 541 pd = &pda->node; 542 543 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { 544 545 bzero(pd, bigdev); 546 pda->next = currdev; 547 /* get current configuration */ 548 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, (u_int16_t)1))) { 549 printf("pnpbios: error %d making BIOS16 call\n", error); 550 break; 551 } 552 if ((error = (args.r.eax & 0xff))) { 553 if (bootverbose) 554 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); 555 if (error & 0x80) 556 break; 557 } 558 currdev = pda->next; 559 if (pd->size < sizeof(struct pnp_sysdev)) { 560 printf("pnpbios: bogus system node data, aborting scan\n"); 561 break; 562 } 563 564 /* 565 * If we are in APIC_IO mode, we should ignore the ISA PIC if it 566 * shows up. Likewise, in !APIC_IO mode, we should ignore the 567 * APIC (less important). 568 * This is significant because the ISA PIC will claim IRQ 2 (which 569 * it uses for chaining), while in APIC mode this is a valid IRQ 570 * available for general use. 571 */ 572 #ifdef APIC_IO 573 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0000")) /* ISA PIC */ 574 continue; 575 #else 576 if (!strcmp(pnp_eisaformat(pd->devid), "PNP0003")) /* APIC */ 577 continue; 578 #endif 579 580 /* Add the device and parse its resources */ 581 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 582 isa_set_vendorid(dev, pd->devid); 583 isa_set_logicalid(dev, pd->devid); 584 ISA_SET_CONFIG_CALLBACK(parent, dev, pnpbios_set_config, 0); 585 pnp_parse_resources(dev, &pd->devdata[0], 586 pd->size - sizeof(struct pnp_sysdev), 587 isa_get_vendorid(dev), isa_get_logicalid(dev), 0); 588 if (!device_get_desc(dev)) 589 device_set_desc_copy(dev, pnp_eisaformat(pd->devid)); 590 591 /* Find device IDs */ 592 devid = &pd->devid; 593 compid = NULL; 594 595 /* look for a compatible device ID too */ 596 left = pd->size - sizeof(struct pnp_sysdev); 597 idx = 0; 598 while (idx < left) { 599 tag = pd->devdata[idx++]; 600 if (PNP_RES_TYPE(tag) == 0) { 601 /* Small resource */ 602 switch (PNP_SRES_NUM(tag)) { 603 case PNP_TAG_COMPAT_DEVICE: 604 compid = (u_int32_t *)(pd->devdata + idx); 605 if (bootverbose) 606 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); 607 /* FALLTHROUGH */ 608 case PNP_TAG_END: 609 idx = left; 610 break; 611 default: 612 idx += PNP_SRES_LEN(tag); 613 break; 614 } 615 } else 616 /* Large resource, skip it */ 617 idx += *(u_int16_t *)(pd->devdata + idx) + 2; 618 } 619 if (bootverbose) { 620 printf("pnpbios: handle %d device ID %s (%08x)", 621 pd->handle, pnp_eisaformat(*devid), *devid); 622 if (compid != NULL) 623 printf(" compat ID %s (%08x)", 624 pnp_eisaformat(*compid), *compid); 625 printf("\n"); 626 } 627 } 628 } 629 630 static device_method_t pnpbios_methods[] = { 631 /* Device interface */ 632 DEVMETHOD(device_identify, pnpbios_identify), 633 634 { 0, 0 } 635 }; 636 637 static driver_t pnpbios_driver = { 638 "pnpbios", 639 pnpbios_methods, 640 1, /* no softc */ 641 }; 642 643 static devclass_t pnpbios_devclass; 644 645 DRIVER_MODULE(pnpbios, isa, pnpbios_driver, pnpbios_devclass, 0, 0); 646