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/proc.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <vm/vm.h> 40 #include <vm/pmap.h> 41 #include <machine/md_var.h> 42 #include <machine/segments.h> 43 #include <machine/stdarg.h> 44 #include <machine/tss.h> 45 #include <machine/vmparam.h> 46 #include <machine/pc/bios.h> 47 #include <isa/pnpreg.h> 48 49 #define BIOS_START 0xe0000 50 #define BIOS_SIZE 0x20000 51 52 /* exported lookup results */ 53 struct bios32_SDentry PCIbios = {entry : 0}; 54 struct PnPBIOS_table *PnPBIOStable = 0; 55 56 static u_int bios32_SDCI = 0; 57 58 /* start fairly early */ 59 static void bios32_init(void *junk); 60 SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL); 61 62 static void pnpbios_scan(void); 63 static char *pnp_eisaformat(u_int8_t *data); 64 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 80 /* 81 * BIOS32 Service Directory 82 */ 83 84 /* look for the signature */ 85 if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) { 86 87 /* get a virtual pointer to the structure */ 88 sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 89 for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) { 90 ck += cv[i]; 91 } 92 /* If checksum is OK, enable use of the entrypoint */ 93 if ((ck == 0) && (sdh->entry < (BIOS_START + BIOS_SIZE))) { 94 bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry); 95 if (bootverbose) { 96 printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh); 97 printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n", 98 sdh->entry, bios32_SDCI, sdh->revision, sdh->len); 99 } 100 /* See if there's a PCI BIOS entrypoint here */ 101 PCIbios.ident.id = 0x49435024; /* PCI systems should have this */ 102 if (!bios32_SDlookup(&PCIbios) && bootverbose) 103 printf("pcibios: PCI BIOS entry at 0x%x\n", PCIbios.entry); 104 } else { 105 printf("bios32: Bad BIOS32 Service Directory\n"); 106 } 107 } 108 109 /* 110 * PnP BIOS 111 */ 112 if ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0) { 113 114 /* get a virtual pointer to the structure */ 115 pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); 116 for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) { 117 ck += cv[i]; 118 } 119 /* If checksum is OK, enable use of the entrypoint */ 120 if (ck == 0) { 121 PnPBIOStable = pt; 122 if (bootverbose) { 123 printf("pnpbios: Found PnP BIOS data at %p\n", pt); 124 printf("pnpbios: Entry = %x:%x Rev = %d.%d\n", 125 pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf); 126 if ((pt->control & 0x3) == 0x01) 127 printf("pnpbios: Event flag at %x\n", pt->evflagaddr); 128 if (pt->oemdevid != 0) 129 printf("pnpbios: OEM ID %x\n", pt->oemdevid); 130 131 } 132 pnpbios_scan(); 133 } else { 134 printf("pnpbios: Bad PnP BIOS data checksum\n"); 135 } 136 } 137 138 if (bootverbose) { 139 /* look for other know signatures */ 140 printf("Other BIOS signatures found:\n"); 141 printf("ACPI: %08x\n", bios_sigsearch(0, "RST PTR", 8, 16, 0)); 142 } 143 } 144 145 /* 146 * bios32_SDlookup 147 * 148 * Query the BIOS32 Service Directory for the service named in (ent), 149 * returns nonzero if the lookup fails. The caller must fill in 150 * (ent->ident), the remainder are populated on a successful lookup. 151 */ 152 int 153 bios32_SDlookup(struct bios32_SDentry *ent) 154 { 155 struct bios_regs args; 156 157 if (bios32_SDCI == 0) 158 return (1); 159 160 args.eax = ent->ident.id; /* set up arguments */ 161 args.ebx = args.ecx = args.edx = 0; 162 bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL)); 163 if ((args.eax & 0xff) == 0) { /* success? */ 164 ent->base = args.ebx; 165 ent->len = args.ecx; 166 ent->entry = args.edx; 167 return (0); /* all OK */ 168 } 169 return (1); /* failed */ 170 } 171 172 173 /* 174 * bios_sigsearch 175 * 176 * Search some or all of the BIOS region for a signature string. 177 * 178 * (start) Optional offset returned from this function 179 * (for searching for multiple matches), or NULL 180 * to start the search from the base of the BIOS. 181 * Note that this will be a _physical_ address in 182 * the range 0xe0000 - 0xfffff. 183 * (sig) is a pointer to the byte(s) of the signature. 184 * (siglen) number of bytes in the signature. 185 * (paralen) signature paragraph (alignment) size. 186 * (sigofs) offset of the signature within the paragraph. 187 * 188 * Returns the _physical_ address of the found signature, 0 if the 189 * signature was not found. 190 */ 191 192 u_int32_t 193 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs) 194 { 195 u_char *sp, *end; 196 197 /* compute the starting address */ 198 if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) { 199 sp = (char *)BIOS_PADDRTOVADDR(start); 200 } else if (start == 0) { 201 sp = (char *)BIOS_PADDRTOVADDR(BIOS_START); 202 } else { 203 return 0; /* bogus start address */ 204 } 205 206 /* compute the end address */ 207 end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE); 208 209 /* loop searching */ 210 while ((sp + sigofs + siglen) < end) { 211 212 /* compare here */ 213 if (!bcmp(sp + sigofs, sig, siglen)) { 214 /* convert back to physical address */ 215 return((u_int32_t)BIOS_VADDRTOPADDR(sp)); 216 } 217 sp += paralen; 218 } 219 return(0); 220 } 221 222 /* 223 * do not staticize, used by bioscall.s 224 */ 225 union { 226 struct { 227 u_short offset; 228 u_short segment; 229 } vec16; 230 struct { 231 u_int offset; 232 u_short segment; 233 } vec32; 234 } bioscall_vector; /* bios jump vector */ 235 236 void 237 set_bios_selectors(struct bios_segments *seg, int flags) 238 { 239 struct soft_segment_descriptor ssd = { 240 0, /* segment base address (overwritten) */ 241 0, /* length (overwritten) */ 242 SDT_MEMERA, /* segment type (overwritten) */ 243 0, /* priority level */ 244 1, /* descriptor present */ 245 0, 0, 246 1, /* descriptor size (overwritten) */ 247 0 /* granularity == byte units */ 248 }; 249 union descriptor *p_gdt; 250 251 #ifdef SMP 252 p_gdt = &gdt[cpuid]; 253 #else 254 p_gdt = gdt; 255 #endif 256 257 ssd.ssd_base = seg->code32.base; 258 ssd.ssd_limit = seg->code32.limit; 259 ssdtosd(&ssd, &p_gdt[GBIOSCODE32_SEL].sd); 260 261 ssd.ssd_def32 = 0; 262 if (flags & BIOSCODE_FLAG) { 263 ssd.ssd_base = seg->code16.base; 264 ssd.ssd_limit = seg->code16.limit; 265 ssdtosd(&ssd, &p_gdt[GBIOSCODE16_SEL].sd); 266 } 267 268 ssd.ssd_type = SDT_MEMRWA; 269 if (flags & BIOSDATA_FLAG) { 270 ssd.ssd_base = seg->data.base; 271 ssd.ssd_limit = seg->data.limit; 272 ssdtosd(&ssd, &p_gdt[GBIOSDATA_SEL].sd); 273 } 274 275 if (flags & BIOSUTIL_FLAG) { 276 ssd.ssd_base = seg->util.base; 277 ssd.ssd_limit = seg->util.limit; 278 ssdtosd(&ssd, &p_gdt[GBIOSUTIL_SEL].sd); 279 } 280 281 if (flags & BIOSARGS_FLAG) { 282 ssd.ssd_base = seg->args.base; 283 ssd.ssd_limit = seg->args.limit; 284 ssdtosd(&ssd, &p_gdt[GBIOSARGS_SEL].sd); 285 } 286 } 287 288 extern int vm86pa; 289 extern void bios16_jmp(void); 290 291 /* 292 * this routine is really greedy with selectors, and uses 5: 293 * 294 * 32-bit code selector: to return to kernel 295 * 16-bit code selector: for running code 296 * data selector: for 16-bit data 297 * util selector: extra utility selector 298 * args selector: to handle pointers 299 * 300 * the util selector is set from the util16 entry in bios16_args, if a 301 * "U" specifier is seen. 302 * 303 * See <machine/pc/bios.h> for description of format specifiers 304 */ 305 int 306 bios16(struct bios_args *args, char *fmt, ...) 307 { 308 char *p, *stack, *stack_top; 309 va_list ap; 310 int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; 311 u_int i, arg_start, arg_end; 312 u_int *pte, *ptd; 313 314 arg_start = 0xffffffff; 315 arg_end = 0; 316 317 /* 318 * Some BIOS entrypoints attempt to copy the largest-case 319 * argument frame (in order to generalise handling for 320 * different entry types). If our argument frame is 321 * smaller than this, the BIOS will reach off the top of 322 * our constructed stack segment. Pad the top of the stack 323 * with some garbage to avoid this. 324 */ 325 stack = (caddr_t)PAGE_SIZE - 32; 326 327 va_start(ap, fmt); 328 for (p = fmt; p && *p; p++) { 329 switch (*p) { 330 case 'p': /* 32-bit pointer */ 331 i = va_arg(ap, u_int); 332 arg_start = min(arg_start, i); 333 arg_end = max(arg_end, i); 334 flags |= BIOSARGS_FLAG; 335 stack -= 4; 336 break; 337 338 case 'i': /* 32-bit integer */ 339 i = va_arg(ap, u_int); 340 stack -= 4; 341 break; 342 343 case 'U': /* 16-bit selector */ 344 flags |= BIOSUTIL_FLAG; 345 /* FALLTHROUGH */ 346 case 'D': /* 16-bit selector */ 347 case 'C': /* 16-bit selector */ 348 stack -= 2; 349 break; 350 351 case 's': /* 16-bit integer */ 352 i = va_arg(ap, u_short); 353 stack -= 2; 354 break; 355 356 default: 357 return (EINVAL); 358 } 359 } 360 361 if (flags & BIOSARGS_FLAG) { 362 if (arg_end - arg_start > ctob(16)) 363 return (EACCES); 364 args->seg.args.base = arg_start; 365 args->seg.args.limit = 0xffff; 366 } 367 368 args->seg.code32.base = (u_int)&bios16_jmp & PG_FRAME; 369 args->seg.code32.limit = 0xffff; 370 371 ptd = (u_int *)rcr3(); 372 if (ptd == IdlePTD) { 373 /* 374 * no page table, so create one and install it. 375 */ 376 pte = (u_int *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); 377 ptd = (u_int *)((u_int)ptd + KERNBASE); 378 *ptd = vtophys(pte) | PG_RW | PG_V; 379 } else { 380 /* 381 * this is a user-level page table 382 */ 383 pte = (u_int *)&PTmap; 384 } 385 /* 386 * install pointer to page 0. we don't need to flush the tlb, 387 * since there should not be a previous mapping for page 0. 388 */ 389 *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; 390 391 stack_top = stack; 392 va_start(ap, fmt); 393 for (p = fmt; p && *p; p++) { 394 switch (*p) { 395 case 'p': /* 32-bit pointer */ 396 i = va_arg(ap, u_int); 397 *(u_int *)stack = (i - arg_start) | 398 (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16); 399 stack += 4; 400 break; 401 402 case 'i': /* 32-bit integer */ 403 i = va_arg(ap, u_int); 404 *(u_int *)stack = i; 405 stack += 4; 406 break; 407 408 case 'U': /* 16-bit selector */ 409 *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL); 410 stack += 2; 411 break; 412 413 case 'D': /* 16-bit selector */ 414 *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL); 415 stack += 2; 416 break; 417 418 case 'C': /* 16-bit selector */ 419 *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL); 420 stack += 2; 421 break; 422 423 case 's': /* 16-bit integer */ 424 i = va_arg(ap, u_short); 425 *(u_short *)stack = i; 426 stack += 2; 427 break; 428 429 default: 430 return (EINVAL); 431 } 432 } 433 434 set_bios_selectors(&args->seg, flags); 435 bioscall_vector.vec16.offset = (u_short)args->entry; 436 bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); 437 438 i = bios16_call(&args->r, stack_top); 439 440 if (pte == (u_int *)&PTmap) { 441 *pte = 0; /* remove entry */ 442 } else { 443 *ptd = 0; /* remove page table */ 444 free(pte, M_TEMP); /* ... and free it */ 445 } 446 447 /* 448 * XXX only needs to be invlpg(0) but that doesn't work on the 386 449 */ 450 invltlb(); 451 452 return (i); 453 } 454 455 /* 456 * PnP BIOS interface; enumerate devices only known to the system 457 * BIOS and save information about them for later use. 458 */ 459 460 struct pnp_sysdev 461 { 462 u_int16_t size; 463 u_int8_t handle; 464 u_int32_t devid; 465 u_int8_t type[3]; 466 u_int16_t attrib; 467 #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ 468 #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ 469 #define PNPATTR_OUTPUT (1<<2) /* can be primary output */ 470 #define PNPATTR_INPUT (1<<3) /* can be primary input */ 471 #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ 472 #define PNPATTR_DOCK (1<<5) /* is a docking station */ 473 #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ 474 #define PNPATTR_CONFIG_STATIC 0x00 475 #define PNPATTR_CONFIG_DYNAMIC 0x07 476 #define PNPATTR_CONFIG_DYNONLY 0x17 477 /* device-specific data comes here */ 478 u_int8_t devdata[0]; 479 } __attribute__ ((packed)); 480 481 /* We have to cluster arguments within a 64k range for the bios16 call */ 482 struct pnp_sysdevargs 483 { 484 u_int16_t next; 485 struct pnp_sysdev node; 486 }; 487 488 /* 489 * Quiz the PnP BIOS, build a list of PNP IDs and resource data. 490 */ 491 static void 492 pnpbios_scan(void) 493 { 494 struct PnPBIOS_table *pt = PnPBIOStable; 495 struct bios_args args; 496 struct pnp_sysdev *pd; 497 struct pnp_sysdevargs *pda; 498 u_int16_t ndevs, bigdev; 499 int error, currdev; 500 u_int8_t *devnodebuf, tag; 501 u_int32_t *devid, *compid; 502 int idx, left; 503 504 /* no PnP BIOS information */ 505 if (pt == NULL) 506 return; 507 508 bzero(&args, sizeof(args)); 509 args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); 510 args.seg.code16.limit = 0xffff; /* XXX ? */ 511 args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); 512 args.seg.data.limit = 0xffff; 513 args.entry = pt->pmentryoffset; 514 515 if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) 516 printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); 517 if (bootverbose) 518 printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); 519 520 devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), 521 M_DEVBUF, M_NOWAIT); 522 pda = (struct pnp_sysdevargs *)devnodebuf; 523 pd = &pda->node; 524 525 for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { 526 527 bzero(pd, bigdev); 528 pda->next = currdev; 529 /* get current configuration */ 530 if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, (u_int16_t)1))) { 531 printf("pnpbios: error %d making BIOS16 call\n", error); 532 break; 533 } 534 if ((error = (args.r.eax & 0xff))) { 535 if (bootverbose) 536 printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); 537 if (error & 0x80) 538 break; 539 } 540 currdev = pda->next; 541 if (pd->size < sizeof(struct pnp_sysdev)) { 542 printf("pnpbios: bogus system node data, aborting scan\n"); 543 break; 544 } 545 546 /* Find device IDs */ 547 devid = &pd->devid; 548 compid = NULL; 549 550 /* look for a compatible device ID too */ 551 left = pd->size - sizeof(struct pnp_sysdev); 552 idx = 0; 553 while (idx < left) { 554 tag = pd->devdata[idx++]; 555 if (PNP_RES_TYPE(tag) == 0) { 556 /* Small resource */ 557 switch (PNP_SRES_NUM(tag)) { 558 case PNP_TAG_COMPAT_DEVICE: 559 compid = (u_int32_t *)(pd->devdata + idx); 560 if (bootverbose) 561 printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); 562 /* FALLTHROUGH */ 563 case PNP_TAG_END: 564 idx = left; 565 break; 566 default: 567 idx += PNP_SRES_LEN(tag); 568 break; 569 } 570 } else 571 /* Large resource, skip it */ 572 idx += *(u_int16_t *)(pd->devdata + idx) + 2; 573 } 574 if (bootverbose) { 575 printf("pnpbios: handle %d device ID %s (%08x)", 576 pd->handle, pnp_eisaformat((u_int8_t *)devid), *devid); 577 if (compid != NULL) 578 printf(" compat ID %s (%08x)", 579 pnp_eisaformat((u_int8_t *)compid), *compid); 580 printf("\n"); 581 } 582 } 583 } 584 585 /* XXX should be somewhere else */ 586 static char * 587 pnp_eisaformat(u_int8_t *data) 588 { 589 static char idbuf[8]; 590 const char hextoascii[] = "0123456789abcdef"; 591 592 idbuf[0] = '@' + ((data[0] & 0x7c) >> 2); 593 idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5)); 594 idbuf[2] = '@' + (data[1] & 0x1f); 595 idbuf[3] = hextoascii[(data[2] >> 4)]; 596 idbuf[4] = hextoascii[(data[2] & 0xf)]; 597 idbuf[5] = hextoascii[(data[3] >> 4)]; 598 idbuf[6] = hextoascii[(data[3] & 0xf)]; 599 idbuf[7] = 0; 600 return(idbuf); 601 } 602