Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/compat/x86bios/x86bios.c
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1 /*- 2 * Copyright (c) 2009 Alex Keda <admin@lissyara.su> 3 * Copyright (c) 2009-2010 Jung-uk Kim <jkim@FreeBSD.org> 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 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD: releng/9.0/sys/compat/x86bios/x86bios.c 219430 2011-03-09 16:16:38Z jkim $"); 30 31 #include "opt_x86bios.h" 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/sysctl.h> 41 42 #include <contrib/x86emu/x86emu.h> 43 #include <contrib/x86emu/x86emu_regs.h> 44 #include <compat/x86bios/x86bios.h> 45 46 #include <dev/pci/pcireg.h> 47 #include <dev/pci/pcivar.h> 48 49 #include <vm/vm.h> 50 #include <vm/pmap.h> 51 52 #ifdef __amd64__ 53 #define X86BIOS_NATIVE_ARCH 54 #endif 55 #ifdef __i386__ 56 #define X86BIOS_NATIVE_VM86 57 #endif 58 59 #define X86BIOS_MEM_SIZE 0x00100000 /* 1M */ 60 61 #define X86BIOS_TRACE(h, n, r) do { \ 62 printf(__STRING(h) \ 63 " (ax=0x%04x bx=0x%04x cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",\ 64 (n), (r)->R_AX, (r)->R_BX, (r)->R_CX, (r)->R_DX, \ 65 (r)->R_ES, (r)->R_DI); \ 66 } while (0) 67 68 static struct mtx x86bios_lock; 69 70 SYSCTL_NODE(_debug, OID_AUTO, x86bios, CTLFLAG_RD, NULL, "x86bios debugging"); 71 static int x86bios_trace_call; 72 TUNABLE_INT("debug.x86bios.call", &x86bios_trace_call); 73 SYSCTL_INT(_debug_x86bios, OID_AUTO, call, CTLFLAG_RW, &x86bios_trace_call, 0, 74 "Trace far function calls"); 75 static int x86bios_trace_int; 76 TUNABLE_INT("debug.x86bios.int", &x86bios_trace_int); 77 SYSCTL_INT(_debug_x86bios, OID_AUTO, int, CTLFLAG_RW, &x86bios_trace_int, 0, 78 "Trace software interrupt handlers"); 79 80 #ifdef X86BIOS_NATIVE_VM86 81 82 #include <machine/vm86.h> 83 #include <machine/vmparam.h> 84 #include <machine/pc/bios.h> 85 86 struct vm86context x86bios_vmc; 87 88 static void 89 x86bios_emu2vmf(struct x86emu_regs *regs, struct vm86frame *vmf) 90 { 91 92 vmf->vmf_ds = regs->R_DS; 93 vmf->vmf_es = regs->R_ES; 94 vmf->vmf_ax = regs->R_AX; 95 vmf->vmf_bx = regs->R_BX; 96 vmf->vmf_cx = regs->R_CX; 97 vmf->vmf_dx = regs->R_DX; 98 vmf->vmf_bp = regs->R_BP; 99 vmf->vmf_si = regs->R_SI; 100 vmf->vmf_di = regs->R_DI; 101 } 102 103 static void 104 x86bios_vmf2emu(struct vm86frame *vmf, struct x86emu_regs *regs) 105 { 106 107 regs->R_DS = vmf->vmf_ds; 108 regs->R_ES = vmf->vmf_es; 109 regs->R_FLG = vmf->vmf_flags; 110 regs->R_AX = vmf->vmf_ax; 111 regs->R_BX = vmf->vmf_bx; 112 regs->R_CX = vmf->vmf_cx; 113 regs->R_DX = vmf->vmf_dx; 114 regs->R_BP = vmf->vmf_bp; 115 regs->R_SI = vmf->vmf_si; 116 regs->R_DI = vmf->vmf_di; 117 } 118 119 void * 120 x86bios_alloc(uint32_t *offset, size_t size, int flags) 121 { 122 void *vaddr; 123 int i; 124 125 if (offset == NULL || size == 0) 126 return (NULL); 127 vaddr = contigmalloc(size, M_DEVBUF, flags, 0, X86BIOS_MEM_SIZE, 128 PAGE_SIZE, 0); 129 if (vaddr != NULL) { 130 *offset = vtophys(vaddr); 131 mtx_lock(&x86bios_lock); 132 for (i = 0; i < atop(round_page(size)); i++) 133 vm86_addpage(&x86bios_vmc, atop(*offset) + i, 134 (vm_offset_t)vaddr + ptoa(i)); 135 mtx_unlock(&x86bios_lock); 136 } 137 138 return (vaddr); 139 } 140 141 void 142 x86bios_free(void *addr, size_t size) 143 { 144 vm_paddr_t paddr; 145 int i, nfree; 146 147 if (addr == NULL || size == 0) 148 return; 149 paddr = vtophys(addr); 150 if (paddr >= X86BIOS_MEM_SIZE || (paddr & PAGE_MASK) != 0) 151 return; 152 mtx_lock(&x86bios_lock); 153 for (i = 0; i < x86bios_vmc.npages; i++) 154 if (x86bios_vmc.pmap[i].kva == (vm_offset_t)addr) 155 break; 156 if (i >= x86bios_vmc.npages) { 157 mtx_unlock(&x86bios_lock); 158 return; 159 } 160 nfree = atop(round_page(size)); 161 bzero(x86bios_vmc.pmap + i, sizeof(*x86bios_vmc.pmap) * nfree); 162 if (i + nfree == x86bios_vmc.npages) { 163 x86bios_vmc.npages -= nfree; 164 while (--i >= 0 && x86bios_vmc.pmap[i].kva == 0) 165 x86bios_vmc.npages--; 166 } 167 mtx_unlock(&x86bios_lock); 168 contigfree(addr, size, M_DEVBUF); 169 } 170 171 void 172 x86bios_init_regs(struct x86regs *regs) 173 { 174 175 bzero(regs, sizeof(*regs)); 176 } 177 178 void 179 x86bios_call(struct x86regs *regs, uint16_t seg, uint16_t off) 180 { 181 struct vm86frame vmf; 182 183 if (x86bios_trace_call) 184 X86BIOS_TRACE(Calling 0x%06x, (seg << 4) + off, regs); 185 186 bzero(&vmf, sizeof(vmf)); 187 x86bios_emu2vmf((struct x86emu_regs *)regs, &vmf); 188 vmf.vmf_cs = seg; 189 vmf.vmf_ip = off; 190 mtx_lock(&x86bios_lock); 191 vm86_datacall(-1, &vmf, &x86bios_vmc); 192 mtx_unlock(&x86bios_lock); 193 x86bios_vmf2emu(&vmf, (struct x86emu_regs *)regs); 194 195 if (x86bios_trace_call) 196 X86BIOS_TRACE(Exiting 0x%06x, (seg << 4) + off, regs); 197 } 198 199 uint32_t 200 x86bios_get_intr(int intno) 201 { 202 203 return (readl(BIOS_PADDRTOVADDR(intno * 4))); 204 } 205 206 void 207 x86bios_set_intr(int intno, uint32_t saddr) 208 { 209 210 writel(BIOS_PADDRTOVADDR(intno * 4), saddr); 211 } 212 213 void 214 x86bios_intr(struct x86regs *regs, int intno) 215 { 216 struct vm86frame vmf; 217 218 if (x86bios_trace_int) 219 X86BIOS_TRACE(Calling INT 0x%02x, intno, regs); 220 221 bzero(&vmf, sizeof(vmf)); 222 x86bios_emu2vmf((struct x86emu_regs *)regs, &vmf); 223 mtx_lock(&x86bios_lock); 224 vm86_datacall(intno, &vmf, &x86bios_vmc); 225 mtx_unlock(&x86bios_lock); 226 x86bios_vmf2emu(&vmf, (struct x86emu_regs *)regs); 227 228 if (x86bios_trace_int) 229 X86BIOS_TRACE(Exiting INT 0x%02x, intno, regs); 230 } 231 232 void * 233 x86bios_offset(uint32_t offset) 234 { 235 vm_offset_t addr; 236 237 addr = vm86_getaddr(&x86bios_vmc, X86BIOS_PHYSTOSEG(offset), 238 X86BIOS_PHYSTOOFF(offset)); 239 if (addr == 0) 240 addr = BIOS_PADDRTOVADDR(offset); 241 242 return ((void *)addr); 243 } 244 245 static int 246 x86bios_init(void) 247 { 248 249 mtx_init(&x86bios_lock, "x86bios lock", NULL, MTX_DEF); 250 bzero(&x86bios_vmc, sizeof(x86bios_vmc)); 251 252 return (0); 253 } 254 255 static int 256 x86bios_uninit(void) 257 { 258 259 mtx_destroy(&x86bios_lock); 260 261 return (0); 262 } 263 264 #else 265 266 #include <machine/iodev.h> 267 268 #define X86BIOS_PAGE_SIZE 0x00001000 /* 4K */ 269 270 #define X86BIOS_IVT_SIZE 0x00000500 /* 1K + 256 (BDA) */ 271 272 #define X86BIOS_IVT_BASE 0x00000000 273 #define X86BIOS_RAM_BASE 0x00001000 274 #define X86BIOS_ROM_BASE 0x000a0000 275 276 #define X86BIOS_ROM_SIZE (X86BIOS_MEM_SIZE - x86bios_rom_phys) 277 #define X86BIOS_SEG_SIZE X86BIOS_PAGE_SIZE 278 279 #define X86BIOS_PAGES (X86BIOS_MEM_SIZE / X86BIOS_PAGE_SIZE) 280 281 #define X86BIOS_R_SS _pad2 282 #define X86BIOS_R_SP _pad3.I16_reg.x_reg 283 284 static struct x86emu x86bios_emu; 285 286 static void *x86bios_ivt; 287 static void *x86bios_rom; 288 static void *x86bios_seg; 289 290 static vm_offset_t *x86bios_map; 291 292 static vm_paddr_t x86bios_rom_phys; 293 static vm_paddr_t x86bios_seg_phys; 294 295 static int x86bios_fault; 296 static uint32_t x86bios_fault_addr; 297 static uint16_t x86bios_fault_cs; 298 static uint16_t x86bios_fault_ip; 299 300 static void 301 x86bios_set_fault(struct x86emu *emu, uint32_t addr) 302 { 303 304 x86bios_fault = 1; 305 x86bios_fault_addr = addr; 306 x86bios_fault_cs = emu->x86.R_CS; 307 x86bios_fault_ip = emu->x86.R_IP; 308 x86emu_halt_sys(emu); 309 } 310 311 static void * 312 x86bios_get_pages(uint32_t offset, size_t size) 313 { 314 vm_offset_t addr; 315 316 if (offset + size > X86BIOS_MEM_SIZE + X86BIOS_IVT_SIZE) 317 return (NULL); 318 319 if (offset >= X86BIOS_MEM_SIZE) 320 offset -= X86BIOS_MEM_SIZE; 321 addr = x86bios_map[offset / X86BIOS_PAGE_SIZE]; 322 if (addr != 0) 323 addr += offset % X86BIOS_PAGE_SIZE; 324 325 return ((void *)addr); 326 } 327 328 static void 329 x86bios_set_pages(vm_offset_t va, vm_paddr_t pa, size_t size) 330 { 331 int i, j; 332 333 for (i = pa / X86BIOS_PAGE_SIZE, j = 0; 334 j < howmany(size, X86BIOS_PAGE_SIZE); i++, j++) 335 x86bios_map[i] = va + j * X86BIOS_PAGE_SIZE; 336 } 337 338 static uint8_t 339 x86bios_emu_rdb(struct x86emu *emu, uint32_t addr) 340 { 341 uint8_t *va; 342 343 va = x86bios_get_pages(addr, sizeof(*va)); 344 if (va == NULL) 345 x86bios_set_fault(emu, addr); 346 347 return (*va); 348 } 349 350 static uint16_t 351 x86bios_emu_rdw(struct x86emu *emu, uint32_t addr) 352 { 353 uint16_t *va; 354 355 va = x86bios_get_pages(addr, sizeof(*va)); 356 if (va == NULL) 357 x86bios_set_fault(emu, addr); 358 359 #ifndef __NO_STRICT_ALIGNMENT 360 if ((addr & 1) != 0) 361 return (le16dec(va)); 362 else 363 #endif 364 return (le16toh(*va)); 365 } 366 367 static uint32_t 368 x86bios_emu_rdl(struct x86emu *emu, uint32_t addr) 369 { 370 uint32_t *va; 371 372 va = x86bios_get_pages(addr, sizeof(*va)); 373 if (va == NULL) 374 x86bios_set_fault(emu, addr); 375 376 #ifndef __NO_STRICT_ALIGNMENT 377 if ((addr & 3) != 0) 378 return (le32dec(va)); 379 else 380 #endif 381 return (le32toh(*va)); 382 } 383 384 static void 385 x86bios_emu_wrb(struct x86emu *emu, uint32_t addr, uint8_t val) 386 { 387 uint8_t *va; 388 389 va = x86bios_get_pages(addr, sizeof(*va)); 390 if (va == NULL) 391 x86bios_set_fault(emu, addr); 392 393 *va = val; 394 } 395 396 static void 397 x86bios_emu_wrw(struct x86emu *emu, uint32_t addr, uint16_t val) 398 { 399 uint16_t *va; 400 401 va = x86bios_get_pages(addr, sizeof(*va)); 402 if (va == NULL) 403 x86bios_set_fault(emu, addr); 404 405 #ifndef __NO_STRICT_ALIGNMENT 406 if ((addr & 1) != 0) 407 le16enc(va, val); 408 else 409 #endif 410 *va = htole16(val); 411 } 412 413 static void 414 x86bios_emu_wrl(struct x86emu *emu, uint32_t addr, uint32_t val) 415 { 416 uint32_t *va; 417 418 va = x86bios_get_pages(addr, sizeof(*va)); 419 if (va == NULL) 420 x86bios_set_fault(emu, addr); 421 422 #ifndef __NO_STRICT_ALIGNMENT 423 if ((addr & 3) != 0) 424 le32enc(va, val); 425 else 426 #endif 427 *va = htole32(val); 428 } 429 430 static uint8_t 431 x86bios_emu_inb(struct x86emu *emu, uint16_t port) 432 { 433 434 #ifndef X86BIOS_NATIVE_ARCH 435 if (port == 0xb2) /* APM scratch register */ 436 return (0); 437 if (port >= 0x80 && port < 0x88) /* POST status register */ 438 return (0); 439 #endif 440 441 return (iodev_read_1(port)); 442 } 443 444 static uint16_t 445 x86bios_emu_inw(struct x86emu *emu, uint16_t port) 446 { 447 uint16_t val; 448 449 #ifndef X86BIOS_NATIVE_ARCH 450 if (port >= 0x80 && port < 0x88) /* POST status register */ 451 return (0); 452 453 if ((port & 1) != 0) { 454 val = iodev_read_1(port); 455 val |= iodev_read_1(port + 1) << 8; 456 } else 457 #endif 458 val = iodev_read_2(port); 459 460 return (val); 461 } 462 463 static uint32_t 464 x86bios_emu_inl(struct x86emu *emu, uint16_t port) 465 { 466 uint32_t val; 467 468 #ifndef X86BIOS_NATIVE_ARCH 469 if (port >= 0x80 && port < 0x88) /* POST status register */ 470 return (0); 471 472 if ((port & 1) != 0) { 473 val = iodev_read_1(port); 474 val |= iodev_read_2(port + 1) << 8; 475 val |= iodev_read_1(port + 3) << 24; 476 } else if ((port & 2) != 0) { 477 val = iodev_read_2(port); 478 val |= iodev_read_2(port + 2) << 16; 479 } else 480 #endif 481 val = iodev_read_4(port); 482 483 return (val); 484 } 485 486 static void 487 x86bios_emu_outb(struct x86emu *emu, uint16_t port, uint8_t val) 488 { 489 490 #ifndef X86BIOS_NATIVE_ARCH 491 if (port == 0xb2) /* APM scratch register */ 492 return; 493 if (port >= 0x80 && port < 0x88) /* POST status register */ 494 return; 495 #endif 496 497 iodev_write_1(port, val); 498 } 499 500 static void 501 x86bios_emu_outw(struct x86emu *emu, uint16_t port, uint16_t val) 502 { 503 504 #ifndef X86BIOS_NATIVE_ARCH 505 if (port >= 0x80 && port < 0x88) /* POST status register */ 506 return; 507 508 if ((port & 1) != 0) { 509 iodev_write_1(port, val); 510 iodev_write_1(port + 1, val >> 8); 511 } else 512 #endif 513 iodev_write_2(port, val); 514 } 515 516 static void 517 x86bios_emu_outl(struct x86emu *emu, uint16_t port, uint32_t val) 518 { 519 520 #ifndef X86BIOS_NATIVE_ARCH 521 if (port >= 0x80 && port < 0x88) /* POST status register */ 522 return; 523 524 if ((port & 1) != 0) { 525 iodev_write_1(port, val); 526 iodev_write_2(port + 1, val >> 8); 527 iodev_write_1(port + 3, val >> 24); 528 } else if ((port & 2) != 0) { 529 iodev_write_2(port, val); 530 iodev_write_2(port + 2, val >> 16); 531 } else 532 #endif 533 iodev_write_4(port, val); 534 } 535 536 void * 537 x86bios_alloc(uint32_t *offset, size_t size, int flags) 538 { 539 void *vaddr; 540 541 if (offset == NULL || size == 0) 542 return (NULL); 543 vaddr = contigmalloc(size, M_DEVBUF, flags, X86BIOS_RAM_BASE, 544 x86bios_rom_phys, X86BIOS_PAGE_SIZE, 0); 545 if (vaddr != NULL) { 546 *offset = vtophys(vaddr); 547 mtx_lock(&x86bios_lock); 548 x86bios_set_pages((vm_offset_t)vaddr, *offset, size); 549 mtx_unlock(&x86bios_lock); 550 } 551 552 return (vaddr); 553 } 554 555 void 556 x86bios_free(void *addr, size_t size) 557 { 558 vm_paddr_t paddr; 559 560 if (addr == NULL || size == 0) 561 return; 562 paddr = vtophys(addr); 563 if (paddr < X86BIOS_RAM_BASE || paddr >= x86bios_rom_phys || 564 paddr % X86BIOS_PAGE_SIZE != 0) 565 return; 566 mtx_lock(&x86bios_lock); 567 bzero(x86bios_map + paddr / X86BIOS_PAGE_SIZE, 568 sizeof(*x86bios_map) * howmany(size, X86BIOS_PAGE_SIZE)); 569 mtx_unlock(&x86bios_lock); 570 contigfree(addr, size, M_DEVBUF); 571 } 572 573 void 574 x86bios_init_regs(struct x86regs *regs) 575 { 576 577 bzero(regs, sizeof(*regs)); 578 regs->X86BIOS_R_SS = X86BIOS_PHYSTOSEG(x86bios_seg_phys); 579 regs->X86BIOS_R_SP = X86BIOS_PAGE_SIZE - 2; 580 } 581 582 void 583 x86bios_call(struct x86regs *regs, uint16_t seg, uint16_t off) 584 { 585 586 if (x86bios_trace_call) 587 X86BIOS_TRACE(Calling 0x%06x, (seg << 4) + off, regs); 588 589 mtx_lock(&x86bios_lock); 590 memcpy(&x86bios_emu.x86, regs, sizeof(*regs)); 591 x86bios_fault = 0; 592 spinlock_enter(); 593 x86emu_exec_call(&x86bios_emu, seg, off); 594 spinlock_exit(); 595 memcpy(regs, &x86bios_emu.x86, sizeof(*regs)); 596 mtx_unlock(&x86bios_lock); 597 598 if (x86bios_trace_call) { 599 X86BIOS_TRACE(Exiting 0x%06x, (seg << 4) + off, regs); 600 if (x86bios_fault) 601 printf("Page fault at 0x%06x from 0x%04x:0x%04x.\n", 602 x86bios_fault_addr, x86bios_fault_cs, 603 x86bios_fault_ip); 604 } 605 } 606 607 uint32_t 608 x86bios_get_intr(int intno) 609 { 610 611 return (le32toh(*((uint32_t *)x86bios_ivt + intno))); 612 } 613 614 void 615 x86bios_set_intr(int intno, uint32_t saddr) 616 { 617 618 *((uint32_t *)x86bios_ivt + intno) = htole32(saddr); 619 } 620 621 void 622 x86bios_intr(struct x86regs *regs, int intno) 623 { 624 625 if (intno < 0 || intno > 255) 626 return; 627 628 if (x86bios_trace_int) 629 X86BIOS_TRACE(Calling INT 0x%02x, intno, regs); 630 631 mtx_lock(&x86bios_lock); 632 memcpy(&x86bios_emu.x86, regs, sizeof(*regs)); 633 x86bios_fault = 0; 634 spinlock_enter(); 635 x86emu_exec_intr(&x86bios_emu, intno); 636 spinlock_exit(); 637 memcpy(regs, &x86bios_emu.x86, sizeof(*regs)); 638 mtx_unlock(&x86bios_lock); 639 640 if (x86bios_trace_int) { 641 X86BIOS_TRACE(Exiting INT 0x%02x, intno, regs); 642 if (x86bios_fault) 643 printf("Page fault at 0x%06x from 0x%04x:0x%04x.\n", 644 x86bios_fault_addr, x86bios_fault_cs, 645 x86bios_fault_ip); 646 } 647 } 648 649 void * 650 x86bios_offset(uint32_t offset) 651 { 652 653 return (x86bios_get_pages(offset, 1)); 654 } 655 656 static __inline void 657 x86bios_unmap_mem(void) 658 { 659 660 free(x86bios_map, M_DEVBUF); 661 if (x86bios_ivt != NULL) 662 #ifdef X86BIOS_NATIVE_ARCH 663 pmap_unmapbios((vm_offset_t)x86bios_ivt, X86BIOS_IVT_SIZE); 664 #else 665 free(x86bios_ivt, M_DEVBUF); 666 #endif 667 if (x86bios_rom != NULL) 668 pmap_unmapdev((vm_offset_t)x86bios_rom, X86BIOS_ROM_SIZE); 669 if (x86bios_seg != NULL) 670 contigfree(x86bios_seg, X86BIOS_SEG_SIZE, M_DEVBUF); 671 } 672 673 static __inline int 674 x86bios_map_mem(void) 675 { 676 677 x86bios_map = malloc(sizeof(*x86bios_map) * X86BIOS_PAGES, M_DEVBUF, 678 M_WAITOK | M_ZERO); 679 680 #ifdef X86BIOS_NATIVE_ARCH 681 x86bios_ivt = pmap_mapbios(X86BIOS_IVT_BASE, X86BIOS_IVT_SIZE); 682 683 /* Probe EBDA via BDA. */ 684 x86bios_rom_phys = *(uint16_t *)((caddr_t)x86bios_ivt + 0x40e); 685 x86bios_rom_phys = x86bios_rom_phys << 4; 686 if (x86bios_rom_phys != 0 && x86bios_rom_phys < X86BIOS_ROM_BASE && 687 X86BIOS_ROM_BASE - x86bios_rom_phys <= 128 * 1024) 688 x86bios_rom_phys = 689 rounddown(x86bios_rom_phys, X86BIOS_PAGE_SIZE); 690 else 691 #else 692 x86bios_ivt = malloc(X86BIOS_IVT_SIZE, M_DEVBUF, M_ZERO | M_WAITOK); 693 #endif 694 695 x86bios_rom_phys = X86BIOS_ROM_BASE; 696 x86bios_rom = pmap_mapdev(x86bios_rom_phys, X86BIOS_ROM_SIZE); 697 if (x86bios_rom == NULL) 698 goto fail; 699 #ifdef X86BIOS_NATIVE_ARCH 700 /* Change attribute for EBDA. */ 701 if (x86bios_rom_phys < X86BIOS_ROM_BASE && 702 pmap_change_attr((vm_offset_t)x86bios_rom, 703 X86BIOS_ROM_BASE - x86bios_rom_phys, PAT_WRITE_BACK) != 0) 704 goto fail; 705 #endif 706 707 x86bios_seg = contigmalloc(X86BIOS_SEG_SIZE, M_DEVBUF, M_WAITOK, 708 X86BIOS_RAM_BASE, x86bios_rom_phys, X86BIOS_PAGE_SIZE, 0); 709 x86bios_seg_phys = vtophys(x86bios_seg); 710 711 x86bios_set_pages((vm_offset_t)x86bios_ivt, X86BIOS_IVT_BASE, 712 X86BIOS_IVT_SIZE); 713 x86bios_set_pages((vm_offset_t)x86bios_rom, x86bios_rom_phys, 714 X86BIOS_ROM_SIZE); 715 x86bios_set_pages((vm_offset_t)x86bios_seg, x86bios_seg_phys, 716 X86BIOS_SEG_SIZE); 717 718 if (bootverbose) { 719 printf("x86bios: IVT 0x%06jx-0x%06jx at %p\n", 720 (vm_paddr_t)X86BIOS_IVT_BASE, 721 (vm_paddr_t)X86BIOS_IVT_SIZE + X86BIOS_IVT_BASE - 1, 722 x86bios_ivt); 723 printf("x86bios: SSEG 0x%06jx-0x%06jx at %p\n", 724 x86bios_seg_phys, 725 (vm_paddr_t)X86BIOS_SEG_SIZE + x86bios_seg_phys - 1, 726 x86bios_seg); 727 if (x86bios_rom_phys < X86BIOS_ROM_BASE) 728 printf("x86bios: EBDA 0x%06jx-0x%06jx at %p\n", 729 x86bios_rom_phys, (vm_paddr_t)X86BIOS_ROM_BASE - 1, 730 x86bios_rom); 731 printf("x86bios: ROM 0x%06jx-0x%06jx at %p\n", 732 (vm_paddr_t)X86BIOS_ROM_BASE, 733 (vm_paddr_t)X86BIOS_MEM_SIZE - X86BIOS_SEG_SIZE - 1, 734 (caddr_t)x86bios_rom + X86BIOS_ROM_BASE - x86bios_rom_phys); 735 } 736 737 return (0); 738 739 fail: 740 x86bios_unmap_mem(); 741 742 return (1); 743 } 744 745 static int 746 x86bios_init(void) 747 { 748 749 mtx_init(&x86bios_lock, "x86bios lock", NULL, MTX_DEF); 750 751 if (x86bios_map_mem() != 0) 752 return (ENOMEM); 753 754 bzero(&x86bios_emu, sizeof(x86bios_emu)); 755 756 x86bios_emu.emu_rdb = x86bios_emu_rdb; 757 x86bios_emu.emu_rdw = x86bios_emu_rdw; 758 x86bios_emu.emu_rdl = x86bios_emu_rdl; 759 x86bios_emu.emu_wrb = x86bios_emu_wrb; 760 x86bios_emu.emu_wrw = x86bios_emu_wrw; 761 x86bios_emu.emu_wrl = x86bios_emu_wrl; 762 763 x86bios_emu.emu_inb = x86bios_emu_inb; 764 x86bios_emu.emu_inw = x86bios_emu_inw; 765 x86bios_emu.emu_inl = x86bios_emu_inl; 766 x86bios_emu.emu_outb = x86bios_emu_outb; 767 x86bios_emu.emu_outw = x86bios_emu_outw; 768 x86bios_emu.emu_outl = x86bios_emu_outl; 769 770 return (0); 771 } 772 773 static int 774 x86bios_uninit(void) 775 { 776 777 x86bios_unmap_mem(); 778 mtx_destroy(&x86bios_lock); 779 780 return (0); 781 } 782 783 #endif 784 785 void * 786 x86bios_get_orm(uint32_t offset) 787 { 788 uint8_t *p; 789 790 /* Does the shadow ROM contain BIOS POST code for x86? */ 791 p = x86bios_offset(offset); 792 if (p == NULL || p[0] != 0x55 || p[1] != 0xaa || 793 (p[3] != 0xe9 && p[3] != 0xeb)) 794 return (NULL); 795 796 return (p); 797 } 798 799 int 800 x86bios_match_device(uint32_t offset, device_t dev) 801 { 802 uint8_t *p; 803 uint16_t device, vendor; 804 uint8_t class, progif, subclass; 805 806 /* Does the shadow ROM contain BIOS POST code for x86? */ 807 p = x86bios_get_orm(offset); 808 if (p == NULL) 809 return (0); 810 811 /* Does it contain PCI data structure? */ 812 p += le16toh(*(uint16_t *)(p + 0x18)); 813 if (bcmp(p, "PCIR", 4) != 0 || 814 le16toh(*(uint16_t *)(p + 0x0a)) < 0x18 || *(p + 0x14) != 0) 815 return (0); 816 817 /* Does it match the vendor, device, and classcode? */ 818 vendor = le16toh(*(uint16_t *)(p + 0x04)); 819 device = le16toh(*(uint16_t *)(p + 0x06)); 820 progif = *(p + 0x0d); 821 subclass = *(p + 0x0e); 822 class = *(p + 0x0f); 823 if (vendor != pci_get_vendor(dev) || device != pci_get_device(dev) || 824 class != pci_get_class(dev) || subclass != pci_get_subclass(dev) || 825 progif != pci_get_progif(dev)) 826 return (0); 827 828 return (1); 829 } 830 831 static int 832 x86bios_modevent(module_t mod __unused, int type, void *data __unused) 833 { 834 835 switch (type) { 836 case MOD_LOAD: 837 return (x86bios_init()); 838 case MOD_UNLOAD: 839 return (x86bios_uninit()); 840 default: 841 return (ENOTSUP); 842 } 843 } 844 845 static moduledata_t x86bios_mod = { 846 "x86bios", 847 x86bios_modevent, 848 NULL, 849 }; 850 851 DECLARE_MODULE(x86bios, x86bios_mod, SI_SUB_CPU, SI_ORDER_ANY); 852 MODULE_VERSION(x86bios, 1);
Cache object: 01d5aaf33e1a6feb5bfe2494c50416de
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