1 /* $OpenBSD: acpidump.c,v 1.16 2015/10/12 04:02:57 semarie Exp $ */ 2 /* 3 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@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 29 #include <sys/types.h> 30 #include <sys/mman.h> 31 #include <sys/queue.h> 32 #include <sys/stat.h> 33 #include <machine/biosvar.h> 34 35 #include <assert.h> 36 #include <err.h> 37 #include <fcntl.h> 38 #include <kvm.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 #include <limits.h> 44 45 46 #define vm_page_size sysconf(_SC_PAGESIZE) 47 #define PRINTFLAG(xx) \ 48 do { \ 49 if (facp->flags & ACPI_FACP_FLAG_## xx) { \ 50 fprintf(fhdr, "%c%s", sep, #xx); sep = ','; \ 51 } \ 52 } while (0) 53 54 55 typedef unsigned long vm_offset_t; 56 57 struct ACPIrsdp { 58 u_char signature[8]; 59 u_char sum; 60 u_char oem[6]; 61 u_char res; 62 u_int32_t addr; 63 } __packed; 64 65 struct ACPIsdt { 66 u_char signature[4]; 67 u_int32_t len; 68 u_char rev; 69 u_char check; 70 u_char oemid[6]; 71 u_char oemtblid[8]; 72 u_int32_t oemrev; 73 u_char creator[4]; 74 u_int32_t crerev; 75 #define SIZEOF_SDT_HDR 36 /* struct size except body */ 76 u_int32_t body[1];/* This member should be casted */ 77 } __packed; 78 79 struct ACPIgas { 80 u_int8_t address_space_id; 81 #define ACPI_GAS_MEMORY 0 82 #define ACPI_GAS_IO 1 83 #define ACPI_GAS_PCI 2 84 #define ACPI_GAS_EMBEDDED 3 85 #define ACPI_GAS_SMBUS 4 86 #define ACPI_GAS_FIXED 0x7f 87 u_int8_t register_bit_width; 88 u_int8_t register_bit_offset; 89 u_int8_t res; 90 u_int64_t address; 91 } __packed; 92 93 struct FACPbody { 94 u_int32_t facs_ptr; 95 u_int32_t dsdt_ptr; 96 u_int8_t int_model; 97 #define ACPI_FACP_INTMODEL_PIC 0 /* Standard PC-AT PIC */ 98 #define ACPI_FACP_INTMODEL_APIC 1 /* Multiple APIC */ 99 u_char reserved1; 100 u_int16_t sci_int; 101 u_int32_t smi_cmd; 102 u_int8_t acpi_enable; 103 u_int8_t acpi_disable; 104 u_int8_t s4biosreq; 105 u_int8_t reserved2; 106 u_int32_t pm1a_evt_blk; 107 u_int32_t pm1b_evt_blk; 108 u_int32_t pm1a_cnt_blk; 109 u_int32_t pm1b_cnt_blk; 110 u_int32_t pm2_cnt_blk; 111 u_int32_t pm_tmr_blk; 112 u_int32_t gpe0_blk; 113 u_int32_t gpe1_blk; 114 u_int8_t pm1_evt_len; 115 u_int8_t pm1_cnt_len; 116 u_int8_t pm2_cnt_len; 117 u_int8_t pm_tmr_len; 118 u_int8_t gpe0_len; 119 u_int8_t gpe1_len; 120 u_int8_t gpe1_base; 121 u_int8_t reserved3; 122 u_int16_t p_lvl2_lat; 123 u_int16_t p_lvl3_lat; 124 u_int16_t flush_size; 125 u_int16_t flush_stride; 126 u_int8_t duty_off; 127 u_int8_t duty_width; 128 u_int8_t day_alrm; 129 u_int8_t mon_alrm; 130 u_int8_t century; 131 u_int16_t iapc_boot_arch; 132 u_char reserved4[1]; 133 u_int32_t flags; 134 #define ACPI_FACP_FLAG_WBINVD 1 /* WBINVD is correctly supported */ 135 #define ACPI_FACP_FLAG_WBINVD_FLUSH 2 /* WBINVD flushes caches */ 136 #define ACPI_FACP_FLAG_PROC_C1 4 /* C1 power state supported */ 137 #define ACPI_FACP_FLAG_P_LVL2_UP 8 /* C2 power state works on SMP */ 138 #define ACPI_FACP_FLAG_PWR_BUTTON 16 /* Power button uses control method */ 139 #define ACPI_FACP_FLAG_SLP_BUTTON 32 /* Sleep button uses control method */ 140 #define ACPI_FACP_FLAG_FIX_RTC 64 /* RTC wakeup not supported */ 141 #define ACPI_FACP_FLAG_RTC_S4 128 /* RTC can wakeup from S4 state */ 142 #define ACPI_FACP_FLAG_TMR_VAL_EXT 256 /* TMR_VAL is 32bit */ 143 #define ACPI_FACP_FLAG_DCK_CAP 512 /* Can support docking */ 144 struct ACPIgas reset_reg; 145 u_int8_t reset_value; 146 u_int8_t reserved5[3]; 147 u_int64_t x_firmware_ctrl; 148 u_int64_t x_dsdt; 149 struct ACPIgas x_pm1a_evt_blk; 150 struct ACPIgas x_pm1b_evt_blk; 151 struct ACPIgas x_pm1a_cnt_blk; 152 struct ACPIgas x_pm1b_cnt_blk; 153 struct ACPIgas x_pm2_cnt_blk; 154 struct ACPIgas x_pm_tmr_blk; 155 struct ACPIgas x_gpe0_blk; 156 struct ACPIgas x_gpe1_blk; 157 } __packed; 158 159 struct acpi_user_mapping { 160 LIST_ENTRY(acpi_user_mapping) link; 161 vm_offset_t pa; 162 caddr_t va; 163 size_t size; 164 }; 165 166 LIST_HEAD(acpi_user_mapping_list, acpi_user_mapping) maplist; 167 168 int acpi_mem_fd = -1; 169 char *aml_dumpfile; 170 FILE *fhdr; 171 172 int acpi_checksum(void *_p, size_t _length); 173 struct acpi_user_mapping *acpi_user_find_mapping(vm_offset_t _pa, size_t _size); 174 void *acpi_map_physical(vm_offset_t _pa, size_t _size); 175 void acpi_user_init(void); 176 struct ACPIrsdp *acpi_find_rsd_ptr(void); 177 void acpi_print_string(char *_s, size_t _length); 178 void acpi_print_rsd_ptr(struct ACPIrsdp *_rp); 179 struct ACPIsdt *acpi_map_sdt(vm_offset_t _pa); 180 void aml_dump(struct ACPIsdt *_hdr); 181 void acpi_print_sdt(struct ACPIsdt *_sdp); 182 void acpi_print_rsdt(struct ACPIsdt *_rsdp); 183 void acpi_print_facp(struct FACPbody *_facp); 184 void acpi_print_dsdt(struct ACPIsdt *_dsdp); 185 void acpi_handle_dsdt(struct ACPIsdt *_dsdp); 186 void acpi_handle_facp(struct FACPbody *_facp); 187 void acpi_handle_rsdt(struct ACPIsdt *_rsdp); 188 void asl_dump_from_devmem(void); 189 void usage(void); 190 u_long bios_acpi_addr(void); 191 192 193 struct ACPIsdt dsdt_header = { 194 "DSDT", 0, 1, 0, "OEMID", "OEMTBLID", 0x12345678, "CRTR", 0x12345678 195 }; 196 197 int 198 acpi_checksum(void *p, size_t length) 199 { 200 u_int8_t *bp; 201 u_int8_t sum; 202 203 bp = p; 204 sum = 0; 205 while (length--) 206 sum += *bp++; 207 208 return (sum); 209 } 210 211 struct acpi_user_mapping * 212 acpi_user_find_mapping(vm_offset_t pa, size_t size) 213 { 214 struct acpi_user_mapping *map; 215 int page_mask = getpagesize() - 1; 216 217 /* First search for an existing mapping */ 218 for (map = LIST_FIRST(&maplist); map; map = LIST_NEXT(map, link)) { 219 if (map->pa <= pa && map->size >= pa + size - map->pa) 220 return (map); 221 } 222 223 /* Then create a new one */ 224 #undef round_page 225 #undef trunc_page 226 #define round_page(x) (((x) + page_mask) & ~page_mask) 227 #define trunc_page(x) ((x) & ~page_mask) 228 size = round_page(pa + size) - trunc_page(pa); 229 pa = trunc_page(pa); 230 #undef round_page 231 #undef trunc_page 232 map = malloc(sizeof(struct acpi_user_mapping)); 233 if (!map) 234 errx(1, "out of memory"); 235 map->pa = pa; 236 map->va = mmap(0, size, PROT_READ, MAP_SHARED, acpi_mem_fd, pa); 237 map->size = size; 238 if (map->va == MAP_FAILED) 239 err(1, "can't map address"); 240 LIST_INSERT_HEAD(&maplist, map, link); 241 242 return (map); 243 } 244 245 void * 246 acpi_map_physical(vm_offset_t pa, size_t size) 247 { 248 struct acpi_user_mapping *map; 249 250 map = acpi_user_find_mapping(pa, size); 251 return (map->va + (pa - map->pa)); 252 } 253 254 void 255 acpi_user_init(void) 256 { 257 if (acpi_mem_fd == -1) { 258 acpi_mem_fd = open("/dev/mem", O_RDONLY); 259 if (acpi_mem_fd == -1) 260 err(1, "opening /dev/mem"); 261 LIST_INIT(&maplist); 262 } 263 } 264 265 struct ACPIrsdp * 266 acpi_find_rsd_ptr(void) 267 { 268 int i; 269 u_int8_t buf[sizeof(struct ACPIrsdp)]; 270 u_long addr; 271 272 if ((addr = bios_acpi_addr()) != 0) { 273 lseek(acpi_mem_fd, addr, SEEK_SET); 274 read(acpi_mem_fd, buf, 16); 275 if (!memcmp(buf, "RSD PTR ", 8)) { 276 read(acpi_mem_fd, buf + 16, 277 sizeof(struct ACPIrsdp) - 16); 278 if (!acpi_checksum(buf, sizeof(struct ACPIrsdp))) 279 return (acpi_map_physical(addr, 280 sizeof(struct ACPIrsdp))); 281 } 282 lseek(acpi_mem_fd, 0, SEEK_SET); 283 } 284 for (i = 0; i < 1024 * 1024; i += 16) { 285 lseek(acpi_mem_fd, i, SEEK_SET); 286 read(acpi_mem_fd, buf, 16); 287 if (!memcmp(buf, "RSD PTR ", 8)) { 288 /* Read the rest of the structure */ 289 read(acpi_mem_fd, buf + 16, 290 sizeof(struct ACPIrsdp) - 16); 291 292 /* Verify checksum before accepting it. */ 293 if (acpi_checksum(buf, sizeof(struct ACPIrsdp))) 294 continue; 295 296 return (acpi_map_physical(i, sizeof(struct ACPIrsdp))); 297 } 298 } 299 300 return (0); 301 } 302 303 void 304 acpi_print_string(char *s, size_t length) 305 { 306 int c; 307 308 /* Trim trailing spaces and NULLs */ 309 while (length > 0 && (s[length - 1] == ' ' || s[length - 1] == '\0')) 310 length--; 311 312 while (length--) { 313 c = *s++; 314 fputc(c, fhdr); 315 } 316 } 317 318 void 319 acpi_print_rsd_ptr(struct ACPIrsdp *rp) 320 { 321 fprintf(fhdr, "\n"); 322 fprintf(fhdr, "RSD PTR: Checksum=%d, OEMID=", rp->sum); 323 acpi_print_string(rp->oem, 6); 324 fprintf(fhdr, ", RsdtAddress=0x%08x\n", rp->addr); 325 fprintf(fhdr, "\n"); 326 } 327 328 struct ACPIsdt * 329 acpi_map_sdt(vm_offset_t pa) 330 { 331 struct ACPIsdt *sp; 332 333 sp = acpi_map_physical(pa, sizeof(struct ACPIsdt)); 334 sp = acpi_map_physical(pa, sp->len); 335 return (sp); 336 } 337 338 void 339 aml_dump(struct ACPIsdt *hdr) 340 { 341 static int hdr_index; 342 char name[PATH_MAX]; 343 int fd; 344 mode_t mode; 345 346 snprintf(name, sizeof(name), "%s.%c%c%c%c.%d", 347 aml_dumpfile, hdr->signature[0], hdr->signature[1], 348 hdr->signature[2], hdr->signature[3], 349 hdr_index++); 350 351 mode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 352 fd = open(name, O_WRONLY | O_CREAT | O_TRUNC, mode); 353 if (fd == -1) 354 err(1, "aml_dump"); 355 356 write(fd, hdr, SIZEOF_SDT_HDR); 357 write(fd, hdr->body, hdr->len - SIZEOF_SDT_HDR); 358 close(fd); 359 } 360 361 void 362 acpi_print_sdt(struct ACPIsdt *sdp) 363 { 364 fprintf(fhdr, "\n"); 365 acpi_print_string(sdp->signature, 4); 366 fprintf(fhdr, ": Length=%d, Revision=%d, Checksum=%d,\n", 367 sdp->len, sdp->rev, sdp->check); 368 fprintf(fhdr, "\tOEMID="); 369 acpi_print_string(sdp->oemid, 6); 370 fprintf(fhdr, ", OEM Table ID="); 371 acpi_print_string(sdp->oemtblid, 8); 372 fprintf(fhdr, ", OEM Revision=0x%x,\n", sdp->oemrev); 373 fprintf(fhdr, "\tCreator ID="); 374 acpi_print_string(sdp->creator, 4); 375 fprintf(fhdr, ", Creator Revision=0x%x\n", sdp->crerev); 376 fprintf(fhdr, "\n"); 377 if (!memcmp(sdp->signature, "DSDT", 4)) 378 memcpy(&dsdt_header, sdp, sizeof(dsdt_header)); 379 } 380 381 void 382 acpi_print_rsdt(struct ACPIsdt *rsdp) 383 { 384 int i, entries; 385 386 acpi_print_sdt(rsdp); 387 entries = (rsdp->len - SIZEOF_SDT_HDR) / sizeof(u_int32_t); 388 fprintf(fhdr, "\n"); 389 fprintf(fhdr, "\tEntries={ "); 390 for (i = 0; i < entries; i++) { 391 if (i > 0) 392 fprintf(fhdr, ", "); 393 fprintf(fhdr, "0x%08x", rsdp->body[i]); 394 } 395 fprintf(fhdr, " }\n"); 396 fprintf(fhdr, "\n"); 397 } 398 399 void 400 acpi_print_facp(struct FACPbody *facp) 401 { 402 char sep; 403 404 fprintf(fhdr, "\n"); 405 fprintf(fhdr, "\tDSDT=0x%x\n", facp->dsdt_ptr); 406 fprintf(fhdr, "\tINT_MODEL=%s\n", facp->int_model ? "APIC" : "PIC"); 407 fprintf(fhdr, "\tSCI_INT=%d\n", facp->sci_int); 408 fprintf(fhdr, "\tSMI_CMD=0x%x, ", facp->smi_cmd); 409 fprintf(fhdr, "ACPI_ENABLE=0x%x, ", facp->acpi_enable); 410 fprintf(fhdr, "ACPI_DISABLE=0x%x, ", facp->acpi_disable); 411 fprintf(fhdr, "S4BIOS_REQ=0x%x\n", facp->s4biosreq); 412 if (facp->pm1a_evt_blk) 413 fprintf(fhdr, "\tPM1a_EVT_BLK=0x%x-0x%x\n", 414 facp->pm1a_evt_blk, 415 facp->pm1a_evt_blk + facp->pm1_evt_len - 1); 416 if (facp->pm1b_evt_blk) 417 fprintf(fhdr, "\tPM1b_EVT_BLK=0x%x-0x%x\n", 418 facp->pm1b_evt_blk, 419 facp->pm1b_evt_blk + facp->pm1_evt_len - 1); 420 if (facp->pm1a_cnt_blk) 421 fprintf(fhdr, "\tPM1a_CNT_BLK=0x%x-0x%x\n", 422 facp->pm1a_cnt_blk, 423 facp->pm1a_cnt_blk + facp->pm1_cnt_len - 1); 424 if (facp->pm1b_cnt_blk) 425 fprintf(fhdr, "\tPM1b_CNT_BLK=0x%x-0x%x\n", 426 facp->pm1b_cnt_blk, 427 facp->pm1b_cnt_blk + facp->pm1_cnt_len - 1); 428 if (facp->pm2_cnt_blk) 429 fprintf(fhdr, "\tPM2_CNT_BLK=0x%x-0x%x\n", 430 facp->pm2_cnt_blk, 431 facp->pm2_cnt_blk + facp->pm2_cnt_len - 1); 432 if (facp->pm_tmr_blk) 433 fprintf(fhdr, "\tPM2_TMR_BLK=0x%x-0x%x\n", 434 facp->pm_tmr_blk, 435 facp->pm_tmr_blk + facp->pm_tmr_len - 1); 436 if (facp->gpe0_blk) 437 fprintf(fhdr, "\tPM2_GPE0_BLK=0x%x-0x%x\n", 438 facp->gpe0_blk, 439 facp->gpe0_blk + facp->gpe0_len - 1); 440 if (facp->gpe1_blk) 441 fprintf(fhdr, "\tPM2_GPE1_BLK=0x%x-0x%x, GPE1_BASE=%d\n", 442 facp->gpe1_blk, 443 facp->gpe1_blk + facp->gpe1_len - 1, 444 facp->gpe1_base); 445 fprintf(fhdr, "\tP_LVL2_LAT=%dms, P_LVL3_LAT=%dms\n", 446 facp->p_lvl2_lat, facp->p_lvl3_lat); 447 fprintf(fhdr, "\tFLUSH_SIZE=%d, FLUSH_STRIDE=%d\n", 448 facp->flush_size, facp->flush_stride); 449 fprintf(fhdr, "\tDUTY_OFFSET=%d, DUTY_WIDTH=%d\n", 450 facp->duty_off, facp->duty_width); 451 fprintf(fhdr, "\tDAY_ALRM=%d, MON_ALRM=%d, CENTURY=%d\n", 452 facp->day_alrm, facp->mon_alrm, facp->century); 453 fprintf(fhdr, "\tFlags="); 454 sep = '{'; 455 456 PRINTFLAG(WBINVD); 457 PRINTFLAG(WBINVD_FLUSH); 458 PRINTFLAG(PROC_C1); 459 PRINTFLAG(P_LVL2_UP); 460 PRINTFLAG(PWR_BUTTON); 461 PRINTFLAG(SLP_BUTTON); 462 PRINTFLAG(FIX_RTC); 463 PRINTFLAG(RTC_S4); 464 PRINTFLAG(TMR_VAL_EXT); 465 PRINTFLAG(DCK_CAP); 466 467 fprintf(fhdr, "}\n"); 468 fprintf(fhdr, "\n"); 469 } 470 471 void 472 acpi_print_dsdt(struct ACPIsdt *dsdp) 473 { 474 acpi_print_sdt(dsdp); 475 } 476 477 void 478 acpi_handle_dsdt(struct ACPIsdt *dsdp) 479 { 480 u_int8_t *dp; 481 u_int8_t *end; 482 483 acpi_print_dsdt(dsdp); 484 485 dp = (u_int8_t *)dsdp->body; 486 end = (u_int8_t *)dsdp + dsdp->len; 487 } 488 489 void 490 acpi_handle_facp(struct FACPbody *facp) 491 { 492 struct ACPIsdt *dsdp; 493 494 acpi_print_facp(facp); 495 dsdp = (struct ACPIsdt *) acpi_map_sdt(facp->dsdt_ptr); 496 if (acpi_checksum(dsdp, dsdp->len)) 497 errx(1, "DSDT is corrupt"); 498 acpi_handle_dsdt(dsdp); 499 aml_dump(dsdp); 500 } 501 502 void 503 acpi_handle_rsdt(struct ACPIsdt *rsdp) 504 { 505 int i; 506 int entries; 507 struct ACPIsdt *sdp; 508 509 aml_dump(rsdp); 510 entries = (rsdp->len - SIZEOF_SDT_HDR) / sizeof(u_int32_t); 511 acpi_print_rsdt(rsdp); 512 for (i = 0; i < entries; i++) { 513 sdp = (struct ACPIsdt *) acpi_map_sdt(rsdp->body[i]); 514 if (acpi_checksum(sdp, sdp->len)) 515 errx(1, "RSDT entry %d is corrupt", i); 516 aml_dump(sdp); 517 if (!memcmp(sdp->signature, "FACP", 4)) { 518 acpi_handle_facp((struct FACPbody *) sdp->body); 519 } else { 520 acpi_print_sdt(sdp); 521 } 522 } 523 } 524 525 void 526 asl_dump_from_devmem(void) 527 { 528 struct ACPIrsdp *rp; 529 struct ACPIsdt *rsdp; 530 char name[PATH_MAX]; 531 532 snprintf(name, sizeof(name), "%s.headers", aml_dumpfile); 533 534 acpi_user_init(); 535 536 if (pledge("stdio rpath wpath cpath", NULL) == -1) 537 err(1, "pledge"); 538 539 rp = acpi_find_rsd_ptr(); 540 if (!rp) 541 errx(1, "Can't find ACPI information"); 542 543 fhdr = fopen(name, "w"); 544 if (fhdr == NULL) 545 err(1, "asl_dump_from_devmem"); 546 547 acpi_print_rsd_ptr(rp); 548 rsdp = (struct ACPIsdt *) acpi_map_sdt(rp->addr); 549 if (memcmp(rsdp->signature, "RSDT", 4) || 550 acpi_checksum(rsdp, rsdp->len)) 551 errx(1, "RSDT is corrupted"); 552 553 acpi_handle_rsdt(rsdp); 554 555 fclose(fhdr); 556 } 557 558 void 559 usage(void) 560 { 561 extern char *__progname; 562 563 fprintf(stderr, "usage: %s -o prefix_for_output\n", __progname); 564 exit(1); 565 } 566 567 int 568 main(int argc, char *argv[]) 569 { 570 char c; 571 572 while ((c = getopt(argc, argv, "o:")) != -1) { 573 switch (c) { 574 case 'o': 575 aml_dumpfile = optarg; 576 break; 577 default: 578 usage(); 579 break; 580 } 581 } 582 583 if (aml_dumpfile == NULL) 584 usage(); 585 586 asl_dump_from_devmem(); 587 588 return (0); 589 } 590 591 u_long 592 bios_acpi_addr(void) 593 { 594 kvm_t *kd; 595 struct nlist nl[2]; 596 bios_efiinfo_t efiinfo; 597 u_long ptr; 598 599 memset(&nl, 0, sizeof(nl)); 600 kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, NULL); 601 if (kd == NULL) 602 goto on_error; 603 nl[0].n_name = "_bios_efiinfo"; 604 if (kvm_nlist(kd, nl) == -1) 605 goto on_error; 606 if (kvm_read(kd, nl[0].n_value, &ptr, sizeof(ptr)) == -1) 607 goto on_error; 608 if (kvm_read(kd, ptr, &efiinfo, sizeof(efiinfo)) == -1) 609 goto on_error; 610 611 kvm_close(kd); 612 return (efiinfo.config_acpi); 613 614 on_error: 615 if (kd != NULL) 616 kvm_close(kd); 617 return (0); 618 } 619