Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/efidev/efirt.c
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1 /*- 2 * Copyright (c) 2004 Marcel Moolenaar 3 * Copyright (c) 2001 Doug Rabson 4 * Copyright (c) 2016, 2018 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * Portions of this software were developed by Konstantin Belousov 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/efi.h> 37 #include <sys/eventhandler.h> 38 #include <sys/kernel.h> 39 #include <sys/linker.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/module.h> 43 #include <sys/msan.h> 44 #include <sys/mutex.h> 45 #include <sys/clock.h> 46 #include <sys/proc.h> 47 #include <sys/reboot.h> 48 #include <sys/rwlock.h> 49 #include <sys/sched.h> 50 #include <sys/sysctl.h> 51 #include <sys/systm.h> 52 #include <sys/uio.h> 53 #include <sys/vmmeter.h> 54 55 #include <machine/fpu.h> 56 #include <machine/efi.h> 57 #include <machine/metadata.h> 58 #include <machine/vmparam.h> 59 60 #include <vm/vm.h> 61 #include <vm/pmap.h> 62 #include <vm/vm_map.h> 63 64 #define EFI_TABLE_ALLOC_MAX 0x800000 65 66 static struct efi_systbl *efi_systbl; 67 static eventhandler_tag efi_shutdown_tag; 68 /* 69 * The following pointers point to tables in the EFI runtime service data pages. 70 * Care should be taken to make sure that we've properly entered the EFI runtime 71 * environment (efi_enter()) before dereferencing them. 72 */ 73 static struct efi_cfgtbl *efi_cfgtbl; 74 static struct efi_rt *efi_runtime; 75 76 static int efi_status2err[25] = { 77 0, /* EFI_SUCCESS */ 78 ENOEXEC, /* EFI_LOAD_ERROR */ 79 EINVAL, /* EFI_INVALID_PARAMETER */ 80 ENOSYS, /* EFI_UNSUPPORTED */ 81 EMSGSIZE, /* EFI_BAD_BUFFER_SIZE */ 82 EOVERFLOW, /* EFI_BUFFER_TOO_SMALL */ 83 EBUSY, /* EFI_NOT_READY */ 84 EIO, /* EFI_DEVICE_ERROR */ 85 EROFS, /* EFI_WRITE_PROTECTED */ 86 EAGAIN, /* EFI_OUT_OF_RESOURCES */ 87 EIO, /* EFI_VOLUME_CORRUPTED */ 88 ENOSPC, /* EFI_VOLUME_FULL */ 89 ENXIO, /* EFI_NO_MEDIA */ 90 ESTALE, /* EFI_MEDIA_CHANGED */ 91 ENOENT, /* EFI_NOT_FOUND */ 92 EACCES, /* EFI_ACCESS_DENIED */ 93 ETIMEDOUT, /* EFI_NO_RESPONSE */ 94 EADDRNOTAVAIL, /* EFI_NO_MAPPING */ 95 ETIMEDOUT, /* EFI_TIMEOUT */ 96 EDOOFUS, /* EFI_NOT_STARTED */ 97 EALREADY, /* EFI_ALREADY_STARTED */ 98 ECANCELED, /* EFI_ABORTED */ 99 EPROTO, /* EFI_ICMP_ERROR */ 100 EPROTO, /* EFI_TFTP_ERROR */ 101 EPROTO /* EFI_PROTOCOL_ERROR */ 102 }; 103 104 enum efi_table_type { 105 TYPE_ESRT = 0, 106 TYPE_PROP 107 }; 108 109 static int efi_enter(void); 110 static void efi_leave(void); 111 112 int 113 efi_status_to_errno(efi_status status) 114 { 115 u_long code; 116 117 code = status & 0x3ffffffffffffffful; 118 return (code < nitems(efi_status2err) ? efi_status2err[code] : EDOOFUS); 119 } 120 121 static struct mtx efi_lock; 122 static SYSCTL_NODE(_hw, OID_AUTO, efi, CTLFLAG_RWTUN | CTLFLAG_MPSAFE, NULL, 123 "EFI"); 124 static bool efi_poweroff = true; 125 SYSCTL_BOOL(_hw_efi, OID_AUTO, poweroff, CTLFLAG_RWTUN, &efi_poweroff, 0, 126 "If true, use EFI runtime services to power off in preference to ACPI"); 127 128 static bool 129 efi_is_in_map(struct efi_md *map, int ndesc, int descsz, vm_offset_t addr) 130 { 131 struct efi_md *p; 132 int i; 133 134 for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p, 135 descsz)) { 136 if ((p->md_attr & EFI_MD_ATTR_RT) == 0) 137 continue; 138 139 if (addr >= p->md_virt && 140 addr < p->md_virt + p->md_pages * EFI_PAGE_SIZE) 141 return (true); 142 } 143 144 return (false); 145 } 146 147 static void 148 efi_shutdown_final(void *dummy __unused, int howto) 149 { 150 151 /* 152 * On some systems, ACPI S5 is missing or does not function properly. 153 * When present, shutdown via EFI Runtime Services instead, unless 154 * disabled. 155 */ 156 if ((howto & RB_POWEROFF) != 0 && efi_poweroff) 157 (void)efi_reset_system(EFI_RESET_SHUTDOWN); 158 } 159 160 static int 161 efi_init(void) 162 { 163 struct efi_map_header *efihdr; 164 struct efi_md *map; 165 struct efi_rt *rtdm; 166 caddr_t kmdp; 167 size_t efisz; 168 int ndesc, rt_disabled; 169 170 rt_disabled = 0; 171 TUNABLE_INT_FETCH("efi.rt.disabled", &rt_disabled); 172 if (rt_disabled == 1) 173 return (0); 174 mtx_init(&efi_lock, "efi", NULL, MTX_DEF); 175 176 if (efi_systbl_phys == 0) { 177 if (bootverbose) 178 printf("EFI systbl not available\n"); 179 return (0); 180 } 181 182 efi_systbl = (struct efi_systbl *)efi_phys_to_kva(efi_systbl_phys); 183 if (efi_systbl == NULL || efi_systbl->st_hdr.th_sig != EFI_SYSTBL_SIG) { 184 efi_systbl = NULL; 185 if (bootverbose) 186 printf("EFI systbl signature invalid\n"); 187 return (0); 188 } 189 efi_cfgtbl = (efi_systbl->st_cfgtbl == 0) ? NULL : 190 (struct efi_cfgtbl *)efi_systbl->st_cfgtbl; 191 if (efi_cfgtbl == NULL) { 192 if (bootverbose) 193 printf("EFI config table is not present\n"); 194 } 195 196 kmdp = preload_search_by_type("elf kernel"); 197 if (kmdp == NULL) 198 kmdp = preload_search_by_type("elf64 kernel"); 199 efihdr = (struct efi_map_header *)preload_search_info(kmdp, 200 MODINFO_METADATA | MODINFOMD_EFI_MAP); 201 if (efihdr == NULL) { 202 if (bootverbose) 203 printf("EFI map is not present\n"); 204 return (0); 205 } 206 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf; 207 map = (struct efi_md *)((uint8_t *)efihdr + efisz); 208 if (efihdr->descriptor_size == 0) 209 return (ENOMEM); 210 211 ndesc = efihdr->memory_size / efihdr->descriptor_size; 212 if (!efi_create_1t1_map(map, ndesc, efihdr->descriptor_size)) { 213 if (bootverbose) 214 printf("EFI cannot create runtime map\n"); 215 return (ENOMEM); 216 } 217 218 efi_runtime = (efi_systbl->st_rt == 0) ? NULL : 219 (struct efi_rt *)efi_systbl->st_rt; 220 if (efi_runtime == NULL) { 221 if (bootverbose) 222 printf("EFI runtime services table is not present\n"); 223 efi_destroy_1t1_map(); 224 return (ENXIO); 225 } 226 227 #if defined(__aarch64__) || defined(__amd64__) 228 /* 229 * Some UEFI implementations have multiple implementations of the 230 * RS->GetTime function. They switch from one we can only use early 231 * in the boot process to one valid as a RunTime service only when we 232 * call RS->SetVirtualAddressMap. As this is not always the case, e.g. 233 * with an old loader.efi, check if the RS->GetTime function is within 234 * the EFI map, and fail to attach if not. 235 */ 236 rtdm = (struct efi_rt *)efi_phys_to_kva((uintptr_t)efi_runtime); 237 if (rtdm == NULL || !efi_is_in_map(map, ndesc, efihdr->descriptor_size, 238 (vm_offset_t)rtdm->rt_gettime)) { 239 if (bootverbose) 240 printf( 241 "EFI runtime services table has an invalid pointer\n"); 242 efi_runtime = NULL; 243 efi_destroy_1t1_map(); 244 return (ENXIO); 245 } 246 #endif 247 248 /* 249 * We use SHUTDOWN_PRI_LAST - 1 to trigger after IPMI, but before ACPI. 250 */ 251 efi_shutdown_tag = EVENTHANDLER_REGISTER(shutdown_final, 252 efi_shutdown_final, NULL, SHUTDOWN_PRI_LAST - 1); 253 254 return (0); 255 } 256 257 static void 258 efi_uninit(void) 259 { 260 261 /* Most likely disabled by tunable */ 262 if (efi_runtime == NULL) 263 return; 264 if (efi_shutdown_tag != NULL) 265 EVENTHANDLER_DEREGISTER(shutdown_final, efi_shutdown_tag); 266 efi_destroy_1t1_map(); 267 268 efi_systbl = NULL; 269 efi_cfgtbl = NULL; 270 efi_runtime = NULL; 271 272 mtx_destroy(&efi_lock); 273 } 274 275 static int 276 rt_ok(void) 277 { 278 279 if (efi_runtime == NULL) 280 return (ENXIO); 281 return (0); 282 } 283 284 static int 285 efi_enter(void) 286 { 287 struct thread *td; 288 pmap_t curpmap; 289 int error; 290 291 if (efi_runtime == NULL) 292 return (ENXIO); 293 td = curthread; 294 curpmap = &td->td_proc->p_vmspace->vm_pmap; 295 PMAP_LOCK(curpmap); 296 mtx_lock(&efi_lock); 297 fpu_kern_enter(td, NULL, FPU_KERN_NOCTX); 298 error = efi_arch_enter(); 299 if (error != 0) { 300 fpu_kern_leave(td, NULL); 301 mtx_unlock(&efi_lock); 302 PMAP_UNLOCK(curpmap); 303 } 304 return (error); 305 } 306 307 static void 308 efi_leave(void) 309 { 310 struct thread *td; 311 pmap_t curpmap; 312 313 efi_arch_leave(); 314 315 curpmap = &curproc->p_vmspace->vm_pmap; 316 td = curthread; 317 fpu_kern_leave(td, NULL); 318 mtx_unlock(&efi_lock); 319 PMAP_UNLOCK(curpmap); 320 } 321 322 static int 323 get_table(struct uuid *uuid, void **ptr) 324 { 325 struct efi_cfgtbl *ct; 326 u_long count; 327 int error; 328 329 if (efi_cfgtbl == NULL || efi_systbl == NULL) 330 return (ENXIO); 331 error = efi_enter(); 332 if (error != 0) 333 return (error); 334 count = efi_systbl->st_entries; 335 ct = efi_cfgtbl; 336 while (count--) { 337 if (!bcmp(&ct->ct_uuid, uuid, sizeof(*uuid))) { 338 *ptr = ct->ct_data; 339 efi_leave(); 340 return (0); 341 } 342 ct++; 343 } 344 345 efi_leave(); 346 return (ENOENT); 347 } 348 349 static int 350 get_table_length(enum efi_table_type type, size_t *table_len, void **taddr) 351 { 352 switch (type) { 353 case TYPE_ESRT: 354 { 355 struct efi_esrt_table *esrt = NULL; 356 struct uuid uuid = EFI_TABLE_ESRT; 357 uint32_t fw_resource_count = 0; 358 size_t len = sizeof(*esrt); 359 int error; 360 void *buf; 361 362 error = efi_get_table(&uuid, (void **)&esrt); 363 if (error != 0) 364 return (error); 365 366 buf = malloc(len, M_TEMP, M_WAITOK); 367 error = physcopyout((vm_paddr_t)esrt, buf, len); 368 if (error != 0) { 369 free(buf, M_TEMP); 370 return (error); 371 } 372 373 /* Check ESRT version */ 374 if (((struct efi_esrt_table *)buf)->fw_resource_version != 375 ESRT_FIRMWARE_RESOURCE_VERSION) { 376 free(buf, M_TEMP); 377 return (ENODEV); 378 } 379 380 fw_resource_count = ((struct efi_esrt_table *)buf)-> 381 fw_resource_count; 382 if (fw_resource_count > EFI_TABLE_ALLOC_MAX / 383 sizeof(struct efi_esrt_entry_v1)) { 384 free(buf, M_TEMP); 385 return (ENOMEM); 386 } 387 388 len += fw_resource_count * sizeof(struct efi_esrt_entry_v1); 389 *table_len = len; 390 391 if (taddr != NULL) 392 *taddr = esrt; 393 free(buf, M_TEMP); 394 return (0); 395 } 396 case TYPE_PROP: 397 { 398 struct uuid uuid = EFI_PROPERTIES_TABLE; 399 struct efi_prop_table *prop; 400 size_t len = sizeof(*prop); 401 uint32_t prop_len; 402 int error; 403 void *buf; 404 405 error = efi_get_table(&uuid, (void **)&prop); 406 if (error != 0) 407 return (error); 408 409 buf = malloc(len, M_TEMP, M_WAITOK); 410 error = physcopyout((vm_paddr_t)prop, buf, len); 411 if (error != 0) { 412 free(buf, M_TEMP); 413 return (error); 414 } 415 416 prop_len = ((struct efi_prop_table *)buf)->length; 417 if (prop_len > EFI_TABLE_ALLOC_MAX) { 418 free(buf, M_TEMP); 419 return (ENOMEM); 420 } 421 *table_len = prop_len; 422 423 if (taddr != NULL) 424 *taddr = prop; 425 free(buf, M_TEMP); 426 return (0); 427 } 428 } 429 return (ENOENT); 430 } 431 432 static int 433 copy_table(struct uuid *uuid, void **buf, size_t buf_len, size_t *table_len) 434 { 435 static const struct known_table { 436 struct uuid uuid; 437 enum efi_table_type type; 438 } tables[] = { 439 { EFI_TABLE_ESRT, TYPE_ESRT }, 440 { EFI_PROPERTIES_TABLE, TYPE_PROP } 441 }; 442 size_t table_idx; 443 void *taddr; 444 int rc; 445 446 for (table_idx = 0; table_idx < nitems(tables); table_idx++) { 447 if (!bcmp(&tables[table_idx].uuid, uuid, sizeof(*uuid))) 448 break; 449 } 450 451 if (table_idx == nitems(tables)) 452 return (EINVAL); 453 454 rc = get_table_length(tables[table_idx].type, table_len, &taddr); 455 if (rc != 0) 456 return rc; 457 458 /* return table length to userspace */ 459 if (buf == NULL) 460 return (0); 461 462 *buf = malloc(*table_len, M_TEMP, M_WAITOK); 463 rc = physcopyout((vm_paddr_t)taddr, *buf, *table_len); 464 return (rc); 465 } 466 467 static int efi_rt_handle_faults = EFI_RT_HANDLE_FAULTS_DEFAULT; 468 SYSCTL_INT(_machdep, OID_AUTO, efi_rt_handle_faults, CTLFLAG_RWTUN, 469 &efi_rt_handle_faults, 0, 470 "Call EFI RT methods with fault handler wrapper around"); 471 472 static int 473 efi_rt_arch_call_nofault(struct efirt_callinfo *ec) 474 { 475 476 switch (ec->ec_argcnt) { 477 case 0: 478 ec->ec_efi_status = ((register_t (*)(void))ec->ec_fptr)(); 479 break; 480 case 1: 481 ec->ec_efi_status = ((register_t (*)(register_t))ec->ec_fptr) 482 (ec->ec_arg1); 483 break; 484 case 2: 485 ec->ec_efi_status = ((register_t (*)(register_t, register_t)) 486 ec->ec_fptr)(ec->ec_arg1, ec->ec_arg2); 487 break; 488 case 3: 489 ec->ec_efi_status = ((register_t (*)(register_t, register_t, 490 register_t))ec->ec_fptr)(ec->ec_arg1, ec->ec_arg2, 491 ec->ec_arg3); 492 break; 493 case 4: 494 ec->ec_efi_status = ((register_t (*)(register_t, register_t, 495 register_t, register_t))ec->ec_fptr)(ec->ec_arg1, 496 ec->ec_arg2, ec->ec_arg3, ec->ec_arg4); 497 break; 498 case 5: 499 ec->ec_efi_status = ((register_t (*)(register_t, register_t, 500 register_t, register_t, register_t))ec->ec_fptr)( 501 ec->ec_arg1, ec->ec_arg2, ec->ec_arg3, ec->ec_arg4, 502 ec->ec_arg5); 503 break; 504 default: 505 panic("efi_rt_arch_call: %d args", (int)ec->ec_argcnt); 506 } 507 508 return (0); 509 } 510 511 static int 512 efi_call(struct efirt_callinfo *ecp) 513 { 514 int error; 515 516 error = efi_enter(); 517 if (error != 0) 518 return (error); 519 error = efi_rt_handle_faults ? efi_rt_arch_call(ecp) : 520 efi_rt_arch_call_nofault(ecp); 521 efi_leave(); 522 if (error == 0) 523 error = efi_status_to_errno(ecp->ec_efi_status); 524 else if (bootverbose) 525 printf("EFI %s call faulted, error %d\n", ecp->ec_name, error); 526 return (error); 527 } 528 529 #define EFI_RT_METHOD_PA(method) \ 530 ((uintptr_t)((struct efi_rt *)efi_phys_to_kva((uintptr_t) \ 531 efi_runtime))->method) 532 533 static int 534 efi_get_time_locked(struct efi_tm *tm, struct efi_tmcap *tmcap) 535 { 536 struct efirt_callinfo ec; 537 int error; 538 539 EFI_TIME_OWNED(); 540 if (efi_runtime == NULL) 541 return (ENXIO); 542 bzero(&ec, sizeof(ec)); 543 ec.ec_name = "rt_gettime"; 544 ec.ec_argcnt = 2; 545 ec.ec_arg1 = (uintptr_t)tm; 546 ec.ec_arg2 = (uintptr_t)tmcap; 547 ec.ec_fptr = EFI_RT_METHOD_PA(rt_gettime); 548 error = efi_call(&ec); 549 if (error == 0) 550 kmsan_mark(tm, sizeof(*tm), KMSAN_STATE_INITED); 551 return (error); 552 } 553 554 static int 555 get_time(struct efi_tm *tm) 556 { 557 struct efi_tmcap dummy; 558 int error; 559 560 if (efi_runtime == NULL) 561 return (ENXIO); 562 EFI_TIME_LOCK(); 563 /* 564 * UEFI spec states that the Capabilities argument to GetTime is 565 * optional, but some UEFI implementations choke when passed a NULL 566 * pointer. Pass a dummy efi_tmcap, even though we won't use it, 567 * to workaround such implementations. 568 */ 569 error = efi_get_time_locked(tm, &dummy); 570 EFI_TIME_UNLOCK(); 571 return (error); 572 } 573 574 static int 575 get_time_capabilities(struct efi_tmcap *tmcap) 576 { 577 struct efi_tm dummy; 578 int error; 579 580 if (efi_runtime == NULL) 581 return (ENXIO); 582 EFI_TIME_LOCK(); 583 error = efi_get_time_locked(&dummy, tmcap); 584 EFI_TIME_UNLOCK(); 585 return (error); 586 } 587 588 static int 589 reset_system(enum efi_reset type) 590 { 591 struct efirt_callinfo ec; 592 593 switch (type) { 594 case EFI_RESET_COLD: 595 case EFI_RESET_WARM: 596 case EFI_RESET_SHUTDOWN: 597 break; 598 default: 599 return (EINVAL); 600 } 601 if (efi_runtime == NULL) 602 return (ENXIO); 603 bzero(&ec, sizeof(ec)); 604 ec.ec_name = "rt_reset"; 605 ec.ec_argcnt = 4; 606 ec.ec_arg1 = (uintptr_t)type; 607 ec.ec_arg2 = (uintptr_t)0; 608 ec.ec_arg3 = (uintptr_t)0; 609 ec.ec_arg4 = (uintptr_t)NULL; 610 ec.ec_fptr = EFI_RT_METHOD_PA(rt_reset); 611 return (efi_call(&ec)); 612 } 613 614 static int 615 efi_set_time_locked(struct efi_tm *tm) 616 { 617 struct efirt_callinfo ec; 618 619 EFI_TIME_OWNED(); 620 if (efi_runtime == NULL) 621 return (ENXIO); 622 bzero(&ec, sizeof(ec)); 623 ec.ec_name = "rt_settime"; 624 ec.ec_argcnt = 1; 625 ec.ec_arg1 = (uintptr_t)tm; 626 ec.ec_fptr = EFI_RT_METHOD_PA(rt_settime); 627 return (efi_call(&ec)); 628 } 629 630 static int 631 set_time(struct efi_tm *tm) 632 { 633 int error; 634 635 if (efi_runtime == NULL) 636 return (ENXIO); 637 EFI_TIME_LOCK(); 638 error = efi_set_time_locked(tm); 639 EFI_TIME_UNLOCK(); 640 return (error); 641 } 642 643 static int 644 var_get(efi_char *name, struct uuid *vendor, uint32_t *attrib, 645 size_t *datasize, void *data) 646 { 647 struct efirt_callinfo ec; 648 int error; 649 650 if (efi_runtime == NULL) 651 return (ENXIO); 652 bzero(&ec, sizeof(ec)); 653 ec.ec_argcnt = 5; 654 ec.ec_name = "rt_getvar"; 655 ec.ec_arg1 = (uintptr_t)name; 656 ec.ec_arg2 = (uintptr_t)vendor; 657 ec.ec_arg3 = (uintptr_t)attrib; 658 ec.ec_arg4 = (uintptr_t)datasize; 659 ec.ec_arg5 = (uintptr_t)data; 660 ec.ec_fptr = EFI_RT_METHOD_PA(rt_getvar); 661 error = efi_call(&ec); 662 if (error == 0) 663 kmsan_mark(data, *datasize, KMSAN_STATE_INITED); 664 return (error); 665 } 666 667 static int 668 var_nextname(size_t *namesize, efi_char *name, struct uuid *vendor) 669 { 670 struct efirt_callinfo ec; 671 int error; 672 673 if (efi_runtime == NULL) 674 return (ENXIO); 675 bzero(&ec, sizeof(ec)); 676 ec.ec_argcnt = 3; 677 ec.ec_name = "rt_scanvar"; 678 ec.ec_arg1 = (uintptr_t)namesize; 679 ec.ec_arg2 = (uintptr_t)name; 680 ec.ec_arg3 = (uintptr_t)vendor; 681 ec.ec_fptr = EFI_RT_METHOD_PA(rt_scanvar); 682 error = efi_call(&ec); 683 if (error == 0) 684 kmsan_mark(name, *namesize, KMSAN_STATE_INITED); 685 return (error); 686 } 687 688 static int 689 var_set(efi_char *name, struct uuid *vendor, uint32_t attrib, 690 size_t datasize, void *data) 691 { 692 struct efirt_callinfo ec; 693 694 if (efi_runtime == NULL) 695 return (ENXIO); 696 bzero(&ec, sizeof(ec)); 697 ec.ec_argcnt = 5; 698 ec.ec_name = "rt_setvar"; 699 ec.ec_arg1 = (uintptr_t)name; 700 ec.ec_arg2 = (uintptr_t)vendor; 701 ec.ec_arg3 = (uintptr_t)attrib; 702 ec.ec_arg4 = (uintptr_t)datasize; 703 ec.ec_arg5 = (uintptr_t)data; 704 ec.ec_fptr = EFI_RT_METHOD_PA(rt_setvar); 705 return (efi_call(&ec)); 706 } 707 708 const static struct efi_ops efi_ops = { 709 .rt_ok = rt_ok, 710 .get_table = get_table, 711 .copy_table = copy_table, 712 .get_time = get_time, 713 .get_time_capabilities = get_time_capabilities, 714 .reset_system = reset_system, 715 .set_time = set_time, 716 .var_get = var_get, 717 .var_nextname = var_nextname, 718 .var_set = var_set, 719 }; 720 const struct efi_ops *active_efi_ops = &efi_ops; 721 722 static int 723 efirt_modevents(module_t m, int event, void *arg __unused) 724 { 725 726 switch (event) { 727 case MOD_LOAD: 728 return (efi_init()); 729 730 case MOD_UNLOAD: 731 efi_uninit(); 732 return (0); 733 734 case MOD_SHUTDOWN: 735 return (0); 736 737 default: 738 return (EOPNOTSUPP); 739 } 740 } 741 742 static moduledata_t efirt_moddata = { 743 .name = "efirt", 744 .evhand = efirt_modevents, 745 .priv = NULL, 746 }; 747 /* After fpuinitstate, before efidev */ 748 DECLARE_MODULE(efirt, efirt_moddata, SI_SUB_DRIVERS, SI_ORDER_SECOND); 749 MODULE_VERSION(efirt, 1);
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