boot1.c revision 329100
1/*- 2 * Copyright (c) 1998 Robert Nordier 3 * All rights reserved. 4 * Copyright (c) 2001 Robert Drehmel 5 * All rights reserved. 6 * Copyright (c) 2014 Nathan Whitehorn 7 * All rights reserved. 8 * Copyright (c) 2015 Eric McCorkle 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms are freely 12 * permitted provided that the above copyright notice and this 13 * paragraph and the following disclaimer are duplicated in all 14 * such forms. 15 * 16 * This software is provided "AS IS" and without any express or 17 * implied warranties, including, without limitation, the implied 18 * warranties of merchantability and fitness for a particular 19 * purpose. 20 */ 21 22#include <sys/cdefs.h> 23__FBSDID("$FreeBSD: stable/11/sys/boot/efi/boot1/boot1.c 329100 2018-02-10 04:56:07Z kevans $"); 24 25#include <sys/param.h> 26#include <machine/elf.h> 27#include <machine/stdarg.h> 28#include <stand.h> 29 30#include <efi.h> 31#include <eficonsctl.h> 32 33#include "boot_module.h" 34#include "paths.h" 35 36static const boot_module_t *boot_modules[] = 37{ 38#ifdef EFI_ZFS_BOOT 39 &zfs_module, 40#endif 41#ifdef EFI_UFS_BOOT 42 &ufs_module 43#endif 44}; 45 46#define NUM_BOOT_MODULES nitems(boot_modules) 47/* The initial number of handles used to query EFI for partitions. */ 48#define NUM_HANDLES_INIT 24 49 50EFI_STATUS efi_main(EFI_HANDLE Ximage, EFI_SYSTEM_TABLE* Xsystab); 51 52EFI_SYSTEM_TABLE *systab; 53EFI_BOOT_SERVICES *bs; 54static EFI_HANDLE *image; 55 56static EFI_GUID BlockIoProtocolGUID = BLOCK_IO_PROTOCOL; 57static EFI_GUID DevicePathGUID = DEVICE_PATH_PROTOCOL; 58static EFI_GUID LoadedImageGUID = LOADED_IMAGE_PROTOCOL; 59static EFI_GUID ConsoleControlGUID = EFI_CONSOLE_CONTROL_PROTOCOL_GUID; 60 61/* 62 * Provide Malloc / Free backed by EFIs AllocatePool / FreePool which ensures 63 * memory is correctly aligned avoiding EFI_INVALID_PARAMETER returns from 64 * EFI methods. 65 */ 66void * 67Malloc(size_t len, const char *file __unused, int line __unused) 68{ 69 void *out; 70 71 if (bs->AllocatePool(EfiLoaderData, len, &out) == EFI_SUCCESS) 72 return (out); 73 74 return (NULL); 75} 76 77void 78Free(void *buf, const char *file __unused, int line __unused) 79{ 80 if (buf != NULL) 81 (void)bs->FreePool(buf); 82} 83 84/* 85 * nodes_match returns TRUE if the imgpath isn't NULL and the nodes match, 86 * FALSE otherwise. 87 */ 88static BOOLEAN 89nodes_match(EFI_DEVICE_PATH *imgpath, EFI_DEVICE_PATH *devpath) 90{ 91 int len; 92 93 if (imgpath == NULL || imgpath->Type != devpath->Type || 94 imgpath->SubType != devpath->SubType) 95 return (FALSE); 96 97 len = DevicePathNodeLength(imgpath); 98 if (len != DevicePathNodeLength(devpath)) 99 return (FALSE); 100 101 return (memcmp(imgpath, devpath, (size_t)len) == 0); 102} 103 104/* 105 * device_paths_match returns TRUE if the imgpath isn't NULL and all nodes 106 * in imgpath and devpath match up to their respective occurrences of a 107 * media node, FALSE otherwise. 108 */ 109static BOOLEAN 110device_paths_match(EFI_DEVICE_PATH *imgpath, EFI_DEVICE_PATH *devpath) 111{ 112 113 if (imgpath == NULL) 114 return (FALSE); 115 116 while (!IsDevicePathEnd(imgpath) && !IsDevicePathEnd(devpath)) { 117 if (IsDevicePathType(imgpath, MEDIA_DEVICE_PATH) && 118 IsDevicePathType(devpath, MEDIA_DEVICE_PATH)) 119 return (TRUE); 120 121 if (!nodes_match(imgpath, devpath)) 122 return (FALSE); 123 124 imgpath = NextDevicePathNode(imgpath); 125 devpath = NextDevicePathNode(devpath); 126 } 127 128 return (FALSE); 129} 130 131/* 132 * devpath_last returns the last non-path end node in devpath. 133 */ 134static EFI_DEVICE_PATH * 135devpath_last(EFI_DEVICE_PATH *devpath) 136{ 137 138 while (!IsDevicePathEnd(NextDevicePathNode(devpath))) 139 devpath = NextDevicePathNode(devpath); 140 141 return (devpath); 142} 143 144/* 145 * devpath_node_str is a basic output method for a devpath node which 146 * only understands a subset of the available sub types. 147 * 148 * If we switch to UEFI 2.x then we should update it to use: 149 * EFI_DEVICE_PATH_TO_TEXT_PROTOCOL. 150 */ 151static int 152devpath_node_str(char *buf, size_t size, EFI_DEVICE_PATH *devpath) 153{ 154 155 switch (devpath->Type) { 156 case MESSAGING_DEVICE_PATH: 157 switch (devpath->SubType) { 158 case MSG_ATAPI_DP: { 159 ATAPI_DEVICE_PATH *atapi; 160 161 atapi = (ATAPI_DEVICE_PATH *)(void *)devpath; 162 return snprintf(buf, size, "ata(%s,%s,0x%x)", 163 (atapi->PrimarySecondary == 1) ? "Sec" : "Pri", 164 (atapi->SlaveMaster == 1) ? "Slave" : "Master", 165 atapi->Lun); 166 } 167 case MSG_USB_DP: { 168 USB_DEVICE_PATH *usb; 169 170 usb = (USB_DEVICE_PATH *)devpath; 171 return snprintf(buf, size, "usb(0x%02x,0x%02x)", 172 usb->ParentPortNumber, usb->InterfaceNumber); 173 } 174 case MSG_SCSI_DP: { 175 SCSI_DEVICE_PATH *scsi; 176 177 scsi = (SCSI_DEVICE_PATH *)(void *)devpath; 178 return snprintf(buf, size, "scsi(0x%02x,0x%02x)", 179 scsi->Pun, scsi->Lun); 180 } 181 case MSG_SATA_DP: { 182 SATA_DEVICE_PATH *sata; 183 184 sata = (SATA_DEVICE_PATH *)(void *)devpath; 185 return snprintf(buf, size, "sata(0x%x,0x%x,0x%x)", 186 sata->HBAPortNumber, sata->PortMultiplierPortNumber, 187 sata->Lun); 188 } 189 default: 190 return snprintf(buf, size, "msg(0x%02x)", 191 devpath->SubType); 192 } 193 break; 194 case HARDWARE_DEVICE_PATH: 195 switch (devpath->SubType) { 196 case HW_PCI_DP: { 197 PCI_DEVICE_PATH *pci; 198 199 pci = (PCI_DEVICE_PATH *)devpath; 200 return snprintf(buf, size, "pci(0x%02x,0x%02x)", 201 pci->Device, pci->Function); 202 } 203 default: 204 return snprintf(buf, size, "hw(0x%02x)", 205 devpath->SubType); 206 } 207 break; 208 case ACPI_DEVICE_PATH: { 209 ACPI_HID_DEVICE_PATH *acpi; 210 211 acpi = (ACPI_HID_DEVICE_PATH *)(void *)devpath; 212 if ((acpi->HID & PNP_EISA_ID_MASK) == PNP_EISA_ID_CONST) { 213 switch (EISA_ID_TO_NUM(acpi->HID)) { 214 case 0x0a03: 215 return snprintf(buf, size, "pciroot(0x%x)", 216 acpi->UID); 217 case 0x0a08: 218 return snprintf(buf, size, "pcieroot(0x%x)", 219 acpi->UID); 220 case 0x0604: 221 return snprintf(buf, size, "floppy(0x%x)", 222 acpi->UID); 223 case 0x0301: 224 return snprintf(buf, size, "keyboard(0x%x)", 225 acpi->UID); 226 case 0x0501: 227 return snprintf(buf, size, "serial(0x%x)", 228 acpi->UID); 229 case 0x0401: 230 return snprintf(buf, size, "parallelport(0x%x)", 231 acpi->UID); 232 default: 233 return snprintf(buf, size, "acpi(pnp%04x,0x%x)", 234 EISA_ID_TO_NUM(acpi->HID), acpi->UID); 235 } 236 } 237 238 return snprintf(buf, size, "acpi(0x%08x,0x%x)", acpi->HID, 239 acpi->UID); 240 } 241 case MEDIA_DEVICE_PATH: 242 switch (devpath->SubType) { 243 case MEDIA_CDROM_DP: { 244 CDROM_DEVICE_PATH *cdrom; 245 246 cdrom = (CDROM_DEVICE_PATH *)(void *)devpath; 247 return snprintf(buf, size, "cdrom(%x)", 248 cdrom->BootEntry); 249 } 250 case MEDIA_HARDDRIVE_DP: { 251 HARDDRIVE_DEVICE_PATH *hd; 252 253 hd = (HARDDRIVE_DEVICE_PATH *)(void *)devpath; 254 return snprintf(buf, size, "hd(%x)", 255 hd->PartitionNumber); 256 } 257 default: 258 return snprintf(buf, size, "media(0x%02x)", 259 devpath->SubType); 260 } 261 case BBS_DEVICE_PATH: 262 return snprintf(buf, size, "bbs(0x%02x)", devpath->SubType); 263 case END_DEVICE_PATH_TYPE: 264 return (0); 265 } 266 267 return snprintf(buf, size, "type(0x%02x, 0x%02x)", devpath->Type, 268 devpath->SubType); 269} 270 271/* 272 * devpath_strlcat appends a text description of devpath to buf but not more 273 * than size - 1 characters followed by NUL-terminator. 274 */ 275int 276devpath_strlcat(char *buf, size_t size, EFI_DEVICE_PATH *devpath) 277{ 278 size_t len, used; 279 const char *sep; 280 281 sep = ""; 282 used = 0; 283 while (!IsDevicePathEnd(devpath)) { 284 len = snprintf(buf, size - used, "%s", sep); 285 used += len; 286 if (used > size) 287 return (used); 288 buf += len; 289 290 len = devpath_node_str(buf, size - used, devpath); 291 used += len; 292 if (used > size) 293 return (used); 294 buf += len; 295 devpath = NextDevicePathNode(devpath); 296 sep = ":"; 297 } 298 299 return (used); 300} 301 302/* 303 * devpath_str is convenience method which returns the text description of 304 * devpath using a static buffer, so it isn't thread safe! 305 */ 306char * 307devpath_str(EFI_DEVICE_PATH *devpath) 308{ 309 static char buf[256]; 310 311 devpath_strlcat(buf, sizeof(buf), devpath); 312 313 return buf; 314} 315 316/* 317 * load_loader attempts to load the loader image data. 318 * 319 * It tries each module and its respective devices, identified by mod->probe, 320 * in order until a successful load occurs at which point it returns EFI_SUCCESS 321 * and EFI_NOT_FOUND otherwise. 322 * 323 * Only devices which have preferred matching the preferred parameter are tried. 324 */ 325static EFI_STATUS 326load_loader(const boot_module_t **modp, dev_info_t **devinfop, void **bufp, 327 size_t *bufsize, BOOLEAN preferred) 328{ 329 UINTN i; 330 dev_info_t *dev; 331 const boot_module_t *mod; 332 333 for (i = 0; i < NUM_BOOT_MODULES; i++) { 334 mod = boot_modules[i]; 335 for (dev = mod->devices(); dev != NULL; dev = dev->next) { 336 if (dev->preferred != preferred) 337 continue; 338 339 if (mod->load(PATH_LOADER_EFI, dev, bufp, bufsize) == 340 EFI_SUCCESS) { 341 *devinfop = dev; 342 *modp = mod; 343 return (EFI_SUCCESS); 344 } 345 } 346 } 347 348 return (EFI_NOT_FOUND); 349} 350 351/* 352 * try_boot only returns if it fails to load the loader. If it succeeds 353 * it simply boots, otherwise it returns the status of last EFI call. 354 */ 355static EFI_STATUS 356try_boot(void) 357{ 358 size_t bufsize, loadersize, cmdsize; 359 void *buf, *loaderbuf; 360 char *cmd; 361 dev_info_t *dev; 362 const boot_module_t *mod; 363 EFI_HANDLE loaderhandle; 364 EFI_LOADED_IMAGE *loaded_image; 365 EFI_STATUS status; 366 367 status = load_loader(&mod, &dev, &loaderbuf, &loadersize, TRUE); 368 if (status != EFI_SUCCESS) { 369 status = load_loader(&mod, &dev, &loaderbuf, &loadersize, 370 FALSE); 371 if (status != EFI_SUCCESS) { 372 printf("Failed to load '%s'\n", PATH_LOADER_EFI); 373 return (status); 374 } 375 } 376 377 /* 378 * Read in and parse the command line from /boot.config or /boot/config, 379 * if present. We'll pass it the next stage via a simple ASCII 380 * string. loader.efi has a hack for ASCII strings, so we'll use that to 381 * keep the size down here. We only try to read the alternate file if 382 * we get EFI_NOT_FOUND because all other errors mean that the boot_module 383 * had troubles with the filesystem. We could return early, but we'll let 384 * loading the actual kernel sort all that out. Since these files are 385 * optional, we don't report errors in trying to read them. 386 */ 387 cmd = NULL; 388 cmdsize = 0; 389 status = mod->load(PATH_DOTCONFIG, dev, &buf, &bufsize); 390 if (status == EFI_NOT_FOUND) 391 status = mod->load(PATH_CONFIG, dev, &buf, &bufsize); 392 if (status == EFI_SUCCESS) { 393 cmdsize = bufsize + 1; 394 cmd = malloc(cmdsize); 395 if (cmd == NULL) 396 goto errout; 397 memcpy(cmd, buf, bufsize); 398 cmd[bufsize] = '\0'; 399 free(buf); 400 buf = NULL; 401 } 402 403 if ((status = bs->LoadImage(TRUE, image, devpath_last(dev->devpath), 404 loaderbuf, loadersize, &loaderhandle)) != EFI_SUCCESS) { 405 printf("Failed to load image provided by %s, size: %zu, (%lu)\n", 406 mod->name, loadersize, EFI_ERROR_CODE(status)); 407 goto errout; 408 } 409 410 if ((status = bs->HandleProtocol(loaderhandle, &LoadedImageGUID, 411 (VOID**)&loaded_image)) != EFI_SUCCESS) { 412 printf("Failed to query LoadedImage provided by %s (%lu)\n", 413 mod->name, EFI_ERROR_CODE(status)); 414 goto errout; 415 } 416 417 if (cmd != NULL) 418 printf(" command args: %s\n", cmd); 419 420 loaded_image->DeviceHandle = dev->devhandle; 421 loaded_image->LoadOptionsSize = cmdsize; 422 loaded_image->LoadOptions = cmd; 423 424 DPRINTF("Starting '%s' in 5 seconds...", PATH_LOADER_EFI); 425 DSTALL(1000000); 426 DPRINTF("."); 427 DSTALL(1000000); 428 DPRINTF("."); 429 DSTALL(1000000); 430 DPRINTF("."); 431 DSTALL(1000000); 432 DPRINTF("."); 433 DSTALL(1000000); 434 DPRINTF(".\n"); 435 436 if ((status = bs->StartImage(loaderhandle, NULL, NULL)) != 437 EFI_SUCCESS) { 438 printf("Failed to start image provided by %s (%lu)\n", 439 mod->name, EFI_ERROR_CODE(status)); 440 loaded_image->LoadOptionsSize = 0; 441 loaded_image->LoadOptions = NULL; 442 } 443 444errout: 445 if (cmd != NULL) 446 free(cmd); 447 if (buf != NULL) 448 free(buf); 449 if (loaderbuf != NULL) 450 free(loaderbuf); 451 452 return (status); 453} 454 455/* 456 * probe_handle determines if the passed handle represents a logical partition 457 * if it does it uses each module in order to probe it and if successful it 458 * returns EFI_SUCCESS. 459 */ 460static EFI_STATUS 461probe_handle(EFI_HANDLE h, EFI_DEVICE_PATH *imgpath, BOOLEAN *preferred) 462{ 463 dev_info_t *devinfo; 464 EFI_BLOCK_IO *blkio; 465 EFI_DEVICE_PATH *devpath; 466 EFI_STATUS status; 467 UINTN i; 468 469 /* Figure out if we're dealing with an actual partition. */ 470 status = bs->HandleProtocol(h, &DevicePathGUID, (void **)&devpath); 471 if (status == EFI_UNSUPPORTED) 472 return (status); 473 474 if (status != EFI_SUCCESS) { 475 DPRINTF("\nFailed to query DevicePath (%lu)\n", 476 EFI_ERROR_CODE(status)); 477 return (status); 478 } 479 480 DPRINTF("probing: %s\n", devpath_str(devpath)); 481 482 status = bs->HandleProtocol(h, &BlockIoProtocolGUID, (void **)&blkio); 483 if (status == EFI_UNSUPPORTED) 484 return (status); 485 486 if (status != EFI_SUCCESS) { 487 DPRINTF("\nFailed to query BlockIoProtocol (%lu)\n", 488 EFI_ERROR_CODE(status)); 489 return (status); 490 } 491 492 if (!blkio->Media->LogicalPartition) 493 return (EFI_UNSUPPORTED); 494 495 *preferred = device_paths_match(imgpath, devpath); 496 497 /* Run through each module, see if it can load this partition */ 498 for (i = 0; i < NUM_BOOT_MODULES; i++) { 499 if ((status = bs->AllocatePool(EfiLoaderData, 500 sizeof(*devinfo), (void **)&devinfo)) != 501 EFI_SUCCESS) { 502 DPRINTF("\nFailed to allocate devinfo (%lu)\n", 503 EFI_ERROR_CODE(status)); 504 continue; 505 } 506 devinfo->dev = blkio; 507 devinfo->devpath = devpath; 508 devinfo->devhandle = h; 509 devinfo->devdata = NULL; 510 devinfo->preferred = *preferred; 511 devinfo->next = NULL; 512 513 status = boot_modules[i]->probe(devinfo); 514 if (status == EFI_SUCCESS) 515 return (EFI_SUCCESS); 516 (void)bs->FreePool(devinfo); 517 } 518 519 return (EFI_UNSUPPORTED); 520} 521 522/* 523 * probe_handle_status calls probe_handle and outputs the returned status 524 * of the call. 525 */ 526static void 527probe_handle_status(EFI_HANDLE h, EFI_DEVICE_PATH *imgpath) 528{ 529 EFI_STATUS status; 530 BOOLEAN preferred; 531 532 preferred = FALSE; 533 status = probe_handle(h, imgpath, &preferred); 534 535 DPRINTF("probe: "); 536 switch (status) { 537 case EFI_UNSUPPORTED: 538 printf("."); 539 DPRINTF(" not supported\n"); 540 break; 541 case EFI_SUCCESS: 542 if (preferred) { 543 printf("%c", '*'); 544 DPRINTF(" supported (preferred)\n"); 545 } else { 546 printf("%c", '+'); 547 DPRINTF(" supported\n"); 548 } 549 break; 550 default: 551 printf("x"); 552 DPRINTF(" error (%lu)\n", EFI_ERROR_CODE(status)); 553 break; 554 } 555 DSTALL(500000); 556} 557 558EFI_STATUS 559efi_main(EFI_HANDLE Ximage, EFI_SYSTEM_TABLE *Xsystab) 560{ 561 EFI_HANDLE *handles; 562 EFI_LOADED_IMAGE *img; 563 EFI_DEVICE_PATH *imgpath; 564 EFI_STATUS status; 565 EFI_CONSOLE_CONTROL_PROTOCOL *ConsoleControl = NULL; 566 SIMPLE_TEXT_OUTPUT_INTERFACE *conout = NULL; 567 UINTN i, max_dim, best_mode, cols, rows, hsize, nhandles; 568 569 /* Basic initialization*/ 570 systab = Xsystab; 571 image = Ximage; 572 bs = Xsystab->BootServices; 573 574 /* Set up the console, so printf works. */ 575 status = bs->LocateProtocol(&ConsoleControlGUID, NULL, 576 (VOID **)&ConsoleControl); 577 if (status == EFI_SUCCESS) 578 (void)ConsoleControl->SetMode(ConsoleControl, 579 EfiConsoleControlScreenText); 580 /* 581 * Reset the console and find the best text mode. 582 */ 583 conout = systab->ConOut; 584 conout->Reset(conout, TRUE); 585 max_dim = best_mode = 0; 586 for (i = 0; ; i++) { 587 status = conout->QueryMode(conout, i, &cols, &rows); 588 if (EFI_ERROR(status)) 589 break; 590 if (cols * rows > max_dim) { 591 max_dim = cols * rows; 592 best_mode = i; 593 } 594 } 595 if (max_dim > 0) 596 conout->SetMode(conout, best_mode); 597 conout->EnableCursor(conout, TRUE); 598 conout->ClearScreen(conout); 599 600 printf("\n>> FreeBSD EFI boot block\n"); 601 printf(" Loader path: %s\n\n", PATH_LOADER_EFI); 602 printf(" Initializing modules:"); 603 for (i = 0; i < NUM_BOOT_MODULES; i++) { 604 printf(" %s", boot_modules[i]->name); 605 if (boot_modules[i]->init != NULL) 606 boot_modules[i]->init(); 607 } 608 putchar('\n'); 609 610 /* Get all the device handles */ 611 hsize = (UINTN)NUM_HANDLES_INIT * sizeof(EFI_HANDLE); 612 if ((status = bs->AllocatePool(EfiLoaderData, hsize, (void **)&handles)) 613 != EFI_SUCCESS) 614 panic("Failed to allocate %d handles (%lu)", NUM_HANDLES_INIT, 615 EFI_ERROR_CODE(status)); 616 617 status = bs->LocateHandle(ByProtocol, &BlockIoProtocolGUID, NULL, 618 &hsize, handles); 619 switch (status) { 620 case EFI_SUCCESS: 621 break; 622 case EFI_BUFFER_TOO_SMALL: 623 (void)bs->FreePool(handles); 624 if ((status = bs->AllocatePool(EfiLoaderData, hsize, 625 (void **)&handles)) != EFI_SUCCESS) { 626 panic("Failed to allocate %zu handles (%lu)", hsize / 627 sizeof(*handles), EFI_ERROR_CODE(status)); 628 } 629 status = bs->LocateHandle(ByProtocol, &BlockIoProtocolGUID, 630 NULL, &hsize, handles); 631 if (status != EFI_SUCCESS) 632 panic("Failed to get device handles (%lu)\n", 633 EFI_ERROR_CODE(status)); 634 break; 635 default: 636 panic("Failed to get device handles (%lu)", 637 EFI_ERROR_CODE(status)); 638 } 639 640 /* Scan all partitions, probing with all modules. */ 641 nhandles = hsize / sizeof(*handles); 642 printf(" Probing %zu block devices...", nhandles); 643 DPRINTF("\n"); 644 645 /* Determine the devpath of our image so we can prefer it. */ 646 status = bs->HandleProtocol(image, &LoadedImageGUID, (VOID**)&img); 647 imgpath = NULL; 648 if (status == EFI_SUCCESS) { 649 status = bs->HandleProtocol(img->DeviceHandle, &DevicePathGUID, 650 (void **)&imgpath); 651 if (status != EFI_SUCCESS) 652 DPRINTF("Failed to get image DevicePath (%lu)\n", 653 EFI_ERROR_CODE(status)); 654 DPRINTF("boot1 imagepath: %s\n", devpath_str(imgpath)); 655 } 656 657 for (i = 0; i < nhandles; i++) 658 probe_handle_status(handles[i], imgpath); 659 printf(" done\n"); 660 661 /* Status summary. */ 662 for (i = 0; i < NUM_BOOT_MODULES; i++) { 663 printf(" "); 664 boot_modules[i]->status(); 665 } 666 667 try_boot(); 668 669 /* If we get here, we're out of luck... */ 670 panic("No bootable partitions found!"); 671} 672 673/* 674 * add_device adds a device to the passed devinfo list. 675 */ 676void 677add_device(dev_info_t **devinfop, dev_info_t *devinfo) 678{ 679 dev_info_t *dev; 680 681 if (*devinfop == NULL) { 682 *devinfop = devinfo; 683 return; 684 } 685 686 for (dev = *devinfop; dev->next != NULL; dev = dev->next) 687 ; 688 689 dev->next = devinfo; 690} 691 692void 693panic(const char *fmt, ...) 694{ 695 va_list ap; 696 697 printf("panic: "); 698 va_start(ap, fmt); 699 vprintf(fmt, ap); 700 va_end(ap); 701 printf("\n"); 702 703 while (1) {} 704} 705 706void 707putchar(int c) 708{ 709 CHAR16 buf[2]; 710 711 if (c == '\n') { 712 buf[0] = '\r'; 713 buf[1] = 0; 714 systab->ConOut->OutputString(systab->ConOut, buf); 715 } 716 buf[0] = c; 717 buf[1] = 0; 718 systab->ConOut->OutputString(systab->ConOut, buf); 719} 720