pexpert/arm/pe_init.c

   1 /*
   2  * Copyright (c) 2000-2017 Apple Inc. All rights reserved.
   3  *
   4  *    arm platform expert initialization.
   5  */
   6 #include <sys/types.h>
   7 #include <sys/kdebug.h>
   8 #include <mach/vm_param.h>
   9 #include <pexpert/protos.h>
  10 #include <pexpert/pexpert.h>
  11 #include <pexpert/boot.h>
  12 #include <pexpert/device_tree.h>
  13 #include <pexpert/pe_images.h>
  14 #include <kern/sched_prim.h>
  15 #include <machine/machine_routines.h>
  16 #include <arm/caches_internal.h>
  17 #include <kern/debug.h>
  18 #include <libkern/section_keywords.h>
  19
  20 #if defined __arm__
  21 #include <pexpert/arm/board_config.h>
  22 #elif defined __arm64__
  23 #include <pexpert/arm64/board_config.h>
  24 #endif
  25
  26
  27 /* extern references */
  28 extern void     pe_identify_machine(boot_args *bootArgs);
  29
  30 /* static references */
  31 static void     pe_prepare_images(void);
  32
  33 /* private globals */
  34 SECURITY_READ_ONLY_LATE(PE_state_t) PE_state;
  35 #define FW_VERS_LEN 128
  36 char            firmware_version[FW_VERS_LEN];
  37
  38 /*
  39  * This variable is only modified once, when the BSP starts executing. We put it in __TEXT
  40  * as page protections on kernel text early in startup are read-write. The kernel is
  41  * locked down later in start-up, said mappings become RO and thus this
  42  * variable becomes immutable.
  43  *
  44  * See osfmk/arm/arm_vm_init.c for more information.
  45  */
  46 SECURITY_READ_ONLY_SPECIAL_SECTION(volatile uint32_t, "__TEXT,__const") debug_enabled = FALSE;
  47
  48 uint8_t         gPlatformECID[8];
  49 uint32_t        gPlatformMemoryID;
  50 static boolean_t vc_progress_initialized = FALSE;
  51 uint64_t    last_hwaccess_thread = 0;
  52 char     gTargetTypeBuffer[8];
  53 char     gModelTypeBuffer[32];
  54
  55 /* Clock Frequency Info */
  56 clock_frequency_info_t gPEClockFrequencyInfo;
  57
  58 vm_offset_t gPanicBase;
  59 unsigned int gPanicSize;
  60 struct embedded_panic_header *panic_info = NULL;
  61
  62 #if (DEVELOPMENT || DEBUG) && defined(XNU_TARGET_OS_BRIDGE)
  63 /*
  64  * On DEVELOPMENT bridgeOS, we map the x86 panic region
  65  * so we can include this data in bridgeOS corefiles
  66  */
  67 uint64_t macos_panic_base = 0;
  68 unsigned int macos_panic_size = 0;
  69
  70 struct macos_panic_header *mac_panic_header = NULL;
  71 #endif
  72
  73 /* Maximum size of panic log excluding headers, in bytes */
  74 static unsigned int panic_text_len;
  75
  76 /* Whether a console is standing by for panic logging */
  77 static boolean_t panic_console_available = FALSE;
  78
  79 extern uint32_t crc32(uint32_t crc, const void *buf, size_t size);
  80
  81 void PE_slide_devicetree(vm_offset_t);
  82
  83 static void
  84 check_for_panic_log(void)
  85 {
  86 #ifdef PLATFORM_PANIC_LOG_PADDR
  87         gPanicBase = ml_io_map_wcomb(PLATFORM_PANIC_LOG_PADDR, PLATFORM_PANIC_LOG_SIZE);
  88         panic_text_len = PLATFORM_PANIC_LOG_SIZE - sizeof(struct embedded_panic_header);
  89         gPanicSize = PLATFORM_PANIC_LOG_SIZE;
  90 #else
  91         DTEntry entry, chosen;
  92         unsigned int size;
  93         uintptr_t *reg_prop;
  94         uint32_t *panic_region_length;
  95
  96         /*
  97          * DT properties for the panic region are populated by UpdateDeviceTree() in iBoot:
  98          *
  99          * chosen {
 100          *   embedded-panic-log-size = <0x00080000>;
 101          *   [a bunch of other stuff]
 102          * };
 103          *
 104          * pram {
 105          *   reg = <0x00000008_fbc48000 0x00000000_000b4000>;
 106          * };
 107          *
 108          * reg[0] is the physical address
 109          * reg[1] is the size of iBoot's kMemoryRegion_Panic (not used)
 110          * embedded-panic-log-size is the maximum amount of data to store in the buffer
 111          */
 112         if (kSuccess != DTLookupEntry(0, "pram", &entry)) {
 113                 return;
 114         }
 115
 116         if (kSuccess != DTGetProperty(entry, "reg", (void **)&reg_prop, &size)) {
 117                 return;
 118         }
 119
 120         if (kSuccess != DTLookupEntry(0, "/chosen", &chosen)) {
 121                 return;
 122         }
 123
 124         if (kSuccess != DTGetProperty(chosen, "embedded-panic-log-size", (void **) &panic_region_length, &size)) {
 125                 return;
 126         }
 127
 128         gPanicBase = ml_io_map_wcomb(reg_prop[0], panic_region_length[0]);
 129
 130         /* Deduct the size of the panic header from the panic region size */
 131         panic_text_len = panic_region_length[0] - sizeof(struct embedded_panic_header);
 132         gPanicSize = panic_region_length[0];
 133
 134 #if DEVELOPMENT && defined(XNU_TARGET_OS_BRIDGE)
 135         if (PE_consistent_debug_enabled()) {
 136                 uint64_t macos_panic_physbase = 0;
 137                 uint64_t macos_panic_physlen = 0;
 138                 /* Populate the macOS panic region data if it's present in consistent debug */
 139                 if (PE_consistent_debug_lookup_entry(kDbgIdMacOSPanicRegion, &macos_panic_physbase, &macos_panic_physlen)) {
 140                         macos_panic_base = ml_io_map_with_prot(macos_panic_physbase, macos_panic_physlen, VM_PROT_READ);
 141                         mac_panic_header = (struct macos_panic_header *) ((void *) macos_panic_base);
 142                         macos_panic_size = macos_panic_physlen;
 143                 }
 144         }
 145 #endif /* DEVELOPMENT && defined(XNU_TARGET_OS_BRIDGE) */
 146
 147 #endif
 148         panic_info = (struct embedded_panic_header *)gPanicBase;
 149
 150         /* Check if a shared memory console is running in the panic buffer */
 151         if (panic_info->eph_magic == 'SHMC') {
 152                 panic_console_available = TRUE;
 153                 return;
 154         }
 155
 156         /* Check if there's a boot profile in the panic buffer */
 157         if (panic_info->eph_magic == 'BTRC') {
 158                 return;
 159         }
 160
 161         /*
 162          * Check to see if a panic (FUNK) is in VRAM from the last time
 163          */
 164         if (panic_info->eph_magic == EMBEDDED_PANIC_MAGIC) {
 165                 printf("iBoot didn't extract panic log from previous session crash, this is bad\n");
 166         }
 167
 168         /* Clear panic region */
 169         bzero((void *)gPanicBase, gPanicSize);
 170 }
 171
 172 int
 173 PE_initialize_console(PE_Video * info, int op)
 174 {
 175         static int last_console = -1;
 176
 177         if (info && (info != &PE_state.video)) {
 178                 info->v_scale = PE_state.video.v_scale;
 179         }
 180
 181         switch (op) {
 182         case kPEDisableScreen:
 183                 initialize_screen(info, op);
 184                 last_console = switch_to_serial_console();
 185                 kprintf("kPEDisableScreen %d\n", last_console);
 186                 break;
 187
 188         case kPEEnableScreen:
 189                 initialize_screen(info, op);
 190                 if (info) {
 191                         PE_state.video = *info;
 192                 }
 193                 kprintf("kPEEnableScreen %d\n", last_console);
 194                 if (last_console != -1) {
 195                         switch_to_old_console(last_console);
 196                 }
 197                 break;
 198
 199         case kPEReleaseScreen:
 200                 /*
 201                  * we don't show the progress indicator on boot, but want to
 202                  * show it afterwards.
 203                  */
 204                 if (!vc_progress_initialized) {
 205                         default_progress.dx = 0;
 206                         default_progress.dy = 0;
 207                         vc_progress_initialize(&default_progress,
 208                             default_progress_data1x,
 209                             default_progress_data2x,
 210                             default_progress_data3x,
 211                             (unsigned char *) appleClut8);
 212                         vc_progress_initialized = TRUE;
 213                 }
 214                 initialize_screen(info, op);
 215                 break;
 216
 217         default:
 218                 initialize_screen(info, op);
 219                 break;
 220         }
 221
 222         return 0;
 223 }
 224
 225 void
 226 PE_init_iokit(void)
 227 {
 228         DTEntry         entry;
 229         unsigned int    size, scale;
 230         unsigned long   display_size;
 231         void            **map;
 232         unsigned int    show_progress;
 233         int             *delta, image_size, flip;
 234         uint32_t        start_time_value = 0;
 235         uint32_t        debug_wait_start_value = 0;
 236         uint32_t        load_kernel_start_value = 0;
 237         uint32_t        populate_registry_time_value = 0;
 238
 239         PE_init_kprintf(TRUE);
 240         PE_init_printf(TRUE);
 241
 242         printf("iBoot version: %s\n", firmware_version);
 243
 244         if (kSuccess == DTLookupEntry(0, "/chosen/memory-map", &entry)) {
 245                 boot_progress_element *bootPict;
 246
 247                 if (kSuccess == DTGetProperty(entry, "BootCLUT", (void **) &map, &size)) {
 248                         bcopy(map[0], appleClut8, sizeof(appleClut8));
 249                 }
 250
 251                 if (kSuccess == DTGetProperty(entry, "Pict-FailedBoot", (void **) &map, &size)) {
 252                         bootPict = (boot_progress_element *) map[0];
 253                         default_noroot.width = bootPict->width;
 254                         default_noroot.height = bootPict->height;
 255                         default_noroot.dx = 0;
 256                         default_noroot.dy = bootPict->yOffset;
 257                         default_noroot_data = &bootPict->data[0];
 258                 }
 259         }
 260
 261         pe_prepare_images();
 262
 263         scale = PE_state.video.v_scale;
 264         flip = 1;
 265
 266         if (PE_parse_boot_argn("-progress", &show_progress, sizeof(show_progress)) && show_progress) {
 267                 /* Rotation: 0:normal, 1:right 90, 2:left 180, 3:left 90 */
 268                 switch (PE_state.video.v_rotate) {
 269                 case 2:
 270                         flip = -1;
 271                 /* fall through */
 272                 case 0:
 273                         display_size = PE_state.video.v_height;
 274                         image_size = default_progress.height;
 275                         delta = &default_progress.dy;
 276                         break;
 277                 case 1:
 278                         flip = -1;
 279                 /* fall through */
 280                 case 3:
 281                 default:
 282                         display_size = PE_state.video.v_width;
 283                         image_size = default_progress.width;
 284                         delta = &default_progress.dx;
 285                 }
 286                 assert(*delta >= 0);
 287                 while (((unsigned)(*delta + image_size)) >= (display_size / 2)) {
 288                         *delta -= 50 * scale;
 289                         assert(*delta >= 0);
 290                 }
 291                 *delta *= flip;
 292
 293                 /* Check for DT-defined progress y delta */
 294                 PE_get_default("progress-dy", &default_progress.dy, sizeof(default_progress.dy));
 295
 296                 vc_progress_initialize(&default_progress,
 297                     default_progress_data1x,
 298                     default_progress_data2x,
 299                     default_progress_data3x,
 300                     (unsigned char *) appleClut8);
 301                 vc_progress_initialized = TRUE;
 302         }
 303
 304         if (kdebug_enable && kdebug_debugid_enabled(IOKDBG_CODE(DBG_BOOTER, 0))) {
 305                 /* Trace iBoot-provided timing information. */
 306                 if (kSuccess == DTLookupEntry(0, "/chosen/iBoot", &entry)) {
 307                         uint32_t * value_ptr;
 308
 309                         if (kSuccess == DTGetProperty(entry, "start-time", (void **)&value_ptr, &size)) {
 310                                 if (size == sizeof(start_time_value)) {
 311                                         start_time_value = *value_ptr;
 312                                 }
 313                         }
 314
 315                         if (kSuccess == DTGetProperty(entry, "debug-wait-start", (void **)&value_ptr, &size)) {
 316                                 if (size == sizeof(debug_wait_start_value)) {
 317                                         debug_wait_start_value = *value_ptr;
 318                                 }
 319                         }
 320
 321                         if (kSuccess == DTGetProperty(entry, "load-kernel-start", (void **)&value_ptr, &size)) {
 322                                 if (size == sizeof(load_kernel_start_value)) {
 323                                         load_kernel_start_value = *value_ptr;
 324                                 }
 325                         }
 326
 327                         if (kSuccess == DTGetProperty(entry, "populate-registry-time", (void **)&value_ptr, &size)) {
 328                                 if (size == sizeof(populate_registry_time_value)) {
 329                                         populate_registry_time_value = *value_ptr;
 330                                 }
 331                         }
 332                 }
 333
 334                 KDBG_RELEASE(IOKDBG_CODE(DBG_BOOTER, 0), start_time_value, debug_wait_start_value, load_kernel_start_value, populate_registry_time_value);
 335         }
 336
 337         StartIOKit(PE_state.deviceTreeHead, PE_state.bootArgs, (void *) 0, (void *) 0);
 338 }
 339
 340 void
 341 PE_slide_devicetree(vm_offset_t slide)
 342 {
 343         assert(PE_state.initialized);
 344         PE_state.deviceTreeHead += slide;
 345         DTInit(PE_state.deviceTreeHead);
 346 }
 347
 348 void
 349 PE_init_platform(boolean_t vm_initialized, void *args)
 350 {
 351         DTEntry         entry;
 352         unsigned int    size;
 353         void          **prop;
 354         boot_args      *boot_args_ptr = (boot_args *) args;
 355
 356         if (PE_state.initialized == FALSE) {
 357                 PE_state.initialized = TRUE;
 358                 PE_state.bootArgs = boot_args_ptr;
 359                 PE_state.deviceTreeHead = boot_args_ptr->deviceTreeP;
 360                 PE_state.video.v_baseAddr = boot_args_ptr->Video.v_baseAddr;
 361                 PE_state.video.v_rowBytes = boot_args_ptr->Video.v_rowBytes;
 362                 PE_state.video.v_width = boot_args_ptr->Video.v_width;
 363                 PE_state.video.v_height = boot_args_ptr->Video.v_height;
 364                 PE_state.video.v_depth = (boot_args_ptr->Video.v_depth >> kBootVideoDepthDepthShift) & kBootVideoDepthMask;
 365                 PE_state.video.v_rotate = (boot_args_ptr->Video.v_depth >> kBootVideoDepthRotateShift) & kBootVideoDepthMask;
 366                 PE_state.video.v_scale = ((boot_args_ptr->Video.v_depth >> kBootVideoDepthScaleShift) & kBootVideoDepthMask) + 1;
 367                 PE_state.video.v_display = boot_args_ptr->Video.v_display;
 368                 strlcpy(PE_state.video.v_pixelFormat, "BBBBBBBBGGGGGGGGRRRRRRRR", sizeof(PE_state.video.v_pixelFormat));
 369         }
 370         if (!vm_initialized) {
 371                 /*
 372                  * Setup the Device Tree routines
 373                  * so the console can be found and the right I/O space
 374                  * can be used..
 375                  */
 376                 DTInit(PE_state.deviceTreeHead);
 377                 pe_identify_machine(boot_args_ptr);
 378         } else {
 379                 pe_arm_init_interrupts(args);
 380                 pe_arm_init_debug(args);
 381         }
 382
 383         if (!vm_initialized) {
 384                 if (kSuccess == (DTFindEntry("name", "device-tree", &entry))) {
 385                         if (kSuccess == DTGetProperty(entry, "target-type",
 386                             (void **)&prop, &size)) {
 387                                 if (size > sizeof(gTargetTypeBuffer)) {
 388                                         size = sizeof(gTargetTypeBuffer);
 389                                 }
 390                                 bcopy(prop, gTargetTypeBuffer, size);
 391                                 gTargetTypeBuffer[size - 1] = '\0';
 392                         }
 393                 }
 394                 if (kSuccess == (DTFindEntry("name", "device-tree", &entry))) {
 395                         if (kSuccess == DTGetProperty(entry, "model",
 396                             (void **)&prop, &size)) {
 397                                 if (size > sizeof(gModelTypeBuffer)) {
 398                                         size = sizeof(gModelTypeBuffer);
 399                                 }
 400                                 bcopy(prop, gModelTypeBuffer, size);
 401                                 gModelTypeBuffer[size - 1] = '\0';
 402                         }
 403                 }
 404                 if (kSuccess == DTLookupEntry(NULL, "/chosen", &entry)) {
 405                         if (kSuccess == DTGetProperty(entry, "debug-enabled",
 406                             (void **) &prop, &size)) {
 407                                 /*
 408                                  * We purposefully modify a constified variable as
 409                                  * it will get locked down by a trusted monitor or
 410                                  * via page table mappings. We don't want people easily
 411                                  * modifying this variable...
 412                                  */
 413 #pragma clang diagnostic push
 414 #pragma clang diagnostic ignored "-Wcast-qual"
 415                                 boolean_t *modify_debug_enabled = (boolean_t *) &debug_enabled;
 416                                 if (size > sizeof(uint32_t)) {
 417                                         size = sizeof(uint32_t);
 418                                 }
 419                                 bcopy(prop, modify_debug_enabled, size);
 420 #pragma clang diagnostic pop
 421                         }
 422                         if (kSuccess == DTGetProperty(entry, "firmware-version",
 423                             (void **) &prop, &size)) {
 424                                 if (size > sizeof(firmware_version)) {
 425                                         size = sizeof(firmware_version);
 426                                 }
 427                                 bcopy(prop, firmware_version, size);
 428                                 firmware_version[size - 1] = '\0';
 429                         }
 430                         if (kSuccess == DTGetProperty(entry, "unique-chip-id",
 431                             (void **) &prop, &size)) {
 432                                 if (size > sizeof(gPlatformECID)) {
 433                                         size = sizeof(gPlatformECID);
 434                                 }
 435                                 bcopy(prop, gPlatformECID, size);
 436                         }
 437                         if (kSuccess == DTGetProperty(entry, "dram-vendor-id",
 438                             (void **) &prop, &size)) {
 439                                 if (size > sizeof(gPlatformMemoryID)) {
 440                                         size = sizeof(gPlatformMemoryID);
 441                                 }
 442                                 bcopy(prop, &gPlatformMemoryID, size);
 443                         }
 444                 }
 445                 pe_init_debug();
 446         }
 447 }
 448
 449 void
 450 PE_create_console(void)
 451 {
 452         /*
 453          * Check the head of VRAM for a panic log saved on last panic.
 454          * Do this before the VRAM is trashed.
 455          */
 456         check_for_panic_log();
 457
 458         if (PE_state.video.v_display) {
 459                 PE_initialize_console(&PE_state.video, kPEGraphicsMode);
 460         } else {
 461                 PE_initialize_console(&PE_state.video, kPETextMode);
 462         }
 463 }
 464
 465 int
 466 PE_current_console(PE_Video * info)
 467 {
 468         *info = PE_state.video;
 469         return 0;
 470 }
 471
 472 void
 473 PE_display_icon(__unused unsigned int flags, __unused const char *name)
 474 {
 475         if (default_noroot_data) {
 476                 vc_display_icon(&default_noroot, default_noroot_data);
 477         }
 478 }
 479
 480 extern          boolean_t
 481 PE_get_hotkey(__unused unsigned char key)
 482 {
 483         return FALSE;
 484 }
 485
 486 static timebase_callback_func gTimebaseCallback;
 487
 488 void
 489 PE_register_timebase_callback(timebase_callback_func callback)
 490 {
 491         gTimebaseCallback = callback;
 492
 493         PE_call_timebase_callback();
 494 }
 495
 496 void
 497 PE_call_timebase_callback(void)
 498 {
 499         struct timebase_freq_t timebase_freq;
 500
 501         timebase_freq.timebase_num = gPEClockFrequencyInfo.timebase_frequency_hz;
 502         timebase_freq.timebase_den = 1;
 503
 504         if (gTimebaseCallback) {
 505                 gTimebaseCallback(&timebase_freq);
 506         }
 507 }
 508
 509 /*
 510  * The default PE_poll_input handler.
 511  */
 512 int
 513 PE_stub_poll_input(__unused unsigned int options, char *c)
 514 {
 515         *c = uart_getc();
 516         return 0;               /* 0 for success, 1 for unsupported */
 517 }
 518
 519 /*
 520  * This routine will return 1 if you are running on a device with a variant
 521  * of iBoot that allows debugging. This is typically not the case on production
 522  * fused parts (even when running development variants of iBoot).
 523  *
 524  * The routine takes an optional argument of the flags passed to debug="" so
 525  * kexts don't have to parse the boot arg themselves.
 526  */
 527 uint32_t
 528 PE_i_can_has_debugger(uint32_t *debug_flags)
 529 {
 530         if (debug_flags) {
 531 #if DEVELOPMENT || DEBUG
 532                 assert(debug_boot_arg_inited);
 533 #endif
 534                 if (debug_enabled) {
 535                         *debug_flags = debug_boot_arg;
 536                 } else {
 537                         *debug_flags = 0;
 538                 }
 539         }
 540         return debug_enabled;
 541 }
 542
 543 /*
 544  * This routine returns TRUE if the device is configured
 545  * with panic debugging enabled.
 546  */
 547 boolean_t
 548 PE_panic_debugging_enabled()
 549 {
 550         return panicDebugging;
 551 }
 552
 553 void
 554 PE_save_buffer_to_vram(unsigned char *buf, unsigned int *size)
 555 {
 556         if (!panic_info || !size) {
 557                 return;
 558         }
 559
 560         if (!buf) {
 561                 *size = panic_text_len;
 562                 return;
 563         }
 564
 565         if (*size == 0) {
 566                 return;
 567         }
 568
 569         *size = *size > panic_text_len ? panic_text_len : *size;
 570         if (panic_info->eph_magic != EMBEDDED_PANIC_MAGIC) {
 571                 printf("Error!! Current Magic 0x%X, expected value 0x%x", panic_info->eph_magic, EMBEDDED_PANIC_MAGIC);
 572         }
 573
 574         /* CRC everything after the CRC itself - starting with the panic header version */
 575         panic_info->eph_crc = crc32(0L, &panic_info->eph_version, (panic_text_len +
 576             sizeof(struct embedded_panic_header) - offsetof(struct embedded_panic_header, eph_version)));
 577 }
 578
 579 uint32_t
 580 PE_get_offset_into_panic_region(char *location)
 581 {
 582         assert(panic_info != NULL);
 583         assert(location > (char *) panic_info);
 584         assert((unsigned int)(location - (char *) panic_info) < panic_text_len);
 585
 586         return (uint32_t) (location - gPanicBase);
 587 }
 588
 589 void
 590 PE_init_panicheader()
 591 {
 592         if (!panic_info) {
 593                 return;
 594         }
 595
 596         bzero(panic_info, sizeof(struct embedded_panic_header));
 597
 598         /*
 599          * The panic log begins immediately after the panic header -- debugger synchronization and other functions
 600          * may log into this region before we've become the exclusive panicking CPU and initialize the header here.
 601          */
 602         panic_info->eph_panic_log_offset = PE_get_offset_into_panic_region(debug_buf_base);
 603
 604         panic_info->eph_magic = EMBEDDED_PANIC_MAGIC;
 605         panic_info->eph_version = EMBEDDED_PANIC_HEADER_CURRENT_VERSION;
 606
 607         return;
 608 }
 609
 610 /*
 611  * Tries to update the panic header to keep it consistent on nested panics.
 612  *
 613  * NOTE: The purpose of this function is NOT to detect/correct corruption in the panic region,
 614  *       it is to update the panic header to make it consistent when we nest panics.
 615  */
 616 void
 617 PE_update_panicheader_nestedpanic()
 618 {
 619         if (!panic_info) {
 620                 return;
 621         }
 622
 623         /*
 624          * If the panic log offset is not set, re-init the panic header
 625          */
 626         if (panic_info->eph_panic_log_offset == 0) {
 627                 PE_init_panicheader();
 628                 panic_info->eph_panic_flags |= EMBEDDED_PANIC_HEADER_FLAG_NESTED_PANIC;
 629                 return;
 630         }
 631
 632         panic_info->eph_panic_flags |= EMBEDDED_PANIC_HEADER_FLAG_NESTED_PANIC;
 633
 634         /*
 635          * If the panic log length is not set, set the end to
 636          * the current location of the debug_buf_ptr to close it.
 637          */
 638         if (panic_info->eph_panic_log_len == 0) {
 639                 panic_info->eph_panic_log_len = PE_get_offset_into_panic_region(debug_buf_ptr);
 640
 641                 /* If this assert fires, it's indicative of corruption in the panic region */
 642                 assert(panic_info->eph_other_log_offset == panic_info->eph_other_log_len == 0);
 643         }
 644
 645         /* If this assert fires, it's likely indicative of corruption in the panic region */
 646         assert(((panic_info->eph_stackshot_offset == 0) && (panic_info->eph_stackshot_len == 0)) ||
 647             ((panic_info->eph_stackshot_offset != 0) && (panic_info->eph_stackshot_len != 0)));
 648
 649         /*
 650          * If we haven't set up the other log yet, set the beginning of the other log
 651          * to the current location of the debug_buf_ptr
 652          */
 653         if (panic_info->eph_other_log_offset == 0) {
 654                 panic_info->eph_other_log_offset = PE_get_offset_into_panic_region(debug_buf_ptr);
 655
 656                 /* If this assert fires, it's indicative of corruption in the panic region */
 657                 assert(panic_info->eph_other_log_len == 0);
 658         }
 659
 660         return;
 661 }
 662
 663 boolean_t
 664 PE_reboot_on_panic(void)
 665 {
 666         uint32_t debug_flags;
 667
 668         if (PE_i_can_has_debugger(&debug_flags)
 669             && (debug_flags & DB_NMI)) {
 670                 /* kernel debugging is active */
 671                 return FALSE;
 672         } else {
 673                 return TRUE;
 674         }
 675 }
 676
 677 void
 678 PE_sync_panic_buffers(void)
 679 {
 680         /*
 681          * rdar://problem/26453070:
 682          * The iBoot panic region is write-combined on arm64.  We must flush dirty lines
 683          * from L1/L2 as late as possible before reset, with no further reads of the panic
 684          * region between the flush and the reset.  Some targets have an additional memcache (L3),
 685          * and a read may bring dirty lines out of L3 and back into L1/L2, causing the lines to
 686          * be discarded on reset.  If we can make sure the lines are flushed to L3/DRAM,
 687          * the platform reset handler will flush any L3.
 688          */
 689         if (gPanicBase) {
 690                 CleanPoC_DcacheRegion_Force(gPanicBase, gPanicSize);
 691         }
 692 }
 693
 694 static void
 695 pe_prepare_images(void)
 696 {
 697         if ((1 & PE_state.video.v_rotate) != 0) {
 698                 // Only square square images with radial symmetry are supported
 699                 // No need to actually rotate the data
 700
 701                 // Swap the dx and dy offsets
 702                 uint32_t tmp = default_progress.dx;
 703                 default_progress.dx = default_progress.dy;
 704                 default_progress.dy = tmp;
 705         }
 706 #if 0
 707         uint32_t cnt, cnt2, cnt3, cnt4;
 708         uint32_t tmp, width, height;
 709         uint8_t  data, *new_data;
 710         const uint8_t *old_data;
 711
 712         width  = default_progress.width;
 713         height = default_progress.height * default_progress.count;
 714
 715         // Scale images if the UI is being scaled
 716         if (PE_state.video.v_scale > 1) {
 717                 new_data = kalloc(width * height * scale * scale);
 718                 if (new_data != 0) {
 719                         old_data = default_progress_data;
 720                         default_progress_data = new_data;
 721                         for (cnt = 0; cnt < height; cnt++) {
 722                                 for (cnt2 = 0; cnt2 < width; cnt2++) {
 723                                         data = *(old_data++);
 724                                         for (cnt3 = 0; cnt3 < scale; cnt3++) {
 725                                                 for (cnt4 = 0; cnt4 < scale; cnt4++) {
 726                                                         new_data[width * scale * cnt3 + cnt4] = data;
 727                                                 }
 728                                         }
 729                                         new_data += scale;
 730                                 }
 731                                 new_data += width * scale * (scale - 1);
 732                         }
 733                         default_progress.width  *= scale;
 734                         default_progress.height *= scale;
 735                         default_progress.dx     *= scale;
 736                         default_progress.dy     *= scale;
 737                 }
 738         }
 739 #endif
 740 }
 741
 742 void
 743 PE_mark_hwaccess(uint64_t thread)
 744 {
 745         last_hwaccess_thread = thread;
 746         asm volatile ("dmb ish");
 747 }