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