path: root/firmware/lib/vboot_display.c

/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Display functions used in kernel selection.
 */

#include "gbb_header.h"
#include "utility.h"
#include "vboot_api.h"
#include "vboot_common.h"
#include "vboot_display.h"
#include "vboot_nvstorage.h"

static uint32_t disp_current_screen = VB_SCREEN_BLANK;
static uint32_t disp_width = 0, disp_height = 0;


/* Get the number of localizations in the GBB bitmap data. */
static VbError_t VbGetLocalizationCount(VbCommonParams* cparams,
                                        uint32_t* count) {
  GoogleBinaryBlockHeader* gbb = (GoogleBinaryBlockHeader*)cparams->gbb_data;
  BmpBlockHeader* hdr;

  /* Default to 0 on error */
  *count = 0;

  /* Make sure the bitmap data is inside the GBB and is non-zero in size */
  if (0 == gbb->bmpfv_size ||
      gbb->bmpfv_offset > cparams->gbb_size ||
      gbb->bmpfv_offset + gbb->bmpfv_size > cparams->gbb_size) {
    return VBERROR_INVALID_GBB;
  }

  /* Sanity-check the bitmap block header */
  hdr = (BmpBlockHeader *)(((uint8_t*)gbb) + gbb->bmpfv_offset);
  if ((0 != Memcmp(hdr->signature, BMPBLOCK_SIGNATURE,
                   BMPBLOCK_SIGNATURE_SIZE)) ||
      (hdr->major_version > BMPBLOCK_MAJOR_VERSION) ||
      ((hdr->major_version == BMPBLOCK_MAJOR_VERSION) &&
       (hdr->minor_version > BMPBLOCK_MINOR_VERSION))) {
    return VBERROR_INVALID_BMPFV;
  }

  *count = hdr->number_of_localizations;
  return VBERROR_SUCCESS;
}



/* Display a screen from the GBB. */
VbError_t VbDisplayScreenFromGBB(VbCommonParams* cparams, uint32_t screen,
                                 VbNvContext *vncptr) {
  GoogleBinaryBlockHeader* gbb = (GoogleBinaryBlockHeader*)cparams->gbb_data;
  uint8_t* bmpfv = NULL;
  uint8_t* fullimage = NULL;
  BmpBlockHeader* hdr;
  ScreenLayout* layout;
  ImageInfo* image_info;
  uint32_t screen_index;
  uint32_t localization = 0;
  VbError_t retval = VBERROR_UNKNOWN;  /* Assume error until proven ok */
  uint32_t inoutsize;
  uint32_t offset;
  uint32_t i;

  /* Make sure the bitmap data is inside the GBB and is non-zero in size */
  if (0 == gbb->bmpfv_size ||
      gbb->bmpfv_offset > cparams->gbb_size ||
      gbb->bmpfv_offset + gbb->bmpfv_size > cparams->gbb_size) {
    VBDEBUG(("VbDisplayScreenFromGBB(): invalid bmpfv offset/size\n"));
    return VBERROR_INVALID_GBB;
  }

  /* Copy bitmap data from GBB into RAM for speed */
  bmpfv = (uint8_t*)VbExMalloc(gbb->bmpfv_size);
  Memcpy(bmpfv, ((uint8_t*)gbb) + gbb->bmpfv_offset, gbb->bmpfv_size);

  /* Sanity-check the bitmap block header */
  hdr = (BmpBlockHeader *)bmpfv;
  if ((0 != Memcmp(hdr->signature, BMPBLOCK_SIGNATURE,
                   BMPBLOCK_SIGNATURE_SIZE)) ||
      (hdr->major_version > BMPBLOCK_MAJOR_VERSION) ||
      ((hdr->major_version == BMPBLOCK_MAJOR_VERSION) &&
       (hdr->minor_version > BMPBLOCK_MINOR_VERSION))) {
    VBDEBUG(("VbDisplayScreenFromGBB(): invalid/too new bitmap header\n"));
    retval = VBERROR_INVALID_BMPFV;
    goto VbDisplayScreenFromGBB_exit;
  }

  /* Translate screen ID into index.  Note that not all screens are in the
   * GBB. */
  /* TODO: ensure screen IDs match indices?  Having this translation
   * here is awful. */
  switch (screen) {
    case VB_SCREEN_DEVELOPER_WARNING:
      screen_index = 0;
      break;
    case VB_SCREEN_RECOVERY_REMOVE:
      screen_index = 1;
      break;
    case VB_SCREEN_RECOVERY_NO_GOOD:
      screen_index = 2;
      break;
    case VB_SCREEN_RECOVERY_INSERT:
      screen_index = 3;
      break;
    case VB_SCREEN_BLANK:
    case VB_SCREEN_DEVELOPER_EGG:
    default:
      /* Screens which aren't in the GBB */
      VBDEBUG(("VbDisplayScreenFromGBB(): screen %d not in the GBB\n",
               (int)screen));
      retval = VBERROR_INVALID_SCREEN_INDEX;
      goto VbDisplayScreenFromGBB_exit;
  }
  if (screen_index >= hdr->number_of_screenlayouts) {
    VBDEBUG(("VbDisplayScreenFromGBB(): screen %d index %d not in the GBB\n",
             (int)screen, (int)screen_index));
    retval = VBERROR_INVALID_SCREEN_INDEX;
    goto VbDisplayScreenFromGBB_exit;
  }

  /* Clip localization to the number of localizations present in the GBB */
  VbNvGet(vncptr, VBNV_LOCALIZATION_INDEX, &localization);
  if (localization >= hdr->number_of_localizations) {
    localization = 0;
    VbNvSet(vncptr, VBNV_LOCALIZATION_INDEX, localization);
  }

  /* Calculate offset of screen layout = start of screen stuff +
   * correct locale + correct screen. */
  offset = sizeof(BmpBlockHeader) +
      localization * hdr->number_of_screenlayouts * sizeof(ScreenLayout) +
      screen_index * sizeof(ScreenLayout);
  VBDEBUG(("VbDisplayScreenFromGBB(): scr_%d_%d at offset 0x%x\n",
           localization, screen_index, offset));
  layout = (ScreenLayout*)(bmpfv + offset);

  /* Display all bitmaps for the image */
  for (i = 0; i < MAX_IMAGE_IN_LAYOUT; i++) {
    if (layout->images[i].image_info_offset) {
      offset = layout->images[i].image_info_offset;
      image_info = (ImageInfo*)(bmpfv + offset);
      VBDEBUG(("VbDisplayScreenFromGBB: image %d: %dx%d+%d+%d %d/%d"
               "tag %d at 0x%x\n",
               i, image_info->width, image_info->height,
               layout->images[i].x, layout->images[i].y,
               image_info->compressed_size, image_info->original_size,
               image_info->tag, offset));
      if (COMPRESS_NONE != image_info->compression) {
        inoutsize = image_info->original_size;
        fullimage = (uint8_t*)VbExMalloc(inoutsize);
        retval = VbExDecompress(bmpfv + offset + sizeof(ImageInfo),
                                image_info->compressed_size,
                                image_info->compression,
                                fullimage, &inoutsize);
        if (VBERROR_SUCCESS != retval) {
          VbExFree(fullimage);
          goto VbDisplayScreenFromGBB_exit;
        }
        retval = VbExDisplayImage(layout->images[i].x, layout->images[i].y,
                                  fullimage, inoutsize);
        VbExFree(fullimage);
      } else {
        retval = VbExDisplayImage(layout->images[i].x, layout->images[i].y,
                                  bmpfv + offset + sizeof(ImageInfo),
                                  image_info->original_size);
      }
      if (VBERROR_SUCCESS != retval)
        goto VbDisplayScreenFromGBB_exit;
    }
  }

  /* Successful if all bitmaps displayed */
  retval = VBERROR_SUCCESS;

VbDisplayScreenFromGBB_exit:

  /* Free the bitmap data copy */
  VbExFree(bmpfv);
  return retval;
}


/* Display a screen, initializing the display if necessary.  If force!=0,
 * redisplays the screen even if it's the same as the current screen. */
VbError_t VbDisplayScreen(VbCommonParams* cparams, uint32_t screen, int force,
                          VbNvContext *vncptr) {
  VbError_t retval;

  VBDEBUG(("VbDisplayScreen(%d, %d)\n", (int)screen, force));

  /* Initialize display if necessary */
  if (!disp_width) {
    retval = VbExDisplayInit(&disp_width, &disp_height);
    if (VBERROR_SUCCESS != retval)
      return retval;
  }

  /* If the requested screen is the same as the current one, we're done. */
  if (disp_current_screen == screen && 0 == force)
    return VBERROR_SUCCESS;

  /* If the screen is blank, turn off the backlight; else turn it on. */
  VbExDisplayBacklight(VB_SCREEN_BLANK == screen ? 0 : 1);

  /* Request the screen */
  disp_current_screen = screen;

  /* Look in the GBB first */
  if (VBERROR_SUCCESS == VbDisplayScreenFromGBB(cparams, screen, vncptr))
    return VBERROR_SUCCESS;

  /* If the screen wasn't in the GBB bitmaps, fall back to a default screen. */
  return VbExDisplayScreen(screen);
}


#define DEBUG_INFO_SIZE 512

/* Display debug info to the screen */
VbError_t VbDisplayDebugInfo(VbCommonParams* cparams, VbNvContext *vncptr) {
  VbSharedDataHeader* shared = (VbSharedDataHeader*)cparams->shared_data_blob;
  GoogleBinaryBlockHeader* gbb = (GoogleBinaryBlockHeader*)cparams->gbb_data;
  char buf[DEBUG_INFO_SIZE] = "";
  uint32_t used = 0;
  uint32_t i;

  /* Redisplay the current screen, to overwrite any previous debug output */
  VbDisplayScreen(cparams, disp_current_screen, 1, vncptr);

  /* Add hardware ID */
  used += Strncat(buf + used, "HWID: ", DEBUG_INFO_SIZE - used);
  if (0 == gbb->hwid_size ||
      gbb->hwid_offset > cparams->gbb_size ||
      gbb->hwid_offset + gbb->hwid_size > cparams->gbb_size) {
    VBDEBUG(("VbCheckDisplayKey(): invalid hwid offset/size\n"));
    used += Strncat(buf + used, "(INVALID)", DEBUG_INFO_SIZE - used);
  } else {
    used += Strncat(buf + used, (char*)((uint8_t*)gbb + gbb->hwid_offset),
                    DEBUG_INFO_SIZE - used);
  }

  /* Add recovery reason */
  used += Strncat(buf + used, "\nrecovery_reason: 0x", DEBUG_INFO_SIZE - used);
  used += Uint64ToString(buf + used, DEBUG_INFO_SIZE - used,
                         shared->recovery_reason, 16, 2);

  /* Add VbSharedData flags */
  used += Strncat(buf + used, "\nVbSD.flags: 0x", DEBUG_INFO_SIZE - used);
  used += Uint64ToString(buf + used, DEBUG_INFO_SIZE - used,
                         shared->flags, 16, 8);

  /* Add raw contents of VbNvStorage */
  used += Strncat(buf + used, "\nVbNv.raw:", DEBUG_INFO_SIZE - used);
  for (i = 0; i < VBNV_BLOCK_SIZE; i++) {
    used += Strncat(buf + used, " ", DEBUG_INFO_SIZE - used);
    used += Uint64ToString(buf + used, DEBUG_INFO_SIZE - used,
                           vncptr->raw[i], 16, 2);
  }

  /* Add dev_boot_usb flag */
  VbNvGet(vncptr, VBNV_DEV_BOOT_USB, &i);
  used += Strncat(buf + used, "\ndev_boot_usb: ", DEBUG_INFO_SIZE - used);
  used += Uint64ToString(buf + used, DEBUG_INFO_SIZE - used, i, 10, 0);

  /* Add TPM versions */
  used += Strncat(buf + used, "\nTPM: fwver=0x", DEBUG_INFO_SIZE - used);
  used += Uint64ToString(buf + used, DEBUG_INFO_SIZE - used,
                         shared->fw_version_tpm, 16, 8);
  used += Strncat(buf + used, " kernver=0x", DEBUG_INFO_SIZE - used);
  used += Uint64ToString(buf + used, DEBUG_INFO_SIZE - used,
                         shared->kernel_version_tpm, 16, 8);

  /* Add GBB flags */
  used += Strncat(buf + used, "\ngbb.flags: 0x", DEBUG_INFO_SIZE - used);
  if (gbb->major_version == GBB_MAJOR_VER && gbb->minor_version >= 1) {
    used += Uint64ToString(buf + used, DEBUG_INFO_SIZE - used,
                           gbb->flags, 16, 8);
  } else {
    used += Strncat(buf + used, "0 (default)", DEBUG_INFO_SIZE - used);
  }

  /* Make sure we finish with a newline */
  used += Strncat(buf + used, "\n", DEBUG_INFO_SIZE - used);

  /* TODO: add more interesting data:
   * - SHA1 of kernel subkey (assuming we always set it in VbSelectFirmware,
   *   even in recovery mode, where we just copy it from the root key)
   * - Information on current disks */

  buf[DEBUG_INFO_SIZE - 1] = '\0';
  return VbExDisplayDebugInfo(buf);
}


VbError_t VbCheckDisplayKey(VbCommonParams* cparams, uint32_t key,
                            VbNvContext *vncptr) {

  if ('\t' == key) {
    /* Tab = display debug info */
    return VbDisplayDebugInfo(cparams, vncptr);

  } else if (VB_KEY_LEFT == key || VB_KEY_RIGHT == key) {
    /* Arrow keys = change localization */
    uint32_t loc = 0;
    uint32_t count = 0;

    VbNvGet(vncptr, VBNV_LOCALIZATION_INDEX, &loc);
    if (VBERROR_SUCCESS != VbGetLocalizationCount(cparams, &count))
      loc = 0;  /* No localization count (bad GBB?), so set to 0 (default) */
    else if (VB_KEY_RIGHT == key)
      loc = (loc < count - 1 ? loc + 1 : 0);
    else
      loc = (loc > 0 ? loc - 1 : count - 1);
    VBDEBUG(("VbCheckDisplayKey() - change localization to %d\n", (int)loc));
    VbNvSet(vncptr, VBNV_LOCALIZATION_INDEX, loc);

    /* Force redraw of current screen */
    return VbDisplayScreen(cparams, disp_current_screen, 1, vncptr);
  }

  return VBERROR_SUCCESS;
}