EmbeddedPkg/Application/AndroidFastboot/AndroidBootImg.c

   1 /** @file
   2
   3   Copyright (c) 2013-2014, ARM Ltd. All rights reserved.<BR>
   4
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "AndroidFastbootApp.h"
  10
  11 // Find the kernel and ramdisk in an Android boot.img.
  12 // return EFI_INVALID_PARAMTER if the boot.img is invalid (i.e. doesn't have the
  13 //  right magic value),
  14 // return EFI_NOT_FOUND if there was no kernel in the boot.img.
  15 // Note that the Ramdisk is optional - *Ramdisk won't be touched if it isn't
  16 // present, but RamdiskSize will be set to 0.
  17 EFI_STATUS
  18 ParseAndroidBootImg (
  19   IN  VOID    *BootImg,
  20   OUT VOID   **Kernel,
  21   OUT UINTN   *KernelSize,
  22   OUT VOID   **Ramdisk,
  23   OUT UINTN   *RamdiskSize,
  24   OUT CHAR8   *KernelArgs
  25   )
  26 {
  27   ANDROID_BOOTIMG_HEADER   *Header;
  28   UINT8                    *BootImgBytePtr;
  29
  30   // Cast to UINT8 so we can do pointer arithmetic
  31   BootImgBytePtr = (UINT8 *) BootImg;
  32
  33   Header = (ANDROID_BOOTIMG_HEADER *) BootImg;
  34
  35   if (AsciiStrnCmp ((CONST CHAR8 *)Header->BootMagic, ANDROID_BOOT_MAGIC,
  36                     ANDROID_BOOT_MAGIC_LENGTH) != 0) {
  37     return EFI_INVALID_PARAMETER;
  38   }
  39
  40   if (Header->KernelSize == 0) {
  41     return EFI_NOT_FOUND;
  42   }
  43
  44   ASSERT (IS_VALID_ANDROID_PAGE_SIZE (Header->PageSize));
  45
  46   *KernelSize = Header->KernelSize;
  47   *Kernel = BootImgBytePtr + Header->PageSize;
  48   *RamdiskSize = Header->RamdiskSize;
  49
  50   if (Header->RamdiskSize != 0) {
  51     *Ramdisk = (VOID *) (BootImgBytePtr
  52                  + Header->PageSize
  53                  + ALIGN_VALUE (Header->KernelSize, Header->PageSize));
  54   }
  55
  56   AsciiStrnCpyS (KernelArgs, ANDROID_BOOTIMG_KERNEL_ARGS_SIZE, Header->KernelArgs,
  57     ANDROID_BOOTIMG_KERNEL_ARGS_SIZE);
  58
  59   return EFI_SUCCESS;
  60 }