EmbeddedPkg/Application/AndroidFastboot/AndroidBootImg.c

   1 /** @file
   2
   3   Copyright (c) 2013-2014, ARM Ltd. All rights reserved.<BR>
   4
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "AndroidFastbootApp.h"
  16
  17 // Find the kernel and ramdisk in an Android boot.img.
  18 // return EFI_INVALID_PARAMTER if the boot.img is invalid (i.e. doesn't have the
  19 //  right magic value),
  20 // return EFI_NOT_FOUND if there was no kernel in the boot.img.
  21 // Note that the Ramdisk is optional - *Ramdisk won't be touched if it isn't
  22 // present, but RamdiskSize will be set to 0.
  23 EFI_STATUS
  24 ParseAndroidBootImg (
  25   IN  VOID    *BootImg,
  26   OUT VOID   **Kernel,
  27   OUT UINTN   *KernelSize,
  28   OUT VOID   **Ramdisk,
  29   OUT UINTN   *RamdiskSize,
  30   OUT CHAR8   *KernelArgs
  31   )
  32 {
  33   ANDROID_BOOTIMG_HEADER   *Header;
  34   UINT8                    *BootImgBytePtr;
  35
  36   // Cast to UINT8 so we can do pointer arithmetic
  37   BootImgBytePtr = (UINT8 *) BootImg;
  38
  39   Header = (ANDROID_BOOTIMG_HEADER *) BootImg;
  40
  41   if (AsciiStrnCmp ((CONST CHAR8 *)Header->BootMagic, ANDROID_BOOT_MAGIC,
  42                     ANDROID_BOOT_MAGIC_LENGTH) != 0) {
  43     return EFI_INVALID_PARAMETER;
  44   }
  45
  46   if (Header->KernelSize == 0) {
  47     return EFI_NOT_FOUND;
  48   }
  49
  50   ASSERT (IS_VALID_ANDROID_PAGE_SIZE (Header->PageSize));
  51
  52   *KernelSize = Header->KernelSize;
  53   *Kernel = BootImgBytePtr + Header->PageSize;
  54   *RamdiskSize = Header->RamdiskSize;
  55
  56   if (Header->RamdiskSize != 0) {
  57     *Ramdisk = (VOID *) (BootImgBytePtr
  58                  + Header->PageSize
  59                  + ALIGN_VALUE (Header->KernelSize, Header->PageSize));
  60   }
  61
  62   AsciiStrnCpyS (KernelArgs, ANDROID_BOOTIMG_KERNEL_ARGS_SIZE, Header->KernelArgs,
  63     ANDROID_BOOTIMG_KERNEL_ARGS_SIZE);
  64
  65   return EFI_SUCCESS;
  66 }