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_PARAMETER 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
ParseAndroidBootImg(IN VOID * BootImg,OUT VOID ** Kernel,OUT UINTN * KernelSize,OUT VOID ** Ramdisk,OUT UINTN * RamdiskSize,OUT CHAR8 * KernelArgs)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 }
61