mirror of https://github.com/acidanthera/audk.git
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
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/** @file
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Copyright (c) 2013-2014, ARM Ltd. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "AndroidFastbootApp.h"
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#define BOOT_MAGIC "ANDROID!"
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#define BOOT_MAGIC_LENGTH sizeof (BOOT_MAGIC) - 1
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// Check Val (unsigned) is a power of 2 (has only one bit set)
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#define IS_POWER_OF_2(Val) (Val != 0 && ((Val & (Val - 1)) == 0))
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// No documentation for this really - sizes of fields has been determined
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// empirically.
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#pragma pack(1)
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typedef struct {
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CHAR8 BootMagic[BOOT_MAGIC_LENGTH];
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UINT32 KernelSize;
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UINT32 KernelAddress;
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UINT32 RamdiskSize;
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UINT32 RamdiskAddress;
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UINT32 SecondStageBootloaderSize;
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UINT32 SecondStageBootloaderAddress;
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UINT32 KernelTaggsAddress;
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UINT32 PageSize;
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UINT32 Reserved[2];
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CHAR8 ProductName[16];
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CHAR8 KernelArgs[BOOTIMG_KERNEL_ARGS_SIZE];
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UINT32 Id[32];
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} ANDROID_BOOTIMG_HEADER;
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#pragma pack()
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// Find the kernel and ramdisk in an Android boot.img.
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// return EFI_INVALID_PARAMTER if the boot.img is invalid (i.e. doesn't have the
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// right magic value),
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// return EFI_NOT_FOUND if there was no kernel in the boot.img.
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// Note that the Ramdisk is optional - *Ramdisk won't be touched if it isn't
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// present, but RamdiskSize will be set to 0.
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EFI_STATUS
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ParseAndroidBootImg (
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IN VOID *BootImg,
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OUT VOID **Kernel,
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OUT UINTN *KernelSize,
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OUT VOID **Ramdisk,
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OUT UINTN *RamdiskSize,
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OUT CHAR8 *KernelArgs
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)
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{
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ANDROID_BOOTIMG_HEADER *Header;
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UINT8 *BootImgBytePtr;
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// Cast to UINT8 so we can do pointer arithmetic
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BootImgBytePtr = (UINT8 *) BootImg;
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Header = (ANDROID_BOOTIMG_HEADER *) BootImg;
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if (AsciiStrnCmp (Header->BootMagic, BOOT_MAGIC, BOOT_MAGIC_LENGTH) != 0) {
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return EFI_INVALID_PARAMETER;
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}
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if (Header->KernelSize == 0) {
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return EFI_NOT_FOUND;
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}
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ASSERT (IS_POWER_OF_2 (Header->PageSize));
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*KernelSize = Header->KernelSize;
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*Kernel = BootImgBytePtr + Header->PageSize;
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*RamdiskSize = Header->RamdiskSize;
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if (Header->RamdiskSize != 0) {
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*Ramdisk = (VOID *) (BootImgBytePtr
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+ Header->PageSize
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+ ALIGN_VALUE (Header->KernelSize, Header->PageSize));
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}
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AsciiStrnCpy (KernelArgs, Header->KernelArgs, BOOTIMG_KERNEL_ARGS_SIZE);
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return EFI_SUCCESS;
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}
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