Commit dc235d62 authored by Ard Biesheuvel's avatar Ard Biesheuvel
Browse files

efi: Bump the Linux EFI stub major version number to #1 



Now that we have introduced new, generic ways for the OS loader to
interface with Linux kernels during boot, we need to record this
fact in a way that allows loaders to discover this information, and
fall back to the existing methods for older kernels.

Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
parent 148d3f71

include/linux/pe.h

+19 −1
Original line number Diff line number Diff line
@@ -10,7 +10,25 @@ 


#include <linux/types.h>



#define LINUX_EFISTUB_MAJOR_VERSION		0x0

/*

 * Linux EFI stub v1.0 adds the following functionality:

 * - Loading initrd from the LINUX_EFI_INITRD_MEDIA_GUID device path,

 * - Loading/starting the kernel from firmware that targets a different

 *   machine type, via the entrypoint exposed in the .compat PE/COFF section.

 *

 * The recommended way of loading and starting v1.0 or later kernels is to use

 * the LoadImage() and StartImage() EFI boot services, and expose the initrd

 * via the LINUX_EFI_INITRD_MEDIA_GUID device path.

 *

 * Versions older than v1.0 support initrd loading via the image load options

 * (using initrd=, limited to the volume from which the kernel itself was

 * loaded), or via arch specific means (bootparams, DT, etc).

 *

 * On x86, LoadImage() and StartImage() can be omitted if the EFI handover

 * protocol is implemented, which can be inferred from the version,

 * handover_offset and xloadflags fields in the bootparams structure.

 */

#define LINUX_EFISTUB_MAJOR_VERSION		0x1

#define LINUX_EFISTUB_MINOR_VERSION		0x0



#define MZ_MAGIC	0x5a4d	/* "MZ" */

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