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

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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: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2020-02-20 11:57:20 +01:00
parent 148d3f716c
commit dc235d62fc
1 changed files with 19 additions and 1 deletions
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20
include/linux/pe.h
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@ -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" */