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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Ard Biesheuvel <ardb@kernel.org>
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include/linux/pe.h
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include/linux/pe.h
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#include <linux/types.h>
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#define LINUX_EFISTUB_MAJOR_VERSION 0x0
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/*
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* Linux EFI stub v1.0 adds the following functionality:
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* - Loading initrd from the LINUX_EFI_INITRD_MEDIA_GUID device path,
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* - Loading/starting the kernel from firmware that targets a different
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* machine type, via the entrypoint exposed in the .compat PE/COFF section.
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*
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* The recommended way of loading and starting v1.0 or later kernels is to use
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* the LoadImage() and StartImage() EFI boot services, and expose the initrd
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* via the LINUX_EFI_INITRD_MEDIA_GUID device path.
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*
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* Versions older than v1.0 support initrd loading via the image load options
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* (using initrd=, limited to the volume from which the kernel itself was
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* loaded), or via arch specific means (bootparams, DT, etc).
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*
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* On x86, LoadImage() and StartImage() can be omitted if the EFI handover
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* protocol is implemented, which can be inferred from the version,
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* handover_offset and xloadflags fields in the bootparams structure.
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*/
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#define LINUX_EFISTUB_MAJOR_VERSION 0x1
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#define LINUX_EFISTUB_MINOR_VERSION 0x0
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#define MZ_MAGIC 0x5a4d /* "MZ" */