diff options
Diffstat (limited to 'include/linux/pe.h')
| -rw-r--r-- | include/linux/pe.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/pe.h b/include/linux/pe.h index c86bd3a2f70f..8ad71d763a77 100644 --- a/include/linux/pe.h +++ b/include/linux/pe.h @@ -10,6 +10,27 @@ #include <linux/types.h> +/* + * 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" */ #define PE_MAGIC 0x00004550 /* "PE\0\0" */ |