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-rw-r--r--include/linux/pe.h21
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" */