arm64: efi: add EFI stub

This patch adds PE/COFF header fields to the start of the kernel
Image so that it appears as an EFI application to UEFI firmware.
An EFI stub is included to allow direct booting of the kernel
Image.

Signed-off-by: Mark Salter <msalter@redhat.com>
[Add support in PE/COFF header for signed images]
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 82e21de5db3b..6c71f122638d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -290,8 +290,9 @@ config EFI
         help
           This option provides support for runtime services provided
           by UEFI firmware (such as non-volatile variables, realtime
-          clock, and platform reset). This is only useful on systems
-          that have UEFI firmware.
+          clock, and platform reset). A UEFI stub is also provided to
+          allow the kernel to be booted as an EFI application. This
+          is only useful on systems that have UEFI firmware.
 
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