[PATCH 1/1] efi_loader: add Linux magic to aarch64 crt0

[Heinrich Schuchardt]

Add the Linux magic to the EFI file header to allow running our test
programs with GRUB's linux command. This will allow us to dump the fixed-up
device tree with our dtbdump.efi tool.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 arch/arm/lib/crt0_aarch64_efi.S | 3 ++-
 include/asm-generic/pe.h        | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/lib/crt0_aarch64_efi.S b/arch/arm/lib/crt0_aarch64_efi.S
index 368933ecf2..492195f765 100644
--- a/arch/arm/lib/crt0_aarch64_efi.S
+++ b/arch/arm/lib/crt0_aarch64_efi.S
@@ -18,7 +18,8 @@
 	.globl	ImageBase
 ImageBase:
 	.short	IMAGE_DOS_SIGNATURE		/* 'MZ' */
-	.skip	58				/* 'MZ' + pad + offset == 64 */
+	.skip	54				/* 'MZ' + pad + offset == 64 */
+	.long   LINUX_ARM64_MAGIC		/* For GRUB's linux command */
 	.long	pe_header - ImageBase		/* Offset to the PE header */
 pe_header:
 	.long	IMAGE_NT_SIGNATURE		/* 'PE' */
diff --git a/include/asm-generic/pe.h b/include/asm-generic/pe.h
index b247519a3d..a1df747134 100644
--- a/include/asm-generic/pe.h
+++ b/include/asm-generic/pe.h
@@ -51,4 +51,6 @@
 #define IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER	12
 #define IMAGE_SUBSYSTEM_EFI_ROM			13

+#define LINUX_ARM64_MAGIC			0x644d5241
+
 #endif /* _ASM_PE_H */
--
2.29.2