arm64: Expand arm64 image header

Expand the arm64 image header to allow for co-existance with
PE/COFF header required by the EFI stub.  The PE/COFF format
requires the "MZ" header to be at offset 0, and the offset
to the PE/COFF header to be at offset 0x3c.  The image
header is expanded to allow 2 instructions at the beginning
to accommodate a benign intruction at offset 0 that includes
the "MZ" header, a magic number, and the offset to the PE/COFF
header.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 53dcae49e729..7090c126797c 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -112,6 +112,14 @@
         .quad   TEXT_OFFSET                     // Image load offset from start of RAM
         .quad   0                               // reserved
         .quad   0                               // reserved
+        .quad   0                               // reserved
+        .quad   0                               // reserved
+        .quad   0                               // reserved
+        .byte   0x41                            // Magic number, "ARM\x64"
+        .byte   0x52
+        .byte   0x4d
+        .byte   0x64
+        .word   0                               // reserved
 
 ENTRY(stext)
         mov     x21, x0                         // x21=FDT