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authorRoy Franz <roy.franz@linaro.org>2013-08-15 00:10:00 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2013-08-22 11:45:04 +0100
commit4370eec05a887b0cd4392cd5dc5b2713174745c0 (patch)
treef4d125163eef7b312ae2fcae8fa2b60e562d75c8
parent360b35a874f130305715b1b854b67dc40826fc91 (diff)
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>
-rw-r--r--Documentation/arm64/booting.txt16
-rw-r--r--arch/arm64/kernel/head.S8
2 files changed, 21 insertions, 3 deletions
diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
index 9c4d388daddc..5273c4d60e65 100644
--- a/Documentation/arm64/booting.txt
+++ b/Documentation/arm64/booting.txt
@@ -68,13 +68,23 @@ Image target is available instead.
Requirement: MANDATORY
-The decompressed kernel image contains a 32-byte header as follows:
+The decompressed kernel image contains a 64-byte header as follows:
- u32 magic = 0x14000008; /* branch to stext, little-endian */
- u32 res0 = 0; /* reserved */
+ u32 code0; /* Executable code */
+ u32 code1; /* Executable code */
u64 text_offset; /* Image load offset */
+ u64 res0 = 0; /* reserved */
u64 res1 = 0; /* reserved */
u64 res2 = 0; /* reserved */
+ u64 res3 = 0; /* reserved */
+ u64 res4 = 0; /* reserved */
+ u32 magic = 0x644d5241; /* Magic number, little endian, "ARM\x64" */
+ u32 res5 = 0; /* reserved */
+
+
+Header notes:
+
+- code0/code1 are responsible for branching to stext.
The image must be placed at the specified offset (currently 0x80000)
from the start of the system RAM and called there. The start of the
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