[16/16] ARM: 8079/1: zImage: identify kernel endianness

Message ID 1418797379-107848-17-git-send-email-shengyong1@huawei.com
State New
Headers show

Commit Message

Sheng Yong Dec. 17, 2014, 6:22 a.m.
From: Nicolas Pitre <nicolas.pitre@linaro.org>

commit 9696fcae9251610f5935a3823be40d1365649720 upstream

With patch #8067/1 ("zImage: ensure header in LE format for BE8 kernels")
applied, it is no longer possible to determine the endianness of a compiled
kernel image.  This normally shouldn't matter to the boot environment,
except for those cases where the selection of a ramdisk or root filesystem
with a matching endianness has to be automated.

Let's add a flag to the zImage header indicating the actual endianness.
Four bytes from offset 0x30 can be interpreted as follows:

        04 03 02 01     big endian kernel

        01 02 03 04     little endian kernel

Anything else should be interpreted as "unknown", in which case it is
most likely that patch #8067/1 was not applied either and the zImage
magic number at offset 0x24 could be used instead to determine
endianness. No zImage before this patch ever produced 0x01020304 nor
0x04030201 at offset 0x30 so there is no confusion possible.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
 arch/arm/boot/compressed/head.S | 1 +
 1 file changed, 1 insertion(+)


diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index ac7ff2a..d087554 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -133,6 +133,7 @@  start:
 		.word	_magic_sig	@ Magic numbers to help the loader
 		.word	_magic_start	@ absolute load/run zImage address
 		.word	_magic_end	@ zImage end address
+		.word	0x04030201	@ endianness flag
  THUMB(		.thumb			)