[PATCH v2 03/13] x86: Add macro for 64bit entry startup_64

[Yinghai Lu]

We will add one 64bit entry for bzImage in boot header struct.

the contents in that field will be offset of startup_64.

Add macro for offset of startup_64 to keep two places consistent.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Matt Fleming <matt.fleming@xxxxxxxxx>
---
 arch/x86/boot/compressed/head_64.S |    2 +-
 arch/x86/include/asm/boot.h        |    2 ++
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 375af23..e4964dd 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -195,7 +195,7 @@ no_longmode:
 	 * it may change in the future.
 	 */
 	.code64
-	.org 0x200
+	.org BOOT_CODE64_START_OFFSET
 ENTRY(startup_64)
 	/*
 	 * We come here either from startup_32 or directly from a
diff --git a/arch/x86/include/asm/boot.h b/arch/x86/include/asm/boot.h
index b13fe63..ef36497 100644
--- a/arch/x86/include/asm/boot.h
+++ b/arch/x86/include/asm/boot.h
@@ -38,8 +38,10 @@
 
 #ifdef CONFIG_X86_64
 #define BOOT_STACK_SIZE	0x4000
+#define BOOT_CODE64_START_OFFSET 0x200
 #else
 #define BOOT_STACK_SIZE	0x1000
+#define BOOT_CODE64_START_OFFSET 0
 #endif
 
 #endif /* __KERNEL__ */
-- 
1.7.7

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