[x86 setup 12/33] x86-64: add symbolic constants for the boot segment selectors

[H. Peter Anvin]

From: H. Peter Anvin <hpa@xxxxxxxxx>

Add symbolic constants for the segment selectors/GDT slots used by
the setup code, for consistency with i386.

Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
---
 include/asm-x86_64/segment.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/include/asm-x86_64/segment.h b/include/asm-x86_64/segment.h
index adf2bf1..04b8ab2 100644
--- a/include/asm-x86_64/segment.h
+++ b/include/asm-x86_64/segment.h
@@ -3,6 +3,14 @@
 
 #include <asm/cache.h>
 
+/* Simple and small GDT entries for booting only */
+
+#define GDT_ENTRY_BOOT_CS		2
+#define __BOOT_CS	(GDT_ENTRY_BOOT_CS * 8)
+
+#define GDT_ENTRY_BOOT_DS		(GDT_ENTRY_BOOT_CS + 1)
+#define __BOOT_DS	(GDT_ENTRY_BOOT_DS * 8)
+
 #define __KERNEL_CS	0x10
 #define __KERNEL_DS	0x18
 
-- 
1.5.2.2

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