commit 8afd2af88921c2cb1c9540cecd0714da7ae4fcd0
author H. Peter Anvin <hpa@zytor.com> Wed Jul 11 12:18:37 2007 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Thu Jul 12 10:55:54 2007 -0700
tree 162a4de59d8dab371f5568bf37ea7de7af59115f
parent 77e1dd654bc24182a7ad34f415abd488ae7af6eb

x86-64: add symbolic constants for the boot segment selectors

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@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-x86_64/segment.h

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