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authorH. Peter Anvin <hpa@zytor.com>2008-07-17 11:29:24 -0700
committerH. Peter Anvin <hpa@zytor.com>2008-07-17 11:29:24 -0700
commit4fdf08b5bf8d449cc9897395895157c6ff8ddc41 (patch)
tree1f4cac0e1d7ef89bf24ba3fc9c0676f679aaaf4c /include/asm-x86/segment.h
parent5b664cb235e97afbf34db9c4d77f08ebd725335e (diff)
x86: unify and correct the GDT_ENTRY() macro
Merge the GDT_ENTRY() macro between arch/x86/boot/pm.c and arch/x86/kernel/acpi/sleep.c and put the new one in <asm-x86/segment.h>. While we're at it, correct the bitmasks for the limit and flags. The new version relies on using ULL constants in order to cause type promotion rather than explicit casts; this avoids having to include <linux/types.h> in <asm-x86/segments.h>. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include/asm-x86/segment.h')
-rw-r--r--include/asm-x86/segment.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-x86/segment.h b/include/asm-x86/segment.h
index dfc8601c089..646452ea9ea 100644
--- a/include/asm-x86/segment.h
+++ b/include/asm-x86/segment.h
@@ -1,6 +1,15 @@
#ifndef _ASM_X86_SEGMENT_H_
#define _ASM_X86_SEGMENT_H_
+/* Constructor for a conventional segment GDT (or LDT) entry */
+/* This is a macro so it can be used in initializers */
+#define GDT_ENTRY(flags, base, limit) \
+ ((((base) & 0xff000000ULL) << (56-24)) | \
+ (((flags) & 0x0000f0ffULL) << 40) | \
+ (((limit) & 0x000f0000ULL) << (48-16)) | \
+ (((base) & 0x00ffffffULL) << 16) | \
+ (((limit) & 0x0000ffffULL)))
+
/* Simple and small GDT entries for booting only */
#define GDT_ENTRY_BOOT_CS 2