Commit 2608a658 authored Jan 30, 2008 by Roland McGrath Committed by Ingo Molnar Jan 30, 2008

x86: segment selector macros



This copies into asm-x86/segment_64.h some macros from asm-x86/segment_32.h
for dissecting segment selectors.  This lets other code use these macros
uniformly on 32/64-bit rather than duplicating the constants elsewhere.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent fb7fa8f1

include/asm-x86/segment_64.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -50,4 +50,15 @@
		#define GDT_SIZE (GDT_ENTRIES * 8)
		#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)

		/* Bottom two bits of selector give the ring privilege level */
		#define SEGMENT_RPL_MASK 0x3
		/* Bit 2 is table indicator (LDT/GDT) */
		#define SEGMENT_TI_MASK 0x4

		/* User mode is privilege level 3 */
		#define USER_RPL 0x3
		/* LDT segment has TI set, GDT has it cleared */
		#define SEGMENT_LDT 0x4
		#define SEGMENT_GDT 0x0

		#endif