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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>
This commit is contained in:
Roland McGrath 2008-01-30 13:30:48 +01:00 committed by Ingo Molnar
parent fb7fa8f174
commit 2608a6584a
1 changed files with 11 additions and 0 deletions
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11
include/asm-x86/segment_64.h
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@ -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