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| author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:30:48 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:48 +0100 |
| commit | 2608a6584a0a32d3251dfafad31d9f8b2c784466 (patch) | |
| tree | 3d790ff15328fe7879cfbe003f1f0e23a91654be /include | |
| parent | fb7fa8f1741c91f6c6e958762155abe9339476ca (diff) | |
| download | op-kernel-dev-2608a6584a0a32d3251dfafad31d9f8b2c784466.zip op-kernel-dev-2608a6584a0a32d3251dfafad31d9f8b2c784466.tar.gz | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-x86/segment_64.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/asm-x86/segment_64.h b/include/asm-x86/segment_64.h index 04b8ab2..dce7421 100644 --- a/include/asm-x86/segment_64.h +++ b/include/asm-x86/segment_64.h @@ -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 |
