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    Subject[PATCH 02/27] x86: segment selector macros
    Date

    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>
    ---
    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
    -
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