diff options
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 04b8ab21328f..dce742101348 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 |