x86: segment selector macros

[mv-sheeva.git] / include / asm-x86 / segment_64.h

diff --git a/include/asm-x86/segment_64.h b/include/asm-x86/segment_64.h
index 04b8ab21328faed255f2cfca4d02f267c9fd5fb3..dce742101348996dc2d994f70eb3cf5613ce1758 100644 (file)
--- 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