x86: unify common parts of segment.h

Although segment handling in i386 and x86_64 are very different,
there's a common part. Put them in segment.h instead of arch specific
headers

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/asm-x86/segment.h b/include/asm-x86/segment.h
index b3a7a3e9fb19..3c9b306bc4bf 100644
--- a/include/asm-x86/segment.h
+++ b/include/asm-x86/segment.h
@@ -11,4 +11,20 @@
 #define get_kernel_rpl()  0
 #endif
 
+/* 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
+
+/* 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
+
+#define IDT_ENTRIES 256
+#define GDT_SIZE (GDT_ENTRIES * 8)
+#define GDT_ENTRY_TLS_ENTRIES 3
+#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
+
 #endif