1 files changed, 53 insertions, 0 deletions

diff --git a/include/asm-x86/segment_64.h b/include/asm-x86/segment_64.h
new file mode 100644
index 000000000000..04b8ab21328f
--- /dev/null
+++ b/include/asm-x86/segment_64.h
@@ -0,0 +1,53 @@
+#ifndef _ASM_SEGMENT_H
+#define _ASM_SEGMENT_H
+
+#include <asm/cache.h>
+
+/* Simple and small GDT entries for booting only */
+
+#define GDT_ENTRY_BOOT_CS               2
+#define __BOOT_CS       (GDT_ENTRY_BOOT_CS * 8)
+
+#define GDT_ENTRY_BOOT_DS               (GDT_ENTRY_BOOT_CS + 1)
+#define __BOOT_DS       (GDT_ENTRY_BOOT_DS * 8)
+
+#define __KERNEL_CS     0x10
+#define __KERNEL_DS     0x18
+
+#define __KERNEL32_CS   0x08
+
+/* 
+ * we cannot use the same code segment descriptor for user and kernel
+ * -- not even in the long flat mode, because of different DPL /kkeil 
+ * The segment offset needs to contain a RPL. Grr. -AK
+ * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets) 
+ */
+
+#define __USER32_CS   0x23   /* 4*8+3 */ 
+#define __USER_DS     0x2b   /* 5*8+3 */ 
+#define __USER_CS     0x33   /* 6*8+3 */ 
+#define __USER32_DS     __USER_DS 
+
+#define GDT_ENTRY_TSS 8 /* needs two entries */
+#define GDT_ENTRY_LDT 10 /* needs two entries */
+#define GDT_ENTRY_TLS_MIN 12
+#define GDT_ENTRY_TLS_MAX 14
+
+#define GDT_ENTRY_TLS_ENTRIES 3
+
+#define GDT_ENTRY_PER_CPU 15    /* Abused to load per CPU data from limit */
+#define __PER_CPU_SEG   (GDT_ENTRY_PER_CPU * 8 + 3)
+
+/* TLS indexes for 64bit - hardcoded in arch_prctl */
+#define FS_TLS 0        
+#define GS_TLS 1        
+
+#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
+#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
+
+#define IDT_ENTRIES 256
+#define GDT_ENTRIES 16
+#define GDT_SIZE (GDT_ENTRIES * 8)
+#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) 
+
+#endif