1 files changed, 69 insertions, 0 deletions

diff --git a/include/asm-x86/desc_defs.h b/include/asm-x86/desc_defs.h
new file mode 100644
index 000000000000..089004070099
--- /dev/null
+++ b/include/asm-x86/desc_defs.h
@@ -0,0 +1,69 @@
+/* Written 2000 by Andi Kleen */
+#ifndef __ARCH_DESC_DEFS_H
+#define __ARCH_DESC_DEFS_H
+
+/*
+ * Segment descriptor structure definitions, usable from both x86_64 and i386
+ * archs.
+ */
+
+#ifndef __ASSEMBLY__
+
+#include <linux/types.h>
+
+// 8 byte segment descriptor
+struct desc_struct {
+        u16 limit0;
+        u16 base0;
+        unsigned base1 : 8, type : 4, s : 1, dpl : 2, p : 1;
+        unsigned limit : 4, avl : 1, l : 1, d : 1, g : 1, base2 : 8;
+} __attribute__((packed));
+
+struct n_desc_struct {
+        unsigned int a,b;
+};
+
+enum {
+        GATE_INTERRUPT = 0xE,
+        GATE_TRAP = 0xF,
+        GATE_CALL = 0xC,
+};
+
+// 16byte gate
+struct gate_struct {
+        u16 offset_low;
+        u16 segment;
+        unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
+        u16 offset_middle;
+        u32 offset_high;
+        u32 zero1;
+} __attribute__((packed));
+
+#define PTR_LOW(x) ((unsigned long)(x) & 0xFFFF)
+#define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF)
+#define PTR_HIGH(x) ((unsigned long)(x) >> 32)
+
+enum {
+        DESC_TSS = 0x9,
+        DESC_LDT = 0x2,
+};
+
+// LDT or TSS descriptor in the GDT. 16 bytes.
+struct ldttss_desc {
+        u16 limit0;
+        u16 base0;
+        unsigned base1 : 8, type : 5, dpl : 2, p : 1;
+        unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
+        u32 base3;
+        u32 zero1;
+} __attribute__((packed));
+
+struct desc_ptr {
+        unsigned short size;
+        unsigned long address;
+} __attribute__((packed)) ;
+
+
+#endif /* !__ASSEMBLY__ */
+
+#endif