[PATCH] x86-64: Extract segment descriptor definitions for use outside

Code that wants to use struct desc_struct cannot do so on i386 because
desc.h contains other code that will only compile on x86_64.

So extract the structure definitions into a asm-x86_64/desc_defs.h.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andi Kleen <ak@suse.de>

 include/asm-x86_64/desc.h      |   53 -------------------------------
 include/asm-x86_64/desc_defs.h |   69 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 52 deletions(-)

2 files changed, 70 insertions, 52 deletions

diff --git a/include/asm-x86_64/desc.h b/include/asm-x86_64/desc.h
index eb7723a46790..913d6ac00033 100644
--- a/include/asm-x86_64/desc.h
+++ b/include/asm-x86_64/desc.h
@@ -9,64 +9,13 @@
 
 #include <linux/string.h>
 #include <linux/smp.h>
+#include <asm/desc_defs.h>
 
 #include <asm/segment.h>
 #include <asm/mmu.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;
-};      
-
 extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
 
-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)) ;
-
 #define load_TR_desc() asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8))
 #define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8))
 #define clear_LDT()  asm volatile("lldt %w0"::"r" (0))
diff --git a/include/asm-x86_64/desc_defs.h b/include/asm-x86_64/desc_defs.h
new file mode 100644
index 000000000000..089004070099
--- /dev/null
+++ b/include/asm-x86_64/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