1 files changed, 34 insertions, 13 deletions

diff --git a/include/asm-x86/desc_defs.h b/include/asm-x86/desc_defs.h
index 089004070099..e33f078b3e54 100644
--- a/include/asm-x86/desc_defs.h
+++ b/include/asm-x86/desc_defs.h
@@ -11,26 +11,36 @@
 
 #include <linux/types.h>
 
+/*
+ * FIXME: Acessing the desc_struct through its fields is more elegant,
+ * and should be the one valid thing to do. However, a lot of open code
+ * still touches the a and b acessors, and doing this allow us to do it
+ * incrementally. We keep the signature as a struct, rather than an union,
+ * so we can get rid of it transparently in the future -- glommer
+ */
 // 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));
+        union {
+                struct { unsigned int a, b; };
+                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;
+                };
 
-struct n_desc_struct {
-        unsigned int a,b;
-};
+        };
+} __attribute__((packed));
 
 enum {
         GATE_INTERRUPT = 0xE,
         GATE_TRAP = 0xF,
         GATE_CALL = 0xC,
+        GATE_TASK = 0x5,
 };
 
 // 16byte gate
-struct gate_struct {
+struct gate_struct64 {
         u16 offset_low;
         u16 segment;
         unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
@@ -39,17 +49,18 @@ struct gate_struct {
         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)
+#define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF)
+#define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF)
+#define PTR_HIGH(x) ((unsigned long long)(x) >> 32)
 
 enum {
         DESC_TSS = 0x9,
         DESC_LDT = 0x2,
+        DESCTYPE_S =    0x10,   /* !system */
 };
 
 // LDT or TSS descriptor in the GDT. 16 bytes.
-struct ldttss_desc {
+struct ldttss_desc64 {
         u16 limit0;
         u16 base0;
         unsigned base1 : 8, type : 5, dpl : 2, p : 1;
@@ -58,6 +69,16 @@ struct ldttss_desc {
         u32 zero1;
 } __attribute__((packed));
 
+#ifdef CONFIG_X86_64
+typedef struct gate_struct64 gate_desc;
+typedef struct ldttss_desc64 ldt_desc;
+typedef struct ldttss_desc64 tss_desc;
+#else
+typedef struct desc_struct gate_desc;
+typedef struct desc_struct ldt_desc;
+typedef struct desc_struct tss_desc;
+#endif
+
 struct desc_ptr {
         unsigned short size;
         unsigned long address;