Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6

[safe/jmp/linux-2.6] / include / asm-x86 / desc_defs.h

diff --git a/include/asm-x86/desc_defs.h b/include/asm-x86/desc_defs.h
index e33f078..b881db6 100644 (file)
--- a/include/asm-x86/desc_defs.h
+++ b/include/asm-x86/desc_defs.h
@@ -1,6 +1,6 @@
 /* Written 2000 by Andi Kleen */
-#ifndef __ARCH_DESC_DEFS_H
-#define __ARCH_DESC_DEFS_H
+#ifndef ASM_X86__DESC_DEFS_H
+#define ASM_X86__DESC_DEFS_H
 
 /*
  * Segment descriptor structure definitions, usable from both x86_64 and i386
@@ -18,17 +18,19 @@
  * 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
+/* 8 byte segment descriptor */
 struct desc_struct {
        union {
-               struct { unsigned int a, b; };
+               struct {
+                       unsigned int a;
+                       unsigned int 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;
                };
-
        };
 } __attribute__((packed));
 
@@ -39,7 +41,7 @@ enum {
        GATE_TASK = 0x5,
 };
 
-// 16byte gate
+/* 16byte gate */
 struct gate_struct64 {
        u16 offset_low;
        u16 segment;
@@ -56,10 +58,10 @@ struct gate_struct64 {
 enum {
        DESC_TSS = 0x9,
        DESC_LDT = 0x2,
-       DESCTYPE_S =    0x10,   /* !system */
+       DESCTYPE_S = 0x10,      /* !system */
 };
 
-// LDT or TSS descriptor in the GDT. 16 bytes.
+/* LDT or TSS descriptor in the GDT. 16 bytes. */
 struct ldttss_desc64 {
        u16 limit0;
        u16 base0;
@@ -73,10 +75,14 @@ struct ldttss_desc64 {
 typedef struct gate_struct64 gate_desc;
 typedef struct ldttss_desc64 ldt_desc;
 typedef struct ldttss_desc64 tss_desc;
+#define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32))
+#define gate_segment(g) ((g).segment)
 #else
 typedef struct desc_struct gate_desc;
 typedef struct desc_struct ldt_desc;
 typedef struct desc_struct tss_desc;
+#define gate_offset(g)         (((g).b & 0xffff0000) | ((g).a & 0x0000ffff))
+#define gate_segment(g)                ((g).a >> 16)
 #endif
 
 struct desc_ptr {
@@ -84,7 +90,6 @@ struct desc_ptr {
        unsigned long address;
 } __attribute__((packed)) ;
 
-
 #endif /* !__ASSEMBLY__ */
 
-#endif
+#endif /* ASM_X86__DESC_DEFS_H */