[Xen-devel] [PATCH 08 of 36] x86_64: Add gate_offset() and gate_segment() macros

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

For calculating the offset from struct gate_struct fields.

[ gate_offset and gate_segment were broken for 32-bit. ]

Signed-off-by: Eduardo Habkost <ehabkost@xxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 include/asm-x86/desc_defs.h |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/asm-x86/desc_defs.h b/include/asm-x86/desc_defs.h
--- a/include/asm-x86/desc_defs.h
+++ b/include/asm-x86/desc_defs.h
@@ -75,10 +75,14 @@
 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 {



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