From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Wed, 25 Jun 2008 04:19:04 +0000 (-0400)
Subject: x86, 64-bit: add gate_offset() and gate_segment() macros
X-Git-Tag: v2.6.27-rc1~1106^2~179
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=43adfc26dea171558f944adbc9adecddf2d4602f;p=~emulex%2Finfiniband.git

x86, 64-bit: add gate_offset() and gate_segment() macros

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@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/include/asm-x86/desc_defs.h b/include/asm-x86/desc_defs.h
index eccb4ea1f91..f7bacf357da 100644
--- a/include/asm-x86/desc_defs.h
+++ b/include/asm-x86/desc_defs.h
@@ -75,10 +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 {