linux-kernel - [PATCH 04/12] x86: Add macros for gate

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Message-Id: <a9cabc5cabdb5a10631e2a6dc330c54826f2b210.1224903712.git.ice799@gmail.com>
Date:	Fri, 24 Oct 2008 20:15:24 -0700
From:	Joe Damato <ice799@...il.com>
To:	linux-x86_64@...r.kernel.org, linux-newbie@...r.kernel.org,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Joe Damato <ice799@...il.com>
Subject: [PATCH 04/12] x86: Add macros for gate_desc

Add useful macros which can be used to access the lo and hi 32bit words, get the offset of the handler, and get the segment for gate_descs.

Signed-off-by: Joe Damato <ice799@...il.com>
---
 include/asm-x86/desc_defs.h |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/asm-x86/desc_defs.h b/include/asm-x86/desc_defs.h
index 012df1f..d6a5310 100644
--- a/include/asm-x86/desc_defs.h
+++ b/include/asm-x86/desc_defs.h
@@ -75,8 +75,13 @@ typedef struct ldttss_desc64 tss_desc;
 typedef struct gate_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)
+#define desc_lo(d)		(((u32 *)&d)[0])
+#define desc_hi(d)		(((u32 *)&d)[1])
+#define gate_offset(g)		(((g).base1 << 16) | ((g).base0 & 0x0000ffff))
+#define gate_segment(g)		((g).seg_sel >> 16)
+#define ldttss_offset(d)	(((d).base2 << 24 ) | ((d).base1 << 16) |\
+				 ((d).base0 & 0x0000ffff))
+#define ldttss_limit(d)		((d).limit0)
 #endif
 
 struct desc_ptr {
-- 
1.5.4.3

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