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Date: Thu, 20 Dec 2007 03:59:43 -0800 (PST)
From: Roland McGrath <roland@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH -mm 27/43] x86 i387 unify structs
The i387_fxsave_struct formats really have the same layout
on 32 and 64, with only some slightly different use of a few
fields. The i387_fsave_struct and i387_soft_struct formats
are never used by 64-bit kernels, but it doesn't hurt to
have the unused types in the union and cuts down on the
amount of #ifdef hair required throughout the i387 code.
Signed-off-by: Roland McGrath <roland@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
include/asm-x86/processor.h | 92 +++++++++++++++++++-----------------------
1 files changed, 42 insertions(+), 50 deletions(-)
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h
index 80c5002..ea222cf 100644
--- a/include/asm-x86/processor.h
+++ b/include/asm-x86/processor.h
@@ -226,64 +226,37 @@ struct orig_ist {
unsigned long ist[7];
};
-#ifdef CONFIG_X86_32
-struct i387_fsave_struct {
- long cwd;
- long swd;
- long twd;
- long fip;
- long fcs;
- long foo;
- long fos;
- long st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */
- long status; /* software status information */
-};
-
-struct i387_fxsave_struct {
- unsigned short cwd;
- unsigned short swd;
- unsigned short twd;
- unsigned short fop;
- long fip;
- long fcs;
- long foo;
- long fos;
- long mxcsr;
- long mxcsr_mask;
- long st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
- long xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
- long padding[56];
-} __attribute__((aligned(16)));
+#define MXCSR_DEFAULT 0x1f80
-struct i387_soft_struct {
- long cwd;
- long swd;
- long twd;
- long fip;
- long fcs;
- long foo;
- long fos;
- long st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */
- unsigned char ftop, changed, lookahead, no_update, rm, alimit;
- struct info *info;
- unsigned long entry_eip;
-};
-
-union i387_union {
- struct i387_fsave_struct fsave;
- struct i387_fxsave_struct fxsave;
- struct i387_soft_struct soft;
+struct i387_fsave_struct {
+ u32 cwd;
+ u32 swd;
+ u32 twd;
+ u32 fip;
+ u32 fcs;
+ u32 foo;
+ u32 fos;
+ u32 st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */
+ u32 status; /* software status information */
};
-# include "processor_32.h"
-#else
struct i387_fxsave_struct {
u16 cwd;
u16 swd;
u16 twd;
u16 fop;
- u64 rip;
- u64 rdp;
+ union {
+ struct {
+ u64 rip;
+ u64 rdp;
+ };
+ struct {
+ u32 fip;
+ u32 fcs;
+ u32 foo;
+ u32 fos;
+ };
+ };
u32 mxcsr;
u32 mxcsr_mask;
u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
@@ -291,10 +264,29 @@ struct i387_fxsave_struct {
u32 padding[24];
} __attribute__((aligned(16)));
+struct i387_soft_struct {
+ u32 cwd;
+ u32 swd;
+ u32 twd;
+ u32 fip;
+ u32 fcs;
+ u32 foo;
+ u32 fos;
+ u32 st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */
+ u8 ftop, changed, lookahead, no_update, rm, alimit;
+ struct info *info;
+ u32 entry_eip;
+};
+
union i387_union {
+ struct i387_fsave_struct fsave;
struct i387_fxsave_struct fxsave;
+ struct i387_soft_struct soft;
};
+#ifdef CONFIG_X86_32
+# include "processor_32.h"
+#else
# include "processor_64.h"
#endif
--
1.5.3.6
--
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