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authorChris Dearman <chris@mips.com>2007-05-08 19:09:13 +0400
committerRalf Baechle <ralf@linux-mips.org>2007-05-11 17:28:31 +0400
commit0b6249567b4ecf6e9d5a8efcf149f3e7cf788cc0 (patch)
treedfb8d45357a9e8e3ad134f7eec87e7918132410e
parentd725cf3818b12a17d78b87a2de19e8eec17126ae (diff)
downloadlinux-0b6249567b4ecf6e9d5a8efcf149f3e7cf788cc0.tar.xz
[MIPS] FPU hazard handling
Move FPU hazard handling to hazards.h and provide proper support for MIPSR2 processors Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--include/asm-mips/fpu.h23
-rw-r--r--include/asm-mips/hazards.h32
2 files changed, 35 insertions, 20 deletions
diff --git a/include/asm-mips/fpu.h b/include/asm-mips/fpu.h
index b414a7d9db43..483685b1592e 100644
--- a/include/asm-mips/fpu.h
+++ b/include/asm-mips/fpu.h
@@ -16,6 +16,7 @@
#include <asm/mipsregs.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>
+#include <asm/hazards.h>
#include <asm/bitops.h>
#include <asm/processor.h>
#include <asm/current.h>
@@ -38,34 +39,16 @@ extern void _init_fpu(void);
extern void _save_fp(struct task_struct *);
extern void _restore_fp(struct task_struct *);
-#if defined(CONFIG_CPU_SB1)
-#define __enable_fpu_hazard() \
-do { \
- asm(".set push \n\t" \
- ".set mips64 \n\t" \
- ".set noreorder \n\t" \
- "ssnop \n\t" \
- "bnezl $0, .+4 \n\t" \
- "ssnop \n\t" \
- ".set pop"); \
-} while (0)
-#else
-#define __enable_fpu_hazard() \
-do { \
- asm("nop;nop;nop;nop"); /* max. hazard */ \
-} while (0)
-#endif
-
#define __enable_fpu() \
do { \
set_c0_status(ST0_CU1); \
- __enable_fpu_hazard(); \
+ enable_fpu_hazard(); \
} while (0)
#define __disable_fpu() \
do { \
clear_c0_status(ST0_CU1); \
- /* We don't care about the c0 hazard here */ \
+ disable_fpu_hazard(); \
} while (0)
#define enable_fpu() \
diff --git a/include/asm-mips/hazards.h b/include/asm-mips/hazards.h
index e50c77e69cb5..1542f23ab9d9 100644
--- a/include/asm-mips/hazards.h
+++ b/include/asm-mips/hazards.h
@@ -178,4 +178,36 @@ ASMMACRO(back_to_back_c0_hazard,
#endif
+
+/* FPU hazards */
+
+#if defined(CONFIG_CPU_SB1)
+ASMMACRO(enable_fpu_hazard,
+ .set push;
+ .set mips64;
+ .set noreorder;
+ _ssnop;
+ bnezl $0,.+4;
+ _ssnop
+ .set pop
+)
+ASMMACRO(disable_fpu_hazard,
+)
+
+#elif defined(CONFIG_CPU_MIPSR2)
+ASMMACRO(enable_fpu_hazard,
+ _ehb
+)
+ASMMACRO(disable_fpu_hazard,
+ _ehb
+)
+#else
+ASMMACRO(enable_fpu_hazard,
+ nop; nop; nop; nop
+)
+ASMMACRO(disable_fpu_hazard,
+ _ehb
+)
+#endif
+
#endif /* _ASM_HAZARDS_H */