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[MIPS] FPU hazard handling

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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>
This commit is contained in:
Chris Dearman 2007-05-08 16:09:13 +01:00 committed by Ralf Baechle
parent d725cf3818
commit 0b6249567b
2 changed files with 35 additions and 20 deletions
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23
include/asm-mips/fpu.h
View file

@ -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() \

32
include/asm-mips/hazards.h
View file

@ -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 */