[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>

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 */