[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>

1 files changed, 32 insertions, 0 deletions

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 */