[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>

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 */