Use ei / di MIPS32 R2 instructions if available.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/asm-mips/interrupt.h

@@ -11,20 +11,25 @@
 #ifndef _ASM_INTERRUPT_H
 #define _ASM_INTERRUPT_H
 
+#include <linux/config.h>
 #include <asm/hazards.h>
 
 __asm__ (
-	".macro\tlocal_irq_enable\n\t"
-	".set\tpush\n\t"
-	".set\treorder\n\t"
-	".set\tnoat\n\t"
-	"mfc0\t$1,$12\n\t"
-	"ori\t$1,0x1f\n\t"
-	"xori\t$1,0x1e\n\t"
-	"mtc0\t$1,$12\n\t"
-	"irq_enable_hazard\n\t"
-	".set\tpop\n\t"
-	".endm");
+	"	.macro	local_irq_enable				\n"
+	"	.set	push						\n"
+	"	.set	reorder						\n"
+	"	.set	noat						\n"
+#if defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS64_R2)
+	"	ei							\n"
+#else
+	"	mfc0	$1,$12						\n"
+	"	ori	$1,0x1f						\n"
+	"	xori	$1,0x1e						\n"
+	"	mtc0	$1,$12						\n"
+#endif
+	"	irq_enable_hazard					\n"
+	"	.set	pop						\n"
+	"	.endm");
 
 static inline void local_irq_enable(void)
 {
@@ -43,17 +48,21 @@ static inline void local_irq_enable(void)
  * no nops at all.
  */
 __asm__ (
-	".macro\tlocal_irq_disable\n\t"
-	".set\tpush\n\t"
-	".set\tnoat\n\t"
-	"mfc0\t$1,$12\n\t"
-	"ori\t$1,1\n\t"
-	"xori\t$1,1\n\t"
-	".set\tnoreorder\n\t"
-	"mtc0\t$1,$12\n\t"
-	"irq_disable_hazard\n\t"
-	".set\tpop\n\t"
-	".endm");
+	"	.macro	local_irq_disable\n"
+	"	.set	push						\n"
+	"	.set	noat						\n"
+#if defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS64_R2)
+	"	di							\n"
+#else
+	"	mfc0	$1,$12						\n"
+	"	ori	$1,1						\n"
+	"	xori	$1,1						\n"
+	"	.set	noreorder					\n"
+	"	mtc0	$1,$12						\n"
+#endif
+	"	irq_disable_hazard					\n"
+	"	.set	pop						\n"
+	"	.endm							\n");
 
 static inline void local_irq_disable(void)
 {
@@ -65,12 +74,12 @@ static inline void local_irq_disable(void)
 }
 
 __asm__ (
-	".macro\tlocal_save_flags flags\n\t"
-	".set\tpush\n\t"
-	".set\treorder\n\t"
-	"mfc0\t\\flags, $12\n\t"
-	".set\tpop\n\t"
-	".endm");
+	"	.macro	local_save_flags flags				\n"
+	"	.set	push						\n"
+	"	.set	reorder						\n"
+	"	mfc0	\\flags, $12					\n"
+	"	.set	pop						\n"
+	"	.endm							\n");
 
 #define local_save_flags(x)						\
 __asm__ __volatile__(							\
@@ -78,18 +87,22 @@ __asm__ __volatile__(							\
 	: "=r" (x))
 
 __asm__ (
-	".macro\tlocal_irq_save result\n\t"
-	".set\tpush\n\t"
-	".set\treorder\n\t"
-	".set\tnoat\n\t"
-	"mfc0\t\\result, $12\n\t"
-	"ori\t$1, \\result, 1\n\t"
-	"xori\t$1, 1\n\t"
-	".set\tnoreorder\n\t"
-	"mtc0\t$1, $12\n\t"
-	"irq_disable_hazard\n\t"
-	".set\tpop\n\t"
-	".endm");
+	"	.macro	local_irq_save result				\n"
+	"	.set	push						\n"
+	"	.set	reorder						\n"
+	"	.set	noat						\n"
+#if defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS64_R2)
+	"	di	\\result					\n"
+#else
+	"	mfc0	\\result, $12					\n"
+	"	ori	$1, \\result, 1					\n"
+	"	xori	$1, 1						\n"
+	"	.set	noreorder					\n"
+	"	mtc0	$1, $12						\n"
+#endif
+	"	irq_disable_hazard					\n"
+	"	.set	pop						\n"
+	"	.endm							\n");
 
 #define local_irq_save(x)						\
 __asm__ __volatile__(							\
@@ -99,19 +112,38 @@ __asm__ __volatile__(							\
 	: "memory")
 
 __asm__ (
-	".macro\tlocal_irq_restore flags\n\t"
-	".set\tnoreorder\n\t"
-	".set\tnoat\n\t"
-	"mfc0\t$1, $12\n\t"
-	"andi\t\\flags, 1\n\t"
-	"ori\t$1, 1\n\t"
-	"xori\t$1, 1\n\t"
-	"or\t\\flags, $1\n\t"
-	"mtc0\t\\flags, $12\n\t"
-	"irq_disable_hazard\n\t"
-	".set\tat\n\t"
-	".set\treorder\n\t"
-	".endm");
+	"	.macro	local_irq_restore flags				\n"
+	"	.set	noreorder					\n"
+	"	.set	noat						\n"
+#if (defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS64_R2)) && \
+    defined(CONFIG_IRQ_CPU)
+	/*
+	 * Slow, but doesn't suffer from a relativly unlikely race
+	 * condition we're having since days 1.
+	 */
+	"	beqz	\\flags, 1f					\n"
+	"	 di							\n"
+	"	ei							\n"
+	"1:								\n"
+#elif defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS64_R2)
+	/*
+	 * Fast, dangerous.  Life is fun, life is good.
+	 */
+	"	mfc0	$1, $12						\n"
+	"	ins	$1, \\flags, 0, 1				\n"
+	"	mtc0	$1, $12						\n"
+#else
+	"	mfc0	$1, $12						\n"
+	"	andi	\\flags, 1					\n"
+	"	ori	$1, 1						\n"
+	"	xori	$1, 1						\n"
+	"	or	\\flags, $1					\n"
+	"	mtc0	\\flags, $12					\n"
+#endif
+	"	irq_disable_hazard					\n"
+	"	.set	at						\n"
+	"	.set	reorder						\n"
+	"	.endm							\n");
 
 #define local_irq_restore(flags)					\
 do {									\