X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-mips%2Finterrupt.h;h=a99d6867510fde017b85e00ddee65d79ae5762e5;hb=e85d0918b54fbd9b38003752f7d665416b06edd8;hp=abdf54ee64cf306d35b0dd32702c5fed061d4f58;hpb=292dd876ee765c478b27c93cc51e93a558ed58bf;p=linux-2.6

diff --git a/include/asm-mips/interrupt.h b/include/asm-mips/interrupt.h
index abdf54ee64..a99d686751 100644
--- a/include/asm-mips/interrupt.h
+++ b/include/asm-mips/interrupt.h
@@ -11,7 +11,6 @@
 #ifndef _ASM_INTERRUPT_H
 #define _ASM_INTERRUPT_H
 
-#include <linux/config.h>
 #include <asm/hazards.h>
 
 __asm__ (
@@ -19,7 +18,12 @@ __asm__ (
 	"	.set	push						\n"
 	"	.set	reorder						\n"
 	"	.set	noat						\n"
-#ifdef CONFIG_CPU_MIPSR2
+#ifdef CONFIG_MIPS_MT_SMTC
+	"	mfc0	$1, $2, 1	# SMTC - clear TCStatus.IXMT	\n"
+	"	ori	$1, 0x400					\n"
+	"	xori	$1, 0x400					\n"
+	"	mtc0	$1, $2, 1					\n"
+#elif defined(CONFIG_CPU_MIPSR2)
 	"	ei							\n"
 #else
 	"	mfc0	$1,$12						\n"
@@ -47,16 +51,32 @@ static inline void local_irq_enable(void)
  * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
  * no nops at all.
  */
+/*
+ * For TX49, operating only IE bit is not enough.
+ *
+ * If mfc0 $12 follows store and the mfc0 is last instruction of a
+ * page and fetching the next instruction causes TLB miss, the result
+ * of the mfc0 might wrongly contain EXL bit.
+ *
+ * ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008
+ *
+ * Workaround: mask EXL bit of the result or place a nop before mfc0.
+ */
 __asm__ (
 	"	.macro	local_irq_disable\n"
 	"	.set	push						\n"
 	"	.set	noat						\n"
-#ifdef CONFIG_CPU_MIPSR2
+#ifdef CONFIG_MIPS_MT_SMTC
+	"	mfc0	$1, $2, 1					\n"
+	"	ori	$1, 0x400					\n"
+	"	.set	noreorder					\n"
+	"	mtc0	$1, $2, 1					\n"
+#elif defined(CONFIG_CPU_MIPSR2)
 	"	di							\n"
 #else
 	"	mfc0	$1,$12						\n"
-	"	ori	$1,1						\n"
-	"	xori	$1,1						\n"
+	"	ori	$1,0x1f						\n"
+	"	xori	$1,0x1f						\n"
 	"	.set	noreorder					\n"
 	"	mtc0	$1,$12						\n"
 #endif
@@ -77,7 +97,11 @@ __asm__ (
 	"	.macro	local_save_flags flags				\n"
 	"	.set	push						\n"
 	"	.set	reorder						\n"
+#ifdef CONFIG_MIPS_MT_SMTC
+	"	mfc0	\\flags, $2, 1					\n"
+#else
 	"	mfc0	\\flags, $12					\n"
+#endif
 	"	.set	pop						\n"
 	"	.endm							\n");
 
@@ -91,13 +115,19 @@ __asm__ (
 	"	.set	push						\n"
 	"	.set	reorder						\n"
 	"	.set	noat						\n"
-#ifdef CONFIG_CPU_MIPSR2
+#ifdef CONFIG_MIPS_MT_SMTC
+	"	mfc0	\\result, $2, 1					\n"
+	"	ori	$1, \\result, 0x400				\n"
+	"	.set	noreorder					\n"
+	"	mtc0	$1, $2, 1					\n"
+	"	andi	\\result, \\result, 0x400			\n"
+#elif defined(CONFIG_CPU_MIPSR2)
 	"	di	\\result					\n"
 	"	andi	\\result, 1					\n"
 #else
 	"	mfc0	\\result, $12					\n"
-	"	ori	$1, \\result, 1					\n"
-	"	xori	$1, 1						\n"
+	"	ori	$1, \\result, 0x1f				\n"
+	"	xori	$1, 0x1f					\n"
 	"	.set	noreorder					\n"
 	"	mtc0	$1, $12						\n"
 #endif
@@ -114,9 +144,17 @@ __asm__ __volatile__(							\
 
 __asm__ (
 	"	.macro	local_irq_restore flags				\n"
+	"	.set	push						\n"
 	"	.set	noreorder					\n"
 	"	.set	noat						\n"
-#if defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
+#ifdef CONFIG_MIPS_MT_SMTC
+	"mfc0	$1, $2, 1						\n"
+	"andi	\\flags, 0x400						\n"
+	"ori	$1, 0x400						\n"
+	"xori	$1, 0x400						\n"
+	"or	\\flags, $1						\n"
+	"mtc0	\\flags, $2, 1						\n"
+#elif defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
 	/*
 	 * Slow, but doesn't suffer from a relativly unlikely race
 	 * condition we're having since days 1.
@@ -135,14 +173,13 @@ __asm__ (
 #else
 	"	mfc0	$1, $12						\n"
 	"	andi	\\flags, 1					\n"
-	"	ori	$1, 1						\n"
-	"	xori	$1, 1						\n"
+	"	ori	$1, 0x1f					\n"
+	"	xori	$1, 0x1f					\n"
 	"	or	\\flags, $1					\n"
 	"	mtc0	\\flags, $12					\n"
 #endif
 	"	irq_disable_hazard					\n"
-	"	.set	at						\n"
-	"	.set	reorder						\n"
+	"	.set	pop						\n"
 	"	.endm							\n");
 
 #define local_irq_restore(flags)					\
@@ -156,11 +193,29 @@ do {									\
 		: "memory");						\
 } while(0)
 
-#define irqs_disabled()							\
-({									\
-	unsigned long flags;						\
-	local_save_flags(flags);					\
-	!(flags & 1);							\
-})
+static inline int irqs_disabled(void)
+{
+#ifdef CONFIG_MIPS_MT_SMTC
+	/*
+	 * SMTC model uses TCStatus.IXMT to disable interrupts for a thread/CPU
+	 */
+	unsigned long __result;
+
+	__asm__ __volatile__(
+	"	.set	noreorder					\n"
+	"	mfc0	%0, $2, 1					\n"
+	"	andi	%0, 0x400					\n"
+	"	slt	%0, $0, %0					\n"
+	"	.set	reorder						\n"
+	: "=r" (__result));
+
+	return __result;
+#else
+	unsigned long flags;
+	local_save_flags(flags);
+
+	return !(flags & 1);
+#endif
+}
 
 #endif /* _ASM_INTERRUPT_H */