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authorJames Hogan <james.hogan@imgtec.com>2015-05-19 11:50:30 +0300
committerRalf Baechle <ralf@linux-mips.org>2015-06-21 22:52:28 +0300
commite50f0e313548854c2709a5ba9c61623cf189a9a1 (patch)
tree4351ce6fbf13928eedbe28a623b70adce826c827 /arch/mips/include/asm/hazards.h
parentd1e9a4f547354ca258b6200ab6b1f0e4909b92e8 (diff)
downloadlinux-e50f0e313548854c2709a5ba9c61623cf189a9a1.tar.xz
MIPS: hazards: Add hazard macros for tlb read
Add hazard macros to <asm/hazards.h> for the following hazards around tlbr (TLB read) instructions, which are used in TLB dumping code and some KVM TLB management code: - mtc0_tlbr_hazard Between mtc0 (Index) and tlbr. This is copied from mtc0_tlbw_hazard in all cases on the assumption that tlbr always has similar data user timings to tlbw. - tlb_read_hazard Between tlbr and mfc0 (various TLB registers). This is copied from tlbw_use_hazard in all cases on the assumption that tlbr has similar data writer characteristics to tlbw, and mfc0 has similar data user characteristics to loads and stores. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/10078/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/hazards.h')
-rw-r--r--arch/mips/include/asm/hazards.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/mips/include/asm/hazards.h b/arch/mips/include/asm/hazards.h
index 4087b47ad1cb..7b99efd31074 100644
--- a/arch/mips/include/asm/hazards.h
+++ b/arch/mips/include/asm/hazards.h
@@ -31,9 +31,15 @@
#define __mtc0_tlbw_hazard \
___ehb
+#define __mtc0_tlbr_hazard \
+ ___ehb
+
#define __tlbw_use_hazard \
___ehb
+#define __tlb_read_hazard \
+ ___ehb
+
#define __tlb_probe_hazard \
___ehb
@@ -80,12 +86,23 @@ do { \
___ssnop; \
___ehb
+#define __mtc0_tlbr_hazard \
+ ___ssnop; \
+ ___ssnop; \
+ ___ehb
+
#define __tlbw_use_hazard \
___ssnop; \
___ssnop; \
___ssnop; \
___ehb
+#define __tlb_read_hazard \
+ ___ssnop; \
+ ___ssnop; \
+ ___ssnop; \
+ ___ehb
+
#define __tlb_probe_hazard \
___ssnop; \
___ssnop; \
@@ -147,8 +164,12 @@ do { \
#define __mtc0_tlbw_hazard
+#define __mtc0_tlbr_hazard
+
#define __tlbw_use_hazard
+#define __tlb_read_hazard
+
#define __tlb_probe_hazard
#define __irq_enable_hazard
@@ -166,8 +187,12 @@ do { \
*/
#define __mtc0_tlbw_hazard
+#define __mtc0_tlbr_hazard
+
#define __tlbw_use_hazard
+#define __tlb_read_hazard
+
#define __tlb_probe_hazard
#define __irq_enable_hazard
@@ -196,11 +221,20 @@ do { \
nop; \
nop
+#define __mtc0_tlbr_hazard \
+ nop; \
+ nop
+
#define __tlbw_use_hazard \
nop; \
nop; \
nop
+#define __tlb_read_hazard \
+ nop; \
+ nop; \
+ nop
+
#define __tlb_probe_hazard \
nop; \
nop; \
@@ -267,7 +301,9 @@ do { \
#define _ssnop ___ssnop
#define _ehb ___ehb
#define mtc0_tlbw_hazard __mtc0_tlbw_hazard
+#define mtc0_tlbr_hazard __mtc0_tlbr_hazard
#define tlbw_use_hazard __tlbw_use_hazard
+#define tlb_read_hazard __tlb_read_hazard
#define tlb_probe_hazard __tlb_probe_hazard
#define irq_enable_hazard __irq_enable_hazard
#define irq_disable_hazard __irq_disable_hazard
@@ -300,6 +336,14 @@ do { \
} while (0)
+#define mtc0_tlbr_hazard() \
+do { \
+ __asm__ __volatile__( \
+ __stringify(__mtc0_tlbr_hazard) \
+ ); \
+} while (0)
+
+
#define tlbw_use_hazard() \
do { \
__asm__ __volatile__( \
@@ -308,6 +352,14 @@ do { \
} while (0)
+#define tlb_read_hazard() \
+do { \
+ __asm__ __volatile__( \
+ __stringify(__tlb_read_hazard) \
+ ); \
+} while (0)
+
+
#define tlb_probe_hazard() \
do { \
__asm__ __volatile__( \