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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>
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@ -31,9 +31,15 @@
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#define __mtc0_tlbw_hazard \
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___ehb
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#define __mtc0_tlbr_hazard \
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___ehb
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#define __tlbw_use_hazard \
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___ehb
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#define __tlb_read_hazard \
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___ehb
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#define __tlb_probe_hazard \
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___ehb
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@ -80,12 +86,23 @@ do { \
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___ssnop; \
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___ehb
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#define __mtc0_tlbr_hazard \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __tlbw_use_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __tlb_read_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __tlb_probe_hazard \
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___ssnop; \
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___ssnop; \
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@ -147,8 +164,12 @@ do { \
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#define __mtc0_tlbw_hazard
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#define __mtc0_tlbr_hazard
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#define __tlbw_use_hazard
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#define __tlb_read_hazard
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#define __tlb_probe_hazard
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#define __irq_enable_hazard
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@ -166,8 +187,12 @@ do { \
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*/
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#define __mtc0_tlbw_hazard
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#define __mtc0_tlbr_hazard
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#define __tlbw_use_hazard
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#define __tlb_read_hazard
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#define __tlb_probe_hazard
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#define __irq_enable_hazard
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@ -196,11 +221,20 @@ do { \
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nop; \
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nop
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#define __mtc0_tlbr_hazard \
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nop; \
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nop
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#define __tlbw_use_hazard \
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nop; \
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nop; \
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nop
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#define __tlb_read_hazard \
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nop; \
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nop; \
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nop
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#define __tlb_probe_hazard \
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nop; \
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nop; \
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@ -267,7 +301,9 @@ do { \
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#define _ssnop ___ssnop
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#define _ehb ___ehb
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#define mtc0_tlbw_hazard __mtc0_tlbw_hazard
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#define mtc0_tlbr_hazard __mtc0_tlbr_hazard
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#define tlbw_use_hazard __tlbw_use_hazard
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#define tlb_read_hazard __tlb_read_hazard
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#define tlb_probe_hazard __tlb_probe_hazard
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#define irq_enable_hazard __irq_enable_hazard
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#define irq_disable_hazard __irq_disable_hazard
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@ -300,6 +336,14 @@ do { \
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} while (0)
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#define mtc0_tlbr_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__mtc0_tlbr_hazard) \
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); \
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} while (0)
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#define tlbw_use_hazard() \
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do { \
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__asm__ __volatile__( \
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@ -308,6 +352,14 @@ do { \
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} while (0)
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#define tlb_read_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__tlb_read_hazard) \
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); \
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} while (0)
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#define tlb_probe_hazard() \
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do { \
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__asm__ __volatile__( \
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