ARM v7: added v7_mmu_cache_invalidate()
At least the iMX6 boot rom seems to jump into barebox with a non invalidated d-cache which causes data corruption when v7_mmu_cache_flush() executed by arm_early_mmu_cache_flush() overrides stack or other valid data. That's why the cache must be invalided for this processors explicitly (e.g. in barebox_arm_reset_vector()). Operation differs from flush only in one instruction so that patch modifies the existing v7_mmu_cache_flush() function slightly by adding an optional argument. Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -56,8 +56,18 @@ ENTRY(v7_mmu_cache_off)
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ldmfd sp!, {r4-r12, pc}
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ENDPROC(v7_mmu_cache_off)
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.section .text.v7_mmu_cache_flush
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.section .text.v7_mmu_cache_flush_invalidate
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ENTRY(v7_mmu_cache_invalidate)
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mov r0, #1
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b __v7_mmu_cache_flush_invalidate
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ENDPROC(v7_mmu_cache_invalidate)
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ENTRY(v7_mmu_cache_flush)
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mov r0, #0
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b __v7_mmu_cache_flush_invalidate
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ENDPROC(v7_mmu_cache_flush)
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ENTRY(__v7_mmu_cache_flush_invalidate)
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mrc p15, 0, r12, c0, c1, 5 @ read ID_MMFR1
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tst r12, #0xf << 16 @ hierarchical cache (ARMv7)
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mov r12, #0
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@ -65,7 +75,8 @@ ENTRY(v7_mmu_cache_flush)
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mcr p15, 0, r12, c7, c14, 0 @ clean+invalidate D
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b iflush
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hierarchical:
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stmfd sp!, {r4-r7, r9-r11}
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stmfd sp!, {r4-r11}
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mov r8, r0
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mcr p15, 0, r12, c7, c10, 5 @ DMB
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mrc p15, 1, r0, c0, c0, 1 @ read clidr
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ands r3, r0, #0x7000000 @ extract loc from clidr
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@ -97,7 +108,10 @@ THUMB( lsl r6, r9, r5 )
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THUMB( orr r11, r12, r6 ) @ factor way and cache number into r11
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THUMB( lsl r6, r7, r2 )
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THUMB( orr r11, r11, r6 ) @ factor index number into r11
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mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
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cmp r8, #0
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THUMB( ite eq )
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mcreq p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
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mcrne p15, 0, r11, c7, c6, 2 @ invalidate by set/way
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subs r9, r9, #1 @ decrement the way
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bge loop3
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subs r7, r7, #1 @ decrement the index
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@ -107,7 +121,7 @@ skip:
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cmp r3, r12
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bgt loop1
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finished:
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ldmfd sp!, {r4-r7, r9-r11}
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ldmfd sp!, {r4-r11}
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mov r12, #0 @ switch back to cache level 0
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mcr p15, 2, r12, c0, c0, 0 @ select current cache level in cssr
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iflush:
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@ -116,7 +130,7 @@ iflush:
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mcr p15, 0, r12, c7, c10, 4 @ DSB
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mcr p15, 0, r12, c7, c5, 4 @ ISB
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mov pc, lr
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ENDPROC(v7_mmu_cache_flush)
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ENDPROC(__v7_mmu_cache_flush_invalidate)
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/*
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* cache_line_size - get the cache line size from the CSIDR register
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