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clean and invalidate cache behavior before same address read

loquat

I am running on cortex-A17.

when following,

step1: STR  R0, [R1]       ; [R1] is cacheable

step2: DCCIMVAC          ; clean and invalidate cache

step3: LDR  R0, [R1]       ; memory read

Does step3 access L3(external memory) ?

Or access eviction-buffer in cortex-A17 ?

Or, unknown  behavior?

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  • 0 Arm Employee Badge

    If you had just performed a clean, then it would possible that the core would snoop the eviction buffer.

    As you did a clean+invalidate the core has to re-read the location from the memory system. 

    (Assuming that the address passed to the data cache op is the same VA as in r0)

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  • 0 Arm Employee Badge

    If you had just performed a clean, then it would possible that the core would snoop the eviction buffer.

    As you did a clean+invalidate the core has to re-read the location from the memory system. 

    (Assuming that the address passed to the data cache op is the same VA as in r0)

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