Read-if-hit-pre-PoPA request

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United States of America Patent

PATENT NO 11526443
SERIAL NO

17445146

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Requester circuitry 4 issues an access request specifying a target physical address (PA) and a target physical address space (PAS) identifier identifying a target PAS. Prior to a point of physical aliasing (PoPA), a pre-PoPA memory system component 24, 8 treats aliasing PAs from different PASs which actually correspond to the same memory system resource as if they correspond to different memory system resources. A post-PoPA memory system component 6 treats the aliasing PAs as referring to the same memory system resource. When the target PA and target PAS of a read-if-hit-pre-PoPA request hit in a pre-PoPA cache 24, a data response is returned to the requester circuitry 4. If the read-if-hit-pre-PoPA request misses in the pre-PoPA cache 24, a no-data response is returned. The read-if-hit-pre-PoPA request is safe to issue speculatively while waiting for security checks to be performed, improving performance.

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Patent Owner(s)

  • ARM LIMITED

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hornung, Alexander Alfred Cambridge, GB 12 32
Swaine, Andrew Brookfield Sheffield, GB 58 650

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