Add the Zicfiss extension. #1408
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The type now encodes the type of AMO operation for AMO accesses, and explicitly encodes a CacheAccess variant. This enables more accurate PMA and PMP checks for atomic and cache accesses, and simpler handling of cache accesses when checking permissions during address translation. The abstract `ext_access_type` hook for out-of-tree extensions like CHERI is now an explicit `mem_payload` enum. This enum can be extended for CHERI capability and Zicfiss shadow stack payloads.
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This depends on #1405, so leaving this as a draft until that is merged. It updates #377 by @ved-rivos. |
This adds a `ShadowStack` variant to the memory access type to implement the PTE checks for the shadow stack page. Co-authored-by: Ved Shanbhogue <[email protected]>
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This adds a
ShadowStackvariant to the memory access type to implement the PTE checks for the shadow stack page. The PMA check needs more PMA plumbing to be completed, but is straightforward once that is in place.