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Fix PMP locking #363

Merged
merged 4 commits into from
Jul 11, 2022
Merged

Fix PMP locking #363

merged 4 commits into from
Jul 11, 2022

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stnolting
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Triggered by riscv/riscv-isa-manual#866 this PR fixes the locking behavior of the physical memory protection (PMP) CPU extension:

If PMP entry i is locked, writes to pmpcfg(i) and pmpaddr(i) are ignored. Additionally, if PMP entry i is locked and pmpcfg(i).A is set to TOR, writes to pmpaddr(i-1) are ignored (added by this PR).

@stnolting stnolting added risc-v compliance Modification to comply with official RISC-V specs. HW Hardware-related labels Jul 11, 2022
@stnolting stnolting self-assigned this Jul 11, 2022
@stnolting stnolting marked this pull request as ready for review July 11, 2022 11:01
@stnolting stnolting merged commit 50f1cbc into main Jul 11, 2022
@stnolting stnolting deleted the pmp_locking branch July 11, 2022 18:32
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HW Hardware-related risc-v compliance Modification to comply with official RISC-V specs.
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