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riscv: Port improvements from arm64/amd64 pmaps, part 1
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Authored by markj on Oct 19 2023, 1:07 PM.
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rG8c88d17fa5c4: riscv: Port improvements from arm64/amd64 pmaps, part 1
rG7703ac2e983b: riscv: Port improvements from arm64/amd64 pmaps, part 1
Summary
  • When promoting, do not require that all PTEs all have PTE_A set. Instead, record whether they did and store this information in the PTP's valid bits.
  • Synchronize some comments in pmap_promote_l2().
  • Make pmap_promote_l2() scan starting from the end of the 2MB range instead of the beginning. See the commit log for 9d1b7fa31f510 for justification of this, which I believe applies here as well.

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riscv/
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sys/riscv/include/pte.h

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sys/riscv/riscv/pmap.c

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