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[herd,asl] Implement basic ASL+VMSA #916

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[herd,asl] Implement basic ASL+VMSA #916

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@maranget maranget commented Jul 29, 2024

Basic ASL+VMSA, tested on simple loads and stores. The current implementation handle successful accesses and three errors: invalid page table entries, writing on a non-writable page, hardware management of access flag and dirty bit.

@maranget maranget force-pushed the asl-vmsa branch 2 times, most recently from c2a7a9c to 2eac84d Compare July 30, 2024 13:18
@maranget maranget force-pushed the asl-vmsa branch 3 times, most recently from 0ef2aed to 4766eb2 Compare August 15, 2024 09:37
@maranget maranget force-pushed the asl-vmsa branch 5 times, most recently from e8d2c81 to 4c177b0 Compare September 6, 2024 13:09
@maranget maranget force-pushed the asl-vmsa branch 3 times, most recently from 4aa5739 to 4c688f6 Compare September 18, 2024 12:08
@maranget maranget force-pushed the asl-vmsa branch 4 times, most recently from 010b377 to a093e2d Compare October 14, 2024 13:57
@maranget maranget force-pushed the asl-vmsa branch 4 times, most recently from e5ec2b1 to f1dabe3 Compare October 16, 2024 10:13
Notice that page table are accessed in PTE2 mode. That is,
PTE accesses undergo the vrtual to physical translation,
as the mode that is naturally compatible with existing
ASL code.
The most rewarding gains result from (hand-made) deforestion
in ASLSem.ml, due to dramatic reduction of memory footprint.
This additions permits early  pruning of pruned executions,
resultng in more runtime gains.
Notice that spurious AF updates are not implemented.
Such a transmission is instrumental to the correct understanding of
per proc HA and HD settings.
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