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feat(Backend, MemBlock): add support for Zacas extension #3958

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feat(Backend, MemBlock): add support for Zacas extension #3958

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Commits on Nov 26, 2024

  1. feat(Backend): add support for Zacas extension

    @NewPaulWalker @linjuanZ
    NewPaulWalker authored and linjuanZ committed Nov 26, 2024
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  2. misc: remove assert temporarily

    @NewPaulWalker @linjuanZ
    NewPaulWalker authored and linjuanZ committed Nov 26, 2024
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Commits on Nov 27, 2024

  1. feat(MemBlock): add support for Zacas extension

    @linjuanZ
    linjuanZ committed Nov 27, 2024
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  2. fix(AtomicsUnit, MemBlock): fix loss of multiple stds 

    In the previous design, AtomicsUnit receives stds from StdExeUnit and
arbitrate at most one std uop for one cycle. This works fine on most of
the AMOs and LR/SC because they require only one std uop. However AMOCAS
requires at least two std uops, which may be issued from two separate
issue queues at the same time, leading to the loss of std uops.

This commit fixes this by taking all the outputs of the StdExeUnits into
account with arbitration logics.
    @linjuanZ
    linjuanZ committed Nov 27, 2024
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  3. fix(AtomicsUnit): DCache req can only be sent at s_cache_req

    @linjuanZ
    linjuanZ committed Nov 27, 2024
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  4. fix(AtomicsUnit, difftest): fix difftest io for atomic events

    @linjuanZ
    linjuanZ committed Nov 27, 2024
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Commits on Nov 28, 2024

  1. fix(MainPipe): fix precedence of & and =/= operator

    @linjuanZ
    linjuanZ committed Nov 28, 2024
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  2. fix(MainPipe): AMOCAS should not wait for AMOALU

    @linjuanZ
    linjuanZ committed Nov 28, 2024
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  3. fix(MemBlock): remove unnecessary assertion

    @linjuanZ
    linjuanZ committed Nov 28, 2024
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Commits on Nov 30, 2024

  1. submodule(difftest): re-format

    @linjuanZ
    linjuanZ committed Nov 30, 2024
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  2. submodule(ready-to-run): bump nemu and spike ref

    @linjuanZ
    linjuanZ committed Nov 30, 2024
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Commits on Dec 4, 2024

  1. fix(MainPipe): only CAS instruction can assert s3_cas_fail

    @linjuanZ
    linjuanZ committed Dec 4, 2024
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  2. submodule(difftest): fix AMOCAS FuOpType

    @linjuanZ
    linjuanZ committed Dec 4, 2024
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