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Updated comments about Interrupt and wfi.

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This commit is contained in:
Rose Thompson 2023-10-26 12:24:36 -05:00
parent 4cd0584a11
commit 06b5a92eff
1 changed files with 2 additions and 1 deletions
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src/privileged/trap.sv
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@ -68,7 +68,8 @@ module trap import cvw::*; #(parameter cvw_t P) (
assign Committed = CommittedM | CommittedF;
assign EnabledIntsM = ({12{MIntGlobalEnM}} & PendingIntsM & ~MIDELEG_REGW | {12{SIntGlobalEnM}} & PendingIntsM & MIDELEG_REGW);
assign ValidIntsM = {12{~Committed}} & EnabledIntsM;
assign InterruptM = (|ValidIntsM) & InstrValidM & (~wfiM | wfiW); // suppress interrupt if the memory system has partially processed a request.
assign InterruptM = (|ValidIntsM) & InstrValidM & (~wfiM | wfiW); // suppress interrupt if the memory system has partially processed a request. Delay interrupt until wfi is in the W stage.
// wfiW is to support possible but unlikely back to back wfi instructions. wfiM would be high in the M stage, while also in the W stage.
assign DelegateM = P.S_SUPPORTED & (InterruptM ? MIDELEG_REGW[CauseM] : MEDELEG_REGW[CauseM]) &
(PrivilegeModeW == P.U_MODE | PrivilegeModeW == P.S_MODE);