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Restored MPRV behavior per spec

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This commit is contained in:
David Harris 2022-04-25 14:52:18 +00:00
parent 1a8369b02b
commit 0957b7040d
1 changed files with 2 additions and 2 deletions
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4
pipelined/src/privileged/csrsr.sv
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@ -139,8 +139,8 @@ module csrsr (
STATUS_MIE <= #1 STATUS_MPIE; // restore global interrupt enable
STATUS_MPIE <= #1 1; //
STATUS_MPP <= #1 `U_SUPPORTED ? `U_MODE : `M_MODE; // set MPP to lowest supported privilege level
STATUS_MPRV_INT <= #1 0; // changed to this by Ross to solve Linux bug
//STATUS_MPRV_INT <= #1 STATUS_MPRV_INT & (STATUS_MPP == `M_MODE); // Seems to be given by page 21 of spec.
// STATUS_MPRV_INT <= #1 0; // changed to this by Ross to solve Linux bug; might have been s spurious disagreement with QEMU
STATUS_MPRV_INT <= #1 STATUS_MPRV_INT & (STATUS_MPP == `M_MODE); // Seems to be given by page 21 of spec.
end else if (sretM) begin
STATUS_SIE <= #1 STATUS_SPIE; // restore global interrupt enable
STATUS_SPIE <= #1 `S_SUPPORTED;