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Fixed two bugs: (1) not trapping on unimplemented CSRs (2) MSTATUS.FS initialization

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(1) riscy-ooo was mapping all unimplemented CSRs to a benign, user-privilege read-write CSR
    Instead, we now catch this RenameStage and steer it to a trap.
(2) MSTATUS.FS was initialized to 2'b00 (absent/off); should be 2'b01 (present and initial)
This commit is contained in:
rsnikhil
2020-03-03 13:56:31 -05:00
parent e02dac1449
commit ac6043ce2d
42 changed files with 84138 additions and 84088 deletions
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2
src_Core/CPU/CsrFile.bsv
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@@ -310,7 +310,7 @@ module mkCsrFile #(Data hartid)(CsrFile);
// Machine level CSRs
// mstatus
Reg#(Bit#(2)) xs_reg <- mkReadOnlyReg(0); // XXX no extension
Reg#(Bit#(2)) fs_reg <- (isa.f || isa.d) ? mkCsrReg(0) : mkReadOnlyReg(0);
Reg#(Bit#(2)) fs_reg <- (isa.f || isa.d) ? mkCsrReg(2'b01) : mkReadOnlyReg(0);
Reg#(Bit#(1)) sd_reg = readOnlyReg(
((xs_reg == 2'b11) || (fs_reg == 2'b11)) ? 1 : 0
);