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This commit is contained in:
David Harris 2023-01-13 19:50:44 -08:00
parent 370678f730
commit a9008cb293
2 changed files with 19 additions and 15 deletions
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17
pipelined/src/privileged/privmode.sv
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@ -4,7 +4,7 @@
// Written: David_Harris@hmc.edu 12 May 2022 // Written: David_Harris@hmc.edu 12 May 2022
// Modified: // Modified:
// //
// Purpose: Track privilege mode // Purpose: Track privilege mode. Change on traps and returns.
// //
// Documentation: RISC-V System on Chip Design Chapter 5 // Documentation: RISC-V System on Chip Design Chapter 5
// //
@ -30,11 +30,14 @@
module privmode ( module privmode (
input logic clk, reset, input logic clk, reset,
input logic StallW, TrapM, mretM, sretM, input logic StallW,
input logic DelegateM, input logic TrapM, // Trap
input logic [1:0] STATUS_MPP, input logic mretM, sretM, // return instruction
input logic STATUS_SPP, input logic DelegateM, // trap delegated to supervisor mode
output logic [1:0] NextPrivilegeModeM, PrivilegeModeW input logic [1:0] STATUS_MPP, // machine trap previous privilege mode
input logic STATUS_SPP, // supervisor trap previous privilege mode
output logic [1:0] NextPrivilegeModeM, // next privilege mode, used when updating STATUS CSR on a trap
output logic [1:0] PrivilegeModeW // current privilege mode
); );
if (`U_SUPPORTED) begin:privmode if (`U_SUPPORTED) begin:privmode
@ -44,7 +47,7 @@ module privmode (
if (`S_SUPPORTED & DelegateM) NextPrivilegeModeM = `S_MODE; if (`S_SUPPORTED & DelegateM) NextPrivilegeModeM = `S_MODE;
else NextPrivilegeModeM = `M_MODE; else NextPrivilegeModeM = `M_MODE;
end else if (mretM) NextPrivilegeModeM = STATUS_MPP; end else if (mretM) NextPrivilegeModeM = STATUS_MPP;
else if (sretM) NextPrivilegeModeM = {1'b0, STATUS_SPP}; else if (sretM) NextPrivilegeModeM = {1'b0, STATUS_SPP};
else NextPrivilegeModeM = PrivilegeModeW; else NextPrivilegeModeM = PrivilegeModeW;
end end

15
pipelined/src/privileged/privpiperegs.sv
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@ -32,15 +32,16 @@ module privpiperegs (
input logic clk, reset, input logic clk, reset,
input logic StallD, StallE, StallM, input logic StallD, StallE, StallM,
input logic FlushD, FlushE, FlushM, input logic FlushD, FlushE, FlushM,
input logic InstrPageFaultF, InstrAccessFaultF, input logic InstrPageFaultF, InstrAccessFaultF, // instruction faults
input logic IllegalIEUInstrFaultD, input logic IllegalIEUInstrFaultD, // illegal IEU instruction decoded
output logic InstrPageFaultM, InstrAccessFaultM, output logic InstrPageFaultM, InstrAccessFaultM, // delayed instruction faults
output logic IllegalIEUInstrFaultM output logic IllegalIEUInstrFaultM // delayed illegal IEU instruction
); );
logic InstrPageFaultD, InstrAccessFaultD; // Delayed fault signals
logic InstrPageFaultE, InstrAccessFaultE; logic InstrPageFaultD, InstrAccessFaultD;
logic IllegalIEUInstrFaultE; logic InstrPageFaultE, InstrAccessFaultE;
logic IllegalIEUInstrFaultE;
// pipeline fault signals // pipeline fault signals
flopenrc #(2) faultregD(clk, reset, FlushD, ~StallD, flopenrc #(2) faultregD(clk, reset, FlushD, ~StallD,