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Legalized PMPconfig WARL

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This commit is contained in:
David Harris 2024-07-25 09:43:54 -07:00
parent d5af25ffbf
commit faa1378920
1 changed files with 10 additions and 3 deletions
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13
src/privileged/csrm.sv
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@ -106,7 +106,10 @@ module csrm import cvw::*; #(parameter cvw_t P) (
genvar i;
if (P.PMP_ENTRIES > 0) begin:pmp
logic [P.PMP_ENTRIES-1:0] WritePMPCFGM;
logic [P.PMP_ENTRIES-1:0] WritePMPADDRM ;
logic [P.PMP_ENTRIES-1:0] WritePMPADDRM;
logic [7:0] CSRPMPWriteValM[P.PMP_ENTRIES-1:0];
logic [7:0] CSRPMPLegalizedWriteValM[P.PMP_ENTRIES-1:0];
logic [1:0] CSRPMPWRLegalizedWriteValM[P.PMP_ENTRIES-1:0];
logic [P.PMP_ENTRIES-1:0] ADDRLocked, CFGLocked;
for(i=0; i<P.PMP_ENTRIES; i++) begin
// when the lock bit is set, don't allow writes to the PMPCFG or PMPADDR
@ -121,11 +124,15 @@ module csrm import cvw::*; #(parameter cvw_t P) (
flopenr #(P.PA_BITS-2) PMPADDRreg(clk, reset, WritePMPADDRM[i], CSRWriteValM[P.PA_BITS-3:0], PMPADDR_ARRAY_REGW[i]);
if (P.XLEN==64) begin
assign WritePMPCFGM[i] = (CSRMWriteM & (CSRAdrM == (PMPCFG0+2*(i/8)))) & ~CFGLocked[i];
flopenr #(8) PMPCFGreg(clk, reset, WritePMPCFGM[i], CSRWriteValM[(i%8)*8+7:(i%8)*8], PMPCFG_ARRAY_REGW[i]);
assign CSRPMPWriteValM[i] = CSRWriteValM[(i%8)*8+7:(i%8)*8];
end else begin
assign WritePMPCFGM[i] = (CSRMWriteM & (CSRAdrM == (PMPCFG0+i/4))) & ~CFGLocked[i];
flopenr #(8) PMPCFGreg(clk, reset, WritePMPCFGM[i], CSRWriteValM[(i%4)*8+7:(i%4)*8], PMPCFG_ARRAY_REGW[i]);
assign CSRPMPWriteValM[i] = CSRWriteValM[(i%4)*8+7:(i%4)*8];
end
assign CSRPMPWRLegalizedWriteValM[i] = {(CSRPMPWriteValM[i][1] & CSRPMPWriteValM[i][0]), CSRPMPWriteValM[i][0]}; // legalize WR fields (reserved 10 written as 00)
assign CSRPMPLegalizedWriteValM[i] = {CSRPMPWriteValM[i][7], 2'b00, CSRPMPWriteValM[i][4:2], CSRPMPWRLegalizedWriteValM[i]};
flopenr #(8) PMPCFGreg(clk, reset, WritePMPCFGM[i], CSRPMPWriteValM[i], PMPCFG_ARRAY_REGW[i]);
end
end