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Implemented mhpmevent[3:31] as read-only zero rather than illegal

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David Harris 2024-10-15 09:08:25 -07:00
parent de8a707361
commit 150641e5d3
1 changed files with 35 additions and 31 deletions
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66
src/privileged/csrc.sv
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@ -8,7 +8,6 @@
// See RISC-V Privileged Mode Specification 20190608 3.1.10-11
//
// Documentation: RISC-V System on Chip Design
// MHPMEVENT is not supported
//
// A component of the CORE-V-WALLY configurable RISC-V project.
// https://github.com/openhwgroup/cvw
@ -66,7 +65,8 @@ module csrc import cvw::*; #(parameter cvw_t P) (
localparam MTIME = 12'hB01; // this is a memory-mapped register; no such CSR exists, and access should faul;
localparam MHPMCOUNTERHBASE = 12'hB80;
localparam MTIMEH = 12'hB81; // this is a memory-mapped register; no such CSR exists, and access should fault
localparam MHPMEVENTBASE = 12'h320;
localparam MHPMEVENTBASE = 12'h323;
localparam MHPMEVENTLAST = 12'h33F;
localparam HPMCOUNTERBASE = 12'hC00;
localparam HPMCOUNTERHBASE = 12'hC80;
localparam TIME = 12'hC01;
@ -156,37 +156,41 @@ module csrc import cvw::*; #(parameter cvw_t P) (
if (PrivilegeModeW == P.M_MODE |
MCOUNTEREN_REGW[CounterNumM] & (!P.S_SUPPORTED | PrivilegeModeW == P.S_MODE | SCOUNTEREN_REGW[CounterNumM])) begin
IllegalCSRCAccessM = 1'b0;
if (P.XLEN==64) begin // 64-bit counter reads
// Veri lator doesn't realize this only occurs for XLEN=64
/* verilator lint_off WIDTH */
if (CSRAdrM == TIME & ~CSRWriteM) CSRCReadValM = MTIME_CLINT; // TIME register is a shadow of the memory-mapped MTIME from the CLINT
/* verilator lint_on WIDTH */
else if (CSRAdrM >= MHPMCOUNTERBASE & CSRAdrM < MHPMCOUNTERBASE+P.COUNTERS & CSRAdrM != MTIME)
CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
else if (CSRAdrM >= HPMCOUNTERBASE & CSRAdrM < HPMCOUNTERBASE+P.COUNTERS & ~CSRWriteM) // read-only
CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
else begin
if (CSRAdrM >= MHPMEVENTBASE & CSRAdrM <= MHPMEVENTLAST) begin
CSRCReadValM = '0; // mphmevent[3:31] tied to read-only zero
end else begin
if (P.XLEN==64) begin // 64-bit counter reads
// Veri lator doesn't realize this only occurs for XLEN=64
/* verilator lint_off WIDTH */
if (CSRAdrM == TIME & ~CSRWriteM) CSRCReadValM = MTIME_CLINT; // TIME register is a shadow of the memory-mapped MTIME from the CLINT
/* verilator lint_on WIDTH */
else if (CSRAdrM >= MHPMCOUNTERBASE & CSRAdrM < MHPMCOUNTERBASE+P.COUNTERS & CSRAdrM != MTIME)
CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
else if (CSRAdrM >= HPMCOUNTERBASE & CSRAdrM < HPMCOUNTERBASE+P.COUNTERS & ~CSRWriteM) // read-only
CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
else begin
CSRCReadValM = '0;
IllegalCSRCAccessM = 1'b1; // requested CSR doesn't exist
end
end else begin // 32-bit counter reads
// Veril ator doesn't realize this only occurs for XLEN=32
/* verilator lint_off WIDTH */
if (CSRAdrM == TIME & ~CSRWriteM) CSRCReadValM = MTIME_CLINT[31:0];// TIME register is a shadow of the memory-mapped MTIME from the CLINT
else if (CSRAdrM == TIMEH & ~CSRWriteM) CSRCReadValM = MTIME_CLINT[63:32];
/* verilator lint_on WIDTH */
else if (CSRAdrM >= MHPMCOUNTERBASE & CSRAdrM < MHPMCOUNTERBASE+P.COUNTERS & CSRAdrM != MTIME)
CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
else if (CSRAdrM >= HPMCOUNTERBASE & CSRAdrM < HPMCOUNTERBASE+P.COUNTERS & ~CSRWriteM) // read-only
CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
else if (CSRAdrM >= MHPMCOUNTERHBASE & CSRAdrM < MHPMCOUNTERHBASE+P.COUNTERS & CSRAdrM != MTIMEH)
CSRCReadValM = HPMCOUNTERH_REGW[CounterNumM];
else if (CSRAdrM >= HPMCOUNTERHBASE & CSRAdrM < HPMCOUNTERHBASE+P.COUNTERS & ~CSRWriteM) // read-only
CSRCReadValM = HPMCOUNTERH_REGW[CounterNumM];
else begin
CSRCReadValM = '0;
IllegalCSRCAccessM = 1'b1; // requested CSR doesn't exist
IllegalCSRCAccessM = 1'b1; // requested CSR doesn't exist
end
end
end else begin // 32-bit counter reads
// Veril ator doesn't realize this only occurs for XLEN=32
/* verilator lint_off WIDTH */
if (CSRAdrM == TIME & ~CSRWriteM) CSRCReadValM = MTIME_CLINT[31:0];// TIME register is a shadow of the memory-mapped MTIME from the CLINT
else if (CSRAdrM == TIMEH & ~CSRWriteM) CSRCReadValM = MTIME_CLINT[63:32];
/* verilator lint_on WIDTH */
else if (CSRAdrM >= MHPMCOUNTERBASE & CSRAdrM < MHPMCOUNTERBASE+P.COUNTERS & CSRAdrM != MTIME)
CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
else if (CSRAdrM >= HPMCOUNTERBASE & CSRAdrM < HPMCOUNTERBASE+P.COUNTERS & ~CSRWriteM) // read-only
CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
else if (CSRAdrM >= MHPMCOUNTERHBASE & CSRAdrM < MHPMCOUNTERHBASE+P.COUNTERS & CSRAdrM != MTIMEH)
CSRCReadValM = HPMCOUNTERH_REGW[CounterNumM];
else if (CSRAdrM >= HPMCOUNTERHBASE & CSRAdrM < HPMCOUNTERHBASE+P.COUNTERS & ~CSRWriteM) // read-only
CSRCReadValM = HPMCOUNTERH_REGW[CounterNumM];
else begin
CSRCReadValM = '0;
IllegalCSRCAccessM = 1'b1; // requested CSR doesn't exist
end
end
end else begin
CSRCReadValM = '0;