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https://github.com/openhwgroup/cvw
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Detect illegal writes to URO HPM counters
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@ -159,11 +159,11 @@ module csrc import cvw::*; #(parameter cvw_t P) (
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if (P.XLEN==64) begin // 64-bit counter reads
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// Veri lator doesn't realize this only occurs for XLEN=64
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/* verilator lint_off WIDTH */
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if (CSRAdrM == TIME) CSRCReadValM = MTIME_CLINT; // TIME register is a shadow of the memory-mapped MTIME from the CLINT
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if (CSRAdrM == TIME & ~CSRWriteM) CSRCReadValM = MTIME_CLINT; // TIME register is a shadow of the memory-mapped MTIME from the CLINT
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/* verilator lint_on WIDTH */
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else if (CSRAdrM >= MHPMCOUNTERBASE & CSRAdrM < MHPMCOUNTERBASE+P.COUNTERS & CSRAdrM != MTIME)
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CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
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else if (CSRAdrM >= HPMCOUNTERBASE & CSRAdrM < HPMCOUNTERBASE+P.COUNTERS)
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else if (CSRAdrM >= HPMCOUNTERBASE & CSRAdrM < HPMCOUNTERBASE+P.COUNTERS & ~CSRWriteM) // read-only
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CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
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else begin
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CSRCReadValM = '0;
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@ -172,16 +172,16 @@ module csrc import cvw::*; #(parameter cvw_t P) (
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end else begin // 32-bit counter reads
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// Veril ator doesn't realize this only occurs for XLEN=32
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/* verilator lint_off WIDTH */
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if (CSRAdrM == TIME) CSRCReadValM = MTIME_CLINT[31:0];// TIME register is a shadow of the memory-mapped MTIME from the CLINT
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else if (CSRAdrM == TIMEH) CSRCReadValM = MTIME_CLINT[63:32];
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if (CSRAdrM == TIME & ~CSRWriteM) CSRCReadValM = MTIME_CLINT[31:0];// TIME register is a shadow of the memory-mapped MTIME from the CLINT
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else if (CSRAdrM == TIMEH & ~CSRWriteM) CSRCReadValM = MTIME_CLINT[63:32];
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/* verilator lint_on WIDTH */
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else if (CSRAdrM >= MHPMCOUNTERBASE & CSRAdrM < MHPMCOUNTERBASE+P.COUNTERS & CSRAdrM != MTIME)
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CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
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else if (CSRAdrM >= HPMCOUNTERBASE & CSRAdrM < HPMCOUNTERBASE+P.COUNTERS)
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else if (CSRAdrM >= HPMCOUNTERBASE & CSRAdrM < HPMCOUNTERBASE+P.COUNTERS & ~CSRWriteM) // read-only
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CSRCReadValM = HPMCOUNTER_REGW[CounterNumM];
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else if (CSRAdrM >= MHPMCOUNTERHBASE & CSRAdrM < MHPMCOUNTERHBASE+P.COUNTERS & CSRAdrM != MTIMEH)
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CSRCReadValM = HPMCOUNTERH_REGW[CounterNumM];
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else if (CSRAdrM >= HPMCOUNTERHBASE & CSRAdrM < HPMCOUNTERHBASE+P.COUNTERS)
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else if (CSRAdrM >= HPMCOUNTERHBASE & CSRAdrM < HPMCOUNTERHBASE+P.COUNTERS & ~CSRWriteM) // read-only
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CSRCReadValM = HPMCOUNTERH_REGW[CounterNumM];
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else begin
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CSRCReadValM = '0;
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