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improve testbench-linux.sv to correctly load in PLIC IntEnable checkpoint and to handle edge case where interrupt is caused by enabling interrupts in SSTATUS

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bbracker 2022-04-13 03:37:53 -07:00
parent 0d4ec9b3f9
commit 3465d8cd32
2 changed files with 24 additions and 6 deletions
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1
linux/testvector-generation/parsePlicState.py
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@ -98,6 +98,7 @@ with open(outDir+'checkpoint-PLIC_INT_PRIORITY', 'w') as outFile:
outFile.write(stripZeroes(word[2:])+'\n')
with open(outDir+'checkpoint-PLIC_INT_ENABLE', 'w') as outFile:
for word in plicIntEnableArray:
word = hex(int(word,16)>>1)[2:] # right shift by 1 because source 0 does not exist
outFile.write(stripZeroes(word)+'\n')
with open(outDir+'checkpoint-PLIC_THRESHOLD', 'w') as outFile:
for word in plicIntPriorityThresholdArray:

29
pipelined/testbench/testbench-linux.sv
View file

@ -182,6 +182,7 @@ module testbench;
`define UART_LCR `UART.LCR
`define UART_MCR `UART.MCR
`define UART_SCR `UART.SCR
`define UART_IP `UART.INTR
`define PLIC dut.uncore.plic.plic
`define PLIC_INT_PRIORITY `PLIC.intPriority
`define PLIC_INT_ENABLE `PLIC.intEn
@ -376,7 +377,7 @@ module testbench;
`INIT_CHECKPOINT_VAL(SATP, [`XLEN-1:0]);
`INIT_CHECKPOINT_VAL(PRIV, [1:0]);
`INIT_CHECKPOINT_PACKED_ARRAY(PLIC_INT_PRIORITY, [2:0],`PLIC_NUM_SRC,1);
`INIT_CHECKPOINT_PACKED_ARRAY(PLIC_INT_ENABLE, [`PLIC_NUM_SRC:1],1,0);
`MAKE_CHECKPOINT_INIT_SIGNAL(PLIC_INT_ENABLE, [`PLIC_NUM_SRC:0],1,0);
`INIT_CHECKPOINT_PACKED_ARRAY(PLIC_THRESHOLD, [2:0],1,0);
// UART checkpointing does not cover entire UART state
// Many UART registers are difficult to initialize because under the hood
@ -399,6 +400,7 @@ module testbench;
if(!NO_IE_MTIME_CHECKPOINT) begin
force `MEIP = 0;
force `SEIP = 0;
force `UART_IP = 0;
force `MTIP = 0;
end
$sformat(testvectorDir,"%s/linux-testvectors/",RISCV_DIR);
@ -446,6 +448,7 @@ module testbench;
force {`STATUS_SPP,`STATUS_MPIE} = initMSTATUS[0][8:7];
force {`STATUS_SPIE,`STATUS_UPIE,`STATUS_MIE} = initMSTATUS[0][5:3];
force {`STATUS_SIE,`STATUS_UIE} = initMSTATUS[0][1:0];
force `PLIC_INT_ENABLE = {initPLIC_INT_ENABLE[1][`PLIC_NUM_SRC:1],initPLIC_INT_ENABLE[0][`PLIC_NUM_SRC:1]}; // would need to expand into a generate loop to cover an arbitrary number of contexts
force `INSTRET = CHECKPOINT;
while (reset!==1) #1;
while (reset!==0) #1;
@ -455,6 +458,7 @@ module testbench;
release {`STATUS_SPP,`STATUS_MPIE};
release {`STATUS_SPIE,`STATUS_UPIE,`STATUS_MIE};
release {`STATUS_SIE,`STATUS_UIE};
release `PLIC_INT_ENABLE;
release `INSTRET;
end
// Get the E-stage trace reader ahead of the M-stage trace reader
@ -701,6 +705,8 @@ module testbench;
force `MEIP = 0;
if ((ExpectedCSRArrayValueW[NumCSRPostWIndex] & 1<<09) == 0)
force `SEIP = 0;
if ((ExpectedCSRArrayValueW[NumCSRPostWIndex] & ((1<<11) | (1<<09))) == 0)
force `UART_IP = 0;
if ((ExpectedCSRArrayValueW[NumCSRPostWIndex] & 1<<07) == 0)
force `MTIP = 0;
end
@ -724,17 +730,28 @@ module testbench;
if((interruptInstrCount+1) == AttemptedInstructionCount) begin
if(!NO_IE_MTIME_CHECKPOINT) begin
case (interruptCauseVal)
11: force `MEIP = 1;
09: force `SEIP = 1;
11: begin
force `MEIP = 1;
force `UART_IP = 1;
end
09: begin
force `SEIP = 1;
force `UART_IP = 1;
end
07: force `MTIP = 1;
default: $display("Unsupported interrupt in interrupts.txt. cause = %0d",interruptCauseVal);
endcase
$display("Forcing interrupt.");
end
`SCAN_NEW_INTERRUPT
garbageInt = $fgets(garbageString,traceFileE);
garbageInt = $fgets(garbageString,traceFileM);
AttemptedInstructionCount += 1;
#1;
if ((`CSR_BASE.csrm.WriteMSTATUSM || `CSR_BASE.csrs.WriteSSTATUSM) && |(`CSR_BASE.CSRWriteValM & ~`CSR_BASE.csrm.MSTATUS_REGW & 32'h22)) begin
$display("Enabled global interrupts");
end else begin
garbageInt = $fgets(garbageString,traceFileE);
garbageInt = $fgets(garbageString,traceFileM);
AttemptedInstructionCount += 1;
end
end
end
end