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Add customDecoder interface to rocket #3564

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Add customDecoder interface to rocket #3564

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8 changes: 7 additions & 1 deletion src/main/scala/rocket/RocketCore.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,8 @@ case class RocketCoreParams(
fpu: Option[FPUParams] = Some(FPUParams()),
debugROB: Boolean = false, // if enabled, uses a C++ debug ROB to generate trace-with-wdata
haveCease: Boolean = true, // non-standard CEASE instruction
haveSimTimeout: Boolean = true // add plusarg for simulation timeout
haveSimTimeout: Boolean = true, // add plusarg for simulation timeout
customDecoder: Option[UInt => IntCtrlSigs] = None // custom decoder implementation
) extends CoreParams {
val lgPauseCycles = 5
val haveFSDirty = false
Expand Down Expand Up @@ -298,6 +299,11 @@ class Rocket(tile: RocketTile)(implicit p: Parameters) extends CoreModule()(p)
require(!(coreParams.useRVE && coreParams.fpu.nonEmpty), "Can't select both RVE and floating-point")
require(!(coreParams.useRVE && coreParams.useHypervisor), "Can't select both RVE and Hypervisor")
val id_ctrl = Wire(new IntCtrlSigs(aluFn)).decode(id_inst(0), decode_table)
if (rocketParams.customDecoder.isDefined) {
id_ctrl := rocketParams.customDecoder.get(id_inst(0))
} else {
id_ctrl.decode(id_inst(0), decode_table)
}
val lgNXRegs = if (coreParams.useRVE) 4 else 5
val regAddrMask = (1 << lgNXRegs) - 1

Expand Down