51 lines
2.1 KiB
Scala
51 lines
2.1 KiB
Scala
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// See LICENSE.SiFive for license details.
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package freechips.rocketchip.tilelink
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import Chisel._
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import freechips.rocketchip.config.Parameters
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import freechips.rocketchip.diplomacy._
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import freechips.rocketchip.util._
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// An ErrorEvaluator is used for test harnesses.
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// It creates errors in transactions which overlap an address in pattern.
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// If testOn is true, it will assert fail if these transactions do not already error.
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// If testOff is true, it will assert fail if these transactions otherwise error.
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// This helps when building unit tests to confirm that errors are propagated correctly.
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class TLErrorEvaluator(pattern: Seq[AddressSet], testOn: Boolean, testOff: Boolean)(implicit p: Parameters) extends LazyModule
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{
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val node = TLAdapterNode()
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lazy val module = new LazyModuleImp(this) {
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(node.in zip node.out) foreach { case ((in, edgeIn), (out, edgeOut)) =>
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out <> in
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// Does the request overlap the pattern ?
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val abase = in.a.bits.address
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val amask = UIntToOH1(in.a.bits.size, log2Up(edgeIn.maxTransfer))
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val overlaps = pattern.map { case a =>
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val pbase = UInt(a.base)
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val pmask = UInt(a.mask & ((BigInt(1) << edgeIn.bundle.addressBits) - 1))
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(amask | pmask | ~(abase ^ pbase)).andR
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}.reduce(_ || _)
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val (d_first, d_last, _) = edgeOut.firstlast(out.d)
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val inject = Mem(edgeIn.client.endSourceId, Bool())
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when (in.a.fire()) { inject.write(in.a.bits.source, overlaps) }
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val bypass = in.a.fire() && in.a.bits.source === in.d.bits.source
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val d_inject = Mux(bypass, overlaps, inject.read(in.d.bits.source)) holdUnless d_first
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in.d.bits.error := out.d.bits.error || (d_last && d_inject)
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assert (Bool(!testOn) || !out.d.fire() || !d_last || !d_inject || out.d.bits.error, "Error flag was not set!")
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assert (Bool(!testOff) || !out.d.fire() || !d_last || d_inject || !out.d.bits.error, "Error flag was set!")
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}
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}
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}
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object TLErrorEvaluator
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{
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def apply(pattern: Seq[AddressSet], testOn: Boolean = false, testOff: Boolean = false)(implicit p: Parameters): TLNode =
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LazyModule(new TLErrorEvaluator(pattern, testOn, testOff)).node
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}
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