riscv/rocket-chip
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Separate I$ parity error from miss signal

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Handle parity errors with a pipeline flush rather than a faster
frontend replay, reducing a critical path.
This commit is contained in:
Andrew Waterman 2017-08-04 00:37:13 -07:00
parent 06a831310b
commit a45997d03f
2 changed files with 4 additions and 2 deletions
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2
src/main/scala/rocket/Frontend.scala
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@ -149,7 +149,7 @@ class FrontendModule(outer: Frontend) extends LazyModuleImp(outer)
fq.io.enq.bits.data := icache.io.resp.bits.data
fq.io.enq.bits.mask := UInt((1 << fetchWidth)-1) << s2_pc.extract(log2Ceil(fetchWidth)+log2Ceil(coreInstBytes)-1, log2Ceil(coreInstBytes))
fq.io.enq.bits.replay := icache.io.s2_kill && !icache.io.resp.valid && !s2_xcpt
fq.io.enq.bits.replay := icache.io.resp.bits.replay || icache.io.s2_kill && !icache.io.resp.valid && !s2_xcpt
fq.io.enq.bits.btb.valid := s2_btb_resp_valid
fq.io.enq.bits.btb.bits := s2_btb_resp_bits
fq.io.enq.bits.xcpt := s2_tlb_resp

4
src/main/scala/rocket/ICache.scala
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@ -63,6 +63,7 @@ class ICache(val icacheParams: ICacheParams, val hartid: Int)(implicit p: Parame
class ICacheResp(outer: ICache) extends Bundle {
val data = UInt(width = outer.icacheParams.fetchBytes*8)
val replay = Bool()
val ae = Bool()
override def cloneType = new ICacheResp(outer).asInstanceOf[this.type]
@ -259,7 +260,8 @@ class ICacheModule(outer: ICache) extends LazyModuleImp(outer)
io.resp.bits.data := s2_data_decoded.uncorrected
io.resp.bits.ae := s2_tl_error
io.resp.valid := s2_valid && s2_hit && !s2_disparity
io.resp.bits.replay := s2_disparity
io.resp.valid := s2_valid && s2_hit
tl_in.map { tl =>
val respValid = RegInit(false.B)