riscv/rocket-chip
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small changes to the dtlb arbiter

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This commit is contained in:
Yunsup Lee 2012-02-26 16:19:50 -08:00
parent 69260756bd
commit 766a039ffe
1 changed files with 7 additions and 6 deletions
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13
rocket/src/main/scala/cpu.scala
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@ -41,17 +41,22 @@ class rocketProc(resetSignal: Bool = null) extends Component(resetSignal)
val dtlbchosen = Reg(resetVal=Bits(DTLB_CPU,log2up(3))) val dtlbchosen = Reg(resetVal=Bits(DTLB_CPU,log2up(3)))
when( dtlb.io.cpu_req.ready && dtlbarb.io.out.valid ) { dtlbchosen := dtlbarb.io.chosen } when( dtlb.io.cpu_req.ready && dtlbarb.io.out.valid ) { dtlbchosen := dtlbarb.io.chosen }
// tlb respones come out a cycle later
val chosen_vec = dtlbchosen === Bits(DTLB_VEC) val chosen_vec = dtlbchosen === Bits(DTLB_VEC)
val chosen_pf = dtlbchosen === Bits(DTLB_VPF) val chosen_pf = dtlbchosen === Bits(DTLB_VPF)
val chosen_cpu = dtlbchosen === Bits(DTLB_CPU) val chosen_cpu = dtlbchosen === Bits(DTLB_CPU)
// vector prefetch doesn't care about exceptions dtlbarb.io.in(DTLB_VEC) <> vu.io.vec_tlb_req
// and shouldn't cause any anyways
vu.io.vec_tlb_resp.xcpt_ld := chosen_vec && dtlb.io.cpu_resp.xcpt_ld vu.io.vec_tlb_resp.xcpt_ld := chosen_vec && dtlb.io.cpu_resp.xcpt_ld
vu.io.vec_tlb_resp.xcpt_st := chosen_vec && dtlb.io.cpu_resp.xcpt_st vu.io.vec_tlb_resp.xcpt_st := chosen_vec && dtlb.io.cpu_resp.xcpt_st
vu.io.vec_tlb_resp.miss := chosen_vec && dtlb.io.cpu_resp.miss vu.io.vec_tlb_resp.miss := chosen_vec && dtlb.io.cpu_resp.miss
vu.io.vec_tlb_resp.ppn := dtlb.io.cpu_resp.ppn vu.io.vec_tlb_resp.ppn := dtlb.io.cpu_resp.ppn
// vector prefetch doesn't care about exceptions
// and shouldn't cause any anyways
dtlbarb.io.in(DTLB_VPF) <> vu.io.vec_pftlb_req
vu.io.vec_pftlb_resp.xcpt_ld := Bool(false) vu.io.vec_pftlb_resp.xcpt_ld := Bool(false)
vu.io.vec_pftlb_resp.xcpt_st := Bool(false) vu.io.vec_pftlb_resp.xcpt_st := Bool(false)
vu.io.vec_pftlb_resp.miss := chosen_pf && dtlb.io.cpu_resp.miss vu.io.vec_pftlb_resp.miss := chosen_pf && dtlb.io.cpu_resp.miss
@ -69,10 +74,6 @@ class rocketProc(resetSignal: Bool = null) extends Component(resetSignal)
ctrl.io.xcpt_dtlb_st := chosen_cpu && dtlb.io.cpu_resp.xcpt_st ctrl.io.xcpt_dtlb_st := chosen_cpu && dtlb.io.cpu_resp.xcpt_st
ctrl.io.dtlb_miss := chosen_cpu && dtlb.io.cpu_resp.miss ctrl.io.dtlb_miss := chosen_cpu && dtlb.io.cpu_resp.miss
dtlbarb.io.in(DTLB_VEC) <> vu.io.vec_tlb_req
dtlbarb.io.in(DTLB_VPF) <> vu.io.vec_pftlb_req
dtlb.io.cpu_req <> dtlbarb.io.out dtlb.io.cpu_req <> dtlbarb.io.out
} }
else else