riscv/rocket-chip
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Reg standardization

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This commit is contained in:
Henry Cook
2013-08-13 17:50:02 -07:00
parent 858169917e
commit b570435847
6 changed files with 45 additions and 58 deletions
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69
rocket/src/main/scala/nbdcache.scala
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@ -43,6 +43,11 @@ case class DCacheConfig(sets: Int, ways: Int,
val lrsc_cycles = 32 // ISA requires 16-insn LRSC sequences to succeed
}
abstract trait DCacheBundle extends Bundle {
implicit val conf: DCacheConfig
override def clone = this.getClass.getConstructors.head.newInstance(conf).asInstanceOf[this.type]
}
abstract class ReplacementPolicy
{
def way: UInt
@ -102,30 +107,22 @@ class MSHRReq(implicit conf: DCacheConfig) extends HellaCacheReq {
val tag_match = Bool()
val old_meta = new MetaData
val way_en = Bits(width = conf.ways)
override def clone = new MSHRReq().asInstanceOf[this.type]
}
class Replay(implicit conf: DCacheConfig) extends HellaCacheReq {
val sdq_id = UInt(width = log2Up(conf.nsdq))
override def clone = new Replay().asInstanceOf[this.type]
}
class DataReadReq(implicit conf: DCacheConfig) extends Bundle {
class DataReadReq(implicit val conf: DCacheConfig) extends DCacheBundle {
val way_en = Bits(width = conf.ways)
val addr = Bits(width = conf.untagbits)
override def clone = new DataReadReq().asInstanceOf[this.type]
}
class DataWriteReq(implicit conf: DCacheConfig) extends Bundle {
class DataWriteReq(implicit val conf: DCacheConfig) extends DCacheBundle {
val way_en = Bits(width = conf.ways)
val addr = Bits(width = conf.untagbits)
val wmask = Bits(width = conf.wordsperrow)
val data = Bits(width = conf.bitsperrow)
override def clone = new DataWriteReq().asInstanceOf[this.type]
}
class InternalProbe(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends Probe {
@ -152,25 +149,19 @@ object MetaData {
meta
}
}
class MetaData(implicit conf: DCacheConfig) extends Bundle {
class MetaData(implicit val conf: DCacheConfig) extends DCacheBundle {
val state = UInt(width = conf.statebits)
val tag = Bits(width = conf.tagbits)
override def clone = new MetaData().asInstanceOf[this.type]
}
class MetaReadReq(implicit conf: DCacheConfig) extends Bundle {
class MetaReadReq(implicit val conf: DCacheConfig) extends DCacheBundle {
val addr = UInt(width = conf.paddrbits)
override def clone = new MetaReadReq().asInstanceOf[this.type]
}
class MetaWriteReq(implicit conf: DCacheConfig) extends Bundle {
class MetaWriteReq(implicit val conf: DCacheConfig) extends DCacheBundle {
val way_en = Bits(width = conf.ways)
val idx = Bits(width = conf.idxbits)
val data = new MetaData()
override def clone = new MetaWriteReq().asInstanceOf[this.type]
}
class MSHR(id: Int)(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends Module {
@ -420,7 +411,7 @@ class MSHRFile(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends M
io.mem_resp := memRespMux(io.mem_grant.bits.payload.client_xact_id)
val free_sdq = io.replay.fire() && isWrite(io.replay.bits.cmd)
io.replay.bits.data := sdq(RegEn(replay_arb.io.out.bits.sdq_id, free_sdq))
io.replay.bits.data := sdq(RegEnable(replay_arb.io.out.bits.sdq_id, free_sdq))
io.replay <> replay_arb.io.out
when (io.replay.valid || sdq_enq) {
@ -597,7 +588,7 @@ class MetaDataArray(implicit conf: DCacheConfig, tl: TileLinkConfiguration) exte
val mask = Mux(rst, SInt(-1), io.write.bits.way_en)
tags.write(addr, Fill(conf.ways, data), FillInterleaved(metabits, mask))
}
val tag = tags(RegEn(io.read.bits.addr >> conf.offbits, io.read.valid))
val tag = tags(RegEnable(io.read.bits.addr >> conf.offbits, io.read.valid))
for (w <- 0 until conf.ways) {
val m = tag(metabits*(w+1)-1, metabits*w)
@ -624,7 +615,7 @@ class DataArray(implicit conf: DCacheConfig) extends Module {
val wway_en = io.write.bits.way_en(w+conf.wordsperrow-1,w)
val rway_en = io.read.bits.way_en(w+conf.wordsperrow-1,w)
val resp = Vec.fill(conf.wordsperrow){Bits(width = conf.bitsperrow)}
val r_raddr = RegEn(io.read.bits.addr, io.read.valid)
val r_raddr = RegEnable(io.read.bits.addr, io.read.valid)
for (p <- 0 until resp.size) {
val array = Mem(Bits(width=conf.bitsperrow), conf.sets*REFILL_CYCLES, seqRead = true)
when (wway_en.orR && io.write.valid && io.write.bits.wmask(p)) {
@ -632,7 +623,7 @@ class DataArray(implicit conf: DCacheConfig) extends Module {
val mask = FillInterleaved(conf.encdatabits, wway_en)
array.write(waddr, data, mask)
}
resp(p) := array(RegEn(raddr, rway_en.orR && io.read.valid))
resp(p) := array(RegEnable(raddr, rway_en.orR && io.read.valid))
}
for (dw <- 0 until conf.wordsperrow) {
val r = AVec(resp.map(_(conf.encdatabits*(dw+1)-1,conf.encdatabits*dw)))
@ -649,7 +640,7 @@ class DataArray(implicit conf: DCacheConfig) extends Module {
when (io.write.bits.way_en(w) && io.write.valid) {
array.write(waddr, io.write.bits.data, wmask)
}
io.resp(w) := array(RegEn(raddr, io.read.bits.way_en(w) && io.read.valid))
io.resp(w) := array(RegEnable(raddr, io.read.bits.way_en(w) && io.read.valid))
}
}
@ -695,7 +686,7 @@ class AMOALU(implicit conf: DCacheConfig) extends Module {
io.out := wmask & out | ~wmask & io.lhs
}
class HellaCacheReq(implicit conf: DCacheConfig) extends Bundle {
class HellaCacheReq(implicit val conf: DCacheConfig) extends DCacheBundle {
val kill = Bool()
val typ = Bits(width = 3)
val phys = Bool()
@ -703,11 +694,9 @@ class HellaCacheReq(implicit conf: DCacheConfig) extends Bundle {
val data = Bits(width = conf.databits)
val tag = Bits(width = conf.reqtagbits)
val cmd = Bits(width = 4)
override def clone = new HellaCacheReq().asInstanceOf[this.type]
}
class HellaCacheResp(implicit conf: DCacheConfig) extends Bundle {
class HellaCacheResp(implicit val conf: DCacheConfig) extends DCacheBundle {
val nack = Bool() // comes 2 cycles after req.fire
val replay = Bool()
val typ = Bits(width = 3)
@ -717,8 +706,6 @@ class HellaCacheResp(implicit conf: DCacheConfig) extends Bundle {
val cmd = Bits(width = 4)
val addr = UInt(width = conf.maxaddrbits)
val store_data = Bits(width = conf.databits)
override def clone = new HellaCacheResp().asInstanceOf[this.type]
}
class AlignmentExceptions extends Bundle {
@ -756,15 +743,15 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
val mshrs = Module(new MSHRFile)
io.cpu.req.ready := Bool(true)
val s1_valid = Reg(update=io.cpu.req.fire(), reset=Bool(false))
val s1_valid = Reg(updateData=io.cpu.req.fire(), resetData=Bool(false))
val s1_req = Reg(io.cpu.req.bits.clone)
val s1_valid_masked = s1_valid && !io.cpu.req.bits.kill
val s1_replay = RegReset(Bool(false))
val s1_clk_en = Reg(Bool())
val s2_valid = Reg(update=s1_valid_masked, reset=Bool(false))
val s2_valid = Reg(updateData=s1_valid_masked, resetData=Bool(false))
val s2_req = Reg(io.cpu.req.bits.clone)
val s2_replay = Reg(update=s1_replay, reset=Bool(false))
val s2_replay = Reg(updateData=s1_replay, resetData=Bool(false))
val s2_recycle = Bool()
val s2_valid_masked = Bool()
@ -772,7 +759,7 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
val s3_req = Reg(io.cpu.req.bits.clone)
val s3_way = Reg(Bits())
val s1_recycled = RegEn(s2_recycle, s1_clk_en)
val s1_recycled = RegEnable(s2_recycle, s1_clk_en)
val s1_read = isRead(s1_req.cmd)
val s1_write = isWrite(s1_req.cmd)
val s1_readwrite = s1_read || s1_write || isPrefetch(s1_req.cmd)
@ -872,9 +859,9 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
val s1_tag_match_way = wayMap((w: Int) => s1_tag_eq_way(w) && tl.co.isValid(meta.io.resp(w).state)).toBits
s1_clk_en := metaReadArb.io.out.valid
val s1_writeback = s1_clk_en && !s1_valid && !s1_replay
val s2_tag_match_way = RegEn(s1_tag_match_way, s1_clk_en)
val s2_tag_match_way = RegEnable(s1_tag_match_way, s1_clk_en)
val s2_tag_match = s2_tag_match_way.orR
val s2_hit_state = Mux1H(s2_tag_match_way, wayMap((w: Int) => RegEn(meta.io.resp(w).state, s1_clk_en)))
val s2_hit_state = Mux1H(s2_tag_match_way, wayMap((w: Int) => RegEnable(meta.io.resp(w).state, s1_clk_en)))
val s2_hit = s2_tag_match && tl.co.isHit(s2_req.cmd, s2_hit_state) && s2_hit_state === tl.co.newStateOnHit(s2_req.cmd, s2_hit_state)
// load-reserved/store-conditional
@ -931,8 +918,8 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
// replacement policy
val replacer = new RandomReplacement
val s1_replaced_way_en = UIntToOH(replacer.way)
val s2_replaced_way_en = UIntToOH(RegEn(replacer.way, s1_clk_en))
val s2_repl_meta = Mux1H(s2_replaced_way_en, wayMap((w: Int) => RegEn(meta.io.resp(w), s1_clk_en && s1_replaced_way_en(w))).toSeq)
val s2_replaced_way_en = UIntToOH(RegEnable(replacer.way, s1_clk_en))
val s2_repl_meta = Mux1H(s2_replaced_way_en, wayMap((w: Int) => RegEnable(meta.io.resp(w), s1_clk_en && s1_replaced_way_en(w))).toSeq)
// miss handling
mshrs.io.req.valid := s2_valid_masked && !s2_hit && (isPrefetch(s2_req.cmd) || isRead(s2_req.cmd) || isWrite(s2_req.cmd))
@ -993,8 +980,8 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
FIFOedLogicalNetworkIOWrapper(wb.io.release_data) <> io.mem.release.data
// store->load bypassing
val s4_valid = Reg(update=s3_valid, reset=Bool(false))
val s4_req = RegEn(s3_req, s3_valid && metaReadArb.io.out.valid)
val s4_valid = Reg(updateData=s3_valid, resetData=Bool(false))
val s4_req = RegEnable(s3_req, s3_valid && metaReadArb.io.out.valid)
val bypasses = List(
((s2_valid_masked || s2_replay) && !s2_sc_fail, s2_req, amoalu.io.out),
(s3_valid, s3_req, s3_req.data),
@ -1022,7 +1009,7 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
// nack it like it's hot
val s1_nack = dtlb.io.req.valid && dtlb.io.resp.miss ||
s1_req.addr(indexmsb,indexlsb) === prober.io.meta_write.bits.idx && !prober.io.req.ready
val s2_nack_hit = RegEn(s1_nack, s1_valid || s1_replay)
val s2_nack_hit = RegEnable(s1_nack, s1_valid || s1_replay)
when (s2_nack_hit) { mshrs.io.req.valid := Bool(false) }
val s2_nack_victim = s2_hit && mshrs.io.secondary_miss
val s2_nack_miss = !s2_hit && !mshrs.io.req.ready