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RocketCore.scala
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RocketCore.scala
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// See LICENSE.Berkeley for license details.
// See LICENSE.SiFive for license details.
package freechips.rocketchip.rocket
import chisel3._
import chisel3.util._
import chisel3.withClock
import org.chipsalliance.cde.config.Parameters
import freechips.rocketchip.tile._
import freechips.rocketchip.util._
import freechips.rocketchip.util.property
import scala.collection.mutable.ArrayBuffer
case class RocketCoreParams(
bootFreqHz: BigInt = 0,
useVM: Boolean = true,
useUser: Boolean = false,
useSupervisor: Boolean = false,
useHypervisor: Boolean = false,
useDebug: Boolean = true,
useAtomics: Boolean = true,
useAtomicsOnlyForIO: Boolean = false,
useCompressed: Boolean = true,
useRVE: Boolean = false,
useConditionalZero: Boolean = false,
nLocalInterrupts: Int = 0,
useNMI: Boolean = false,
nBreakpoints: Int = 1,
useBPWatch: Boolean = false,
mcontextWidth: Int = 0,
scontextWidth: Int = 0,
nPMPs: Int = 8,
nPerfCounters: Int = 0,
haveBasicCounters: Boolean = true,
haveCFlush: Boolean = false,
misaWritable: Boolean = true,
nL2TLBEntries: Int = 0,
nL2TLBWays: Int = 1,
nPTECacheEntries: Int = 8,
mtvecInit: Option[BigInt] = Some(BigInt(0)),
mtvecWritable: Boolean = true,
fastLoadWord: Boolean = true,
fastLoadByte: Boolean = false,
branchPredictionModeCSR: Boolean = false,
clockGate: Boolean = false,
mvendorid: Int = 0, // 0 means non-commercial implementation
mimpid: Int = 0x20181004, // release date in BCD
mulDiv: Option[MulDivParams] = Some(MulDivParams()),
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
) extends CoreParams {
val lgPauseCycles = 5
val haveFSDirty = false
val pmpGranularity: Int = if (useHypervisor) 4096 else 4
val fetchWidth: Int = if (useCompressed) 2 else 1
// fetchWidth doubled, but coreInstBytes halved, for RVC:
val decodeWidth: Int = fetchWidth / (if (useCompressed) 2 else 1)
val retireWidth: Int = 1
val instBits: Int = if (useCompressed) 16 else 32
val lrscCycles: Int = 80 // worst case is 14 mispredicted branches + slop
val traceHasWdata: Boolean = false // ooo wb, so no wdata in trace
override val customIsaExt = Option.when(haveCease)("xrocket") // CEASE instruction
override def minFLen: Int = fpu.map(_.minFLen).getOrElse(32)
override def customCSRs(implicit p: Parameters) = new RocketCustomCSRs
}
trait HasRocketCoreParameters extends HasCoreParameters {
lazy val rocketParams: RocketCoreParams = tileParams.core.asInstanceOf[RocketCoreParams]
val fastLoadWord = rocketParams.fastLoadWord
val fastLoadByte = rocketParams.fastLoadByte
val mulDivParams = rocketParams.mulDiv.getOrElse(MulDivParams()) // TODO ask andrew about this
val aluFn = new ALUFN
require(!fastLoadByte || fastLoadWord)
require(!rocketParams.haveFSDirty, "rocket doesn't support setting fs dirty from outside, please disable haveFSDirty")
}
class RocketCustomCSRs(implicit p: Parameters) extends CustomCSRs with HasRocketCoreParameters {
override def bpmCSR = {
rocketParams.branchPredictionModeCSR.option(CustomCSR(bpmCSRId, BigInt(1), Some(BigInt(0))))
}
private def haveDCache = tileParams.dcache.get.scratch.isEmpty
override def chickenCSR = {
val mask = BigInt(
tileParams.dcache.get.clockGate.toInt << 0 |
rocketParams.clockGate.toInt << 1 |
rocketParams.clockGate.toInt << 2 |
1 << 3 | // disableSpeculativeICacheRefill
haveDCache.toInt << 9 | // suppressCorruptOnGrantData
tileParams.icache.get.prefetch.toInt << 17
)
Some(CustomCSR(chickenCSRId, mask, Some(mask)))
}
def disableICachePrefetch = getOrElse(chickenCSR, _.value(17), true.B)
def marchid = CustomCSR.constant(CSRs.marchid, BigInt(1))
def mvendorid = CustomCSR.constant(CSRs.mvendorid, BigInt(rocketParams.mvendorid))
// mimpid encodes a release version in the form of a BCD-encoded datestamp.
def mimpid = CustomCSR.constant(CSRs.mimpid, BigInt(rocketParams.mimpid))
override def decls = super.decls :+ marchid :+ mvendorid :+ mimpid
}
class Rocket(tile: RocketTile)(implicit p: Parameters) extends CoreModule()(p)
with HasRocketCoreParameters
with HasCoreIO {
def nTotalRoCCCSRs = tile.roccCSRs.flatten.size
val clock_en_reg = RegInit(true.B)
val long_latency_stall = Reg(Bool())
val id_reg_pause = Reg(Bool())
val imem_might_request_reg = Reg(Bool())
val clock_en = WireDefault(true.B)
val gated_clock =
if (!rocketParams.clockGate) clock
else ClockGate(clock, clock_en, "rocket_clock_gate")
class RocketImpl { // entering gated-clock domain
// performance counters
def pipelineIDToWB[T <: Data](x: T): T =
RegEnable(RegEnable(RegEnable(x, !ctrl_killd), ex_pc_valid), mem_pc_valid)
val perfEvents = new EventSets(Seq(
new EventSet((mask, hits) => Mux(wb_xcpt, mask(0), wb_valid && pipelineIDToWB((mask & hits).orR)), Seq(
("exception", () => false.B),
("load", () => id_ctrl.mem && id_ctrl.mem_cmd === M_XRD && !id_ctrl.fp),
("store", () => id_ctrl.mem && id_ctrl.mem_cmd === M_XWR && !id_ctrl.fp),
("amo", () => usingAtomics.B && id_ctrl.mem && (isAMO(id_ctrl.mem_cmd) || id_ctrl.mem_cmd.isOneOf(M_XLR, M_XSC))),
("system", () => id_ctrl.csr =/= CSR.N),
("arith", () => id_ctrl.wxd && !(id_ctrl.jal || id_ctrl.jalr || id_ctrl.mem || id_ctrl.fp || id_ctrl.mul || id_ctrl.div || id_ctrl.csr =/= CSR.N)),
("branch", () => id_ctrl.branch),
("jal", () => id_ctrl.jal),
("jalr", () => id_ctrl.jalr))
++ (if (!usingMulDiv) Seq() else Seq(
("mul", () => if (pipelinedMul) id_ctrl.mul else id_ctrl.div && (id_ctrl.alu_fn & aluFn.FN_DIV) =/= aluFn.FN_DIV),
("div", () => if (pipelinedMul) id_ctrl.div else id_ctrl.div && (id_ctrl.alu_fn & aluFn.FN_DIV) === aluFn.FN_DIV)))
++ (if (!usingFPU) Seq() else Seq(
("fp load", () => id_ctrl.fp && io.fpu.dec.ldst && io.fpu.dec.wen),
("fp store", () => id_ctrl.fp && io.fpu.dec.ldst && !io.fpu.dec.wen),
("fp add", () => id_ctrl.fp && io.fpu.dec.fma && io.fpu.dec.swap23),
("fp mul", () => id_ctrl.fp && io.fpu.dec.fma && !io.fpu.dec.swap23 && !io.fpu.dec.ren3),
("fp mul-add", () => id_ctrl.fp && io.fpu.dec.fma && io.fpu.dec.ren3),
("fp div/sqrt", () => id_ctrl.fp && (io.fpu.dec.div || io.fpu.dec.sqrt)),
("fp other", () => id_ctrl.fp && !(io.fpu.dec.ldst || io.fpu.dec.fma || io.fpu.dec.div || io.fpu.dec.sqrt))))),
new EventSet((mask, hits) => (mask & hits).orR, Seq(
("load-use interlock", () => id_ex_hazard && ex_ctrl.mem || id_mem_hazard && mem_ctrl.mem || id_wb_hazard && wb_ctrl.mem),
("long-latency interlock", () => id_sboard_hazard),
("csr interlock", () => id_ex_hazard && ex_ctrl.csr =/= CSR.N || id_mem_hazard && mem_ctrl.csr =/= CSR.N || id_wb_hazard && wb_ctrl.csr =/= CSR.N),
("I$ blocked", () => icache_blocked),
("D$ blocked", () => id_ctrl.mem && dcache_blocked),
("branch misprediction", () => take_pc_mem && mem_direction_misprediction),
("control-flow target misprediction", () => take_pc_mem && mem_misprediction && mem_cfi && !mem_direction_misprediction && !icache_blocked),
("flush", () => wb_reg_flush_pipe),
("replay", () => replay_wb))
++ (if (!usingMulDiv) Seq() else Seq(
("mul/div interlock", () => id_ex_hazard && (ex_ctrl.mul || ex_ctrl.div) || id_mem_hazard && (mem_ctrl.mul || mem_ctrl.div) || id_wb_hazard && wb_ctrl.div)))
++ (if (!usingFPU) Seq() else Seq(
("fp interlock", () => id_ex_hazard && ex_ctrl.fp || id_mem_hazard && mem_ctrl.fp || id_wb_hazard && wb_ctrl.fp || id_ctrl.fp && id_stall_fpu)))),
new EventSet((mask, hits) => (mask & hits).orR, Seq(
("I$ miss", () => io.imem.perf.acquire),
("D$ miss", () => io.dmem.perf.acquire),
("D$ release", () => io.dmem.perf.release),
("ITLB miss", () => io.imem.perf.tlbMiss),
("DTLB miss", () => io.dmem.perf.tlbMiss),
("L2 TLB miss", () => io.ptw.perf.l2miss)))))
val pipelinedMul = usingMulDiv && mulDivParams.mulUnroll == xLen
val decode_table = {
(if (usingMulDiv) new MDecode(pipelinedMul, aluFn) +: (xLen > 32).option(new M64Decode(pipelinedMul, aluFn)).toSeq else Nil) ++:
(if (usingAtomics) new ADecode(aluFn) +: (xLen > 32).option(new A64Decode(aluFn)).toSeq else Nil) ++:
(if (fLen >= 32) new FDecode(aluFn) +: (xLen > 32).option(new F64Decode(aluFn)).toSeq else Nil) ++:
(if (fLen >= 64) new DDecode(aluFn) +: (xLen > 32).option(new D64Decode(aluFn)).toSeq else Nil) ++:
(if (minFLen == 16) new HDecode(aluFn) +: (xLen > 32).option(new H64Decode(aluFn)).toSeq ++: (fLen >= 64).option(new HDDecode(aluFn)).toSeq else Nil) ++:
(usingRoCC.option(new RoCCDecode(aluFn))) ++:
(if (xLen == 32) new I32Decode(aluFn) else new I64Decode(aluFn)) +:
(usingVM.option(new SVMDecode(aluFn))) ++:
(usingSupervisor.option(new SDecode(aluFn))) ++:
(usingHypervisor.option(new HypervisorDecode(aluFn))) ++:
((usingHypervisor && (xLen == 64)).option(new Hypervisor64Decode(aluFn))) ++:
(usingDebug.option(new DebugDecode(aluFn))) ++:
(usingNMI.option(new NMIDecode(aluFn))) ++:
(usingConditionalZero.option(new ConditionalZeroDecode(aluFn))) ++:
Seq(new FenceIDecode(tile.dcache.flushOnFenceI, aluFn)) ++:
coreParams.haveCFlush.option(new CFlushDecode(tile.dcache.canSupportCFlushLine, aluFn)) ++:
rocketParams.haveCease.option(new CeaseDecode(aluFn)) ++:
Seq(new IDecode(aluFn))
} flatMap(_.table)
val ex_ctrl = Reg(new IntCtrlSigs(aluFn))
val mem_ctrl = Reg(new IntCtrlSigs(aluFn))
val wb_ctrl = Reg(new IntCtrlSigs(aluFn))
val ex_reg_xcpt_interrupt = Reg(Bool())
val ex_reg_valid = Reg(Bool())
val ex_reg_rvc = Reg(Bool())
val ex_reg_btb_resp = Reg(new BTBResp)
val ex_reg_xcpt = Reg(Bool())
val ex_reg_flush_pipe = Reg(Bool())
val ex_reg_load_use = Reg(Bool())
val ex_reg_cause = Reg(UInt())
val ex_reg_replay = Reg(Bool())
val ex_reg_pc = Reg(UInt())
val ex_reg_mem_size = Reg(UInt())
val ex_reg_hls = Reg(Bool())
val ex_reg_inst = Reg(Bits())
val ex_reg_raw_inst = Reg(UInt())
val ex_reg_wphit = Reg(Vec(nBreakpoints, Bool()))
val mem_reg_xcpt_interrupt = Reg(Bool())
val mem_reg_valid = Reg(Bool())
val mem_reg_rvc = Reg(Bool())
val mem_reg_btb_resp = Reg(new BTBResp)
val mem_reg_xcpt = Reg(Bool())
val mem_reg_replay = Reg(Bool())
val mem_reg_flush_pipe = Reg(Bool())
val mem_reg_cause = Reg(UInt())
val mem_reg_slow_bypass = Reg(Bool())
val mem_reg_load = Reg(Bool())
val mem_reg_store = Reg(Bool())
val mem_reg_sfence = Reg(Bool())
val mem_reg_pc = Reg(UInt())
val mem_reg_inst = Reg(Bits())
val mem_reg_mem_size = Reg(UInt())
val mem_reg_hls_or_dv = Reg(Bool())
val mem_reg_raw_inst = Reg(UInt())
val mem_reg_wdata = Reg(Bits())
val mem_reg_rs2 = Reg(Bits())
val mem_br_taken = Reg(Bool())
val take_pc_mem = Wire(Bool())
val mem_reg_wphit = Reg(Vec(nBreakpoints, Bool()))
val wb_reg_valid = Reg(Bool())
val wb_reg_xcpt = Reg(Bool())
val wb_reg_replay = Reg(Bool())
val wb_reg_flush_pipe = Reg(Bool())
val wb_reg_cause = Reg(UInt())
val wb_reg_sfence = Reg(Bool())
val wb_reg_pc = Reg(UInt())
val wb_reg_mem_size = Reg(UInt())
val wb_reg_hls_or_dv = Reg(Bool())
val wb_reg_hfence_v = Reg(Bool())
val wb_reg_hfence_g = Reg(Bool())
val wb_reg_inst = Reg(Bits())
val wb_reg_raw_inst = Reg(UInt())
val wb_reg_wdata = Reg(Bits())
val wb_reg_rs2 = Reg(Bits())
val take_pc_wb = Wire(Bool())
val wb_reg_wphit = Reg(Vec(nBreakpoints, Bool()))
val take_pc_mem_wb = take_pc_wb || take_pc_mem
val take_pc = take_pc_mem_wb
// decode stage
val ibuf = Module(new IBuf)
val id_expanded_inst = ibuf.io.inst.map(_.bits.inst)
val id_raw_inst = ibuf.io.inst.map(_.bits.raw)
val id_inst = id_expanded_inst.map(_.bits)
ibuf.io.imem <> io.imem.resp
ibuf.io.kill := take_pc
require(decodeWidth == 1 /* TODO */ && retireWidth == decodeWidth)
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)
val lgNXRegs = if (coreParams.useRVE) 4 else 5
val regAddrMask = (1 << lgNXRegs) - 1
def decodeReg(x: UInt) = (x.extract(x.getWidth-1, lgNXRegs).asBool, x(lgNXRegs-1, 0))
val (id_raddr3_illegal, id_raddr3) = decodeReg(id_expanded_inst(0).rs3)
val (id_raddr2_illegal, id_raddr2) = decodeReg(id_expanded_inst(0).rs2)
val (id_raddr1_illegal, id_raddr1) = decodeReg(id_expanded_inst(0).rs1)
val (id_waddr_illegal, id_waddr) = decodeReg(id_expanded_inst(0).rd)
val id_load_use = Wire(Bool())
val id_reg_fence = RegInit(false.B)
val id_ren = IndexedSeq(id_ctrl.rxs1, id_ctrl.rxs2)
val id_raddr = IndexedSeq(id_raddr1, id_raddr2)
val rf = new RegFile(regAddrMask, xLen)
val id_rs = id_raddr.map(rf.read _)
val ctrl_killd = Wire(Bool())
val id_npc = (ibuf.io.pc.asSInt + ImmGen(IMM_UJ, id_inst(0))).asUInt
val csr = Module(new CSRFile(perfEvents, coreParams.customCSRs.decls, tile.roccCSRs.flatten))
val id_csr_en = id_ctrl.csr.isOneOf(CSR.S, CSR.C, CSR.W)
val id_system_insn = id_ctrl.csr === CSR.I
val id_csr_ren = id_ctrl.csr.isOneOf(CSR.S, CSR.C) && id_expanded_inst(0).rs1 === 0.U
val id_csr = Mux(id_system_insn && id_ctrl.mem, CSR.N, Mux(id_csr_ren, CSR.R, id_ctrl.csr))
val id_csr_flush = id_system_insn || (id_csr_en && !id_csr_ren && csr.io.decode(0).write_flush)
val id_illegal_insn = !id_ctrl.legal ||
(id_ctrl.mul || id_ctrl.div) && !csr.io.status.isa('m'-'a') ||
id_ctrl.amo && !csr.io.status.isa('a'-'a') ||
id_ctrl.fp && (csr.io.decode(0).fp_illegal || io.fpu.illegal_rm) ||
id_ctrl.dp && !csr.io.status.isa('d'-'a') ||
ibuf.io.inst(0).bits.rvc && !csr.io.status.isa('c'-'a') ||
id_raddr2_illegal && id_ctrl.rxs2 ||
id_raddr1_illegal && id_ctrl.rxs1 ||
id_waddr_illegal && id_ctrl.wxd ||
id_ctrl.rocc && csr.io.decode(0).rocc_illegal ||
id_csr_en && (csr.io.decode(0).read_illegal || !id_csr_ren && csr.io.decode(0).write_illegal) ||
!ibuf.io.inst(0).bits.rvc && (id_system_insn && csr.io.decode(0).system_illegal)
val id_virtual_insn = id_ctrl.legal &&
((id_csr_en && !(!id_csr_ren && csr.io.decode(0).write_illegal) && csr.io.decode(0).virtual_access_illegal) ||
(!ibuf.io.inst(0).bits.rvc && id_system_insn && csr.io.decode(0).virtual_system_illegal))
// stall decode for fences (now, for AMO.rl; later, for AMO.aq and FENCE)
val id_amo_aq = id_inst(0)(26)
val id_amo_rl = id_inst(0)(25)
val id_fence_pred = id_inst(0)(27,24)
val id_fence_succ = id_inst(0)(23,20)
val id_fence_next = id_ctrl.fence || id_ctrl.amo && id_amo_aq
val id_mem_busy = !io.dmem.ordered || io.dmem.req.valid
when (!id_mem_busy) { id_reg_fence := false.B }
val id_rocc_busy = usingRoCC.B &&
(io.rocc.busy || ex_reg_valid && ex_ctrl.rocc ||
mem_reg_valid && mem_ctrl.rocc || wb_reg_valid && wb_ctrl.rocc)
val id_do_fence = WireDefault(id_rocc_busy && id_ctrl.fence ||
id_mem_busy && (id_ctrl.amo && id_amo_rl || id_ctrl.fence_i || id_reg_fence && (id_ctrl.mem || id_ctrl.rocc)))
val bpu = Module(new BreakpointUnit(nBreakpoints))
bpu.io.status := csr.io.status
bpu.io.bp := csr.io.bp
bpu.io.pc := ibuf.io.pc
bpu.io.ea := mem_reg_wdata
bpu.io.mcontext := csr.io.mcontext
bpu.io.scontext := csr.io.scontext
val id_xcpt0 = ibuf.io.inst(0).bits.xcpt0
val id_xcpt1 = ibuf.io.inst(0).bits.xcpt1
val (id_xcpt, id_cause) = checkExceptions(List(
(csr.io.interrupt, csr.io.interrupt_cause),
(bpu.io.debug_if, CSR.debugTriggerCause.U),
(bpu.io.xcpt_if, Causes.breakpoint.U),
(id_xcpt0.pf.inst, Causes.fetch_page_fault.U),
(id_xcpt0.gf.inst, Causes.fetch_guest_page_fault.U),
(id_xcpt0.ae.inst, Causes.fetch_access.U),
(id_xcpt1.pf.inst, Causes.fetch_page_fault.U),
(id_xcpt1.gf.inst, Causes.fetch_guest_page_fault.U),
(id_xcpt1.ae.inst, Causes.fetch_access.U),
(id_virtual_insn, Causes.virtual_instruction.U),
(id_illegal_insn, Causes.illegal_instruction.U)))
val idCoverCauses = List(
(CSR.debugTriggerCause, "DEBUG_TRIGGER"),
(Causes.breakpoint, "BREAKPOINT"),
(Causes.fetch_access, "FETCH_ACCESS"),
(Causes.illegal_instruction, "ILLEGAL_INSTRUCTION")
) ++ (if (usingVM) List(
(Causes.fetch_page_fault, "FETCH_PAGE_FAULT")
) else Nil)
coverExceptions(id_xcpt, id_cause, "DECODE", idCoverCauses)
val dcache_bypass_data =
if (fastLoadByte) io.dmem.resp.bits.data(xLen-1, 0)
else if (fastLoadWord) io.dmem.resp.bits.data_word_bypass(xLen-1, 0)
else wb_reg_wdata
// detect bypass opportunities
val ex_waddr = ex_reg_inst(11,7) & regAddrMask.U
val mem_waddr = mem_reg_inst(11,7) & regAddrMask.U
val wb_waddr = wb_reg_inst(11,7) & regAddrMask.U
val bypass_sources = IndexedSeq(
(true.B, 0.U, 0.U), // treat reading x0 as a bypass
(ex_reg_valid && ex_ctrl.wxd, ex_waddr, mem_reg_wdata),
(mem_reg_valid && mem_ctrl.wxd && !mem_ctrl.mem, mem_waddr, wb_reg_wdata),
(mem_reg_valid && mem_ctrl.wxd, mem_waddr, dcache_bypass_data))
val id_bypass_src = id_raddr.map(raddr => bypass_sources.map(s => s._1 && s._2 === raddr))
// execute stage
val bypass_mux = bypass_sources.map(_._3)
val ex_reg_rs_bypass = Reg(Vec(id_raddr.size, Bool()))
val ex_reg_rs_lsb = Reg(Vec(id_raddr.size, UInt(log2Ceil(bypass_sources.size).W)))
val ex_reg_rs_msb = Reg(Vec(id_raddr.size, UInt()))
val ex_rs = for (i <- 0 until id_raddr.size)
yield Mux(ex_reg_rs_bypass(i), bypass_mux(ex_reg_rs_lsb(i)), Cat(ex_reg_rs_msb(i), ex_reg_rs_lsb(i)))
val ex_imm = ImmGen(ex_ctrl.sel_imm, ex_reg_inst)
val ex_op1 = MuxLookup(ex_ctrl.sel_alu1, 0.S, Seq(
A1_RS1 -> ex_rs(0).asSInt,
A1_PC -> ex_reg_pc.asSInt))
val ex_op2 = MuxLookup(ex_ctrl.sel_alu2, 0.S, Seq(
A2_RS2 -> ex_rs(1).asSInt,
A2_IMM -> ex_imm,
A2_SIZE -> Mux(ex_reg_rvc, 2.S, 4.S)))
val alu = Module(aluFn match {
case _: ALUFN => new ALU
})
alu.io.dw := ex_ctrl.alu_dw
alu.io.fn := ex_ctrl.alu_fn
alu.io.in2 := ex_op2.asUInt
alu.io.in1 := ex_op1.asUInt
// multiplier and divider
val div = Module(new MulDiv(if (pipelinedMul) mulDivParams.copy(mulUnroll = 0) else mulDivParams, width = xLen, aluFn = aluFn))
div.io.req.valid := ex_reg_valid && ex_ctrl.div
div.io.req.bits.dw := ex_ctrl.alu_dw
div.io.req.bits.fn := ex_ctrl.alu_fn
div.io.req.bits.in1 := ex_rs(0)
div.io.req.bits.in2 := ex_rs(1)
div.io.req.bits.tag := ex_waddr
val mul = pipelinedMul.option {
val m = Module(new PipelinedMultiplier(xLen, 2, aluFn = aluFn))
m.io.req.valid := ex_reg_valid && ex_ctrl.mul
m.io.req.bits := div.io.req.bits
m
}
ex_reg_valid := !ctrl_killd
ex_reg_replay := !take_pc && ibuf.io.inst(0).valid && ibuf.io.inst(0).bits.replay
ex_reg_xcpt := !ctrl_killd && id_xcpt
ex_reg_xcpt_interrupt := !take_pc && ibuf.io.inst(0).valid && csr.io.interrupt
when (!ctrl_killd) {
ex_ctrl := id_ctrl
ex_reg_rvc := ibuf.io.inst(0).bits.rvc
ex_ctrl.csr := id_csr
when (id_ctrl.fence && id_fence_succ === 0.U) { id_reg_pause := true.B }
when (id_fence_next) { id_reg_fence := true.B }
when (id_xcpt) { // pass PC down ALU writeback pipeline for badaddr
ex_ctrl.alu_fn := aluFn.FN_ADD
ex_ctrl.alu_dw := DW_XPR
ex_ctrl.sel_alu1 := A1_RS1 // badaddr := instruction
ex_ctrl.sel_alu2 := A2_ZERO
when (id_xcpt1.asUInt.orR) { // badaddr := PC+2
ex_ctrl.sel_alu1 := A1_PC
ex_ctrl.sel_alu2 := A2_SIZE
ex_reg_rvc := true.B
}
when (bpu.io.xcpt_if || id_xcpt0.asUInt.orR) { // badaddr := PC
ex_ctrl.sel_alu1 := A1_PC
ex_ctrl.sel_alu2 := A2_ZERO
}
}
ex_reg_flush_pipe := id_ctrl.fence_i || id_csr_flush
ex_reg_load_use := id_load_use
ex_reg_hls := usingHypervisor.B && id_system_insn && id_ctrl.mem_cmd.isOneOf(M_XRD, M_XWR, M_HLVX)
ex_reg_mem_size := Mux(usingHypervisor.B && id_system_insn, id_inst(0)(27, 26), id_inst(0)(13, 12))
when (id_ctrl.mem_cmd.isOneOf(M_SFENCE, M_HFENCEV, M_HFENCEG, M_FLUSH_ALL)) {
ex_reg_mem_size := Cat(id_raddr2 =/= 0.U, id_raddr1 =/= 0.U)
}
when (id_ctrl.mem_cmd === M_SFENCE && csr.io.status.v) {
ex_ctrl.mem_cmd := M_HFENCEV
}
if (tile.dcache.flushOnFenceI) {
when (id_ctrl.fence_i) {
ex_reg_mem_size := 0.U
}
}
for (i <- 0 until id_raddr.size) {
val do_bypass = id_bypass_src(i).reduce(_||_)
val bypass_src = PriorityEncoder(id_bypass_src(i))
ex_reg_rs_bypass(i) := do_bypass
ex_reg_rs_lsb(i) := bypass_src
when (id_ren(i) && !do_bypass) {
ex_reg_rs_lsb(i) := id_rs(i)(log2Ceil(bypass_sources.size)-1, 0)
ex_reg_rs_msb(i) := id_rs(i) >> log2Ceil(bypass_sources.size)
}
}
when (id_illegal_insn || id_virtual_insn) {
val inst = Mux(ibuf.io.inst(0).bits.rvc, id_raw_inst(0)(15, 0), id_raw_inst(0))
ex_reg_rs_bypass(0) := false.B
ex_reg_rs_lsb(0) := inst(log2Ceil(bypass_sources.size)-1, 0)
ex_reg_rs_msb(0) := inst >> log2Ceil(bypass_sources.size)
}
}
when (!ctrl_killd || csr.io.interrupt || ibuf.io.inst(0).bits.replay) {
ex_reg_cause := id_cause
ex_reg_inst := id_inst(0)
ex_reg_raw_inst := id_raw_inst(0)
ex_reg_pc := ibuf.io.pc
ex_reg_btb_resp := ibuf.io.btb_resp
ex_reg_wphit := bpu.io.bpwatch.map { bpw => bpw.ivalid(0) }
}
// replay inst in ex stage?
val ex_pc_valid = ex_reg_valid || ex_reg_replay || ex_reg_xcpt_interrupt
val wb_dcache_miss = wb_ctrl.mem && !io.dmem.resp.valid
val replay_ex_structural = ex_ctrl.mem && !io.dmem.req.ready ||
ex_ctrl.div && !div.io.req.ready
val replay_ex_load_use = wb_dcache_miss && ex_reg_load_use
val replay_ex = ex_reg_replay || (ex_reg_valid && (replay_ex_structural || replay_ex_load_use))
val ctrl_killx = take_pc_mem_wb || replay_ex || !ex_reg_valid
// detect 2-cycle load-use delay for LB/LH/SC
val ex_slow_bypass = ex_ctrl.mem_cmd === M_XSC || ex_reg_mem_size < 2.U
val ex_sfence = usingVM.B && ex_ctrl.mem && (ex_ctrl.mem_cmd === M_SFENCE || ex_ctrl.mem_cmd === M_HFENCEV || ex_ctrl.mem_cmd === M_HFENCEG)
val (ex_xcpt, ex_cause) = checkExceptions(List(
(ex_reg_xcpt_interrupt || ex_reg_xcpt, ex_reg_cause)))
val exCoverCauses = idCoverCauses
coverExceptions(ex_xcpt, ex_cause, "EXECUTE", exCoverCauses)
// memory stage
val mem_pc_valid = mem_reg_valid || mem_reg_replay || mem_reg_xcpt_interrupt
val mem_br_target = mem_reg_pc.asSInt +
Mux(mem_ctrl.branch && mem_br_taken, ImmGen(IMM_SB, mem_reg_inst),
Mux(mem_ctrl.jal, ImmGen(IMM_UJ, mem_reg_inst),
Mux(mem_reg_rvc, 2.S, 4.S)))
val mem_npc = (Mux(mem_ctrl.jalr || mem_reg_sfence, encodeVirtualAddress(mem_reg_wdata, mem_reg_wdata).asSInt, mem_br_target) & (-2).S).asUInt
val mem_wrong_npc =
Mux(ex_pc_valid, mem_npc =/= ex_reg_pc,
Mux(ibuf.io.inst(0).valid || ibuf.io.imem.valid, mem_npc =/= ibuf.io.pc, true.B))
val mem_npc_misaligned = !csr.io.status.isa('c'-'a') && mem_npc(1) && !mem_reg_sfence
val mem_int_wdata = Mux(!mem_reg_xcpt && (mem_ctrl.jalr ^ mem_npc_misaligned), mem_br_target, mem_reg_wdata.asSInt).asUInt
val mem_cfi = mem_ctrl.branch || mem_ctrl.jalr || mem_ctrl.jal
val mem_cfi_taken = (mem_ctrl.branch && mem_br_taken) || mem_ctrl.jalr || mem_ctrl.jal
val mem_direction_misprediction = mem_ctrl.branch && mem_br_taken =/= (usingBTB.B && mem_reg_btb_resp.taken)
val mem_misprediction = if (usingBTB) mem_wrong_npc else mem_cfi_taken
take_pc_mem := mem_reg_valid && !mem_reg_xcpt && (mem_misprediction || mem_reg_sfence)
mem_reg_valid := !ctrl_killx
mem_reg_replay := !take_pc_mem_wb && replay_ex
mem_reg_xcpt := !ctrl_killx && ex_xcpt
mem_reg_xcpt_interrupt := !take_pc_mem_wb && ex_reg_xcpt_interrupt
// on pipeline flushes, cause mem_npc to hold the sequential npc, which
// will drive the W-stage npc mux
when (mem_reg_valid && mem_reg_flush_pipe) {
mem_reg_sfence := false.B
}.elsewhen (ex_pc_valid) {
mem_ctrl := ex_ctrl
mem_reg_rvc := ex_reg_rvc
mem_reg_load := ex_ctrl.mem && isRead(ex_ctrl.mem_cmd)
mem_reg_store := ex_ctrl.mem && isWrite(ex_ctrl.mem_cmd)
mem_reg_sfence := ex_sfence
mem_reg_btb_resp := ex_reg_btb_resp
mem_reg_flush_pipe := ex_reg_flush_pipe
mem_reg_slow_bypass := ex_slow_bypass
mem_reg_wphit := ex_reg_wphit
mem_reg_cause := ex_cause
mem_reg_inst := ex_reg_inst
mem_reg_raw_inst := ex_reg_raw_inst
mem_reg_mem_size := ex_reg_mem_size
mem_reg_hls_or_dv := io.dmem.req.bits.dv
mem_reg_pc := ex_reg_pc
// IDecode ensured they are 1H
mem_reg_wdata := alu.io.out
mem_br_taken := alu.io.cmp_out
when (ex_ctrl.rxs2 && (ex_ctrl.mem || ex_ctrl.rocc || ex_sfence)) {
val size = Mux(ex_ctrl.rocc, log2Ceil(xLen/8).U, ex_reg_mem_size)
mem_reg_rs2 := new StoreGen(size, 0.U, ex_rs(1), coreDataBytes).data
}
when (ex_ctrl.jalr && csr.io.status.debug) {
// flush I$ on D-mode JALR to effect uncached fetch without D$ flush
mem_ctrl.fence_i := true.B
mem_reg_flush_pipe := true.B
}
}
val mem_breakpoint = (mem_reg_load && bpu.io.xcpt_ld) || (mem_reg_store && bpu.io.xcpt_st)
val mem_debug_breakpoint = (mem_reg_load && bpu.io.debug_ld) || (mem_reg_store && bpu.io.debug_st)
val (mem_ldst_xcpt, mem_ldst_cause) = checkExceptions(List(
(mem_debug_breakpoint, CSR.debugTriggerCause.U),
(mem_breakpoint, Causes.breakpoint.U)))
val (mem_xcpt, mem_cause) = checkExceptions(List(
(mem_reg_xcpt_interrupt || mem_reg_xcpt, mem_reg_cause),
(mem_reg_valid && mem_npc_misaligned, Causes.misaligned_fetch.U),
(mem_reg_valid && mem_ldst_xcpt, mem_ldst_cause)))
val memCoverCauses = (exCoverCauses ++ List(
(CSR.debugTriggerCause, "DEBUG_TRIGGER"),
(Causes.breakpoint, "BREAKPOINT"),
(Causes.misaligned_fetch, "MISALIGNED_FETCH")
)).distinct
coverExceptions(mem_xcpt, mem_cause, "MEMORY", memCoverCauses)
val dcache_kill_mem = mem_reg_valid && mem_ctrl.wxd && io.dmem.replay_next // structural hazard on writeback port
val fpu_kill_mem = mem_reg_valid && mem_ctrl.fp && io.fpu.nack_mem
val replay_mem = dcache_kill_mem || mem_reg_replay || fpu_kill_mem
val killm_common = dcache_kill_mem || take_pc_wb || mem_reg_xcpt || !mem_reg_valid
div.io.kill := killm_common && RegNext(div.io.req.fire)
val ctrl_killm = killm_common || mem_xcpt || fpu_kill_mem
// writeback stage
wb_reg_valid := !ctrl_killm
wb_reg_replay := replay_mem && !take_pc_wb
wb_reg_xcpt := mem_xcpt && !take_pc_wb
wb_reg_flush_pipe := !ctrl_killm && mem_reg_flush_pipe
when (mem_pc_valid) {
wb_ctrl := mem_ctrl
wb_reg_sfence := mem_reg_sfence
wb_reg_wdata := Mux(!mem_reg_xcpt && mem_ctrl.fp && mem_ctrl.wxd, io.fpu.toint_data, mem_int_wdata)
when (mem_ctrl.rocc || mem_reg_sfence) {
wb_reg_rs2 := mem_reg_rs2
}
wb_reg_cause := mem_cause
wb_reg_inst := mem_reg_inst
wb_reg_raw_inst := mem_reg_raw_inst
wb_reg_mem_size := mem_reg_mem_size
wb_reg_hls_or_dv := mem_reg_hls_or_dv
wb_reg_hfence_v := mem_ctrl.mem_cmd === M_HFENCEV
wb_reg_hfence_g := mem_ctrl.mem_cmd === M_HFENCEG
wb_reg_pc := mem_reg_pc
wb_reg_wphit := mem_reg_wphit | bpu.io.bpwatch.map { bpw => (bpw.rvalid(0) && mem_reg_load) || (bpw.wvalid(0) && mem_reg_store) }
}
val (wb_xcpt, wb_cause) = checkExceptions(List(
(wb_reg_xcpt, wb_reg_cause),
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.pf.st, Causes.store_page_fault.U),
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.pf.ld, Causes.load_page_fault.U),
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.gf.st, Causes.store_guest_page_fault.U),
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.gf.ld, Causes.load_guest_page_fault.U),
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.ae.st, Causes.store_access.U),
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.ae.ld, Causes.load_access.U),
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.ma.st, Causes.misaligned_store.U),
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.ma.ld, Causes.misaligned_load.U)
))
val wbCoverCauses = List(
(Causes.misaligned_store, "MISALIGNED_STORE"),
(Causes.misaligned_load, "MISALIGNED_LOAD"),
(Causes.store_access, "STORE_ACCESS"),
(Causes.load_access, "LOAD_ACCESS")
) ++ (if(usingVM) List(
(Causes.store_page_fault, "STORE_PAGE_FAULT"),
(Causes.load_page_fault, "LOAD_PAGE_FAULT")
) else Nil) ++ (if (usingHypervisor) List(
(Causes.store_guest_page_fault, "STORE_GUEST_PAGE_FAULT"),
(Causes.load_guest_page_fault, "LOAD_GUEST_PAGE_FAULT"),
) else Nil)
coverExceptions(wb_xcpt, wb_cause, "WRITEBACK", wbCoverCauses)
val wb_pc_valid = wb_reg_valid || wb_reg_replay || wb_reg_xcpt
val wb_wxd = wb_reg_valid && wb_ctrl.wxd
val wb_set_sboard = wb_ctrl.div || wb_dcache_miss || wb_ctrl.rocc
val replay_wb_common = io.dmem.s2_nack || wb_reg_replay
val replay_wb_rocc = wb_reg_valid && wb_ctrl.rocc && !io.rocc.cmd.ready
val replay_wb_csr: Bool = wb_reg_valid && csr.io.rw_stall
val replay_wb = replay_wb_common || replay_wb_rocc || replay_wb_csr
take_pc_wb := replay_wb || wb_xcpt || csr.io.eret || wb_reg_flush_pipe
// writeback arbitration
val dmem_resp_xpu = !io.dmem.resp.bits.tag(0).asBool
val dmem_resp_fpu = io.dmem.resp.bits.tag(0).asBool
val dmem_resp_waddr = io.dmem.resp.bits.tag(5, 1)
val dmem_resp_valid = io.dmem.resp.valid && io.dmem.resp.bits.has_data
val dmem_resp_replay = dmem_resp_valid && io.dmem.resp.bits.replay
div.io.resp.ready := !wb_wxd
val ll_wdata = WireDefault(div.io.resp.bits.data)
val ll_waddr = WireDefault(div.io.resp.bits.tag)
val ll_wen = WireDefault(div.io.resp.fire)
if (usingRoCC) {
io.rocc.resp.ready := !wb_wxd
when (io.rocc.resp.fire) {
div.io.resp.ready := false.B
ll_wdata := io.rocc.resp.bits.data
ll_waddr := io.rocc.resp.bits.rd
ll_wen := true.B
}
} else {
// tie off RoCC
io.rocc.resp.ready := false.B
io.rocc.mem.req.ready := false.B
}
// Dont care mem since not all RoCC need accessing memory
io.rocc.mem := DontCare
when (dmem_resp_replay && dmem_resp_xpu) {
div.io.resp.ready := false.B
if (usingRoCC)
io.rocc.resp.ready := false.B
ll_waddr := dmem_resp_waddr
ll_wen := true.B
}
val wb_valid = wb_reg_valid && !replay_wb && !wb_xcpt
val wb_wen = wb_valid && wb_ctrl.wxd
val rf_wen = wb_wen || ll_wen
val rf_waddr = Mux(ll_wen, ll_waddr, wb_waddr)
val rf_wdata = Mux(dmem_resp_valid && dmem_resp_xpu, io.dmem.resp.bits.data(xLen-1, 0),
Mux(ll_wen, ll_wdata,
Mux(wb_ctrl.csr =/= CSR.N, csr.io.rw.rdata,
Mux(wb_ctrl.mul, mul.map(_.io.resp.bits.data).getOrElse(wb_reg_wdata),
wb_reg_wdata))))
when (rf_wen) { rf.write(rf_waddr, rf_wdata) }
// hook up control/status regfile
csr.io.ungated_clock := clock
csr.io.decode(0).inst := id_inst(0)
csr.io.exception := wb_xcpt
csr.io.cause := wb_cause
csr.io.retire := wb_valid
csr.io.inst(0) := (if (usingCompressed) Cat(Mux(wb_reg_raw_inst(1, 0).andR, wb_reg_inst >> 16, 0.U), wb_reg_raw_inst(15, 0)) else wb_reg_inst)
csr.io.interrupts := io.interrupts
csr.io.hartid := io.hartid
io.fpu.fcsr_rm := csr.io.fcsr_rm
csr.io.fcsr_flags := io.fpu.fcsr_flags
io.fpu.time := csr.io.time(31,0)
io.fpu.hartid := io.hartid
csr.io.rocc_interrupt := io.rocc.interrupt
csr.io.pc := wb_reg_pc
val tval_dmem_addr = !wb_reg_xcpt
val tval_any_addr = tval_dmem_addr ||
wb_reg_cause.isOneOf(Causes.breakpoint.U, Causes.fetch_access.U, Causes.fetch_page_fault.U, Causes.fetch_guest_page_fault.U)
val tval_inst = wb_reg_cause === Causes.illegal_instruction.U
val tval_valid = wb_xcpt && (tval_any_addr || tval_inst)
csr.io.gva := wb_xcpt && (tval_any_addr && csr.io.status.v || tval_dmem_addr && wb_reg_hls_or_dv)
csr.io.tval := Mux(tval_valid, encodeVirtualAddress(wb_reg_wdata, wb_reg_wdata), 0.U)
csr.io.htval := {
val htval_valid_imem = wb_reg_xcpt && wb_reg_cause === Causes.fetch_guest_page_fault.U
val htval_imem = Mux(htval_valid_imem, io.imem.gpa.bits, 0.U)
assert(!htval_valid_imem || io.imem.gpa.valid)
val htval_valid_dmem = wb_xcpt && tval_dmem_addr && io.dmem.s2_xcpt.gf.asUInt.orR && !io.dmem.s2_xcpt.pf.asUInt.orR
val htval_dmem = Mux(htval_valid_dmem, io.dmem.s2_gpa, 0.U)
(htval_dmem | htval_imem) >> hypervisorExtraAddrBits
}
io.ptw.ptbr := csr.io.ptbr
io.ptw.hgatp := csr.io.hgatp
io.ptw.vsatp := csr.io.vsatp
(io.ptw.customCSRs.csrs zip csr.io.customCSRs).map { case (lhs, rhs) => lhs <> rhs }
io.ptw.status := csr.io.status
io.ptw.hstatus := csr.io.hstatus
io.ptw.gstatus := csr.io.gstatus
io.ptw.pmp := csr.io.pmp
csr.io.rw.addr := wb_reg_inst(31,20)
csr.io.rw.cmd := CSR.maskCmd(wb_reg_valid, wb_ctrl.csr)
csr.io.rw.wdata := wb_reg_wdata
io.rocc.csrs <> csr.io.roccCSRs
io.trace.time := csr.io.time
io.trace.insns := csr.io.trace
if (rocketParams.debugROB) {
val csr_trace_with_wdata = WireInit(csr.io.trace(0))
csr_trace_with_wdata.wdata.get := rf_wdata
DebugROB.pushTrace(clock, reset,
io.hartid, csr_trace_with_wdata,
(wb_ctrl.wfd || (wb_ctrl.wxd && wb_waddr =/= 0.U)) && !csr.io.trace(0).exception,
wb_ctrl.wxd && wb_wen && !wb_set_sboard,
wb_waddr + Mux(wb_ctrl.wfd, 32.U, 0.U))
io.trace.insns(0) := DebugROB.popTrace(clock, reset, io.hartid)
DebugROB.pushWb(clock, reset, io.hartid, ll_wen, rf_waddr, rf_wdata)
} else {
io.trace.insns := csr.io.trace
}
for (((iobpw, wphit), bp) <- io.bpwatch zip wb_reg_wphit zip csr.io.bp) {
iobpw.valid(0) := wphit
iobpw.action := bp.control.action
// tie off bpwatch valids
iobpw.rvalid.foreach(_ := false.B)
iobpw.wvalid.foreach(_ := false.B)
iobpw.ivalid.foreach(_ := false.B)
}
val hazard_targets = Seq((id_ctrl.rxs1 && id_raddr1 =/= 0.U, id_raddr1),
(id_ctrl.rxs2 && id_raddr2 =/= 0.U, id_raddr2),
(id_ctrl.wxd && id_waddr =/= 0.U, id_waddr))
val fp_hazard_targets = Seq((io.fpu.dec.ren1, id_raddr1),
(io.fpu.dec.ren2, id_raddr2),
(io.fpu.dec.ren3, id_raddr3),
(io.fpu.dec.wen, id_waddr))
val sboard = new Scoreboard(32, true)
sboard.clear(ll_wen, ll_waddr)
def id_sboard_clear_bypass(r: UInt) = {
// ll_waddr arrives late when D$ has ECC, so reshuffle the hazard check
if (!tileParams.dcache.get.dataECC.isDefined) ll_wen && ll_waddr === r
else div.io.resp.fire && div.io.resp.bits.tag === r || dmem_resp_replay && dmem_resp_xpu && dmem_resp_waddr === r
}
val id_sboard_hazard = checkHazards(hazard_targets, rd => sboard.read(rd) && !id_sboard_clear_bypass(rd))
sboard.set(wb_set_sboard && wb_wen, wb_waddr)
// stall for RAW/WAW hazards on CSRs, loads, AMOs, and mul/div in execute stage.
val ex_cannot_bypass = ex_ctrl.csr =/= CSR.N || ex_ctrl.jalr || ex_ctrl.mem || ex_ctrl.mul || ex_ctrl.div || ex_ctrl.fp || ex_ctrl.rocc
val data_hazard_ex = ex_ctrl.wxd && checkHazards(hazard_targets, _ === ex_waddr)
val fp_data_hazard_ex = id_ctrl.fp && ex_ctrl.wfd && checkHazards(fp_hazard_targets, _ === ex_waddr)
val id_ex_hazard = ex_reg_valid && (data_hazard_ex && ex_cannot_bypass || fp_data_hazard_ex)
// stall for RAW/WAW hazards on CSRs, LB/LH, and mul/div in memory stage.
val mem_mem_cmd_bh =
if (fastLoadWord) (!fastLoadByte).B && mem_reg_slow_bypass
else true.B
val mem_cannot_bypass = mem_ctrl.csr =/= CSR.N || mem_ctrl.mem && mem_mem_cmd_bh || mem_ctrl.mul || mem_ctrl.div || mem_ctrl.fp || mem_ctrl.rocc
val data_hazard_mem = mem_ctrl.wxd && checkHazards(hazard_targets, _ === mem_waddr)
val fp_data_hazard_mem = id_ctrl.fp && mem_ctrl.wfd && checkHazards(fp_hazard_targets, _ === mem_waddr)
val id_mem_hazard = mem_reg_valid && (data_hazard_mem && mem_cannot_bypass || fp_data_hazard_mem)
id_load_use := mem_reg_valid && data_hazard_mem && mem_ctrl.mem
// stall for RAW/WAW hazards on load/AMO misses and mul/div in writeback.
val data_hazard_wb = wb_ctrl.wxd && checkHazards(hazard_targets, _ === wb_waddr)
val fp_data_hazard_wb = id_ctrl.fp && wb_ctrl.wfd && checkHazards(fp_hazard_targets, _ === wb_waddr)
val id_wb_hazard = wb_reg_valid && (data_hazard_wb && wb_set_sboard || fp_data_hazard_wb)
val id_stall_fpu = if (usingFPU) {
val fp_sboard = new Scoreboard(32)
fp_sboard.set((wb_dcache_miss && wb_ctrl.wfd || io.fpu.sboard_set) && wb_valid, wb_waddr)
fp_sboard.clear(dmem_resp_replay && dmem_resp_fpu, dmem_resp_waddr)
fp_sboard.clear(io.fpu.sboard_clr, io.fpu.sboard_clra)
checkHazards(fp_hazard_targets, fp_sboard.read _)
} else false.B
val dcache_blocked = {
// speculate that a blocked D$ will unblock the cycle after a Grant
val blocked = Reg(Bool())
blocked := !io.dmem.req.ready && io.dmem.clock_enabled && !io.dmem.perf.grant && (blocked || io.dmem.req.valid || io.dmem.s2_nack)
blocked && !io.dmem.perf.grant
}
val rocc_blocked = Reg(Bool())
rocc_blocked := !wb_xcpt && !io.rocc.cmd.ready && (io.rocc.cmd.valid || rocc_blocked)
val ctrl_stalld =
id_ex_hazard || id_mem_hazard || id_wb_hazard || id_sboard_hazard ||
csr.io.singleStep && (ex_reg_valid || mem_reg_valid || wb_reg_valid) ||
id_csr_en && csr.io.decode(0).fp_csr && !io.fpu.fcsr_rdy ||
id_ctrl.fp && id_stall_fpu ||
id_ctrl.mem && dcache_blocked || // reduce activity during D$ misses
id_ctrl.rocc && rocc_blocked || // reduce activity while RoCC is busy
id_ctrl.div && (!(div.io.req.ready || (div.io.resp.valid && !wb_wxd)) || div.io.req.valid) || // reduce odds of replay
!clock_en ||
id_do_fence ||
csr.io.csr_stall ||
id_reg_pause ||
io.traceStall
ctrl_killd := !ibuf.io.inst(0).valid || ibuf.io.inst(0).bits.replay || take_pc_mem_wb || ctrl_stalld || csr.io.interrupt
io.imem.req.valid := take_pc
io.imem.req.bits.speculative := !take_pc_wb
io.imem.req.bits.pc :=
Mux(wb_xcpt || csr.io.eret, csr.io.evec, // exception or [m|s]ret
Mux(replay_wb, wb_reg_pc, // replay
mem_npc)) // flush or branch misprediction
io.imem.flush_icache := wb_reg_valid && wb_ctrl.fence_i && !io.dmem.s2_nack
io.imem.might_request := {
imem_might_request_reg := ex_pc_valid || mem_pc_valid || io.ptw.customCSRs.disableICacheClockGate
imem_might_request_reg
}
io.imem.progress := RegNext(wb_reg_valid && !replay_wb_common)
io.imem.sfence.valid := wb_reg_valid && wb_reg_sfence
io.imem.sfence.bits.rs1 := wb_reg_mem_size(0)
io.imem.sfence.bits.rs2 := wb_reg_mem_size(1)
io.imem.sfence.bits.addr := wb_reg_wdata
io.imem.sfence.bits.asid := wb_reg_rs2
io.imem.sfence.bits.hv := wb_reg_hfence_v
io.imem.sfence.bits.hg := wb_reg_hfence_g
io.ptw.sfence := io.imem.sfence
ibuf.io.inst(0).ready := !ctrl_stalld
io.imem.btb_update.valid := mem_reg_valid && !take_pc_wb && mem_wrong_npc && (!mem_cfi || mem_cfi_taken)
io.imem.btb_update.bits.isValid := mem_cfi
io.imem.btb_update.bits.cfiType :=
Mux((mem_ctrl.jal || mem_ctrl.jalr) && mem_waddr(0), CFIType.call,
Mux(mem_ctrl.jalr && (mem_reg_inst(19,15) & regAddrMask.U) === BitPat("b00?01"), CFIType.ret,
Mux(mem_ctrl.jal || mem_ctrl.jalr, CFIType.jump,
CFIType.branch)))
io.imem.btb_update.bits.target := io.imem.req.bits.pc
io.imem.btb_update.bits.br_pc := (if (usingCompressed) mem_reg_pc + Mux(mem_reg_rvc, 0.U, 2.U) else mem_reg_pc)
io.imem.btb_update.bits.pc := ~(~io.imem.btb_update.bits.br_pc | (coreInstBytes*fetchWidth-1).U)
io.imem.btb_update.bits.prediction := mem_reg_btb_resp
io.imem.btb_update.bits.taken := DontCare
io.imem.bht_update.valid := mem_reg_valid && !take_pc_wb
io.imem.bht_update.bits.pc := io.imem.btb_update.bits.pc
io.imem.bht_update.bits.taken := mem_br_taken
io.imem.bht_update.bits.mispredict := mem_wrong_npc
io.imem.bht_update.bits.branch := mem_ctrl.branch
io.imem.bht_update.bits.prediction := mem_reg_btb_resp.bht
// Connect RAS in Frontend
io.imem.ras_update := DontCare
io.fpu.valid := !ctrl_killd && id_ctrl.fp
io.fpu.killx := ctrl_killx
io.fpu.killm := killm_common
io.fpu.inst := id_inst(0)
io.fpu.fromint_data := ex_rs(0)
io.fpu.dmem_resp_val := dmem_resp_valid && dmem_resp_fpu
io.fpu.dmem_resp_data := (if (minFLen == 32) io.dmem.resp.bits.data_word_bypass else io.dmem.resp.bits.data)
io.fpu.dmem_resp_type := io.dmem.resp.bits.size
io.fpu.dmem_resp_tag := dmem_resp_waddr
io.fpu.keep_clock_enabled := io.ptw.customCSRs.disableCoreClockGate
io.dmem.req.valid := ex_reg_valid && ex_ctrl.mem
val ex_dcache_tag = Cat(ex_waddr, ex_ctrl.fp)
require(coreParams.dcacheReqTagBits >= ex_dcache_tag.getWidth)
io.dmem.req.bits.tag := ex_dcache_tag
io.dmem.req.bits.cmd := ex_ctrl.mem_cmd
io.dmem.req.bits.size := ex_reg_mem_size
io.dmem.req.bits.signed := !Mux(ex_reg_hls, ex_reg_inst(20), ex_reg_inst(14))
io.dmem.req.bits.phys := false.B
io.dmem.req.bits.addr := encodeVirtualAddress(ex_rs(0), alu.io.adder_out)
io.dmem.req.bits.idx.foreach(_ := io.dmem.req.bits.addr)
io.dmem.req.bits.dprv := Mux(ex_reg_hls, csr.io.hstatus.spvp, csr.io.status.dprv)
io.dmem.req.bits.dv := ex_reg_hls || csr.io.status.dv
io.dmem.req.bits.no_alloc := DontCare
io.dmem.req.bits.no_xcpt := DontCare
io.dmem.req.bits.data := DontCare
io.dmem.req.bits.mask := DontCare
io.dmem.s1_data.data := (if (fLen == 0) mem_reg_rs2 else Mux(mem_ctrl.fp, Fill((xLen max fLen) / fLen, io.fpu.store_data), mem_reg_rs2))
io.dmem.s1_data.mask := DontCare
io.dmem.s1_kill := killm_common || mem_ldst_xcpt || fpu_kill_mem
io.dmem.s2_kill := false.B
// don't let D$ go to sleep if we're probably going to use it soon
io.dmem.keep_clock_enabled := ibuf.io.inst(0).valid && id_ctrl.mem && !csr.io.csr_stall
io.rocc.cmd.valid := wb_reg_valid && wb_ctrl.rocc && !replay_wb_common
io.rocc.exception := wb_xcpt && csr.io.status.xs.orR
io.rocc.cmd.bits.status := csr.io.status
io.rocc.cmd.bits.inst := wb_reg_inst.asTypeOf(new RoCCInstruction())
io.rocc.cmd.bits.rs1 := wb_reg_wdata
io.rocc.cmd.bits.rs2 := wb_reg_rs2
// gate the clock
val unpause = csr.io.time(rocketParams.lgPauseCycles-1, 0) === 0.U || csr.io.inhibit_cycle || io.dmem.perf.release || take_pc
when (unpause) { id_reg_pause := false.B }
io.cease := csr.io.status.cease && !clock_en_reg
io.wfi := csr.io.status.wfi
if (rocketParams.clockGate) {
long_latency_stall := csr.io.csr_stall || io.dmem.perf.blocked || id_reg_pause && !unpause
clock_en := clock_en_reg || ex_pc_valid || (!long_latency_stall && io.imem.resp.valid)
clock_en_reg :=
ex_pc_valid || mem_pc_valid || wb_pc_valid || // instruction in flight
io.ptw.customCSRs.disableCoreClockGate || // chicken bit
!div.io.req.ready || // mul/div in flight
usingFPU.B && !io.fpu.fcsr_rdy || // long-latency FPU in flight
io.dmem.replay_next || // long-latency load replaying
(!long_latency_stall && (ibuf.io.inst(0).valid || io.imem.resp.valid)) // instruction pending
assert(!(ex_pc_valid || mem_pc_valid || wb_pc_valid) || clock_en)
}
// evaluate performance counters
val icache_blocked = !(io.imem.resp.valid || RegNext(io.imem.resp.valid))
csr.io.counters foreach { c => c.inc := RegNext(perfEvents.evaluate(c.eventSel)) }
val coreMonitorBundle = Wire(new CoreMonitorBundle(xLen, fLen))
coreMonitorBundle.clock := clock
coreMonitorBundle.reset := reset
coreMonitorBundle.hartid := io.hartid
coreMonitorBundle.timer := csr.io.time(31,0)
coreMonitorBundle.valid := csr.io.trace(0).valid && !csr.io.trace(0).exception
coreMonitorBundle.pc := csr.io.trace(0).iaddr(vaddrBitsExtended-1, 0).sextTo(xLen)
coreMonitorBundle.wrenx := wb_wen && !wb_set_sboard
coreMonitorBundle.wrenf := false.B
coreMonitorBundle.wrdst := wb_waddr
coreMonitorBundle.wrdata := rf_wdata
coreMonitorBundle.rd0src := wb_reg_inst(19,15)
coreMonitorBundle.rd0val := RegNext(RegNext(ex_rs(0)))
coreMonitorBundle.rd1src := wb_reg_inst(24,20)
coreMonitorBundle.rd1val := RegNext(RegNext(ex_rs(1)))
coreMonitorBundle.inst := csr.io.trace(0).insn
coreMonitorBundle.excpt := csr.io.trace(0).exception
coreMonitorBundle.priv_mode := csr.io.trace(0).priv
if (enableCommitLog) {
val t = csr.io.trace(0)
val rd = wb_waddr
val wfd = wb_ctrl.wfd
val wxd = wb_ctrl.wxd
val has_data = wb_wen && !wb_set_sboard
when (t.valid && !t.exception) {
when (wfd) {
printf ("%d 0x%x (0x%x) f%d p%d 0xXXXXXXXXXXXXXXXX\n", t.priv, t.iaddr, t.insn, rd, rd+32.U)
}
.elsewhen (wxd && rd =/= 0.U && has_data) {
printf ("%d 0x%x (0x%x) x%d 0x%x\n", t.priv, t.iaddr, t.insn, rd, rf_wdata)
}
.elsewhen (wxd && rd =/= 0.U && !has_data) {
printf ("%d 0x%x (0x%x) x%d p%d 0xXXXXXXXXXXXXXXXX\n", t.priv, t.iaddr, t.insn, rd, rd)
}
.otherwise {
printf ("%d 0x%x (0x%x)\n", t.priv, t.iaddr, t.insn)
}
}
when (ll_wen && rf_waddr =/= 0.U) {
printf ("x%d p%d 0x%x\n", rf_waddr, rf_waddr, rf_wdata)
}
}
else {
when (csr.io.trace(0).valid) {
printf("C%d: %d [%d] pc=[%x] W[r%d=%x][%d] R[r%d=%x] R[r%d=%x] inst=[%x] DASM(%x)\n",
io.hartid, coreMonitorBundle.timer, coreMonitorBundle.valid,
coreMonitorBundle.pc,
Mux(wb_ctrl.wxd || wb_ctrl.wfd, coreMonitorBundle.wrdst, 0.U),
Mux(coreMonitorBundle.wrenx, coreMonitorBundle.wrdata, 0.U),
coreMonitorBundle.wrenx,