riscv/rocket-chip
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improve htif<->pcr interface

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This commit is contained in:
Andrew Waterman 2012-03-24 16:23:29 -07:00
parent 54fa6f660d
commit 3a487ac89b
2 changed files with 53 additions and 50 deletions
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19
rocket/src/main/scala/dpath_util.scala
View File

@ -120,14 +120,14 @@ class rocketDpathPCR extends Component
val rdata = Wire() { Bits() };
val ren = io.r.en || io.host.pcr_ren
val raddr = Mux(io.r.en, io.r.addr, io.host.pcr_addr)
io.host.pcr_rdata := rdata
val raddr = Mux(io.r.en, io.r.addr, io.host.pcr_req.bits.addr)
io.host.pcr_rep.valid := io.host.pcr_req.valid && !io.r.en && !io.host.pcr_req.bits.rw
io.host.pcr_rep.bits := rdata
val wen = io.w.en || io.host.pcr_wen
val waddr = Mux(io.w.en, io.w.addr, io.host.pcr_addr)
val wdata = Mux(io.w.en, io.w.data, io.host.pcr_wdata)
io.host.pcr_rdy := Mux(io.host.pcr_wen, !io.w.en, !io.r.en)
val wen = io.w.en || io.host.pcr_req.valid && io.host.pcr_req.bits.rw
val waddr = Mux(io.w.en, io.w.addr, io.host.pcr_req.bits.addr)
val wdata = Mux(io.w.en, io.w.data, io.host.pcr_req.bits.data)
io.host.pcr_req.ready := Mux(io.host.pcr_req.bits.rw, !io.w.en, !io.r.en)
io.ptbr_wen := reg_status_vm.toBool && wen && (waddr === PCR_PTBR);
io.status := Cat(reg_status_im, Bits(0,7), reg_status_vm, reg_status_sx, reg_status_ux, reg_status_s, reg_status_ps, reg_status_ec, reg_status_ev, reg_status_ef, reg_status_et);
@ -203,10 +203,8 @@ class rocketDpathPCR extends Component
when (waddr === PCR_VECBANK) { reg_vecbank:= wdata(7,0) }
}
rdata := Bits(0, 64)
when (ren) {
rdata := io.status // raddr === PCR_STATUS
switch (raddr) {
is (PCR_STATUS) { rdata := io.status }
is (PCR_EPC) { rdata := Cat(Fill(64-VADDR_BITS-1, reg_epc(VADDR_BITS)), reg_epc); }
is (PCR_BADVADDR) { rdata := Cat(Fill(64-VADDR_BITS-1, reg_badvaddr(VADDR_BITS)), reg_badvaddr); }
is (PCR_EVEC) { rdata := Cat(Fill(64-VADDR_BITS, reg_ebase(VADDR_BITS-1)), reg_ebase); }
@ -224,7 +222,6 @@ class rocketDpathPCR extends Component
is (PCR_VECCFG) { rdata := Cat(Bits(0, 40), io.vec_nfregs, io.vec_nxregs, io.vec_appvl) }
}
}
}
class ioReadPort extends Bundle()
{

52
rocket/src/main/scala/htif.scala
View File

@ -10,15 +10,18 @@ class ioHost(w: Int, view: List[String] = null) extends Bundle(view)
val out = new ioDecoupled()(Bits(width = w))
}
class PCRReq extends Bundle
{
val rw = Bool()
val addr = Bits(width = 5)
val data = Bits(width = 64)
}
class ioHTIF extends Bundle
{
val reset = Bool(INPUT)
val pcr_wen = Bool(INPUT)
val pcr_ren = Bool(INPUT)
val pcr_rdy = Bool(OUTPUT)
val pcr_addr = Bits(5, INPUT)
val pcr_wdata = Bits(64, INPUT)
val pcr_rdata = Bits(64, OUTPUT)
val pcr_req = (new ioDecoupled) { new PCRReq }.flip
val pcr_rep = (new ioPipe) { Bits(width = 64) }
}
class rocketHTIF(w: Int, ncores: Int) extends Component with FourStateCoherence
@ -170,27 +173,30 @@ class rocketHTIF(w: Int, ncores: Int) extends Component with FourStateCoherence
pcr_done := Bool(false)
val pcr_mux = (new Mux1H(ncores)) { Bits(width = 64) }
for (i <- 0 until ncores) {
val me = pcr_coreid === UFix(i)
io.cpu(i).pcr_wen := Reg(state === state_pcr && cmd === cmd_writecr && me, resetVal = Bool(false))
io.cpu(i).pcr_addr := Reg(pcr_addr)
io.cpu(i).pcr_wdata := Reg(pcr_wdata)
val my_reset = Reg(resetVal = Bool(true))
when (io.cpu(i).pcr_wen && io.cpu(i).pcr_rdy) {
when (io.cpu(i).pcr_addr === PCR_RESET) { my_reset := io.cpu(i).pcr_wdata(0) }
pcr_done := Bool(true)
}
io.cpu(i).reset := my_reset
io.cpu(i).pcr_ren := Reg(state === state_pcr && cmd === cmd_readcr && me, resetVal = Bool(false))
val rdata = Reg() { Bits() }
when (io.cpu(i).pcr_ren && io.cpu(i).pcr_rdy) {
rdata := io.cpu(i).pcr_rdata
when (io.cpu(i).pcr_addr === PCR_RESET) { rdata := my_reset }
val cpu = io.cpu(i)
val me = pcr_coreid === UFix(i)
cpu.pcr_req.valid := state === state_pcr && me
cpu.pcr_req.bits.rw := cmd === cmd_writecr
cpu.pcr_req.bits.addr := pcr_addr
cpu.pcr_req.bits.data := pcr_wdata
cpu.reset := my_reset
when (cpu.pcr_req.valid && cpu.pcr_req.ready && cpu.pcr_req.bits.rw) {
pcr_done := Bool(true)
when (cpu.pcr_req.bits.addr === PCR_RESET) {
my_reset := cpu.pcr_req.bits.data(0)
}
pcr_mux.io.sel(i) := Reg(me)
pcr_mux.io.in(i) := rdata
}
when (cpu.pcr_rep.valid) {
pcr_done := Bool(true)
rdata := cpu.pcr_rep.bits
}
pcr_mux.io.sel(i) := me
pcr_mux.io.in(i) := Mux(pcr_addr === PCR_RESET, my_reset, rdata)
}
val tx_cmd = Mux(nack, cmd_nack, cmd_ack)