riscv/rocket-chip
1
0
Fork 0
Code Releases Activity

WIP on priv spec v1.9

Browse Source
This commit is contained in:
Andrew Waterman 2016-03-02 23:29:58 -08:00
parent 091782ad27
commit bc15e8649e
10 changed files with 316 additions and 300 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
rocket/src/main/scala/consts.scala
View File

@ -46,10 +46,4 @@ trait ScalarOpConstants {
val DW_32 = N val DW_32 = N
val DW_64 = Y val DW_64 = Y
val DW_XPR = Y val DW_XPR = Y
val SZ_PRV = 2
val PRV_U = 0
val PRV_S = 1
val PRV_H = 2
val PRV_M = 3
} }

406
rocket/src/main/scala/csr.scala
View File

@ -10,40 +10,37 @@ import uncore._
import scala.math._ import scala.math._
class MStatus extends Bundle { class MStatus extends Bundle {
val prv = UInt(width = PRV.SZ) // not truly part of mstatus, but convenient
val sd = Bool() val sd = Bool()
val zero2 = UInt(width = 31) val zero3 = UInt(width = 31)
val sd_rv32 = UInt(width = 1) val sd_rv32 = Bool()
val zero1 = UInt(width = 9) val zero2 = UInt(width = 2)
val vm = UInt(width = 5) val vm = UInt(width = 5)
val zero1 = UInt(width = 5)
val pum = Bool()
val mprv = Bool() val mprv = Bool()
val xs = UInt(width = 2) val xs = UInt(width = 2)
val fs = UInt(width = 2) val fs = UInt(width = 2)
val prv3 = UInt(width = 2) val mpp = UInt(width = 2)
val ie3 = Bool() val hpp = UInt(width = 2)
val prv2 = UInt(width = 2) val spp = UInt(width = 1)
val ie2 = Bool() val mpie = Bool()
val prv1 = UInt(width = 2) val hpie = Bool()
val ie1 = Bool() val spie = Bool()
val prv = UInt(width = 2) val upie = Bool()
val ie = Bool() val mie = Bool()
} val hie = Bool()
val sie = Bool()
class SStatus extends Bundle { val uie = Bool()
val sd = Bool()
val zero4 = UInt(width = 31)
val sd_rv32 = UInt(width = 1)
val zero3 = UInt(width = 14)
val mprv = Bool()
val xs = UInt(width = 2)
val fs = UInt(width = 2)
val zero2 = UInt(width = 7)
val ps = Bool()
val pie = Bool()
val zero1 = UInt(width = 2)
val ie = Bool()
} }
class MIP extends Bundle { class MIP extends Bundle {
val host = Bool()
val rocc = Bool()
val mdip = Bool()
val hdip = Bool()
val sdip = Bool()
val udip = Bool()
val mtip = Bool() val mtip = Bool()
val htip = Bool() val htip = Bool()
val stip = Bool() val stip = Bool()
@ -54,6 +51,15 @@ class MIP extends Bundle {
val usip = Bool() val usip = Bool()
} }
object PRV
{
val SZ = 2
val U = 0
val S = 1
val H = 2
val M = 3
}
object CSR object CSR
{ {
// commands // commands
@ -82,6 +88,7 @@ class CSRFileIO(implicit p: Parameters) extends CoreBundle {
val csr_xcpt = Bool(OUTPUT) val csr_xcpt = Bool(OUTPUT)
val eret = Bool(OUTPUT) val eret = Bool(OUTPUT)
val prv = UInt(OUTPUT, PRV.SZ)
val status = new MStatus().asOutput val status = new MStatus().asOutput
val ptbr = UInt(OUTPUT, paddrBits) val ptbr = UInt(OUTPUT, paddrBits)
val evec = UInt(OUTPUT, vaddrBitsExtended) val evec = UInt(OUTPUT, vaddrBitsExtended)
@ -104,13 +111,44 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
{ {
val io = new CSRFileIO val io = new CSRFileIO
val reg_mstatus = Reg(new MStatus) val reset_mstatus = Wire(init=new MStatus().fromBits(0))
val reg_mie = Reg(init=new MIP().fromBits(0)) reset_mstatus.mpp := PRV.M
reset_mstatus.prv := PRV.M
val reg_mstatus = Reg(init=reset_mstatus)
val (supported_interrupts, delegable_interrupts) = {
val sup = Wire(init=new MIP().fromBits(0))
sup.ssip := Bool(p(UseVM))
sup.msip := true
sup.stip := Bool(p(UseVM))
sup.mtip := true
sup.rocc := usingRoCC
sup.host := true
val del = Wire(init=sup)
del.msip := false
del.mtip := false
del.mdip := false
(sup.toBits, del.toBits)
}
val delegable_exceptions = UInt(Seq(
Causes.misaligned_fetch,
Causes.fault_fetch,
Causes.breakpoint,
Causes.fault_load,
Causes.fault_store,
Causes.user_ecall).map(1 << _).sum)
val reg_mie = Reg(init=UInt(0, xLen))
val reg_mideleg = Reg(init=UInt(0, xLen))
val reg_medeleg = Reg(init=UInt(0, xLen))
val reg_mip = Reg(init=new MIP().fromBits(0)) val reg_mip = Reg(init=new MIP().fromBits(0))
val reg_mepc = Reg(UInt(width = vaddrBitsExtended)) val reg_mepc = Reg(UInt(width = vaddrBitsExtended))
val reg_mcause = Reg(Bits(width = xLen)) val reg_mcause = Reg(Bits(width = xLen))
val reg_mbadaddr = Reg(UInt(width = vaddrBitsExtended)) val reg_mbadaddr = Reg(UInt(width = vaddrBitsExtended))
val reg_mscratch = Reg(Bits(width = xLen)) val reg_mscratch = Reg(Bits(width = xLen))
val reg_mtvec = Reg(init=UInt(p(MtvecInit), paddrBits min xLen))
val reg_sepc = Reg(UInt(width = vaddrBitsExtended)) val reg_sepc = Reg(UInt(width = vaddrBitsExtended))
val reg_scause = Reg(Bits(width = xLen)) val reg_scause = Reg(Bits(width = xLen))
@ -118,7 +156,7 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
val reg_sscratch = Reg(Bits(width = xLen)) val reg_sscratch = Reg(Bits(width = xLen))
val reg_stvec = Reg(UInt(width = vaddrBits)) val reg_stvec = Reg(UInt(width = vaddrBits))
val reg_mtimecmp = Reg(Bits(width = xLen)) val reg_mtimecmp = Reg(Bits(width = xLen))
val reg_sptbr = Reg(UInt(width = paddrBits)) val reg_sptbr = Reg(UInt(width = ppnBits))
val reg_wfi = Reg(init=Bool(false)) val reg_wfi = Reg(init=Bool(false))
val reg_tohost = Reg(init=Bits(0, xLen)) val reg_tohost = Reg(init=Bits(0, xLen))
@ -126,31 +164,22 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
val reg_stats = Reg(init=Bool(false)) val reg_stats = Reg(init=Bool(false))
val reg_time = Reg(UInt(width = xLen)) val reg_time = Reg(UInt(width = xLen))
val reg_instret = WideCounter(xLen, io.retire) val reg_instret = WideCounter(xLen, io.retire)
val reg_cycle = if (enableCommitLog) { reg_instret } else { WideCounter(xLen) } val reg_cycle: UInt = if (enableCommitLog) { reg_instret } else { WideCounter(xLen) }
val reg_uarch_counters = io.uarch_counters.map(WideCounter(xLen, _)) val reg_uarch_counters = io.uarch_counters.map(WideCounter(xLen, _))
val reg_fflags = Reg(UInt(width = 5)) val reg_fflags = Reg(UInt(width = 5))
val reg_frm = Reg(UInt(width = 3)) val reg_frm = Reg(UInt(width = 3))
val irq_rocc = Bool(usingRoCC) && io.rocc.interrupt val mip = Wire(init=reg_mip)
mip.host := (reg_fromhost =/= 0)
mip.rocc := io.rocc.interrupt
val read_mip = mip.toBits & supported_interrupts
io.interrupt_cause := 0 val pending_interrupts = read_mip & reg_mie
io.interrupt := io.interrupt_cause(xLen-1) val m_interrupts = Mux(reg_mstatus.prv < PRV.M || (reg_mstatus.prv === PRV.M && reg_mstatus.mie), pending_interrupts & ~reg_mideleg, UInt(0))
val some_interrupt_pending = Wire(init=Bool(false)) val s_interrupts = Mux(reg_mstatus.prv < PRV.S || (reg_mstatus.prv === PRV.S && reg_mstatus.sie), pending_interrupts & reg_mideleg, UInt(0))
def checkInterrupt(max_priv: UInt, cond: Bool, num: Int) = { val all_interrupts = m_interrupts | s_interrupts
when (cond && (reg_mstatus.prv < max_priv || reg_mstatus.prv === max_priv && reg_mstatus.ie)) { io.interrupt := all_interrupts.orR
io.interrupt_cause := UInt((BigInt(1) << (xLen-1)) + num) io.interrupt_cause := (io.interrupt << (xLen-1)) + PriorityEncoder(all_interrupts)
}
when (cond && reg_mstatus.prv <= max_priv) {
some_interrupt_pending := true
}
}
checkInterrupt(PRV_S, reg_mie.ssip && reg_mip.ssip, 0)
checkInterrupt(PRV_M, reg_mie.msip && reg_mip.msip, 0)
checkInterrupt(PRV_S, reg_mie.stip && reg_mip.stip, 1)
checkInterrupt(PRV_M, reg_mie.mtip && reg_mip.mtip, 1)
checkInterrupt(PRV_M, reg_fromhost =/= 0, 2)
checkInterrupt(PRV_M, irq_rocc, 3)
val system_insn = io.rw.cmd === CSR.I val system_insn = io.rw.cmd === CSR.I
val cpu_ren = io.rw.cmd =/= CSR.N && !system_insn val cpu_ren = io.rw.cmd =/= CSR.N && !system_insn
@ -175,38 +204,34 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
io.host.debug_stats_csr := reg_stats // direct export up the hierarchy io.host.debug_stats_csr := reg_stats // direct export up the hierarchy
val read_time = if (usingPerfCounters) reg_time else (reg_cycle: UInt)
val read_mstatus = io.status.toBits
val isa_string = "IMA" + val isa_string = "IMA" +
(if (usingVM) "S" else "") + (if (usingVM) "S" else "") +
(if (usingFPU) "FD" else "") + (if (usingFPU) "FDG" else "") +
(if (usingRoCC) "X" else "") (if (usingRoCC) "X" else "")
val cpuid = ((if (xLen == 32) BigInt(0) else BigInt(2)) << (xLen-2)) | val isa = ((if (xLen == 32) BigInt(0) else BigInt(2)) << (xLen-2)) |
isa_string.map(x => 1 << (x - 'A')).reduce(_|_) isa_string.map(x => 1 << (x - 'A')).reduce(_|_)
val impid = 1 val read_mstatus = io.status.toBits()(xLen-1,0)
val reg_mtvec = Reg(init = UInt(mtvecInit, xLen))
val read_mapping = collection.mutable.LinkedHashMap[Int,Bits]( val read_mapping = collection.mutable.LinkedHashMap[Int,Bits](
CSRs.fflags -> (if (usingFPU) reg_fflags else UInt(0)), CSRs.mimpid -> UInt(0),
CSRs.frm -> (if (usingFPU) reg_frm else UInt(0)), CSRs.marchid -> UInt(0),
CSRs.fcsr -> (if (usingFPU) Cat(reg_frm, reg_fflags) else UInt(0)), CSRs.mvendorid -> UInt(0),
CSRs.cycle -> reg_cycle, CSRs.mtime -> reg_time,
CSRs.cyclew -> reg_cycle, CSRs.mcycle -> reg_cycle,
CSRs.time -> read_time, CSRs.minstret -> reg_instret,
CSRs.timew -> read_time, CSRs.mucounteren -> UInt(0),
CSRs.stime -> read_time, CSRs.mutime_delta -> UInt(0),
CSRs.stimew -> read_time, CSRs.mucycle_delta -> UInt(0),
CSRs.mtime -> read_time, CSRs.muinstret_delta -> UInt(0),
CSRs.mcpuid -> UInt(cpuid), CSRs.misa -> UInt(isa),
CSRs.mimpid -> UInt(impid),
CSRs.mstatus -> read_mstatus, CSRs.mstatus -> read_mstatus,
CSRs.mtdeleg -> UInt(0),
CSRs.mreset -> UInt(0),
CSRs.mtvec -> reg_mtvec, CSRs.mtvec -> reg_mtvec,
CSRs.miobase -> UInt(p(junctions.MMIOBase)), CSRs.mcfgaddr -> UInt(p(junctions.MMIOBase)),
CSRs.mipi -> UInt(0), CSRs.mipi -> reg_mip.msip,
CSRs.mip -> reg_mip.toBits, CSRs.mip -> read_mip,
CSRs.mie -> reg_mie.toBits, CSRs.mie -> reg_mie,
CSRs.mideleg -> reg_mideleg,
CSRs.medeleg -> reg_medeleg,
CSRs.mscratch -> reg_mscratch, CSRs.mscratch -> reg_mscratch,
CSRs.mepc -> reg_mepc.sextTo(xLen), CSRs.mepc -> reg_mepc.sextTo(xLen),
CSRs.mbadaddr -> reg_mbadaddr.sextTo(xLen), CSRs.mbadaddr -> reg_mbadaddr.sextTo(xLen),
@ -217,30 +242,26 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
CSRs.mtohost -> reg_tohost, CSRs.mtohost -> reg_tohost,
CSRs.mfromhost -> reg_fromhost) CSRs.mfromhost -> reg_fromhost)
if (usingPerfCounters) { if (usingFPU) {
read_mapping += CSRs.instret -> reg_instret read_mapping += CSRs.fflags -> reg_fflags
read_mapping += CSRs.instretw -> reg_instret read_mapping += CSRs.frm -> reg_frm
read_mapping += CSRs.fcsr -> Cat(reg_frm, reg_fflags)
for (i <- 0 until reg_uarch_counters.size)
read_mapping += (CSRs.uarch0 + i) -> reg_uarch_counters(i)
} }
if (usingVM) { if (usingVM) {
val read_sstatus = Wire(init=new SStatus().fromBits(read_mstatus)) val read_sie = reg_mie & reg_mideleg
read_sstatus.zero1 := 0 val read_sip = read_mip & reg_mideleg
read_sstatus.zero2 := 0 val read_sstatus = Wire(init=io.status)
read_sstatus.zero3 := 0 read_sstatus.vm := 0
read_sstatus.zero4 := 0 read_sstatus.mprv := 0
read_sstatus.mpp := 0
read_sstatus.hpp := 0
read_sstatus.mpie := 0
read_sstatus.hpie := 0
read_sstatus.mie := 0
read_sstatus.hie := 0
val read_sip = Wire(init=new MIP().fromBits(0)) read_mapping += CSRs.sstatus -> (read_sstatus.toBits())(xLen-1,0)
read_sip.ssip := reg_mip.ssip
read_sip.stip := reg_mip.stip
val read_sie = Wire(init=new MIP().fromBits(0))
read_sie.ssip := reg_mie.ssip
read_sie.stip := reg_mie.stip
read_mapping += CSRs.sstatus -> read_sstatus.toBits
read_mapping += CSRs.sip -> read_sip.toBits read_mapping += CSRs.sip -> read_sip.toBits
read_mapping += CSRs.sie -> read_sie.toBits read_mapping += CSRs.sie -> read_sie.toBits
read_mapping += CSRs.sscratch -> reg_sscratch read_mapping += CSRs.sscratch -> reg_sscratch
@ -250,10 +271,15 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
read_mapping += CSRs.sasid -> UInt(0) read_mapping += CSRs.sasid -> UInt(0)
read_mapping += CSRs.sepc -> reg_sepc.sextTo(xLen) read_mapping += CSRs.sepc -> reg_sepc.sextTo(xLen)
read_mapping += CSRs.stvec -> reg_stvec.sextTo(xLen) read_mapping += CSRs.stvec -> reg_stvec.sextTo(xLen)
read_mapping += CSRs.mscounteren -> UInt(0)
read_mapping += CSRs.mstime_delta -> UInt(0)
read_mapping += CSRs.mscycle_delta -> UInt(0)
read_mapping += CSRs.msinstret_delta -> UInt(0)
} }
for (i <- 0 until nCustomMrwCsrs) { for (i <- 0 until nCustomMrwCsrs) {
val addr = CSRs.mrwbase + i val addr = 0xff0 + i
require(addr < (1 << CSR.ADDRSZ))
require(!read_mapping.contains(addr), "custom MRW CSR address " + i + " is already in use") require(!read_mapping.contains(addr), "custom MRW CSR address " + i + " is already in use")
read_mapping += addr -> io.custom_mrw_csrs(i) read_mapping += addr -> io.custom_mrw_csrs(i)
} }
@ -278,14 +304,13 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
Mux(io.rw.cmd === CSR.S, io.rw.rdata | io.rw.wdata, Mux(io.rw.cmd === CSR.S, io.rw.rdata | io.rw.wdata,
host_csr_bits.data))) host_csr_bits.data)))
val opcode = io.rw.addr val do_system_insn = priv_sufficient && system_insn
val insn_call = !opcode(8) && !opcode(0) && system_insn val opcode = UInt(1) << io.rw.addr(2,0)
val insn_break = !opcode(8) && opcode(0) && system_insn val insn_call = do_system_insn && opcode(0)
val insn_ret = opcode(8) && !opcode(1) && !opcode(0) && system_insn && priv_sufficient val insn_break = do_system_insn && opcode(1)
val insn_sfence_vm = opcode(8) && !opcode(1) && opcode(0) && system_insn && priv_sufficient val insn_ret = do_system_insn && opcode(2)
val maybe_insn_redirect_trap = opcode(2) && system_insn val insn_sfence_vm = do_system_insn && opcode(4)
val insn_redirect_trap = maybe_insn_redirect_trap && priv_sufficient val insn_wfi = do_system_insn && opcode(5)
val insn_wfi = opcode(8) && opcode(1) && !opcode(0) && system_insn && priv_sufficient
val csr_xcpt = (cpu_wen && read_only) || val csr_xcpt = (cpu_wen && read_only) ||
(cpu_ren && (!priv_sufficient || !addr_valid || fp_csr && !io.status.fs.orR)) || (cpu_ren && (!priv_sufficient || !addr_valid || fp_csr && !io.status.fs.orR)) ||
@ -293,67 +318,77 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
insn_call || insn_break insn_call || insn_break
when (insn_wfi) { reg_wfi := true } when (insn_wfi) { reg_wfi := true }
when (some_interrupt_pending) { reg_wfi := false } when (read_mip.orR) { reg_wfi := false }
val cause =
Mux(!csr_xcpt, io.cause,
Mux(insn_call, reg_mstatus.prv + Causes.user_ecall,
Mux[UInt](insn_break, Causes.breakpoint, Causes.illegal_instruction)))
val cause_lsbs = cause(log2Up(xLen)-1,0)
val can_delegate = Bool(p(UseVM)) && reg_mstatus.prv < PRV.M
val delegate = can_delegate && Mux(cause(xLen-1), reg_mideleg(cause_lsbs), reg_medeleg(cause_lsbs))
val tvec = Mux(delegate, reg_stvec.sextTo(vaddrBitsExtended), reg_mtvec)
val epc = Mux(can_delegate, reg_sepc, reg_mepc)
io.fatc := insn_sfence_vm io.fatc := insn_sfence_vm
io.evec := Mux(io.exception || csr_xcpt, (reg_mstatus.prv << 6) + reg_mtvec, io.evec := Mux(io.exception || csr_xcpt, tvec, epc)
Mux(maybe_insn_redirect_trap, reg_stvec.sextTo(vaddrBitsExtended),
Mux(reg_mstatus.prv(1) || Bool(!p(UseVM)), reg_mepc, reg_sepc)))
io.ptbr := reg_sptbr io.ptbr := reg_sptbr
io.csr_xcpt := csr_xcpt io.csr_xcpt := csr_xcpt
io.eret := insn_ret || insn_redirect_trap io.eret := insn_ret
io.status := reg_mstatus io.status := reg_mstatus
io.status.fs := Fill(2, reg_mstatus.fs.orR) // either off or dirty (no clean/initial support yet)
io.status.xs := Fill(2, reg_mstatus.xs.orR) // either off or dirty (no clean/initial support yet)
io.status.sd := io.status.fs.andR || io.status.xs.andR io.status.sd := io.status.fs.andR || io.status.xs.andR
if (xLen == 32) if (xLen == 32)
io.status.sd_rv32 := io.status.sd io.status.sd_rv32 := io.status.sd
when (io.exception || csr_xcpt) { when (io.exception || csr_xcpt) {
reg_mstatus.ie := false val ldst_badaddr = {
reg_mstatus.prv := PRV_M
reg_mstatus.mprv := false
reg_mstatus.prv1 := reg_mstatus.prv
reg_mstatus.ie1 := reg_mstatus.ie
reg_mstatus.prv2 := reg_mstatus.prv1
reg_mstatus.ie2 := reg_mstatus.ie1
reg_mepc := ~(~io.pc | (coreInstBytes-1))
reg_mcause := io.cause
when (csr_xcpt) {
reg_mcause := Causes.illegal_instruction
when (insn_break) { reg_mcause := Causes.breakpoint }
when (insn_call) { reg_mcause := reg_mstatus.prv + Causes.user_ecall }
}
reg_mbadaddr := io.pc
when (io.cause === Causes.fault_load || io.cause === Causes.misaligned_load ||
io.cause === Causes.fault_store || io.cause === Causes.misaligned_store) {
val (upper, lower) = Split(io.rw.wdata, vaddrBits) val (upper, lower) = Split(io.rw.wdata, vaddrBits)
val sign = Mux(lower.toSInt < SInt(0), upper.andR, upper.orR) val sign = Mux(lower.toSInt < SInt(0), upper.andR, upper.orR)
reg_mbadaddr := Cat(sign, lower) Cat(sign, lower)
}
val ldst =
cause === Causes.fault_load || cause === Causes.misaligned_load ||
cause === Causes.fault_store || cause === Causes.misaligned_store
val badaddr = Mux(ldst, ldst_badaddr, io.pc)
val epc = ~(~io.pc | (coreInstBytes-1))
val pie = read_mstatus(reg_mstatus.prv)
when (delegate) {
reg_sepc := epc
reg_scause := cause
reg_sbadaddr := badaddr
reg_mstatus.spie := pie
reg_mstatus.spp := reg_mstatus.prv
reg_mstatus.sie := false
reg_mstatus.prv := PRV.S
}.otherwise {
reg_mepc := epc
reg_mcause := cause
reg_mbadaddr := badaddr
reg_mstatus.mpie := pie
reg_mstatus.mpp := reg_mstatus.prv
reg_mstatus.mie := false
reg_mstatus.prv := PRV.M
} }
} }
when (insn_ret) { when (insn_ret) {
reg_mstatus.ie := reg_mstatus.ie1 when (can_delegate) {
reg_mstatus.prv := reg_mstatus.prv1 when (reg_mstatus.spp.toBool) { reg_mstatus.sie := reg_mstatus.spie }
reg_mstatus.prv1 := reg_mstatus.prv2 reg_mstatus.spie := false
reg_mstatus.ie1 := reg_mstatus.ie2 reg_mstatus.spp := PRV.U
reg_mstatus.prv2 := PRV_U reg_mstatus.prv := reg_mstatus.spp
reg_mstatus.ie2 := true }.otherwise {
} when (reg_mstatus.mpp(1)) { reg_mstatus.mie := reg_mstatus.mpie }
when (reg_mstatus.mpp(0)) { reg_mstatus.sie := reg_mstatus.mpie }
when (insn_redirect_trap) { reg_mstatus.mpie := false
reg_mstatus.prv := PRV_S reg_mstatus.mpp := PRV.U
reg_sbadaddr := reg_mbadaddr reg_mstatus.prv := reg_mstatus.mpp
reg_scause := reg_mcause }
reg_sepc := reg_mepc
} }
assert(PopCount(insn_ret :: insn_redirect_trap :: io.exception :: csr_xcpt :: Nil) <= 1, "these conditions must be mutually exclusive") assert(PopCount(insn_ret :: io.exception :: csr_xcpt :: Nil) <= 1, "these conditions must be mutually exclusive")
when (read_time >= reg_mtimecmp) { when (reg_time >= reg_mtimecmp) {
reg_mip.mtip := true reg_mip.mtip := true
} }
@ -372,17 +407,18 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
when (wen) { when (wen) {
when (decoded_addr(CSRs.mstatus)) { when (decoded_addr(CSRs.mstatus)) {
val new_mstatus = new MStatus().fromBits(wdata) val new_mstatus = new MStatus().fromBits(wdata)
reg_mstatus.ie := new_mstatus.ie reg_mstatus.mie := new_mstatus.mie
reg_mstatus.ie1 := new_mstatus.ie1 reg_mstatus.mpie := new_mstatus.mpie
val supportedModes = Vec((PRV_M :: PRV_U :: (if (usingVM) List(PRV_S) else Nil)).map(UInt(_))) val supportedModes = Vec((PRV.M :: PRV.U :: (if (usingVM) List(PRV.S) else Nil)).map(UInt(_)))
if (supportedModes.size > 1) { if (supportedModes.size > 1) {
reg_mstatus.mprv := new_mstatus.mprv reg_mstatus.mprv := new_mstatus.mprv
when (supportedModes contains new_mstatus.prv) { reg_mstatus.prv := new_mstatus.prv } when (supportedModes contains new_mstatus.mpp) { reg_mstatus.mpp := new_mstatus.mpp }
when (supportedModes contains new_mstatus.prv1) { reg_mstatus.prv1 := new_mstatus.prv1 }
if (supportedModes.size > 2) { if (supportedModes.size > 2) {
when (supportedModes contains new_mstatus.prv2) { reg_mstatus.prv2 := new_mstatus.prv2 } reg_mstatus.pum := new_mstatus.pum
reg_mstatus.ie2 := new_mstatus.ie2 reg_mstatus.spp := new_mstatus.spp
reg_mstatus.spie := new_mstatus.spie
reg_mstatus.sie := new_mstatus.sie
} }
} }
@ -391,8 +427,8 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
when (new_mstatus.vm === 0) { reg_mstatus.vm := 0 } when (new_mstatus.vm === 0) { reg_mstatus.vm := 0 }
when (new_mstatus.vm === vm_on) { reg_mstatus.vm := vm_on } when (new_mstatus.vm === vm_on) { reg_mstatus.vm := vm_on }
} }
if (usingVM || usingFPU) reg_mstatus.fs := new_mstatus.fs if (usingVM || usingFPU) reg_mstatus.fs := Fill(2, new_mstatus.fs.orR)
if (usingRoCC) reg_mstatus.xs := new_mstatus.xs if (usingRoCC) reg_mstatus.xs := Fill(2, new_mstatus.xs.orR)
} }
when (decoded_addr(CSRs.mip)) { when (decoded_addr(CSRs.mip)) {
val new_mip = new MIP().fromBits(wdata) val new_mip = new MIP().fromBits(wdata)
@ -405,76 +441,48 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
when (decoded_addr(CSRs.mipi)) { when (decoded_addr(CSRs.mipi)) {
reg_mip.msip := wdata(0) reg_mip.msip := wdata(0)
} }
when (decoded_addr(CSRs.mie)) { when (decoded_addr(CSRs.mie)) { reg_mie := wdata & supported_interrupts }
val new_mie = new MIP().fromBits(wdata)
if (usingVM) {
reg_mie.ssip := new_mie.ssip
reg_mie.stip := new_mie.stip
}
reg_mie.msip := new_mie.msip
reg_mie.mtip := new_mie.mtip
}
when (decoded_addr(CSRs.fflags)) { reg_fflags := wdata } when (decoded_addr(CSRs.fflags)) { reg_fflags := wdata }
when (decoded_addr(CSRs.frm)) { reg_frm := wdata } when (decoded_addr(CSRs.frm)) { reg_frm := wdata }
when (decoded_addr(CSRs.fcsr)) { reg_fflags := wdata; reg_frm := wdata >> reg_fflags.getWidth } when (decoded_addr(CSRs.fcsr)) { reg_fflags := wdata; reg_frm := wdata >> reg_fflags.getWidth }
when (decoded_addr(CSRs.mepc)) { reg_mepc := ~(~wdata | (coreInstBytes-1)) } when (decoded_addr(CSRs.mepc)) { reg_mepc := ~(~wdata | (coreInstBytes-1)) }
when (decoded_addr(CSRs.mscratch)) { reg_mscratch := wdata } when (decoded_addr(CSRs.mscratch)) { reg_mscratch := wdata }
if (p(MtvecWritable))
when (decoded_addr(CSRs.mtvec)) { reg_mtvec := wdata >> 2 << 2 }
when (decoded_addr(CSRs.mcause)) { reg_mcause := wdata & UInt((BigInt(1) << (xLen-1)) + 31) /* only implement 5 LSBs and MSB */ } when (decoded_addr(CSRs.mcause)) { reg_mcause := wdata & UInt((BigInt(1) << (xLen-1)) + 31) /* only implement 5 LSBs and MSB */ }
when (decoded_addr(CSRs.mbadaddr)) { reg_mbadaddr := wdata(vaddrBitsExtended-1,0) } when (decoded_addr(CSRs.mbadaddr)) { reg_mbadaddr := wdata(vaddrBitsExtended-1,0) }
if (usingPerfCounters)
when (decoded_addr(CSRs.instretw)) { reg_instret := wdata }
when (decoded_addr(CSRs.mtimecmp)) { reg_mtimecmp := wdata; reg_mip.mtip := false } when (decoded_addr(CSRs.mtimecmp)) { reg_mtimecmp := wdata; reg_mip.mtip := false }
when (decoded_addr(CSRs.mtime)) { reg_time := wdata } when (decoded_addr(CSRs.mtime)) { reg_time := wdata }
when (decoded_addr(CSRs.mfromhost)){ when (reg_fromhost === UInt(0) || !host_csr_req_fire) { reg_fromhost := wdata } } when (decoded_addr(CSRs.mfromhost)){ when (reg_fromhost === UInt(0) || !host_csr_req_fire) { reg_fromhost := wdata } }
when (decoded_addr(CSRs.mtohost)) { when (reg_tohost === UInt(0) || host_csr_req_fire) { reg_tohost := wdata } } when (decoded_addr(CSRs.mtohost)) { when (reg_tohost === UInt(0) || host_csr_req_fire) { reg_tohost := wdata } }
when (decoded_addr(CSRs.stats)) { reg_stats := wdata(0) } when (decoded_addr(CSRs.stats)) { reg_stats := wdata(0) }
when (decoded_addr(CSRs.mtvec)) { reg_mtvec := wdata & ~UInt("b11") }
if (usingVM) { if (usingVM) {
when (decoded_addr(CSRs.sstatus)) { when (decoded_addr(CSRs.sstatus)) {
val new_sstatus = new SStatus().fromBits(wdata) val new_sstatus = new MStatus().fromBits(wdata)
reg_mstatus.ie := new_sstatus.ie reg_mstatus.sie := new_sstatus.sie
reg_mstatus.ie1 := new_sstatus.pie reg_mstatus.spie := new_sstatus.spie
reg_mstatus.prv1 := Mux[UInt](new_sstatus.ps, PRV_S, PRV_U) reg_mstatus.spp := new_sstatus.spp
reg_mstatus.mprv := new_sstatus.mprv reg_mstatus.pum := new_sstatus.pum
reg_mstatus.fs := new_sstatus.fs // even without an FPU reg_mstatus.fs := Fill(2, new_sstatus.fs.orR) // even without an FPU
if (usingRoCC) reg_mstatus.xs := new_sstatus.xs if (usingRoCC) reg_mstatus.xs := Fill(2, new_sstatus.xs.orR)
} }
when (decoded_addr(CSRs.sip)) { when (decoded_addr(CSRs.sip)) {
val new_sip = new MIP().fromBits(wdata) val new_sip = new MIP().fromBits(wdata)
reg_mip.ssip := new_sip.ssip reg_mip.ssip := new_sip.ssip
} }
when (decoded_addr(CSRs.sie)) { when (decoded_addr(CSRs.sie)) { reg_mie := (reg_mie & ~reg_mideleg) | (wdata & reg_mideleg) }
val new_sie = new MIP().fromBits(wdata)
reg_mie.ssip := new_sie.ssip
reg_mie.stip := new_sie.stip
}
when (decoded_addr(CSRs.sscratch)) { reg_sscratch := wdata } when (decoded_addr(CSRs.sscratch)) { reg_sscratch := wdata }
when (decoded_addr(CSRs.sptbr)) { reg_sptbr := Cat(wdata(paddrBits-1, pgIdxBits), Bits(0, pgIdxBits)) } when (decoded_addr(CSRs.sptbr)) { reg_sptbr := wdata }
when (decoded_addr(CSRs.sepc)) { reg_sepc := ~(~wdata | (coreInstBytes-1)) } when (decoded_addr(CSRs.sepc)) { reg_sepc := wdata >> log2Up(coreInstBytes) << log2Up(coreInstBytes) }
when (decoded_addr(CSRs.stvec)) { reg_stvec := ~(~wdata | (coreInstBytes-1)) } when (decoded_addr(CSRs.stvec)) { reg_stvec := wdata >> 2 << 2 }
when (decoded_addr(CSRs.scause)) { reg_scause := wdata & UInt((BigInt(1) << (xLen-1)) + 31) /* only implement 5 LSBs and MSB */ }
when (decoded_addr(CSRs.sbadaddr)) { reg_sbadaddr := wdata(vaddrBitsExtended-1,0) }
when (decoded_addr(CSRs.mideleg)) { reg_mideleg := wdata & delegable_interrupts }
when (decoded_addr(CSRs.medeleg)) { reg_medeleg := wdata & delegable_exceptions }
} }
} }
io.rocc.csr.waddr := addr io.rocc.csr.waddr := addr
io.rocc.csr.wdata := wdata io.rocc.csr.wdata := wdata
io.rocc.csr.wen := wen io.rocc.csr.wen := wen
when(this.reset) {
reg_mstatus.zero1 := 0
reg_mstatus.zero2 := 0
reg_mstatus.ie := false
reg_mstatus.prv := PRV_M
reg_mstatus.ie1 := false
reg_mstatus.prv1 := PRV_M /* hard-wired to M when missing user mode */
reg_mstatus.ie2 := false /* hard-wired to 0 when missing supervisor mode */
reg_mstatus.prv2 := PRV_U /* hard-wired to 0 when missing supervisor mode */
reg_mstatus.ie3 := false /* hard-wired to 0 when missing hypervisor mode */
reg_mstatus.prv3 := PRV_U /* hard-wired to 0 when missing hypervisor mode */
reg_mstatus.mprv := false
reg_mstatus.vm := 0
reg_mstatus.fs := 0
reg_mstatus.xs := 0
reg_mstatus.sd_rv32 := false
reg_mstatus.sd := false
}
} }

2
rocket/src/main/scala/frontend.scala
View File

@ -42,7 +42,7 @@ class Frontend(implicit p: Parameters) extends CoreModule()(p) with HasL1CachePa
val s1_pc = ~(~s1_pc_ | (coreInstBytes-1)) // discard PC LSBS (this propagates down the pipeline) val s1_pc = ~(~s1_pc_ | (coreInstBytes-1)) // discard PC LSBS (this propagates down the pipeline)
val s1_same_block = Reg(Bool()) val s1_same_block = Reg(Bool())
val s2_valid = Reg(init=Bool(true)) val s2_valid = Reg(init=Bool(true))
val s2_pc = Reg(init=UInt(startAddr)) val s2_pc = Reg(init=UInt(p(ResetVector)))
val s2_btb_resp_valid = Reg(init=Bool(false)) val s2_btb_resp_valid = Reg(init=Bool(false))
val s2_btb_resp_bits = Reg(btb.io.resp.bits) val s2_btb_resp_bits = Reg(btb.io.resp.bits)
val s2_xcpt_if = Reg(init=Bool(false)) val s2_xcpt_if = Reg(init=Bool(false))

1
rocket/src/main/scala/idecode.scala
View File

@ -174,7 +174,6 @@ object XDecode extends DecodeConstants
SCALL-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N), SCALL-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N),
SBREAK-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N), SBREAK-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N),
SRET-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N), SRET-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N),
MRTS-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N),
WFI-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N), WFI-> List(Y, N,N,N,N,N,N,X,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, N,N,N,N,N,N,CSR.I,N,N,N),
CSRRW-> List(Y, N,N,N,N,N,N,Y,A2_ZERO,A1_RS1, IMM_X, DW_XPR,FN_ADD, N,M_X, MT_X, N,N,N,N,N,Y,CSR.W,N,N,N), CSRRW-> List(Y, N,N,N,N,N,N,Y,A2_ZERO,A1_RS1, IMM_X, DW_XPR,FN_ADD, N,M_X, MT_X, N,N,N,N,N,Y,CSR.W,N,N,N),
CSRRS-> List(Y, N,N,N,N,N,N,Y,A2_ZERO,A1_RS1, IMM_X, DW_XPR,FN_ADD, N,M_X, MT_X, N,N,N,N,N,Y,CSR.S,N,N,N), CSRRS-> List(Y, N,N,N,N,N,N,Y,A2_ZERO,A1_RS1, IMM_X, DW_XPR,FN_ADD, N,M_X, MT_X, N,N,N,N,N,Y,CSR.S,N,N,N),

120
rocket/src/main/scala/instructions.scala
View File

@ -94,12 +94,9 @@ object Instructions {
def SC_D = BitPat("b00011????????????011?????0101111") def SC_D = BitPat("b00011????????????011?????0101111")
def SCALL = BitPat("b00000000000000000000000001110011") def SCALL = BitPat("b00000000000000000000000001110011")
def SBREAK = BitPat("b00000000000100000000000001110011") def SBREAK = BitPat("b00000000000100000000000001110011")
def SRET = BitPat("b00010000000000000000000001110011") def SRET = BitPat("b00010000001000000000000001110011")
def SFENCE_VM = BitPat("b000100000001?????000000001110011") def SFENCE_VM = BitPat("b000100000100?????000000001110011")
def WFI = BitPat("b00010000001000000000000001110011") def WFI = BitPat("b00010000010100000000000001110011")
def MRTH = BitPat("b00110000011000000000000001110011")
def MRTS = BitPat("b00110000010100000000000001110011")
def HRTS = BitPat("b00100000010100000000000001110011")
def CSRRW = BitPat("b?????????????????001?????1110011") def CSRRW = BitPat("b?????????????????001?????1110011")
def CSRRS = BitPat("b?????????????????010?????1110011") def CSRRS = BitPat("b?????????????????010?????1110011")
def CSRRC = BitPat("b?????????????????011?????1110011") def CSRRC = BitPat("b?????????????????011?????1110011")
@ -268,50 +265,63 @@ object CSRs {
val uarch14 = 0xcce val uarch14 = 0xcce
val uarch15 = 0xccf val uarch15 = 0xccf
val sstatus = 0x100 val sstatus = 0x100
val stvec = 0x101
val sie = 0x104 val sie = 0x104
val stvec = 0x105
val sscratch = 0x140 val sscratch = 0x140
val sepc = 0x141 val sepc = 0x141
val scause = 0x142
val sbadaddr = 0x143
val sip = 0x144 val sip = 0x144
val sptbr = 0x180 val sptbr = 0x180
val sasid = 0x181 val sasid = 0x181
val cyclew = 0x900 val scycle = 0xd00
val timew = 0x901
val instretw = 0x902
val stime = 0xd01 val stime = 0xd01
val scause = 0xd42 val sinstret = 0xd02
val sbadaddr = 0xd43
val stimew = 0xa01
val mstatus = 0x300 val mstatus = 0x300
val mtvec = 0x301 val medeleg = 0x302
val mtdeleg = 0x302 val mideleg = 0x303
val mie = 0x304 val mie = 0x304
val mtvec = 0x305
val mtimecmp = 0x321 val mtimecmp = 0x321
val mscratch = 0x340 val mscratch = 0x340
val mepc = 0x341 val mepc = 0x341
val mcause = 0x342 val mcause = 0x342
val mbadaddr = 0x343 val mbadaddr = 0x343
val mip = 0x344 val mip = 0x344
val mtime = 0x701 val mipi = 0x345
val mcpuid = 0xf00 val mucounteren = 0x310
val mimpid = 0xf01 val mscounteren = 0x311
val mhartid = 0xf10 val mucycle_delta = 0x700
val mtohost = 0x780 val mutime_delta = 0x701
val mfromhost = 0x781 val muinstret_delta = 0x702
val mreset = 0x782 val mscycle_delta = 0x704
val mipi = 0x783 val mstime_delta = 0x705
val miobase = 0x784 val msinstret_delta = 0x706
val mcycle = 0xf00
val mtime = 0xf01
val minstret = 0xf02
val misa = 0xf10
val mvendorid = 0xf11
val marchid = 0xf12
val mimpid = 0xf13
val mcfgaddr = 0xf14
val mhartid = 0xf15
val mtohost = 0x7c0
val mfromhost = 0x7c1
val mreset = 0x7c2
val cycleh = 0xc80 val cycleh = 0xc80
val timeh = 0xc81 val timeh = 0xc81
val instreth = 0xc82 val instreth = 0xc82
val cyclehw = 0x980
val timehw = 0x981
val instrethw = 0x982
val stimeh = 0xd81
val stimehw = 0xa81
val mtimecmph = 0x361 val mtimecmph = 0x361
val mtimeh = 0x741 val mucycle_deltah = 0x780
val mrwbase = 0x790 val mutime_deltah = 0x781
val muinstret_deltah = 0x782
val mscycle_deltah = 0x784
val mstime_deltah = 0x785
val msinstret_deltah = 0x786
val mcycleh = 0xf80
val mtimeh = 0xf81
val minstreth = 0xf82
val all = { val all = {
val res = collection.mutable.ArrayBuffer[Int]() val res = collection.mutable.ArrayBuffer[Int]()
res += fflags res += fflags
@ -338,39 +348,50 @@ object CSRs {
res += uarch14 res += uarch14
res += uarch15 res += uarch15
res += sstatus res += sstatus
res += stvec
res += sie res += sie
res += stvec
res += sscratch res += sscratch
res += sepc res += sepc
res += scause
res += sbadaddr
res += sip res += sip
res += sptbr res += sptbr
res += sasid res += sasid
res += cyclew res += scycle
res += timew
res += instretw
res += stime res += stime
res += scause res += sinstret
res += sbadaddr
res += stimew
res += mstatus res += mstatus
res += mtvec res += medeleg
res += mtdeleg res += mideleg
res += mie res += mie
res += mtvec
res += mtimecmp res += mtimecmp
res += mscratch res += mscratch
res += mepc res += mepc
res += mcause res += mcause
res += mbadaddr res += mbadaddr
res += mip res += mip
res += mipi
res += mucounteren
res += mscounteren
res += mucycle_delta
res += mutime_delta
res += muinstret_delta
res += mscycle_delta
res += mstime_delta
res += msinstret_delta
res += mcycle
res += mtime res += mtime
res += mcpuid res += minstret
res += misa
res += mvendorid
res += marchid
res += mimpid res += mimpid
res += mcfgaddr
res += mhartid res += mhartid
res += mtohost res += mtohost
res += mfromhost res += mfromhost
res += mreset res += mreset
res += mipi
res += miobase
res.toArray res.toArray
} }
val all32 = { val all32 = {
@ -378,13 +399,16 @@ object CSRs {
res += cycleh res += cycleh
res += timeh res += timeh
res += instreth res += instreth
res += cyclehw
res += timehw
res += instrethw
res += stimeh
res += stimehw
res += mtimecmph res += mtimecmph
res += mucycle_deltah
res += mutime_deltah
res += muinstret_deltah
res += mscycle_deltah
res += mstime_deltah
res += msinstret_deltah
res += mcycleh
res += mtimeh res += mtimeh
res += minstreth
res.toArray res.toArray
} }
} }

26
rocket/src/main/scala/ptw.scala
View File

@ -15,7 +15,6 @@ class PTWReq(implicit p: Parameters) extends CoreBundle()(p) {
} }
class PTWResp(implicit p: Parameters) extends CoreBundle()(p) { class PTWResp(implicit p: Parameters) extends CoreBundle()(p) {
val error = Bool()
val pte = new PTE val pte = new PTE
} }
@ -27,7 +26,7 @@ class TLBPTWIO(implicit p: Parameters) extends CoreBundle()(p) {
} }
class DatapathPTWIO(implicit p: Parameters) extends CoreBundle()(p) { class DatapathPTWIO(implicit p: Parameters) extends CoreBundle()(p) {
val ptbr = UInt(INPUT, paddrBits) val ptbr = UInt(INPUT, ppnBits)
val invalidate = Bool(INPUT) val invalidate = Bool(INPUT)
val status = new MStatus().asInput val status = new MStatus().asInput
} }
@ -59,7 +58,7 @@ class PTW(n: Int)(implicit p: Parameters) extends CoreModule()(p) {
val dpath = new DatapathPTWIO val dpath = new DatapathPTWIO
} }
val s_ready :: s_req :: s_wait :: s_set_dirty :: s_wait_dirty :: s_done :: s_error :: Nil = Enum(UInt(), 7) val s_ready :: s_req :: s_wait :: s_set_dirty :: s_wait_dirty :: s_done :: Nil = Enum(UInt(), 6)
val state = Reg(init=s_ready) val state = Reg(init=s_ready)
val count = Reg(UInt(width = log2Up(pgLevels))) val count = Reg(UInt(width = log2Up(pgLevels)))
@ -79,7 +78,7 @@ class PTW(n: Int)(implicit p: Parameters) extends CoreModule()(p) {
when (arb.io.out.fire()) { when (arb.io.out.fire()) {
r_req := arb.io.out.bits r_req := arb.io.out.bits
r_req_dest := arb.io.chosen r_req_dest := arb.io.chosen
r_pte.ppn := io.dpath.ptbr(paddrBits-1,pgIdxBits) r_pte.ppn := io.dpath.ptbr
} }
val (pte_cache_hit, pte_cache_data) = { val (pte_cache_hit, pte_cache_data) = {
@ -122,16 +121,12 @@ class PTW(n: Int)(implicit p: Parameters) extends CoreModule()(p) {
io.mem.req.bits.kill := Bool(false) io.mem.req.bits.kill := Bool(false)
io.mem.req.bits.data := pte_wdata.toBits io.mem.req.bits.data := pte_wdata.toBits
val resp_err = state === s_error
val resp_val = state === s_done || resp_err
val r_resp_ppn = io.mem.req.bits.addr >> pgIdxBits val r_resp_ppn = io.mem.req.bits.addr >> pgIdxBits
val resp_ppn = Vec((0 until pgLevels-1).map(i => Cat(r_resp_ppn >> pgLevelBits*(pgLevels-i-1), r_req.addr(pgLevelBits*(pgLevels-i-1)-1,0))) :+ r_resp_ppn)(count) val resp_ppn = Vec((0 until pgLevels-1).map(i => Cat(r_resp_ppn >> pgLevelBits*(pgLevels-i-1), r_req.addr(pgLevelBits*(pgLevels-i-1)-1,0))) :+ r_resp_ppn)(count)
val resp_val = state === s_done
for (i <- 0 until io.requestor.size) { for (i <- 0 until io.requestor.size) {
val me = r_req_dest === UInt(i) io.requestor(i).resp.valid := resp_val && (r_req_dest === i)
io.requestor(i).resp.valid := resp_val && me
io.requestor(i).resp.bits.error := resp_err
io.requestor(i).resp.bits.pte := r_pte io.requestor(i).resp.bits.pte := r_pte
io.requestor(i).resp.bits.pte.ppn := resp_ppn io.requestor(i).resp.bits.pte.ppn := resp_ppn
io.requestor(i).invalidate := io.dpath.invalidate io.requestor(i).invalidate := io.dpath.invalidate
@ -161,14 +156,14 @@ class PTW(n: Int)(implicit p: Parameters) extends CoreModule()(p) {
state := s_req state := s_req
} }
when (io.mem.resp.valid) { when (io.mem.resp.valid) {
state := s_error state := s_done
when (pte.leaf() && set_dirty_bit) {
state := s_set_dirty
}
when (pte.table() && count < pgLevels-1) { when (pte.table() && count < pgLevels-1) {
state := s_req state := s_req
count := count + 1 count := count + 1
} }
when (pte.leaf()) {
state := Mux(set_dirty_bit, s_set_dirty, s_done)
}
} }
} }
is (s_set_dirty) { is (s_set_dirty) {
@ -187,8 +182,5 @@ class PTW(n: Int)(implicit p: Parameters) extends CoreModule()(p) {
is (s_done) { is (s_done) {
state := s_ready state := s_ready
} }
is (s_error) {
state := s_ready
}
} }
} }

10
rocket/src/main/scala/rocc.scala
View File

@ -47,7 +47,7 @@ class RoCCInterface(implicit p: Parameters) extends CoreBundle()(p) {
val resp = Decoupled(new RoCCResponse) val resp = Decoupled(new RoCCResponse)
val mem = new HellaCacheIO()(p.alterPartial({ case CacheName => "L1D" })) val mem = new HellaCacheIO()(p.alterPartial({ case CacheName => "L1D" }))
val busy = Bool(OUTPUT) val busy = Bool(OUTPUT)
val s = Bool(INPUT) val status = new MStatus().asInput
val interrupt = Bool(OUTPUT) val interrupt = Bool(OUTPUT)
// These should be handled differently, eventually // These should be handled differently, eventually
@ -142,8 +142,7 @@ class TranslatorExample(implicit p: Parameters) extends RoCC()(p) {
val req_rd = Reg(io.resp.bits.rd) val req_rd = Reg(io.resp.bits.rd)
val req_offset = req_addr(pgIdxBits - 1, 0) val req_offset = req_addr(pgIdxBits - 1, 0)
val req_vpn = req_addr(coreMaxAddrBits - 1, pgIdxBits) val req_vpn = req_addr(coreMaxAddrBits - 1, pgIdxBits)
val ppn = Reg(UInt(width = ppnBits)) val pte = Reg(new PTE)
val error = Reg(Bool())
val s_idle :: s_ptw_req :: s_ptw_resp :: s_resp :: Nil = Enum(Bits(), 4) val s_idle :: s_ptw_req :: s_ptw_resp :: s_resp :: Nil = Enum(Bits(), 4)
val state = Reg(init = s_idle) val state = Reg(init = s_idle)
@ -161,8 +160,7 @@ class TranslatorExample(implicit p: Parameters) extends RoCC()(p) {
when (ptw.req.fire()) { state := s_ptw_resp } when (ptw.req.fire()) { state := s_ptw_resp }
when (state === s_ptw_resp && ptw.resp.valid) { when (state === s_ptw_resp && ptw.resp.valid) {
error := ptw.resp.bits.error pte := ptw.resp.bits.pte
ppn := ptw.resp.bits.pte.ppn
state := s_resp state := s_resp
} }
@ -175,7 +173,7 @@ class TranslatorExample(implicit p: Parameters) extends RoCC()(p) {
io.resp.valid := (state === s_resp) io.resp.valid := (state === s_resp)
io.resp.bits.rd := req_rd io.resp.bits.rd := req_rd
io.resp.bits.data := Mux(error, SInt(-1).toUInt, Cat(ppn, req_offset)) io.resp.bits.data := Mux(pte.leaf(), Cat(pte.ppn, req_offset), ~UInt(0, xLen))
io.busy := (state =/= s_idle) io.busy := (state =/= s_idle)
io.interrupt := Bool(false) io.interrupt := Bool(false)

6
rocket/src/main/scala/rocket.scala
View File

@ -22,7 +22,9 @@ case object CoreInstBits extends Field[Int]
case object CoreDataBits extends Field[Int] case object CoreDataBits extends Field[Int]
case object CoreDCacheReqTagBits extends Field[Int] case object CoreDCacheReqTagBits extends Field[Int]
case object NCustomMRWCSRs extends Field[Int] case object NCustomMRWCSRs extends Field[Int]
case object MtvecWritable extends Field[Boolean]
case object MtvecInit extends Field[BigInt] case object MtvecInit extends Field[BigInt]
case object ResetVector extends Field[BigInt]
trait HasCoreParameters extends HasAddrMapParameters { trait HasCoreParameters extends HasAddrMapParameters {
implicit val p: Parameters implicit val p: Parameters
@ -51,8 +53,6 @@ trait HasCoreParameters extends HasAddrMapParameters {
else p(BuildRoCC).flatMap(_.csrs) else p(BuildRoCC).flatMap(_.csrs)
val nRoccCsrs = p(RoccNCSRs) val nRoccCsrs = p(RoccNCSRs)
val nCores = p(HtifKey).nCores val nCores = p(HtifKey).nCores
val mtvecInit = p(MtvecInit)
val startAddr = mtvecInit + 0x100
// Print out log of committed instructions and their writeback values. // Print out log of committed instructions and their writeback values.
// Requires post-processing due to out-of-order writebacks. // Requires post-processing due to out-of-order writebacks.
@ -539,7 +539,7 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p) {
io.rocc.cmd.valid := wb_rocc_val io.rocc.cmd.valid := wb_rocc_val
io.rocc.exception := wb_xcpt && csr.io.status.xs.orR io.rocc.exception := wb_xcpt && csr.io.status.xs.orR
io.rocc.s := csr.io.status.prv.orR // should we just pass all of mstatus? io.rocc.status := csr.io.status
io.rocc.cmd.bits.inst := new RoCCInstruction().fromBits(wb_reg_inst) io.rocc.cmd.bits.inst := new RoCCInstruction().fromBits(wb_reg_inst)
io.rocc.cmd.bits.rs1 := wb_reg_wdata io.rocc.cmd.bits.rs1 := wb_reg_wdata
io.rocc.cmd.bits.rs2 := wb_reg_rs2 io.rocc.cmd.bits.rs2 := wb_reg_rs2

2
rocket/src/main/scala/tile.scala
View File

@ -84,7 +84,7 @@ class RocketTile(resetSignal: Bool = null)(implicit p: Parameters) extends Tile(
})) }))
val dcIF = Module(new SimpleHellaCacheIF()(dcacheParams)) val dcIF = Module(new SimpleHellaCacheIF()(dcacheParams))
rocc.io.cmd <> cmdRouter.io.out(i) rocc.io.cmd <> cmdRouter.io.out(i)
rocc.io.s := core.io.rocc.s rocc.io.status := core.io.rocc.status
rocc.io.exception := core.io.rocc.exception rocc.io.exception := core.io.rocc.exception
rocc.io.host_id := io.host.id rocc.io.host_id := io.host.id
dcIF.io.requestor <> rocc.io.mem dcIF.io.requestor <> rocc.io.mem

37
rocket/src/main/scala/tlb.scala
View File

@ -100,7 +100,6 @@ class TLB(implicit p: Parameters) extends TLBModule()(p) {
val tag_hit_addr = OHToUInt(tag_cam.io.hits) val tag_hit_addr = OHToUInt(tag_cam.io.hits)
// permission bit arrays // permission bit arrays
val valid_array = Reg(Vec(entries, Bool())) // PTE is valid (not equivalent to CAM tag valid bit!)
val ur_array = Reg(Vec(entries, Bool())) // user read permission val ur_array = Reg(Vec(entries, Bool())) // user read permission
val uw_array = Reg(Vec(entries, Bool())) // user write permission val uw_array = Reg(Vec(entries, Bool())) // user write permission
val ux_array = Reg(Vec(entries, Bool())) // user execute permission val ux_array = Reg(Vec(entries, Bool())) // user execute permission
@ -111,13 +110,12 @@ class TLB(implicit p: Parameters) extends TLBModule()(p) {
when (io.ptw.resp.valid) { when (io.ptw.resp.valid) {
val pte = io.ptw.resp.bits.pte val pte = io.ptw.resp.bits.pte
tag_ram(r_refill_waddr) := pte.ppn tag_ram(r_refill_waddr) := pte.ppn
valid_array(r_refill_waddr) := !io.ptw.resp.bits.error ur_array(r_refill_waddr) := pte.ur()
ur_array(r_refill_waddr) := pte.ur() && !io.ptw.resp.bits.error uw_array(r_refill_waddr) := pte.uw()
uw_array(r_refill_waddr) := pte.uw() && !io.ptw.resp.bits.error ux_array(r_refill_waddr) := pte.ux()
ux_array(r_refill_waddr) := pte.ux() && !io.ptw.resp.bits.error sr_array(r_refill_waddr) := pte.sr()
sr_array(r_refill_waddr) := pte.sr() && !io.ptw.resp.bits.error sw_array(r_refill_waddr) := pte.sw()
sw_array(r_refill_waddr) := pte.sw() && !io.ptw.resp.bits.error sx_array(r_refill_waddr) := pte.sx()
sx_array(r_refill_waddr) := pte.sx() && !io.ptw.resp.bits.error
dirty_array(r_refill_waddr) := pte.d dirty_array(r_refill_waddr) := pte.d
} }
@ -126,14 +124,17 @@ class TLB(implicit p: Parameters) extends TLBModule()(p) {
val invalid_entry = PriorityEncoder(~tag_cam.io.valid_bits) val invalid_entry = PriorityEncoder(~tag_cam.io.valid_bits)
val plru = new PseudoLRU(entries) val plru = new PseudoLRU(entries)
val repl_waddr = Mux(has_invalid_entry, invalid_entry, plru.replace) val repl_waddr = Mux(has_invalid_entry, invalid_entry, plru.replace)
val priv = Mux(io.ptw.status.mprv && !io.req.bits.instruction, io.ptw.status.prv1, io.ptw.status.prv) val do_mprv = io.ptw.status.prv === PRV.M && io.ptw.status.mprv && !io.req.bits.instruction
val priv_s = priv === PRV_S val priv = Mux(do_mprv, io.ptw.status.mpp, io.ptw.status.prv)
val priv_uses_vm = priv <= PRV_S val priv_s = priv === PRV.S
val priv_uses_vm = priv <= PRV.S
val req_xwr = Cat(!r_req.store, r_req.store, !(r_req.instruction || r_req.store)) val req_xwr = Cat(!r_req.store, r_req.store, !(r_req.instruction || r_req.store))
val r_array = Mux(priv_s, sr_array.toBits, ur_array.toBits) val ur_bits = ur_array.toBits
val w_array = Mux(priv_s, sw_array.toBits, uw_array.toBits) val pum_ok = ~Mux(io.ptw.status.pum, ur_bits, UInt(0))
val r_array = Mux(priv_s, sr_array.toBits & pum_ok, ur_bits)
val w_array = Mux(priv_s, sw_array.toBits & pum_ok, uw_array.toBits)
val x_array = Mux(priv_s, sx_array.toBits, ux_array.toBits) val x_array = Mux(priv_s, sx_array.toBits, ux_array.toBits)
val vm_enabled = io.ptw.status.vm(3) && priv_uses_vm && !io.req.bits.passthrough val vm_enabled = io.ptw.status.vm(3) && priv_uses_vm && !io.req.bits.passthrough
@ -160,10 +161,10 @@ class TLB(implicit p: Parameters) extends TLBModule()(p) {
io.resp.ppn := Mux(vm_enabled, Mux1H(tag_cam.io.hits, tag_ram), io.req.bits.vpn(ppnBits-1,0)) io.resp.ppn := Mux(vm_enabled, Mux1H(tag_cam.io.hits, tag_ram), io.req.bits.vpn(ppnBits-1,0))
io.resp.hit_idx := tag_cam.io.hits io.resp.hit_idx := tag_cam.io.hits
// clear invalid entries on access, or all entries on a TLB flush // clear entries on a TLB flush.
tag_cam.io.clear := io.ptw.invalidate || io.req.fire() // TODO: selective flushing. careful with superpage mappings (flush it all)
tag_cam.io.clear_mask := ~valid_array.toBits | (tag_cam.io.hits & ~tag_hits) tag_cam.io.clear := io.ptw.invalidate
when (io.ptw.invalidate) { tag_cam.io.clear_mask := ~UInt(0, entries) } tag_cam.io.clear_mask := ~UInt(0, entries)
io.ptw.req.valid := state === s_request io.ptw.req.valid := state === s_request
io.ptw.req.bits.addr := r_refill_tag io.ptw.req.bits.addr := r_refill_tag