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debug: Prevent writes to DATA/PROGBUF when busy

This commit is contained in:
Megan Wachs 2017-04-26 11:11:21 -07:00
parent e9db531e81
commit 7ad4cc36f7
1 changed files with 32 additions and 18 deletions
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50
src/main/scala/uncore/devices/debug/Debug.scala
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@ -494,10 +494,12 @@ class TLDebugModuleInner(device: Device, getNComponents: () => Int)(implicit p:
val hartExceptionId = Wire(UInt(sbIdWidth.W))
val dmiProgramBufferRdEn = Wire(init = Vec.fill(cfg.nProgramBufferWords * 4){false.B})
val dmiProgramBufferWrEn = Wire(init = Vec.fill(cfg.nProgramBufferWords * 4){false.B})
val dmiProgramBufferAccessLegal = Wire(init = false.B)
val dmiProgramBufferWrEnMaybe = Wire(init = Vec.fill(cfg.nProgramBufferWords * 4){false.B})
val dmiAbstractDataRdEn = Wire(init = Vec.fill(cfg.nAbstractDataWords * 4){false.B})
val dmiAbstractDataWrEn = Wire(init = Vec.fill(cfg.nAbstractDataWords * 4){false.B})
val dmiAbstractDataAccessLegal = Wire (init = false.B)
val dmiAbstractDataWrEnMaybe = Wire(init = Vec.fill(cfg.nAbstractDataWords * 4){false.B})
//--------------------------------------------------------------
// Registers coming from 'CONTROL' in Outer
@ -628,11 +630,12 @@ class TLDebugModuleInner(device: Device, getNComponents: () => Int)(implicit p:
ABSTRACTAUTOReg.autoexecprogbuf := ABSTRACTAUTOWrData.autoexecprogbuf & ( (1 << cfg.nProgramBufferWords) - 1).U
ABSTRACTAUTOReg.autoexecdata := ABSTRACTAUTOWrData.autoexecdata & ( (1 << cfg.nAbstractDataWords) - 1).U
}
val dmiAbstractDataAccessVec = Wire(init = Vec.fill(cfg.nAbstractDataWords * 4){false.B})
dmiAbstractDataAccessVec := (dmiAbstractDataWrEn zip dmiAbstractDataRdEn).map{ case (r,w) => r | w}
dmiAbstractDataAccessVec := (dmiAbstractDataWrEnMaybe zip dmiAbstractDataRdEn).map{ case (r,w) => r | w}
val dmiProgramBufferAccessVec = Wire(init = Vec.fill(cfg.nProgramBufferWords * 4){false.B})
dmiProgramBufferAccessVec := (dmiProgramBufferWrEn zip dmiProgramBufferRdEn).map{ case (r,w) => r | w}
dmiProgramBufferAccessVec := (dmiProgramBufferWrEnMaybe zip dmiProgramBufferRdEn).map{ case (r,w) => r | w}
val dmiAbstractDataAccess = dmiAbstractDataAccessVec.reduce(_ || _ )
val dmiProgramBufferAccess = dmiProgramBufferAccessVec.reduce(_ || _)
@ -672,14 +675,11 @@ class TLDebugModuleInner(device: Device, getNComponents: () => Int)(implicit p:
// These are byte addressible, s.t. the Processor can use
// byte-addressible instructions to store to them.
val abstractDataMem = Reg(Vec(cfg.nAbstractDataWords*4, UInt(8.W)))
val abstractDataWords = List.tabulate(cfg.nAbstractDataWords) { ii =>
val slice = abstractDataMem.slice(ii * 4, (ii+1)*4)
slice.reduce[UInt]{ case (x: UInt, y: UInt) => Cat(y, x)
}
}
val abstractDataNxt = Wire(init = abstractDataMem)
// --- Program Buffer
val programBufferMem = Reg(Vec(cfg.nProgramBufferWords*4, UInt(8.W)))
val programBufferNxt = Wire(init = programBufferMem)
//--------------------------------------------------------------
// These bits are implementation-specific bits set
@ -728,15 +728,27 @@ class TLDebugModuleInner(device: Device, getNComponents: () => Int)(implicit p:
(DMI_ABSTRACTCS << 2) -> Seq(RWNotify(32, ABSTRACTCSRdData.asUInt(), ABSTRACTCSWrDataVal, ABSTRACTCSRdEn, ABSTRACTCSWrEnMaybe)),
(DMI_ABSTRACTAUTO<< 2) -> Seq(RWNotify(32, ABSTRACTAUTORdData.asUInt(), ABSTRACTAUTOWrDataVal, ABSTRACTAUTORdEn, ABSTRACTAUTOWrEnMaybe)),
(DMI_COMMAND << 2) -> Seq(RWNotify(32, COMMANDRdData.asUInt(), COMMANDWrDataVal, COMMANDRdEn, COMMANDWrEnMaybe)),
(DMI_DATA0 << 2) -> abstractDataMem.zipWithIndex.map{case (x, i) => RWNotify(8, x, x,
(DMI_DATA0 << 2) -> abstractDataMem.zipWithIndex.map{case (x, i) => RWNotify(8, x, abstractDataNxt(i),
dmiAbstractDataRdEn(i),
dmiAbstractDataWrEn(i))},
(DMI_PROGBUF0 << 2) -> programBufferMem.zipWithIndex.map{case (x, i) => RWNotify(8, x, x,
dmiAbstractDataWrEnMaybe(i))},
(DMI_PROGBUF0 << 2) -> programBufferMem.zipWithIndex.map{case (x, i) => RWNotify(8, x, programBufferNxt(i),
dmiProgramBufferRdEn(i),
dmiProgramBufferWrEn(i))},
dmiProgramBufferWrEnMaybe(i))},
(DMIConsts.dmi_haltStatusAddr << 2) -> haltedStatus.map(x => RegField.r(32, x))
)
abstractDataMem.zipWithIndex.foreach { case (x, i) =>
when (dmiAbstractDataWrEnMaybe(i) && dmiAbstractDataAccessLegal) {
x := abstractDataNxt(i)
}
}
programBufferMem.zipWithIndex.foreach { case (x, i) =>
when (dmiProgramBufferWrEnMaybe(i) && dmiProgramBufferAccessLegal) {
x := programBufferNxt(i)
}
}
//--------------------------------------------------------------
// "Variable" ROM Generation
//--------------------------------------------------------------
@ -912,12 +924,14 @@ class TLDebugModuleInner(device: Device, getNComponents: () => Int)(implicit p:
ABSTRACTCSWrEnLegal := (ctrlStateReg === CtrlState(Waiting))
COMMANDWrEnLegal := (ctrlStateReg === CtrlState(Waiting))
ABSTRACTAUTOWrEnLegal := (ctrlStateReg === CtrlState(Waiting))
dmiAbstractDataAccessLegal := (ctrlStateReg === CtrlState(Waiting))
dmiProgramBufferAccessLegal := (ctrlStateReg === CtrlState(Waiting))
errorBusy := (ABSTRACTCSWrEnMaybe && ~ABSTRACTCSWrEnLegal) ||
(ABSTRACTAUTOWrEnMaybe && ~ABSTRACTAUTOWrEnLegal) ||
(COMMANDWrEnMaybe && ~COMMANDWrEnLegal) ||
(dmiAbstractDataAccess && abstractCommandBusy) ||
(dmiProgramBufferAccess && abstractCommandBusy)
errorBusy := (ABSTRACTCSWrEnMaybe && ~ABSTRACTCSWrEnLegal) ||
(ABSTRACTAUTOWrEnMaybe && ~ABSTRACTAUTOWrEnLegal) ||
(COMMANDWrEnMaybe && ~COMMANDWrEnLegal) ||
(dmiAbstractDataAccess && ~dmiAbstractDataAccessLegal) ||
(dmiProgramBufferAccess && ~dmiProgramBufferAccessLegal)
// TODO: Maybe Quick Access
val commandWrIsAccessRegister = (COMMANDWrData.cmdtype === DebugAbstractCommandType.AccessRegister.id.U)