[_CD6_]<dragon>ifu>IFUPLA>Save>IFUPLAImplA.mesa!1

IFUPLAImplA.mesa

Last edited by Curry, November 4, 1984 1:31:53 pm PST

DIRECTORY

Commander,

Dragon,

DragOpsCross,

IFUPLA,

IO,

PLAOps;

IFUPLAImplA: CEDAR PROGRAM

IMPORTS Commander, IO, PLAOps EXPORTS IFUPLA =

BEGIN OPEN IFUPLA, PO: PLAOps;

trapEffectNotSig: ITrapPostEffect ← FIRST [ITrapPostEffect];

trapEffectIsSig: ITrapPostEffect ← LAST [ITrapPostEffect];

condEffectNotSig: CondEffect ← FIRST [CondEffect];

condEffectIsSig: CondEffect ← LAST [CondEffect];

pBusFaultNotSig: Dragon.PBusFaults ← FIRST [Dragon.PBusFaults];

pBusFaultIsSig: Dragon.PBusFaults ← LAST [Dragon.PBusFaults];

GeneratePhAPLA: PUBLIC PROC = {

cur, done, temp, interlock, iStkOverflow: PO.BoolExpr;

noBypass, read1, read2, ac2, bc2, passRt: PO.BoolExpr;

done ← PO.Or[

BE[m:[dontGetNextMacro: TRUE], d:[dontGetNextMacro: FALSE ]],

BE[m:[doMacroJump: TRUE], d:[doMacroJump: TRUE ]] ];

noBypass ← BE[m:[noBypassing: TRUE], d:[noBypassing: TRUE]];

read1 ← BE[m:[pCmndLev1Rd: TRUE], d:[pCmndLev1Rd: TRUE]];

read2 ← BE[m:[pCmndLev2Rd: TRUE], d:[pCmndLev2Rd: TRUE]];

ac2 ← BE[m:[aRegIsC2: TRUE], d:[aRegIsC2: TRUE]];

bc2 ← BE[m:[bRegIsC2: TRUE], d:[bRegIsC2: TRUE]];

passRt ← PO.And[

BE[m:[notPassRtIfAZero: TRUE], d:[notPassRtIfAZero: FALSE]],

BE[m:[aRegIsZero: TRUE], d:[aRegIsZero: TRUE]] ];

interlock ← PO.Or[

PO.And[read2, ac2],

PO.And[read2, bc2, PO.Not[passRt], BE[m:[kIsRtOp: TRUE], d:[kIsRtOp: FALSE]] ],

PO.And[

BE[m:[aluOpFOP: TRUE], d:[aluOpFOP: TRUE]],

BE[m:[cRegIsField: TRUE], d:[cRegIsField: TRUE]] ] ];

Reset

Set[m:[reseting: TRUE], d:[reseting: TRUE], out:[

stateException: TRUE,

stateExceptCode: reseting,

trapPC: TrapPC[ResetTrap], -- really not necessary here

pipeKill1: TRUE,

pipeKill23: TRUE ] ];

cur ← BE[m:[reseting: TRUE], d:[reseting: FALSE]];

Set[s:cur, m:[wereReseting: TRUE], d:[wereReseting: TRUE], out:[

stateException: TRUE,

stateExceptCode: reset,

trapPC: TrapPC[ResetTrap],

pipeKill1: TRUE,

pipeKill23: TRUE ] ];

cur ← PO.And[cur, BE[m:[wereReseting: TRUE], d:[wereReseting: FALSE]]];

Fault

FOR pf: Dragon.PBusFaults IN Dragon.PBusFaults DO -- If not#None THEN fault

IF pf=None THEN LOOP;

Set[s:cur, m:[pBusFault3: pBusFaultIsSig], d:[pBusFault3: pf], out:[

stateException: TRUE,

stateExceptCode: epFault,

trapPC: TrapPC[EUPbusTrap0],

trapOrPFault: TRUE,

pipeKill1: TRUE,

pipeKill23: TRUE ] ];

ENDLOOP;

cur ← PO.And[cur, BE[m:[pBusFault3: pBusFaultIsSig], d:[pBusFault3: None]]];

Reject

Set[s:cur, m:[pBusReject3: TRUE], d:[pBusReject3: TRUE], out:[

stateLast: TRUE,

stateDelay: TRUE,

pipeCycle0: TRUE,

pipeCycle123: TRUE ] ];

cur ← PO.And[cur, BE[m:[pBusReject3: TRUE], d:[pBusReject3: FALSE]]];

Condition

temp ← PO.And[cur, BE[m:[aluCondResult2: TRUE], d:[aluCondResult2: TRUE]]];

Set[s:temp, m:[condEffect2: condEffectIsSig], d:[condEffect2: macroTrap], out:[

stateException: TRUE,

stateExceptCode: euCC,

trapPC: TrapPC[ALUCondEZ],

trapOrCond: TRUE,

pipeKill1: TRUE,

pipeKill23: TRUE ] ];

Set[s:temp, m:[condEffect2: condEffectIsSig], d:[condEffect2: macroJump], out:[

stateException: TRUE,

stateExceptCode: cJump,

pipeKill1: TRUE,

pipeKill23: TRUE ] ];

Set[s:temp, m:[condEffect2: condEffectIsSig], d:[condEffect2: microJump], out:[

stateMicroBranch: TRUE,

pipeKill1: TRUE,

pipeKill23: TRUE ] ];

cur ← PO.And[cur, BE[m:[aluCondResult2: TRUE], d:[aluCondResult2: FALSE]]];

Pipe Interlock

Set[s: PO.And[cur, interlock], out:[

stateLast: TRUE,

stateDelay: TRUE,

pipeCycle0: TRUE,

pipeKill1: TRUE]];

cur ← PO.And[cur, PO.Not[interlock]];

Instruction Fetch Fault (and instruction not ready)

Set[s:cur, m:[iFetchFault: TRUE], d:[iFetchFault: TRUE], out:[

stateException: TRUE,

stateExceptCode: iFtchFault,

trapPC: TrapPC[IFUPageFaultTrap] ]];

cur ← PO.And[cur, BE[m:[iFetchFault: TRUE], d:[iFetchFault: FALSE]]];

Instruction Delayed

Set[s:cur, m:[delayed: TRUE], d:[delayed: TRUE], out:[

stateLast: TRUE,

trapPC: DefaultTrapPC ]];

cur ← PO.And[cur, BE[m:[delayed: TRUE], d:[delayed: FALSE]]];

Instruction not done

Set[s:PO.And[cur, PO.Not[done]], out:[

stateLastPlusOne: TRUE,

trapPC: DefaultTrapPC ]];

cur ← PO.And[cur, done];

Low priority traps inhibited

Set[s:cur, m:[inhibTraps: TRUE], d:[inhibTraps: TRUE], out:[

stateZero: TRUE,

trapPC: DefaultTrapPC ]];

cur ← PO.And[cur, BE[m:[inhibTraps: TRUE], d:[inhibTraps: FALSE]]];

Reschedule Waiting

Set[s:cur, m:[rschlWaiting: TRUE], d:[rschlWaiting: TRUE], out:[

stateException: TRUE,

stateExceptCode: rschlWait,

trapPC: TrapPC[RescheduleTrap] ]];

cur ← PO.And[cur, BE[m:[rschlWaiting: TRUE], d:[rschlWaiting: FALSE]]];

IFU stack overflow

iStkOverflow ←

PO.And[

BE[m:[iStkOverflow: TRUE], d:[iStkOverflow: TRUE]],

PO.Or[

BE[m:[pushPending: TRUE], d:[pushPending: TRUE]],

BE[m:[popPending: TRUE], d:[popPending: FALSE]] ] ];

Set[s: PO.And[cur, iStkOverflow], out:[

stateException: TRUE,

stateExceptCode: iStkOFlow,

trapPC: TrapPC[IFUStackOverflowTrap] ] ];

cur ← PO.And[cur, PO.Not[iStkOverflow]];

EU stack overflow

Set[s:cur, m:[eStkOFlow: TRUE], d:[eStkOFlow: TRUE], out:[

stateException: TRUE,

stateExceptCode: eStkOFlow,

trapPC: TrapPC[EUStackOverflowTrap] ] ];

cur ← PO.And[cur, BE[m:[eStkOFlow: TRUE], d:[eStkOFlow: FALSE]]];

New unexceptional instruction

Set[s:cur, out:[

stateZero: TRUE,

trapPC: DefaultTrapPC ] ];

Bypassing

noBypass should not need to be dependent on interlock

Set[s:noBypass, out:[aluLt: aBus, aluRt: bBus, st2A: bBus, st3AIsCbus: FALSE]];

cur ← PO.Not[noBypass];

Set[s:cur, m:[aRegIsC2: TRUE], d:[aRegIsC2: TRUE], out:[aluLt: rBus]];

cur ← PO.And[cur, BE[m:[aRegIsC2: TRUE], d:[aRegIsC2: FALSE]]];

Set[s:cur, m:[aRegIsC3: TRUE], d:[aRegIsC3: TRUE], out:[aluLt: cBus]];

Set[s:cur, m:[aRegIsC3: TRUE], d:[aRegIsC3: FALSE], out:[aluLt: aBus]];

cur ← PO.Not[noBypass];

Set[s:cur, m:[kIsRtOp: TRUE], d:[kIsRtOp: TRUE], out:[aluRt: kBus]];

cur ← PO.And[cur, BE[m:[kIsRtOp: TRUE], d:[kIsRtOp: FALSE]]];

Set[s:PO.And[cur, bc2, PO.Not[read2]], out:[aluRt: rBus]];

cur ← PO.And[cur, PO.Not[PO.And[bc2, PO.Not[read2]]]];

Set[s:cur, m:[bRegIsC3: TRUE], d:[bRegIsC3: TRUE], out:[aluRt: cBus]];

Set[s:cur, m:[bRegIsC3: TRUE], d:[bRegIsC3: FALSE], out:[aluRt: bBus]];

cur ← PO.Not[noBypass];

Set[s:cur, m:[kIsRtOp: TRUE], d:[kIsRtOp: FALSE], out:[st2A: bBus]];

cur ← PO.And[cur, BE[m:[kIsRtOp: TRUE], d:[kIsRtOp: TRUE]]];

Set[s:PO.And[cur, bc2, PO.Not[read2]], out:[st2A: rBus]];

cur ← PO.And[cur, PO.Not[PO.And[bc2, PO.Not[read2]]]];

Set[s:cur, m:[bRegIsC3: TRUE], d:[bRegIsC3: TRUE], out:[st2A: cBus]];

Set[s:cur, m:[bRegIsC3: TRUE], d:[bRegIsC3: FALSE], out:[st2A: bBus]];

Set[s:PO.And[ PO.Not[noBypass], bc2, passRt ], out:[res3AIsCbus: TRUE]];

Set[s:PO.And[ PO.Not[noBypass], bc2 ], out:[st3AIsCbus: TRUE]];

Set[s:PO.And[ PO.Not[noBypass], read1 ], out:[res3BIsRdData: TRUE]];

};

DefaultTrapPC: Dragon.HexByte = TrapPC[StackUnderflowTrap];

TrapPC: PROC[trap: DragOpsCross.TrapIndex]

RETURNS[trapPC: Dragon.HexByte] =

{trapPC ← LOOPHOLE[trap, Dragon.HexByte]};

BE: PROC [m, d: PhAArgs] RETURNS[PO.BoolExpr] = {

mRef: REF PhAArgs ← NARROW[PhAPLA.mask];

dRef: REF PhAArgs ← NARROW[PhAPLA.data];

mRef^ ← m; dRef^ ← d; RETURN[PO.GetBEForDataMask[PhAPLA]]};

Set: PROC [s: PO.BoolExpr ← NIL, m, d: PhAArgs ← [ ], out: MicroState] = {

res: REF MicroState ← NARROW[PhAPLA.out];

out.pipeNotStep1 ← out.pipeCycle123 OR out.pipeKill1;

out.pipeNotStep23 ← out.pipeCycle123 OR out.pipeKill23;

IF s=NIL

THEN s ← BE[m,d]

ELSE s ← PO.And[s, BE[m,d] ];

res^ ← out; PO.SetOutForBE[PhAPLA, s]};

ReadPhAPLA: PUBLIC PROC[argRec: PhAArgs] RETURNS[resRec: MicroState] = {

arg: REF PhAArgs ← NARROW[PhAPLA.data];

res: REF MicroState ← NARROW[PhAPLA.out];

arg^ ← argRec; PO.GetOutForData[PhAPLA]; resRec ← res^};

PhAPLA: PUBLIC PO.PLA;

genDoc: IO.ROPE = "GenIFUPLAPhA expects the name of the output file";

readDoc: IO.ROPE = "ReadIFUPLAPhA expects the name of the input file";

defaultFile: IO.ROPE = "IFUPLAPhA.pla";

GenIFUPLAPhA: Commander.CommandProc = {

filename: IO.ROPE ← PO.DefaultCMDLine[cmd.commandLine, defaultFile];

PhAPLA ← PO.NewPLA[inName: "IFUPLA.PhAArgs", outName: "IFUPLA.MicroState"];

GeneratePhAPLA[];

PO.WritePLAFile[filename, cmd.out, PhAPLA] };

ReadIFUPLAPhA: Commander.CommandProc = {

PhAPLA ← PO.ReadPLAFile[PO.DefaultCMDLine[cmd.commandLine, defaultFile], cmd.out] };