/* Main execution loop */
do
{
+ if (!State->Halted)
+ {
NextInst:
- /* Check if this is a new instruction */
- if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;
+ /* Check if this is a new instruction */
+ if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;
- /* Perform an instruction fetch */
- if (!Fast486FetchByte(State, &Opcode))
- {
- /* Exception occurred */
- State->PrefixFlags = 0;
- continue;
- }
+ /* Perform an instruction fetch */
+ if (!Fast486FetchByte(State, &Opcode))
+ {
+ /* Exception occurred */
+ State->PrefixFlags = 0;
+ continue;
+ }
- // TODO: Check for CALL/RET to update ProcedureCallCount.
+ // TODO: Check for CALL/RET to update ProcedureCallCount.
- /* Call the opcode handler */
- CurrentHandler = Fast486OpcodeHandlers[Opcode];
- CurrentHandler(State, Opcode);
+ /* Call the opcode handler */
+ CurrentHandler = Fast486OpcodeHandlers[Opcode];
+ CurrentHandler(State, Opcode);
- /* If this is a prefix, go to the next instruction immediately */
- if (CurrentHandler == Fast486OpcodePrefix) goto NextInst;
+ /* If this is a prefix, go to the next instruction immediately */
+ if (CurrentHandler == Fast486OpcodePrefix) goto NextInst;
- /* A non-prefix opcode has been executed, reset the prefix flags */
- State->PrefixFlags = 0;
+ /* A non-prefix opcode has been executed, reset the prefix flags */
+ State->PrefixFlags = 0;
+ }
/*
* Check if there is an interrupt to execute, or a hardware interrupt signal
* while interrupts are enabled.
*/
- if (State->Flags.Tf)
+ if (State->Flags.Tf && !State->Halted)
{
/* Perform the interrupt */
Fast486PerformInterrupt(State, 0x01);
}
else if (State->IntStatus == FAST486_INT_EXECUTE)
{
+ /* No longer halted */
+ State->Halted = FALSE;
+
/* Perform the interrupt */
Fast486PerformInterrupt(State, State->PendingIntNum);
static VOID
NTAPI
-Fast486IoReadCallback(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
+Fast486IoReadCallback(PFAST486_STATE State, USHORT Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
{
UNREFERENCED_PARAMETER(State);
UNREFERENCED_PARAMETER(Port);
static VOID
NTAPI
-Fast486IoWriteCallback(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
+Fast486IoWriteCallback(PFAST486_STATE State, USHORT Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
{
UNREFERENCED_PARAMETER(State);
UNREFERENCED_PARAMETER(Port);
UNREFERENCED_PARAMETER(DataSize);
}
-static VOID
-NTAPI
-Fast486IdleCallback(PFAST486_STATE State)
-{
- UNREFERENCED_PARAMETER(State);
-}
-
static VOID
NTAPI
Fast486BopCallback(PFAST486_STATE State, UCHAR BopCode)
FAST486_MEM_WRITE_PROC MemWriteCallback,
FAST486_IO_READ_PROC IoReadCallback,
FAST486_IO_WRITE_PROC IoWriteCallback,
- FAST486_IDLE_PROC IdleCallback,
FAST486_BOP_PROC BopCallback,
FAST486_INT_ACK_PROC IntAckCallback,
PULONG Tlb)
State->MemWriteCallback = (MemWriteCallback ? MemWriteCallback : Fast486MemWriteCallback);
State->IoReadCallback = (IoReadCallback ? IoReadCallback : Fast486IoReadCallback );
State->IoWriteCallback = (IoWriteCallback ? IoWriteCallback : Fast486IoWriteCallback );
- State->IdleCallback = (IdleCallback ? IdleCallback : Fast486IdleCallback );
State->BopCallback = (BopCallback ? BopCallback : Fast486BopCallback );
State->IntAckCallback = (IntAckCallback ? IntAckCallback : Fast486IntAckCallback );
FAST486_MEM_WRITE_PROC MemWriteCallback = State->MemWriteCallback;
FAST486_IO_READ_PROC IoReadCallback = State->IoReadCallback;
FAST486_IO_WRITE_PROC IoWriteCallback = State->IoWriteCallback;
- FAST486_IDLE_PROC IdleCallback = State->IdleCallback;
FAST486_BOP_PROC BopCallback = State->BopCallback;
FAST486_INT_ACK_PROC IntAckCallback = State->IntAckCallback;
PULONG Tlb = State->Tlb;
State->MemWriteCallback = MemWriteCallback;
State->IoReadCallback = IoReadCallback;
State->IoWriteCallback = IoWriteCallback;
- State->IdleCallback = IdleCallback;
State->BopCallback = BopCallback;
State->IntAckCallback = IntAckCallback;
State->Tlb = Tlb;