VOID
NTAPI
Fast486Initialize(PFAST486_STATE State,
FAST486_MEM_READ_PROC MemReadCallback,
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)
{
/* Set the callbacks (or use default ones if some are NULL) */
State->MemReadCallback = (MemReadCallback ? MemReadCallback : Fast486MemReadCallback );
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 );
/* Set the TLB (if given) */
State->Tlb = Tlb;
/* Reset the CPU */
Fast486Reset(State);
}
VOID
FASTCALL
Fast486ExceptionWithErrorCode(PFAST486_STATE State,
FAST486_EXCEPTIONS ExceptionCode,
ULONG ErrorCode)
{
FAST486_IDT_ENTRY IdtEntry;
/* Increment the exception count */
State->ExceptionCount++;
/* Check if the exception occurred more than once */
if (State->ExceptionCount > 1)
{
/* Then this is a double fault */
ExceptionCode = FAST486_EXCEPTION_DF;
}
/* Check if this is a triple fault */
if (State->ExceptionCount == 3)
{
/* Reset the CPU */
Fast486Reset(State);
return;
}
/* Restore the IP to the saved IP */
State->InstPtr = State->SavedInstPtr;
if (!Fast486GetIntVector(State, ExceptionCode, &IdtEntry))
{
/*
* If this function failed, that means Fast486Exception
* was called again, so just return in this case.
*/
return;
}
/* Perform the interrupt */
if (!Fast486InterruptInternal(State,
IdtEntry.Selector,
MAKELONG(IdtEntry.Offset, IdtEntry.OffsetHigh),
IdtEntry.Type))
{
/*
* If this function failed, that means Fast486Exception
* was called again, so just return in this case.
*/
return;
}
if (EXCEPTION_HAS_ERROR_CODE(ExceptionCode)
&& (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE))
{
/* Push the error code */
if (!Fast486StackPush(State, ErrorCode))
{
/*
* If this function failed, that means Fast486Exception
* was called again, so just return in this case.
*/
return;
}
}
/* Reset the exception count */
State->ExceptionCount = 0;
}
