//----------------------------------------------------------------------
//
// doInterrupt
//
// Handle an interrupt or trap.
//
//----------------------------------------------------------------------
void
dointerrupt (unsigned int cause, unsigned int iar, unsigned int isr,
uint32 *trapArgs)
{
int result;
int i;
uint32 args[4];
int intrs;
uint32 handle;
int ihandle;
dbprintf ('t',"Interrupt cause=0x%x iar=0x%x isr=0x%x args=0x%08x.\n",
cause, iar, isr, (int)trapArgs);
// If the TRAP_INSTR bit is set, this was from a trap instruction.
// If the bit isn't set, this was a system interrupt.
if (cause & TRAP_TRAP_INSTR) {
cause &= ~TRAP_TRAP_INSTR;
switch (cause) {
case TRAP_CONTEXT_SWITCH:
dbprintf ('t', "Got a context switch trap!\n");
ProcessSchedule ();
ClkResetProcess();
break;
case TRAP_EXIT:
case TRAP_USER_EXIT:
dbprintf ('t', "Got an exit trap!\n");
ProcessDestroy (currentPCB);
ProcessSchedule ();
ClkResetProcess();
break;
case TRAP_PROCESS_FORK:
dbprintf ('t', "Got a fork trap!\n");
break;
case TRAP_PROCESS_SLEEP:
dbprintf ('t', "Got a process sleep trap!\n");
ProcessSuspend (currentPCB);
ProcessSchedule ();
ClkResetProcess();
break;
case TRAP_PRINTF:
// Call the trap printf handler and pass the arguments and a flag
// indicating whether the trap was called from system mode.
dbprintf ('t', "Got a printf trap!\n");
TrapPrintfHandler (trapArgs, isr & DLX_STATUS_SYSMODE);
break;
case TRAP_OPEN:
// Get the arguments to the trap handler. If this is a user mode trap,
// copy them from user space.
if (isr & DLX_STATUS_SYSMODE) {
args[0] = trapArgs[0];
args[1] = trapArgs[1];
} else {
char filename[32];
// trapArgs points to the trap arguments in user space. There are
// two of them, so copy them to to system space. The first argument
// is a string, so it has to be copied to system space and the
// argument replaced with a pointer to the string in system space.
MemoryCopyUserToSystem (currentPCB, (char *)trapArgs, (char *)args, sizeof(args[0])*2);
MemoryCopyUserToSystem (currentPCB, (char *)(args[0]), (char *)filename, 31);
// Null-terminate the string in case it's longer than 31 characters.
filename[31] = '\0';
// Set the argument to be the filename
args[0] = (uint32)filename;
}
// Allow Open() calls to be interruptible!
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, args[1] + 0x10000);
printf ("Got an open with parameters ('%s',0x%x)\n", (char *)(args[0]), args[1]);
RestoreIntrs (intrs);
break;
case TRAP_CLOSE:
// Allow Close() calls to be interruptible!
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_READ:
// Allow Read() calls to be interruptible!
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_WRITE:
// Allow Write() calls to be interruptible!
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_DELETE:
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_SEEK:
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_PROCESS_GETPID:
ProcessSetResult(currentPCB, GetCurrentPid());
break;
case TRAP_PROCESS_CREATE:
TrapProcessCreateHandler(trapArgs, isr & DLX_STATUS_SYSMODE);
break;
case TRAP_SEM_CREATE:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
ihandle = SemCreate(ihandle);
ProcessSetResult(currentPCB, ihandle); //Return handle
break;
case TRAP_SEM_WAIT:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
handle = SemHandleWait(ihandle);
ProcessSetResult(currentPCB, handle); //Return 1 or 0
break;
case TRAP_SEM_SIGNAL:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
handle = SemHandleSignal(ihandle);
ProcessSetResult(currentPCB, handle); //Return 1 or 0
break;
case TRAP_MALLOC:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
ihandle = (int)malloc(currentPCB, ihandle);
ProcessSetResult(currentPCB, ihandle); //Return handle
break;
case TRAP_MFREE:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
ihandle = mfree(currentPCB, (void*)ihandle);
ProcessSetResult(currentPCB, ihandle); //Return handle
break;
case TRAP_LOCK_CREATE:
ihandle = LockCreate();
ProcessSetResult(currentPCB, ihandle); //Return handle
break;
case TRAP_LOCK_ACQUIRE:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
handle = LockHandleAcquire(ihandle);
ProcessSetResult(currentPCB, handle); //Return 1 or 0
break;
case TRAP_LOCK_RELEASE:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
handle = LockHandleRelease(ihandle);
ProcessSetResult(currentPCB, handle); //Return 1 or 0
break;
case TRAP_COND_CREATE:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
ihandle = CondCreate(ihandle);
ProcessSetResult(currentPCB, ihandle); //Return handle
break;
case TRAP_COND_WAIT:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
ihandle = CondHandleWait(ihandle);
ProcessSetResult(currentPCB, ihandle); //Return 1 or 0
break;
case TRAP_COND_SIGNAL:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
ihandle = CondHandleSignal(ihandle);
ProcessSetResult(currentPCB, ihandle); //Return 1 or 0
break;
case TRAP_COND_BROADCAST:
ihandle = GetIntFromTrapArg(trapArgs, isr & DLX_STATUS_SYSMODE);
ihandle = CondHandleBroadcast(ihandle);
ProcessSetResult(currentPCB, ihandle); //Return 1 or 0
break;
default:
printf ("Got an unrecognized trap (0x%x) - exiting!\n",
cause);
exitsim ();
break;
}
} else {
switch (cause) {
case TRAP_TIMER:
dbprintf ('t', "Got a timer interrupt!\n");
// ClkInterrupt returns 1 when 1 "process quantum" has passed, meaning
// that it's time to call ProcessSchedule again.
if (ClkInterrupt()) {
ProcessSchedule ();
}
break;
case TRAP_KBD:
do {
i = *((uint32 *)DLX_KBD_NCHARSIN);
result = *((uint32 *)DLX_KBD_GETCHAR);
printf ("Got a keyboard interrupt (char=0x%x(%c), nleft=%d)!\n",
result, result, i);
} while (i > 1);
break;
case TRAP_ACCESS:
printf ("Exiting after illegal access at iar=0x%x, isr=0x%x\n", iar, isr);
exitsim ();
break;
case TRAP_ADDRESS:
printf ("Exiting after illegal address at iar=0x%x, isr=0x%x\n",
iar, isr);
exitsim ();
break;
case TRAP_ILLEGALINST:
printf ("Exiting after illegal instruction at iar=0x%x, isr=0x%x\n",
iar, isr);
exitsim ();
break;
case TRAP_PAGEFAULT:
MemoryPageFaultHandler(currentPCB);
break;
default:
printf ("Got an unrecognized system interrupt (0x%x) - exiting!\n",
cause);
exitsim ();
break;
}
}
dbprintf ('t',"About to return from dointerrupt.\n");
// Note that this return may schedule a new process!
intrreturn ();
}
//--------------------------------------------------------------------------
// ProcessKill destroys the current process and then calls ProcessSchedule.
// Therefore, you can only call ProcessKill from inside of a trap.
//--------------------------------------------------------------------------
void ProcessKill() {
dbprintf('m', "ProcessKill: killing processid %d\n", GetCurrentPid());
ProcessDestroy(currentPCB);
ProcessSchedule();
}
VOID
FxObject::DeferredDisposeWorkItem(
VOID
)
/*++
Routine Description:
Invoked by deferred dispose workitem. This is invoked at PASSIVE_LEVEL,
and returns at PASSIVE_LEVEL
Arguments:
None
Return Value:
None
--*/
{
KIRQL oldIrql;
BOOLEAN result, destroy;
destroy = FALSE;
m_SpinLock.Acquire(&oldIrql);
ASSERT(oldIrql == PASSIVE_LEVEL);
//
// Perform the right action based on the objects current state
//
// DisposeChildrenWorker return result can be ignored because we are
// guaranteed to be calling it at PASSIVE.
//
switch (m_ObjectState) {
case FxObjectStateDeferedDisposing:
//
// This will drop the spinlock and move the object to the right state
// before returning.
//
result = PerformDisposingDisposeChildrenLocked(oldIrql, FALSE);
//
// The substree should never defer to the dispose list if we pass FALSE.
//
ASSERT(result);
UNREFERENCED_PARAMETER(result); //for fre build
return;
case FxObjectStateDeferedDeleting:
SetObjectStateLocked(FxObjectStateDeletedDisposing);
result = DisposeChildrenWorker(FxObjectStateDeferedDeleting, oldIrql, FALSE);
ASSERT(result);
UNREFERENCED_PARAMETER(result); //for fre build
//
// This will release the spinlock
//
DeletedAndDisposedWorkerLocked(oldIrql, FALSE);
return;
case FxObjectStateDeferedDestroy:
// Perform final destroy actions now that we are at passive level
destroy = TRUE;
break;
// These are bad states for this event
case FxObjectStateDeletedAndDisposed: // Do nothing
case FxObjectStateDisposed:
case FxObjectStateWaitingForParentDeleteAndDisposed: // Do nothing
case FxObjectStateCreated:
case FxObjectStateWaitingForEarlyDispose:
case FxObjectStateInvalid:
case FxObjectStateDestroyed:
default:
// Bad state
ASSERT(FALSE);
break;
}
m_SpinLock.Release(oldIrql);
if (destroy) {
ProcessDestroy();
}
}
//--------------------------------------------------------------------------
// ProcessKill destroys the current process and then calls ProcessSchedule.
// Therefore, you can only call ProcessKill from inside of a trap.
//--------------------------------------------------------------------------
void ProcessKill(PCB* pcb) {
dbprintf('m', "ProcessKill: killing processid %d\n", GetPidFromAddress(pcb));
ProcessDestroy(pcb);
ProcessSchedule();
}
//----------------------------------------------------------------------
//
// doInterrupt
//
// Handle an interrupt or trap.
//
//----------------------------------------------------------------------
void
dointerrupt (unsigned int cause, unsigned int iar, unsigned int isr,
uint32 *trapArgs)
{
int result;
int i;
uint32 args[4];
int intrs;
dbprintf ('t',"Interrupt cause=0x%x iar=0x%x isr=0x%x args=0x%08x.\n",
cause, iar, isr, (int)trapArgs);
// If the TRAP_INSTR bit is set, this was from a trap instruction.
// If the bit isn't set, this was a system interrupt.
if (cause & TRAP_TRAP_INSTR) {
cause &= ~TRAP_TRAP_INSTR;
switch (cause) {
case TRAP_CONTEXT_SWITCH:
dbprintf ('t', "Got a context switch trap!\n");
ProcessSchedule ();
break;
case TRAP_EXIT:
dbprintf ('t', "Got an exit trap!\n");
ProcessDestroy (currentPCB);
ProcessSchedule ();
break;
case TRAP_PROCESS_FORK:
dbprintf ('t', "Got a fork trap!\n");
break;
case TRAP_PROCESS_SLEEP:
dbprintf ('t', "Got a process sleep trap!\n");
ProcessSuspend (currentPCB);
ProcessSchedule ();
break;
case TRAP_PRINTF:
// Call the trap printf handler and pass the arguments and a flag
// indicating whether the trap was called from system mode.
dbprintf ('t', "Got a printf trap!\n");
TrapPrintfHandler (trapArgs, isr & DLX_STATUS_SYSMODE);
break;
case TRAP_OPEN:
// Get the arguments to the trap handler. If this is a user mode trap,
// copy them from user space.
if (isr & DLX_STATUS_SYSMODE) {
args[0] = trapArgs[0];
args[1] = trapArgs[1];
} else {
char filename[32];
// trapArgs points to the trap arguments in user space. There are
// two of them, so copy them to to system space. The first argument
// is a string, so it has to be copied to system space and the
// argument replaced with a pointer to the string in system space.
MemoryCopyUserToSystem (currentPCB, trapArgs, args, sizeof(args[0])*2);
MemoryCopyUserToSystem (currentPCB, args[0], filename, 31);
// Null-terminate the string in case it's longer than 31 characters.
filename[31] = '\0';
// Set the argument to be the filename
args[0] = (uint32)filename;
}
// Allow Open() calls to be interruptible!
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, args[1] + 0x10000);
printf ("Got an open with parameters ('%s',0x%x)\n", (char *)args[0], args[1]);
RestoreIntrs (intrs);
break;
case TRAP_CLOSE:
// Allow Close() calls to be interruptible!
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_READ:
// Allow Read() calls to be interruptible!
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_WRITE:
// Allow Write() calls to be interruptible!
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_DELETE:
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_SEEK:
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, -1);
RestoreIntrs (intrs);
break;
case TRAP_PROCESS_GETPID:
intrs = EnableIntrs ();
ProcessSetResult (currentPCB, GetCurrentPid());
RestoreIntrs (intrs);
break;
default:
printf ("Got an unrecognized trap (0x%x) - exiting!\n",
cause);
exitsim ();
break;
}
} else {
switch (cause) {
case TRAP_TIMER:
dbprintf ('t', "Got a timer interrupt!\n");
ProcessSchedule ();
break;
case TRAP_KBD:
do {
i = *((uint32 *)DLX_KBD_NCHARSIN);
result = *((uint32 *)DLX_KBD_GETCHAR);
printf ("Got a keyboard interrupt (char=0x%x(%c), nleft=%d)!\n",
result, result, i);
} while (i > 1);
break;
case TRAP_ACCESS:
printf ("Exiting after illegal access at iar=0x%x, isr=0x%x\n",
iar, isr);
exitsim ();
break;
case TRAP_ADDRESS:
printf ("Exiting after illegal address at iar=0x%x, isr=0x%x\n",
iar, isr);
exitsim ();
break;
case TRAP_ILLEGALINST:
printf ("Exiting after illegal instruction at iar=0x%x, isr=0x%x\n",
iar, isr);
exitsim ();
break;
case TRAP_PAGEFAULT:
printf ("Exiting after page fault at iar=0x%x, isr=0x%x\n",
iar, isr);
exitsim ();
break;
default:
printf ("Got an unrecognized system interrupt (0x%x) - exiting!\n",
cause);
exitsim ();
break;
}
}
dbprintf ('t',"About to return from dointerrupt.\n");
// Note that this return may schedule a new process!
intrreturn ();
}