reactos/ntoskrnl/kd64/kdlock.c
2021-09-12 18:16:13 +02:00

125 lines
3 KiB
C

/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/kd64/kdlock.c
* PURPOSE: KD64 Port Lock and Breakin Support
* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
/* PRIVATE FUNCTIONS *********************************************************/
VOID
NTAPI
KdpPortLock(VOID)
{
/* Acquire the lock */
KiAcquireSpinLock(&KdpDebuggerLock);
}
VOID
NTAPI
KdpPortUnlock(VOID)
{
/* Release the lock */
KiReleaseSpinLock(&KdpDebuggerLock);
}
BOOLEAN
NTAPI
KdpPollBreakInWithPortLock(VOID)
{
BOOLEAN DoBreak = FALSE;
/* First make sure that KD is enabled */
if (KdDebuggerEnabled)
{
/* Check if a CTRL-C is in the queue */
if (KdpContext.KdpControlCPending)
{
/* Set it and prepare for break */
DoBreak = TRUE;
KdpContext.KdpControlCPending = FALSE;
}
else
{
/* Now get a packet */
if (KdReceivePacket(PACKET_TYPE_KD_POLL_BREAKIN,
NULL,
NULL,
NULL,
NULL) == KdPacketReceived)
{
/* Successful breakin */
DoBreak = TRUE;
}
}
}
/* Tell the caller to do a break */
return DoBreak;
}
/* PUBLIC FUNCTIONS **********************************************************/
/*
* @implemented
*/
BOOLEAN
NTAPI
KdPollBreakIn(VOID)
{
BOOLEAN DoBreak = FALSE, Enable;
/* First make sure that KD is enabled */
if (KdDebuggerEnabled)
{
/* Disable interrupts */
Enable = KeDisableInterrupts();
/* Check if a CTRL-C is in the queue */
if (KdpContext.KdpControlCPending)
{
/* Set it and prepare for break */
KdpControlCPressed = TRUE;
DoBreak = TRUE;
KdpContext.KdpControlCPending = FALSE;
}
else
{
KIRQL OldIrql;
/* Try to acquire the lock */
KeRaiseIrql(HIGH_LEVEL, &OldIrql);
if (KeTryToAcquireSpinLockAtDpcLevel(&KdpDebuggerLock))
{
/* Now get a packet */
if (KdReceivePacket(PACKET_TYPE_KD_POLL_BREAKIN,
NULL,
NULL,
NULL,
NULL) == KdPacketReceived)
{
/* Successful breakin */
DoBreak = TRUE;
KdpControlCPressed = TRUE;
}
/* Let go of the port */
KdpPortUnlock();
}
KeLowerIrql(OldIrql);
}
/* Re-enable interrupts */
KeRestoreInterrupts(Enable);
}
/* Tell the caller to do a break */
return DoBreak;
}