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