ntoskrnl/kd64/kdlock.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            ntoskrnl/kd64/kdlock.c
   5  * PURPOSE:         KD64 Port Lock and Breakin Support
   6  * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 /* PRIVATE FUNCTIONS *********************************************************/
  16
  17 VOID
  18 NTAPI
  19 KdpPortLock(VOID)
  20 {
  21     /* Acquire the lock */
  22     KiAcquireSpinLock(&KdpDebuggerLock);
  23 }
  24
  25 VOID
  26 NTAPI
  27 KdpPortUnlock(VOID)
  28 {
  29     /* Release the lock */
  30     KiReleaseSpinLock(&KdpDebuggerLock);
  31 }
  32
  33 BOOLEAN
  34 NTAPI
  35 KdpPollBreakInWithPortLock(VOID)
  36 {
  37     BOOLEAN DoBreak = FALSE;
  38
  39     /* First make sure that KD is enabled */
  40     if (KdDebuggerEnabled)
  41     {
  42         /* Check if a CTRL-C is in the queue */
  43         if (KdpContext.KdpControlCPending)
  44         {
  45             /* Set it and prepare for break */
  46             DoBreak = TRUE;
  47             KdpContext.KdpControlCPending = FALSE;
  48         }
  49         else
  50         {
  51             /* Now get a packet */
  52             if (KdReceivePacket(PACKET_TYPE_KD_POLL_BREAKIN,
  53                                 NULL,
  54                                 NULL,
  55                                 NULL,
  56                                 NULL) == KdPacketReceived)
  57             {
  58                 /* Successful breakin */
  59                 DoBreak = TRUE;
  60             }
  61         }
  62     }
  63
  64     /* Tell the caller to do a break */
  65     return DoBreak;
  66 }
  67
  68 /* PUBLIC FUNCTIONS **********************************************************/
  69
  70 /*
  71  * @implemented
  72  */
  73 BOOLEAN
  74 NTAPI
  75 KdPollBreakIn(VOID)
  76 {
  77     BOOLEAN DoBreak = FALSE, Enable;
  78
  79     /* First make sure that KD is enabled */
  80     if (KdDebuggerEnabled)
  81     {
  82         /* Disable interrupts */
  83         Enable = KeDisableInterrupts();
  84
  85         /* Check if a CTRL-C is in the queue */
  86         if (KdpContext.KdpControlCPending)
  87         {
  88             /* Set it and prepare for break */
  89             KdpControlCPressed = TRUE;
  90             DoBreak = TRUE;
  91             KdpContext.KdpControlCPending = FALSE;
  92         }
  93         else
  94         {
  95             KIRQL OldIrql;
  96             /* Try to acquire the lock */
  97             KeRaiseIrql(HIGH_LEVEL, &OldIrql);
  98             if (KeTryToAcquireSpinLockAtDpcLevel(&KdpDebuggerLock))
  99             {
 100                 /* Now get a packet */
 101                 if (KdReceivePacket(PACKET_TYPE_KD_POLL_BREAKIN,
 102                                     NULL,
 103                                     NULL,
 104                                     NULL,
 105                                     NULL) == KdPacketReceived)
 106                 {
 107                     /* Successful breakin */
 108                     DoBreak = TRUE;
 109                     KdpControlCPressed = TRUE;
 110                 }
 111
 112                 /* Let go of the port */
 113                 KdpPortUnlock();
 114             }
 115             KeLowerIrql(OldIrql);
 116         }
 117
 118         /* Re-enable interrupts */
 119         KeRestoreInterrupts(Enable);
 120     }
 121
 122     /* Tell the caller to do a break */
 123     return DoBreak;
 124 }