ntoskrnl/ke/freeze.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            ntoskrnl/ke/freeze.c
   5  * PURPOSE:         Routines for freezing and unfreezing processors for
   6  *                  kernel debugger synchronization.
   7  * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
   8  */
   9
  10 /* INCLUDES *******************************************************************/
  11
  12 #include <ntoskrnl.h>
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* GLOBALS ********************************************************************/
  17
  18 /* Freeze data */
  19 KIRQL KiOldIrql;
  20 ULONG KiFreezeFlag;
  21
  22 /* FUNCTIONS ******************************************************************/
  23
  24 BOOLEAN
  25 NTAPI
  26 KeFreezeExecution(IN PKTRAP_FRAME TrapFrame,
  27                   IN PKEXCEPTION_FRAME ExceptionFrame)
  28 {
  29     BOOLEAN Enable;
  30
  31     /* Disable interrupts and get previous state */
  32     Enable = KeDisableInterrupts();
  33
  34     /* Save freeze flag */
  35     KiFreezeFlag = 4;
  36
  37     /* Save the old IRQL */
  38     KiOldIrql = KeGetCurrentIrql();
  39
  40     /* Return whether interrupts were enabled */
  41     return Enable;
  42 }
  43
  44 VOID
  45 NTAPI
  46 KeThawExecution(IN BOOLEAN Enable)
  47 {
  48     /* Cleanup CPU caches */
  49     KeFlushCurrentTb();
  50
  51     /* Re-enable interrupts */
  52     if (Enable) _enable();
  53 }