freeze.c

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/*
 * PROJECT:         ReactOS Kernel
 * LICENSE:         GPL - See COPYING in the top level directory
 * FILE:            ntoskrnl/ke/freeze.c
 * PURPOSE:         Routines for freezing and unfreezing processors for
 *                  kernel debugger synchronization.
 * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
 */

/* INCLUDES *******************************************************************/

#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>

/* GLOBALS ********************************************************************/

/* Freeze data */
KIRQL KiOldIrql;
ULONG KiFreezeFlag;

/* FUNCTIONS ******************************************************************/

BOOLEAN
NTAPI
KeFreezeExecution(IN PKTRAP_FRAME TrapFrame,
                  IN PKEXCEPTION_FRAME ExceptionFrame)
{
    BOOLEAN Enable;

    /* Disable interrupts and get previous state */
    Enable = KeDisableInterrupts();

    /* Save freeze flag */
    KiFreezeFlag = 4;

    /* Save the old IRQL */
    KiOldIrql = KeGetCurrentIrql();

    /* Return whether interrupts were enabled */
    return Enable;
}

VOID
NTAPI
KeThawExecution(IN BOOLEAN Enable)
{
    /* Cleanup CPU caches */
    KeFlushCurrentTb();

    /* Re-enable interrupts */
    if (Enable) _enable();
}