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6e9ff14e26
Addendum to608032bdand835c3023. The IRQL is actually raised by KeFreezeExecution() and lowered by KeThawExecution(), always to HIGH_IRQL on MP systems, or if necessary on UP. These functions are called respectively by KdEnterDebugger() and KdExitDebugger().
84 lines
1.9 KiB
C
84 lines
1.9 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/ke/freeze.c
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* PURPOSE: Routines for freezing and unfreezing processors for
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* kernel debugger synchronization.
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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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/* GLOBALS ********************************************************************/
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/* Freeze data */
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KIRQL KiOldIrql;
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ULONG KiFreezeFlag;
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/* FUNCTIONS ******************************************************************/
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BOOLEAN
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NTAPI
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KeFreezeExecution(IN PKTRAP_FRAME TrapFrame,
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IN PKEXCEPTION_FRAME ExceptionFrame)
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{
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BOOLEAN Enable;
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KIRQL OldIrql;
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#ifndef CONFIG_SMP
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UNREFERENCED_PARAMETER(TrapFrame);
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UNREFERENCED_PARAMETER(ExceptionFrame);
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#endif
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/* Disable interrupts, get previous state and set the freeze flag */
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Enable = KeDisableInterrupts();
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KiFreezeFlag = 4;
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#ifndef CONFIG_SMP
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/* Raise IRQL if we have to */
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OldIrql = KeGetCurrentIrql();
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if (OldIrql < DISPATCH_LEVEL)
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OldIrql = KeRaiseIrqlToDpcLevel();
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#else
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/* Raise IRQL to HIGH_LEVEL */
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KeRaiseIrql(HIGH_LEVEL, &OldIrql);
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#endif
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#ifdef CONFIG_SMP
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// TODO: Add SMP support.
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#endif
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/* Save the old IRQL to be restored on unfreeze */
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KiOldIrql = OldIrql;
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/* Return whether interrupts were enabled */
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return Enable;
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}
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VOID
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NTAPI
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KeThawExecution(IN BOOLEAN Enable)
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{
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#ifdef CONFIG_SMP
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// TODO: Add SMP support.
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#endif
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/* Clear the freeze flag */
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KiFreezeFlag = 0;
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/* Cleanup CPU caches */
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KeFlushCurrentTb();
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/* Restore the old IRQL */
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#ifndef CONFIG_SMP
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if (KiOldIrql < DISPATCH_LEVEL)
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#endif
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KeLowerIrql(KiOldIrql);
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/* Re-enable interrupts */
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KeRestoreInterrupts(Enable);
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}
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