89 lines
1.5 KiB
C
89 lines
1.5 KiB
C
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/*++
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Copyright (c) 1999-2001 Microsoft Corporation. All Rights Reserved.
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Module Name:
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irq.h
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Abstract:
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This module contains defines, global variables, and macros used to enable and disable
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processor maskable interrupts as well as the processor performance counter interrupt.
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Author:
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Joseph Ballantyne
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Environment:
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Kernel Mode
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Revision History:
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--*/
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extern ULONG PerformanceInterruptState;
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#define MASKPERF0INT 1
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#define SaveAndDisableMaskableInterrupts() \
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__asm \
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{ \
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__asm pushfd \
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__asm cli \
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}
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#define RestoreMaskableInterrupts() \
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__asm \
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{ \
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__asm popfd \
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}
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VOID __inline SaveAndDisablePerformanceCounterInterrupt(ULONG *pOldState)
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{
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__asm {
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__asm or PerformanceInterruptState, MASKPERF0INT
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__asm mov eax, ApicPerfInterrupt
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__asm mov ecx, dword ptr[eax]
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__asm or dword ptr[eax], MASKED
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__asm mov eax, pOldState
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__asm mov dword ptr[eax], ecx
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}
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}
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#define DisablePerformanceCounterInterrupt() \
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__asm \
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{ \
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__asm or PerformanceInterruptState, MASKPERF0INT \
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__asm mov eax, ApicPerfInterrupt \
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__asm or dword ptr[eax], MASKED \
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}
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#define RestorePerformanceCounterInterrupt(OldState) \
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__asm \
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{ \
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__asm mov ecx, OldState \
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__asm mov eax, ApicPerfInterrupt \
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__asm test ecx, MASKED \
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__asm jz unmask \
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__asm or PerformanceInterruptState, MASKPERF0INT \
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__asm jmp sethardware \
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__asm unmask: \
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__asm and PerformanceInterruptState, ~(MASKPERF0INT) \
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__asm sethardware: \
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__asm mov dword ptr[eax], ecx \
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}
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