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18b144ea42
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10867 6f19259b-4bc3-4df7-8a09-765794883524
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/** @file
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Code for debug timer to support debug agent library implementation.
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Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "DebugAgent.h"
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/**
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Initialize CPU local APIC timer.
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**/
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VOID
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InitializeDebugTimer (
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VOID
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)
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{
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UINTN ApicTimerDivisor;
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UINT32 InitialCount;
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GetApicTimerState (&ApicTimerDivisor, NULL, NULL);
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//
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// Cpu Local Apic timer interrupt frequency, it is set to 0.1s
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//
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InitialCount = (UINT32)DivU64x32 (
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MultU64x64 (
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PcdGet32(PcdFSBClock) / (UINT32)ApicTimerDivisor,
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100
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),
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1000
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);
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InitializeApicTimer (ApicTimerDivisor, InitialCount, TRUE, DEBUG_TIMER_VECTOR);
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if (MultiProcessorDebugSupport) {
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mDebugMpContext.DebugTimerInitCount = InitialCount;
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}
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}
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/**
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Enable/Disable the interrupt of debug timer and return the interrupt state
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prior to the operation.
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If EnableStatus is TRUE, enable the interrupt of debug timer.
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If EnableStatus is FALSE, disable the interrupt of debug timer.
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@param[in] EnableStatus Enable/Disable.
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@retval TRUE Debug timer interrupt were enabled on entry to this call.
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@retval FALSE Debug timer interrupt were disabled on entry to this call.
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**/
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BOOLEAN
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EFIAPI
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SaveAndSetDebugTimerInterrupt (
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IN BOOLEAN EnableStatus
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)
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{
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BOOLEAN OldInterruptState;
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BOOLEAN OldDebugTimerInterruptState;
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OldInterruptState = SaveAndDisableInterrupts ();
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OldDebugTimerInterruptState = GetApicTimerInterruptState ();
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if (EnableStatus) {
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EnableApicTimerInterrupt ();
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} else {
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DisableApicTimerInterrupt ();
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}
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SetInterruptState (OldInterruptState);
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return OldDebugTimerInterruptState;
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}
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