df60fb4cc2
Update DebugAgent to make sure the Local APIC SoftwareEnable bit is set before using the Local APIC Timer. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Jeff Fan <jeff.fan@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18712 6f19259b-4bc3-4df7-8a09-765794883524
150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
/** @file
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Code for debug timer to support debug agent library implementation.
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Copyright (c) 2010 - 2015, 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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@param[out] TimerFrequency Local APIC timer frequency returned.
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@param[in] DumpFlag If TRUE, dump Local APIC timer's parameter.
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@return 32-bit Local APIC timer init count.
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**/
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UINT32
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InitializeDebugTimer (
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OUT UINT32 *TimerFrequency,
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IN BOOLEAN DumpFlag
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)
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{
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UINTN ApicTimerDivisor;
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UINT32 InitialCount;
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UINT32 ApicTimerFrequency;
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InitializeLocalApicSoftwareEnable (TRUE);
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GetApicTimerState (&ApicTimerDivisor, NULL, NULL);
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ApicTimerFrequency = PcdGet32(PcdFSBClock) / (UINT32)ApicTimerDivisor;
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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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ApicTimerFrequency,
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DEBUG_TIMER_INTERVAL
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),
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1000000u
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);
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InitializeApicTimer (ApicTimerDivisor, InitialCount, TRUE, DEBUG_TIMER_VECTOR);
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//
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// Disable Debug Timer interrupt to avoid it is delivered before Debug Port
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// is initialized
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//
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DisableApicTimerInterrupt ();
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if (DumpFlag) {
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DEBUG ((EFI_D_INFO, "Debug Timer: FSB Clock = %d\n", PcdGet32(PcdFSBClock)));
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DEBUG ((EFI_D_INFO, "Debug Timer: Divisor = %d\n", ApicTimerDivisor));
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DEBUG ((EFI_D_INFO, "Debug Timer: Frequency = %d\n", ApicTimerFrequency));
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DEBUG ((EFI_D_INFO, "Debug Timer: InitialCount = %d\n", InitialCount));
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}
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if (TimerFrequency != NULL) {
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*TimerFrequency = ApicTimerFrequency;
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}
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return InitialCount;
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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 OldDebugTimerInterruptState;
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OldDebugTimerInterruptState = GetApicTimerInterruptState ();
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if (OldDebugTimerInterruptState != EnableStatus) {
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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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//
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// Validate the Debug Timer interrupt state
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// This will make additional delay after Local Apic Timer interrupt state is changed.
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// Thus, CPU could handle the potential pending interrupt of Local Apic timer.
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//
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while (GetApicTimerInterruptState () != EnableStatus) {
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CpuPause ();
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}
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}
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return OldDebugTimerInterruptState;
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}
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/**
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Check if the timer is time out.
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@param[in] TimerCycle Timer initial count.
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@param[in] Timer The start timer from the begin.
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@param[in] TimeoutTicker Ticker number need time out.
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@return TRUE Timer time out occurs.
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@retval FALSE Timer does not time out.
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**/
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BOOLEAN
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IsDebugTimerTimeout (
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IN UINT32 TimerCycle,
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IN UINT32 Timer,
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IN UINT32 TimeoutTicker
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)
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{
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UINT64 CurrentTimer;
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UINT64 Delta;
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CurrentTimer = GetApicTimerCurrentCount ();
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//
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// This timer counter counts down. Check for roll over condition.
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// If CurrentTimer is equal to Timer, it does not mean that roll over
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// happened.
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//
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if (CurrentTimer <= Timer) {
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Delta = Timer - CurrentTimer;
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} else {
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//
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// Handle one roll-over.
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//
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Delta = TimerCycle - (CurrentTimer - Timer) + 1;
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}
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return (BOOLEAN) (Delta >= TimeoutTicker);
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}
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