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08021523f8
Use CPU Local APIC timer to handle timeout when read data from debug port, instead of the TimerLib in Debug Communication lib instances. It could remove much duplicated code in Debug Communication Lib instances. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17089 6f19259b-4bc3-4df7-8a09-765794883524
139 lines
3.9 KiB
C
139 lines
3.9 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] Local APIC timer frequency returned.
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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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)
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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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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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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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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 total 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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//
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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);
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}
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return (BOOLEAN) (Delta >= TimeoutTicker);
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}
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