113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/** @file
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A Pei Timer Library implementation which uses the Time Stamp Counter in the processor.
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;******************************************************************************
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;* Copyright (c) 2015, Insyde Software Corp. All Rights Reserved.
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;*
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;* You may not reproduce, distribute, publish, display, perform, modify, adapt,
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;* transmit, broadcast, present, recite, release, license or otherwise exploit
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;* any part of this publication in any form, by any means, without the prior
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;* written permission of Insyde Software Corporation.
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;*
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;******************************************************************************
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Copyright (c) 2009 - 2011, 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 <PiPei.h>
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#include <Library/HobLib.h>
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#include <Guid/TscFrequency.h>
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#include "TscTimerLibInternal.h"
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EFI_STATUS
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EFIAPI
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PeiTscTimerLibConstructor (
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IN EFI_PEI_FILE_HANDLE FileHandle,
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IN CONST EFI_PEI_SERVICES **PeiServices
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)
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{
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EFI_HOB_GUID_TYPE *GuidHob;
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UINT64 TscFrequency;
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//
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// In PeiCore library constructor, hob not ready
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//
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if (FileHandle == NULL) {
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return EFI_SUCCESS;
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}
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//
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// Get TSC frequency from TSC frequency GUID HOB.
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//
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GuidHob = GetFirstGuidHob (&gEfiTscFrequencyGuid);
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if (GuidHob != NULL) {
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return EFI_SUCCESS;
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}
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//
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// TSC frequency GUID HOB is not found, build it.
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//
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TscFrequency = InternalCalculateTscFrequency ();
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//
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// TscFrequency is now equal to the number of TSC counts per second, build GUID HOB for it.
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//
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GuidHob = BuildGuidDataHob (
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&gEfiTscFrequencyGuid,
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&TscFrequency,
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sizeof (UINT64)
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);
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if (GuidHob == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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return EFI_SUCCESS;
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}
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/** Get TSC frequency from TSC frequency GUID HOB, if the HOB is not found, build it.
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@return The number of TSC counts per second.
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**/
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UINT64
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InternalGetTscFrequency (
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VOID
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)
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{
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EFI_HOB_GUID_TYPE *GuidHob;
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UINT64 TscFrequency;
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//
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// Get TSC frequency from TSC frequency GUID HOB.
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//
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GuidHob = GetFirstGuidHob (&gEfiTscFrequencyGuid);
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if (GuidHob != NULL) {
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TscFrequency = *(UINT64 *) GET_GUID_HOB_DATA (GuidHob);
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return TscFrequency;
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}
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//
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// TSC frequency GUID HOB is not found, build it.
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//
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TscFrequency = InternalCalculateTscFrequency ();
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//
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// TscFrequency is now equal to the number of TSC counts per second, build GUID HOB for it.
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//
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BuildGuidDataHob (
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&gEfiTscFrequencyGuid,
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&TscFrequency,
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sizeof (UINT64)
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);
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return TscFrequency;
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}
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