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PcAtChipsetPkg: Add PeiAcpiTimerLib to save Frequency in HOB

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In V2:
1) Update PeiAcpiTimerLib base name to PeiAcpiTimerLib
2) Update PeiAcpiTimerLib to add the missing constructor to enable ACPI IO space
3) Update DxeAcpiTimerLib to cache frequency in constructor.

PeiAcpiTimerLib caches PerformanceCounterFrequency in HOB, then Pei and Dxe
AcpiTimerLib can share the same PerformanceCounterFrequency.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Liming Gao
2018-01-23 10:24:04 +08:00
parent 84391f5795
commit fd501a7984
7 changed files with 213 additions and 9 deletions
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4
PcAtChipsetPkg/Library/AcpiTimerLib/AcpiTimerLib.c
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@@ -1,7 +1,7 @@
/** @file
ACPI Timer implements one instance of Timer Library.
Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@@ -21,6 +21,8 @@
#include <Library/DebugLib.h>
#include <IndustryStandard/Acpi.h>
GUID mFrequencyHobGuid = { 0x3fca54f6, 0xe1a2, 0x4b20, { 0xbe, 0x76, 0x92, 0x6b, 0x4b, 0x48, 0xbf, 0xaa }};
/**
Internal function to retrieves the 64-bit frequency in Hz.