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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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59
PcAtChipsetPkg/Library/AcpiTimerLib/DxeAcpiTimerLib.c
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@@ -12,9 +12,27 @@
**/
#include <Base.h>
#include <PiDxe.h>
#include <Library/TimerLib.h>
#include <Library/BaseLib.h>
#include <Library/HobLib.h>
extern GUID mFrequencyHobGuid;
/**
The constructor function enables ACPI IO space.
If ACPI I/O space not enabled, this function will enable it.
It will always return RETURN_SUCCESS.
@retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
**/
RETURN_STATUS
EFIAPI
AcpiTimerLibConstructor (
VOID
);
/**
Calculate TSC frequency.
@@ -54,8 +72,41 @@ InternalGetPerformanceCounterFrequency (
VOID
)
{
if (mPerformanceCounterFrequency == 0) {
mPerformanceCounterFrequency = InternalCalculateTscFrequency ();
}
return mPerformanceCounterFrequency;
}
/**
The constructor function enables ACPI IO space, and caches PerformanceCounterFrequency.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
**/
EFI_STATUS
EFIAPI
DxeAcpiTimerLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_HOB_GUID_TYPE *GuidHob;
//
// Enable ACPI IO space.
//
AcpiTimerLibConstructor ();
//
// Initialize PerformanceCounterFrequency
//
GuidHob = GetFirstGuidHob (&mFrequencyHobGuid);
if (GuidHob != NULL) {
mPerformanceCounterFrequency = *(UINT64*)GET_GUID_HOB_DATA (GuidHob);
} else {
mPerformanceCounterFrequency = InternalCalculateTscFrequency ();
}
return EFI_SUCCESS;
}