diff options
Diffstat (limited to 'PerformancePkg')
| -rw-r--r-- | PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c | 28 | ||||
| -rw-r--r-- | PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.inf | 5 |
2 files changed, 18 insertions, 15 deletions
diff --git a/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c b/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c index a77e33e219..95f265558c 100644 --- a/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c +++ b/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c @@ -31,21 +31,22 @@ #include <PiDxe.h>
#include <Ich/GenericIch.h>
+#include <Library/UefiBootServicesTableLib.h>
#include <Library/TimerLib.h>
#include <Library/BaseLib.h>
#include <Library/IoLib.h>
#include <Library/PciLib.h>
#include <Library/PcdLib.h>
-#include <Library/HobLib.h>
+#include <Library/UefiLib.h>
#include <Guid/TscFrequency.h>
-UINT64 mTscFrequency;
+UINT64 mTscFrequency;
/** The constructor function determines the actual TSC frequency.
- First, Get TSC frequency from TSC frequency GUID HOB,
- If the HOB is not found, calculate it.
+ First, Get TSC frequency from system configuration table with TSC frequency GUID,
+ if the table is not found, install it.
The TSC counting frequency is determined by comparing how far it counts
during a 1ms period as determined by the ACPI timer. The ACPI timer is
@@ -70,25 +71,24 @@ DxeTscTimerLibConstructor ( IN EFI_SYSTEM_TABLE *SystemTable
)
{
- EFI_HOB_GUID_TYPE *GuidHob;
- VOID *DataInHob;
+ EFI_STATUS Status;
+ UINT64 *TscFrequency;
UINT64 StartTSC;
UINT64 EndTSC;
UINT32 TimerAddr;
UINT32 Ticks;
//
- // Get TSC frequency from TSC frequency GUID HOB.
+ // Get TSC frequency from system configuration table with TSC frequency GUID.
//
- GuidHob = GetFirstGuidHob (&gEfiTscFrequencyGuid);
- if (GuidHob != NULL) {
- DataInHob = GET_GUID_HOB_DATA (GuidHob);
- mTscFrequency = * (UINT64 *) DataInHob;
+ Status = EfiGetSystemConfigurationTable (&gEfiTscFrequencyGuid, (VOID **) &TscFrequency);
+ if (Status == EFI_SUCCESS) {
+ mTscFrequency = *TscFrequency;
return EFI_SUCCESS;
}
//
- // TSC frequency GUID HOB is not found, calculate it.
+ // TSC frequency GUID system configuration table is not found, install it.
//
//
@@ -122,8 +122,10 @@ DxeTscTimerLibConstructor ( 1000 // Number of ms in a second
);
//
- // mTscFrequency is now equal to the number of TSC counts per second
+ // mTscFrequency is now equal to the number of TSC counts per second, install system configuration table for it.
//
+ gBS->InstallConfigurationTable (&gEfiTscFrequencyGuid, &mTscFrequency);
+
return EFI_SUCCESS;
}
diff --git a/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.inf b/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.inf index f56e5a2064..28978d78c7 100644 --- a/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.inf +++ b/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.inf @@ -43,14 +43,15 @@ [LibraryClasses]
+ UefiBootServicesTableLib
PcdLib
PciLib
IoLib
BaseLib
- HobLib
+ UefiLib
[Guids]
- gEfiTscFrequencyGuid ## SOMETIMES_CONSUMES ## Hob
+ gEfiTscFrequencyGuid ## CONSUMES ## System Configuration Table
[Pcd.common]
gPerformancePkgTokenSpaceGuid.PcdPerfPkgAcpiIoPortBaseAddress
|