Store and get TSC Frequency with system configuration Table.

[mirror_edk2.git] / PerformancePkg / Library / DxeTscTimerLib / DxeTscTimerLib.c

diff --git a/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c b/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c
index a77e33e219a34de211942f55ea4ef4be3ea38922..95f265558c2aec8b48a5faa4f7a243d8497677e6 100644 (file)
--- a/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c
+++ b/PerformancePkg/Library/DxeTscTimerLib/DxeTscTimerLib.c
@@ -31,21 +31,22 @@
 #include <PiDxe.h>\r
 #include <Ich/GenericIch.h>\r
 \r
+#include <Library/UefiBootServicesTableLib.h>\r
 #include <Library/TimerLib.h>\r
 #include <Library/BaseLib.h>\r
 #include <Library/IoLib.h>\r
 #include <Library/PciLib.h>\r
 #include <Library/PcdLib.h>\r
-#include <Library/HobLib.h>\r
+#include <Library/UefiLib.h>\r
 \r
 #include <Guid/TscFrequency.h>\r
 \r
-UINT64   mTscFrequency;\r
+UINT64 mTscFrequency;\r
 \r
 /** The constructor function determines the actual TSC frequency.\r
 \r
-  First, Get TSC frequency from TSC frequency GUID HOB,\r
-  If the HOB is not found, calculate it.\r
+  First, Get TSC frequency from system configuration table with TSC frequency GUID,\r
+  if the table is not found, install it.\r
 \r
   The TSC counting frequency is determined by comparing how far it counts\r
   during a 1ms period as determined by the ACPI timer. The ACPI timer is\r
@@ -70,25 +71,24 @@ DxeTscTimerLibConstructor (
   IN EFI_SYSTEM_TABLE  *SystemTable\r
   )\r
 {\r
-  EFI_HOB_GUID_TYPE       *GuidHob;\r
-  VOID        *DataInHob;\r
+  EFI_STATUS  Status;\r
+  UINT64      *TscFrequency;\r
   UINT64      StartTSC;\r
   UINT64      EndTSC;\r
   UINT32      TimerAddr;\r
   UINT32      Ticks;\r
 \r
   //\r
-  // Get TSC frequency from TSC frequency GUID HOB.\r
+  // Get TSC frequency from system configuration table with TSC frequency GUID.\r
   //\r
-  GuidHob = GetFirstGuidHob (&gEfiTscFrequencyGuid);\r
-  if (GuidHob != NULL) {\r
-    DataInHob = GET_GUID_HOB_DATA (GuidHob);\r
-    mTscFrequency = * (UINT64 *) DataInHob;\r
+  Status = EfiGetSystemConfigurationTable (&gEfiTscFrequencyGuid, (VOID **) &TscFrequency);\r
+  if (Status == EFI_SUCCESS) {\r
+    mTscFrequency = *TscFrequency;\r
     return EFI_SUCCESS;\r
   }\r
 \r
   //\r
-  // TSC frequency GUID HOB is not found, calculate it.\r
+  // TSC frequency GUID system configuration table is not found, install it.\r
   //\r
 \r
   //\r
@@ -122,8 +122,10 @@ DxeTscTimerLibConstructor (
                       1000                    // Number of ms in a second\r
                     );\r
   //\r
-  // mTscFrequency is now equal to the number of TSC counts per second\r
+  // mTscFrequency is now equal to the number of TSC counts per second, install system configuration table for it.\r
   //\r
+  gBS->InstallConfigurationTable (&gEfiTscFrequencyGuid, &mTscFrequency);\r
+\r
   return EFI_SUCCESS;\r
 }\r
 \r