Add BaseTscTimerLib, and then merge the three TscTimerLib to one directory.

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

diff --git a/PerformancePkg/Library/TscTimerLib/DxeTscTimerLib.c b/PerformancePkg/Library/TscTimerLib/DxeTscTimerLib.c
new file mode 100644 (file)
index 0000000..c5a7894
--- /dev/null
+++ b/PerformancePkg/Library/TscTimerLib/DxeTscTimerLib.c
@@ -0,0 +1,100 @@
+/** @file\r
+  A Dxe Timer Library implementation which uses the Time Stamp Counter in the processor.\r
+\r
+  For Pentium 4 processors, Intel Xeon processors (family [0FH], models [03H and higher]);\r
+    for Intel Core Solo and Intel Core Duo processors (family [06H], model [0EH]);\r
+    for the Intel Xeon processor 5100 series and Intel Core 2 Duo processors (family [06H], model [0FH]);\r
+    for Intel Core 2 and Intel Xeon processors (family [06H], display_model [17H]);\r
+    for Intel Atom processors (family [06H], display_model [1CH]):\r
+  the time-stamp counter increments at a constant rate.\r
+  That rate may be set by the maximum core-clock to bus-clock ratio of the processor or may be set by\r
+  the maximum resolved frequency at which the processor is booted. The maximum resolved frequency may\r
+  differ from the maximum qualified frequency of the processor.\r
+\r
+  The specific processor configuration determines the behavior. Constant TSC behavior ensures that the\r
+  duration of each clock tick is uniform and supports the use of the TSC as a wall clock timer even if\r
+  the processor core changes frequency. This is the architectural behavior moving forward.\r
+\r
+  A Processor's support for invariant TSC is indicated by CPUID.0x80000007.EDX[8].\r
+\r
+  Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>\r
+  This program and the accompanying materials\r
+  are licensed and made available under the terms and conditions of the BSD License\r
+  which accompanies this distribution. The full text of the license may be found at\r
+  http://opensource.org/licenses/bsd-license.php\r
+\r
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+**/\r
+\r
+#include <PiDxe.h>\r
+#include <Library/UefiBootServicesTableLib.h>\r
+#include <Library/UefiLib.h>\r
+#include <Library/DebugLib.h>\r
+#include <Guid/TscFrequency.h>\r
+#include "TscTimerLibInternal.h"\r
+\r
+UINT64 mTscFrequency;\r
+\r
+/** The constructor function determines the actual TSC frequency.\r
+\r
+  First, Get TSC frequency from system configuration table with TSC frequency GUID,\r
+  if the table is not found, install it.\r
+  This function will always return EFI_SUCCESS.\r
+\r
+  @param  ImageHandle       The firmware allocated handle for the EFI image.\r
+  @param  SystemTable       A pointer to the EFI System Table.\r
+\r
+  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+DxeTscTimerLibConstructor (\r
+  IN EFI_HANDLE        ImageHandle,\r
+  IN EFI_SYSTEM_TABLE  *SystemTable\r
+  )\r
+{\r
+  EFI_STATUS  Status;\r
+  UINT64      *TscFrequency;\r
+\r
+  //\r
+  // Get TSC frequency from system configuration table with TSC frequency GUID.\r
+  //\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 system configuration table is not found, install it.\r
+  //\r
+\r
+  Status = gBS->AllocatePool (EfiBootServicesData, sizeof (UINT64), (VOID **) &TscFrequency);\r
+  ASSERT_EFI_ERROR (Status);\r
+\r
+  *TscFrequency = InternalCalculateTscFrequency ();\r
+  //\r
+  // TscFrequency now points to the number of TSC counts per second, install system configuration table for it.\r
+  //\r
+  gBS->InstallConfigurationTable (&gEfiTscFrequencyGuid, TscFrequency);\r
+\r
+  mTscFrequency = *TscFrequency;\r
+  return EFI_SUCCESS;\r
+}\r
+\r
+/**  Get TSC frequency.\r
+\r
+  @return The number of TSC counts per second.\r
+\r
+**/\r
+UINT64\r
+InternalGetTscFrequency (\r
+  VOID\r
+  )\r
+{\r
+  return mTscFrequency;\r
+}\r
+\r