+++ /dev/null
-/** @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
- TscFrequency = NULL;\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
- ASSERT (TscFrequency != NULL);\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