+++ /dev/null
-/** @file\r
-\r
- Copyright (c) 2008-2009, Apple Inc. All rights reserved.\r
- \r
- All rights reserved. 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
-\r
-#include <Library/BaseLib.h>\r
-#include <Library/DebugLib.h>\r
-#include <Library/BaseMemoryLib.h>\r
-#include <Library/UefiBootServicesTableLib.h>\r
-#include <Library/UefiLib.h>\r
-#include <Library/PcdLib.h>\r
-#include <Library/TimerLib.h>\r
-\r
-#include <Protocol/Metronome.h>\r
-\r
-\r
-\r
-/**\r
- The WaitForTick() function waits for the number of ticks specified by \r
- TickNumber from a known time source in the platform. If TickNumber of \r
- ticks are detected, then EFI_SUCCESS is returned. The actual time passed \r
- between entry of this function and the first tick is between 0 and \r
- TickPeriod 100 nS units. If you want to guarantee that at least TickPeriod \r
- time has elapsed, wait for two ticks. This function waits for a hardware \r
- event to determine when a tick occurs. It is possible for interrupt \r
- processing, or exception processing to interrupt the execution of the \r
- WaitForTick() function. Depending on the hardware source for the ticks, it \r
- is possible for a tick to be missed. This function cannot guarantee that \r
- ticks will not be missed. If a timeout occurs waiting for the specified \r
- number of ticks, then EFI_TIMEOUT is returned.\r
-\r
- @param This The EFI_METRONOME_ARCH_PROTOCOL instance.\r
- @param TickNumber Number of ticks to wait.\r
-\r
- @retval EFI_SUCCESS The wait for the number of ticks specified by TickNumber\r
- succeeded.\r
- @retval EFI_TIMEOUT A timeout occurred waiting for the specified number of ticks.\r
-\r
-**/\r
-EFI_STATUS\r
-EFIAPI\r
-WaitForTick (\r
- IN EFI_METRONOME_ARCH_PROTOCOL *This,\r
- IN UINT32 TickNumber\r
- )\r
-{\r
- //\r
- // Fill me in\r
- //\r
- MicroSecondDelay (10 * TickNumber);\r
- return EFI_UNSUPPORTED;\r
-}\r
-\r
-\r
-\r
-/**\r
- Interface stucture for the Metronome Architectural Protocol.\r
-\r
- @par Protocol Description:\r
- This protocol provides access to a known time source in the platform to the\r
- core. The core uses this known time source to produce core services that \r
- require calibrated delays. \r
-\r
- @param WaitForTick\r
- Waits for a specified number of ticks from a known time source \r
- in the platform. The actual time passed between entry of this \r
- function and the first tick is between 0 and TickPeriod 100 nS \r
- units. If you want to guarantee that at least TickPeriod time \r
- has elapsed, wait for two ticks.\r
-\r
- @param TickPeriod\r
- The period of platform's known time source in 100 nS units. \r
- This value on any platform must be at least 10 uS, and must not \r
- exceed 200 uS. The value in this field is a constant that must \r
- not be modified after the Metronome architectural protocol is \r
- installed. All consumers must treat this as a read-only field.\r
-\r
-**/\r
-EFI_METRONOME_ARCH_PROTOCOL gMetronome = {\r
- WaitForTick,\r
- 100 \r
-};\r
-\r
-\r
-EFI_HANDLE gMetronomeHandle = NULL;\r
-\r
-\r
-\r
-/**\r
- Initialize the state information for the CPU Architectural Protocol\r
-\r
- @param ImageHandle of the loaded driver\r
- @param SystemTable Pointer to the System Table\r
-\r
- @retval EFI_SUCCESS Protocol registered\r
- @retval EFI_OUT_OF_RESOURCES Cannot allocate protocol data structure\r
- @retval EFI_DEVICE_ERROR Hardware problems\r
-\r
-**/\r
-EFI_STATUS\r
-MetronomeInitialize (\r
- IN EFI_HANDLE ImageHandle,\r
- IN EFI_SYSTEM_TABLE *SystemTable\r
- )\r
-{\r
- EFI_STATUS Status;\r
- \r
- //\r
- // Do any hardware init required to make WaitForTick () to work here.\r
- //\r
-\r
- Status = gBS->InstallMultipleProtocolInterfaces (\r
- &gMetronomeHandle,\r
- &gEfiMetronomeArchProtocolGuid, &gMetronome,\r
- NULL\r
- );\r
- ASSERT_EFI_ERROR (Status);\r
-\r
- return Status;\r
-}\r
-\r