Data Structures | |
struct | EFI_TIMESTAMP_PROPERTIES |
struct | _EFI_TIMESTAMP_PROTOCOL |
Defines | |
#define | EFI_TIMESTAMP_PROTOCOL_GUID { 0xafbfde41, 0x2e6e, 0x4262, {0xba, 0x65, 0x62, 0xb9, 0x23, 0x6e, 0x54, 0x95 } } |
Typedefs | |
typedef struct _EFI_TIMESTAMP_PROTOCOL | EFI_TIMESTAMP_PROTOCOL |
typedef UINT64(EFIAPI * | TIMESTAMP_GET )(VOID) |
typedef EFI_STATUS(EFIAPI * | TIMESTAMP_GET_PROPERTIES )(OUT EFI_TIMESTAMP_PROPERTIES *Properties) |
Variables | |
EFI_GUID | gEfiTimestampProtocolGuid |
Copyright (c) 2013, Intel Corporation. All rights reserved.
This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#define EFI_TIMESTAMP_PROTOCOL_GUID { 0xafbfde41, 0x2e6e, 0x4262, {0xba, 0x65, 0x62, 0xb9, 0x23, 0x6e, 0x54, 0x95 } } |
typedef struct _EFI_TIMESTAMP_PROTOCOL EFI_TIMESTAMP_PROTOCOL |
Declare forward reference for the Time Stamp Protocol
typedef UINT64(EFIAPI * TIMESTAMP_GET)(VOID) |
Retrieves the current value of a 64-bit free running timestamp counter.
The counter shall count up in proportion to the amount of time that has passed. The counter value will always roll over to zero. The properties of the counter can be retrieved from GetProperties(). The caller should be prepared for the function to return the same value twice across successive calls. The counter value will not go backwards other than when wrapping, as defined by EndValue in GetProperties(). The frequency of the returned timestamp counter value must remain constant. Power management operations that affect clocking must not change the returned counter frequency. The quantization of counter value updates may vary as long as the value reflecting time passed remains consistent.
None. |
The | current value of the free running timestamp counter. |
typedef EFI_STATUS(EFIAPI * TIMESTAMP_GET_PROPERTIES)(OUT EFI_TIMESTAMP_PROPERTIES *Properties) |
Obtains timestamp counter properties including frequency and value limits.
[out] | Properties | The properties of the timestamp counter. |
EFI_SUCCESS | The properties were successfully retrieved. | |
EFI_DEVICE_ERROR | An error occurred trying to retrieve the properties of the timestamp counter subsystem. Properties is not pedated. | |
EFI_INVALID_PARAMETER | Properties is NULL. |