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Diffstat (limited to 'src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Metronome.h')
-rw-r--r-- | src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Metronome.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Metronome.h b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Metronome.h new file mode 100644 index 0000000000..358d94b722 --- /dev/null +++ b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Metronome.h @@ -0,0 +1,80 @@ +/** @file + Metronome Architectural Protocol as defined in PI SPEC VOLUME 2 DXE + + This code abstracts the DXE core to provide delay services. + + Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> + 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. + +**/ + +#ifndef __ARCH_PROTOCOL_METRONOME_H__ +#define __ARCH_PROTOCOL_METRONOME_H__ + +/// +/// Global ID for the Metronome Architectural Protocol +/// +#define EFI_METRONOME_ARCH_PROTOCOL_GUID \ + { 0x26baccb2, 0x6f42, 0x11d4, {0xbc, 0xe7, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 } } + +/// +/// Declare forward reference for the Metronome Architectural Protocol +/// +typedef struct _EFI_METRONOME_ARCH_PROTOCOL EFI_METRONOME_ARCH_PROTOCOL; + +/** + The WaitForTick() function waits for the number of ticks specified by + TickNumber from a known time source in the platform. If TickNumber of + ticks are detected, then EFI_SUCCESS is returned. The actual time passed + between entry of this function and the first tick is between 0 and + TickPeriod 100 nS units. If you want to guarantee that at least TickPeriod + time has elapsed, wait for two ticks. This function waits for a hardware + event to determine when a tick occurs. It is possible for interrupt + processing, or exception processing to interrupt the execution of the + WaitForTick() function. Depending on the hardware source for the ticks, it + is possible for a tick to be missed. This function cannot guarantee that + ticks will not be missed. If a timeout occurs waiting for the specified + number of ticks, then EFI_TIMEOUT is returned. + + @param This The EFI_METRONOME_ARCH_PROTOCOL instance. + @param TickNumber Number of ticks to wait. + + @retval EFI_SUCCESS The wait for the number of ticks specified by TickNumber + succeeded. + @retval EFI_TIMEOUT A timeout occurred waiting for the specified number of ticks. + +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_METRONOME_WAIT_FOR_TICK)( + IN EFI_METRONOME_ARCH_PROTOCOL *This, + IN UINT32 TickNumber + ); + +/// +/// This protocol provides access to a known time source in the platform to the +/// core. The core uses this known time source to produce core services that +/// require calibrated delays. +/// +struct _EFI_METRONOME_ARCH_PROTOCOL { + EFI_METRONOME_WAIT_FOR_TICK WaitForTick; + + /// + /// The period of platform's known time source in 100 nS units. + /// This value on any platform must be at least 10 uS, and must not + /// exceed 200 uS. The value in this field is a constant that must + /// not be modified after the Metronome architectural protocol is + /// installed. All consumers must treat this as a read-only field. + /// + UINT32 TickPeriod; +}; + +extern EFI_GUID gEfiMetronomeArchProtocolGuid; + +#endif |