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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:17:27 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:17:27 +0000 |
commit | f215e02bf85f68d3a6106c2a1f4f7f063f819064 (patch) | |
tree | 6bb5b92c046312c4e95ac2620b10ddf482d3fa8b /src/VBox/Devices/EFI/Firmware/MdePkg/Include/Protocol/Metronome.h | |
parent | Initial commit. (diff) | |
download | virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.tar.xz virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.zip |
Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/MdePkg/Include/Protocol/Metronome.h')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/MdePkg/Include/Protocol/Metronome.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Include/Protocol/Metronome.h b/src/VBox/Devices/EFI/Firmware/MdePkg/Include/Protocol/Metronome.h new file mode 100644 index 00000000..624c387c --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Include/Protocol/Metronome.h @@ -0,0 +1,74 @@ +/** @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 - 2018, Intel Corporation. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#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 |