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d1f95000 | 1 | /** @file\r |
4ca9b6c4 | 2 | Metronome Architectural Protocol as defined in PI SPEC VOLUME 2 DXE\r |
d1f95000 | 3 | \r |
4 | This code abstracts the DXE core to provide delay services.\r | |
5 | \r | |
4ca9b6c4 | 6 | Copyright (c) 2006 - 2008, Intel Corporation \r |
d1f95000 | 7 | All rights reserved. This program and the accompanying materials \r |
8 | are licensed and made available under the terms and conditions of the BSD License \r | |
9 | which accompanies this distribution. The full text of the license may be found at \r | |
10 | http://opensource.org/licenses/bsd-license.php \r | |
11 | \r | |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
14 | \r | |
d1f95000 | 15 | **/\r |
16 | \r | |
17 | #ifndef __ARCH_PROTOCOL_METRONOME_H__\r | |
18 | #define __ARCH_PROTOCOL_METRONOME_H__\r | |
19 | \r | |
99e8ed21 | 20 | ///\r |
21 | /// Global ID for the Metronome Architectural Protocol\r | |
22 | ///\r | |
d1f95000 | 23 | #define EFI_METRONOME_ARCH_PROTOCOL_GUID \\r |
24 | { 0x26baccb2, 0x6f42, 0x11d4, {0xbc, 0xe7, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 } }\r | |
25 | \r | |
99e8ed21 | 26 | ///\r |
27 | /// Declare forward reference for the Metronome Architectural Protocol\r | |
28 | ///\r | |
d1f95000 | 29 | typedef struct _EFI_METRONOME_ARCH_PROTOCOL EFI_METRONOME_ARCH_PROTOCOL;\r |
30 | \r | |
31 | /**\r | |
32 | The WaitForTick() function waits for the number of ticks specified by \r | |
33 | TickNumber from a known time source in the platform. If TickNumber of \r | |
34 | ticks are detected, then EFI_SUCCESS is returned. The actual time passed \r | |
35 | between entry of this function and the first tick is between 0 and \r | |
36 | TickPeriod 100 nS units. If you want to guarantee that at least TickPeriod \r | |
37 | time has elapsed, wait for two ticks. This function waits for a hardware \r | |
38 | event to determine when a tick occurs. It is possible for interrupt \r | |
39 | processing, or exception processing to interrupt the execution of the \r | |
40 | WaitForTick() function. Depending on the hardware source for the ticks, it \r | |
41 | is possible for a tick to be missed. This function cannot guarantee that \r | |
42 | ticks will not be missed. If a timeout occurs waiting for the specified \r | |
43 | number of ticks, then EFI_TIMEOUT is returned.\r | |
44 | \r | |
45 | @param This The EFI_METRONOME_ARCH_PROTOCOL instance.\r | |
46 | @param TickNumber Number of ticks to wait.\r | |
47 | \r | |
48 | @retval EFI_SUCCESS The wait for the number of ticks specified by TickNumber\r | |
49 | succeeded.\r | |
50 | @retval EFI_TIMEOUT A timeout occurred waiting for the specified number of ticks.\r | |
51 | \r | |
52 | **/\r | |
53 | typedef \r | |
54 | EFI_STATUS\r | |
8b13229b | 55 | (EFIAPI *EFI_METRONOME_WAIT_FOR_TICK)(\r |
d1f95000 | 56 | IN EFI_METRONOME_ARCH_PROTOCOL *This,\r |
57 | IN UINT32 TickNumber\r | |
58 | );\r | |
59 | \r | |
44717a39 | 60 | ///\r |
61 | /// This protocol provides access to a known time source in the platform to the\r | |
62 | /// core. The core uses this known time source to produce core services that \r | |
63 | /// require calibrated delays. \r | |
64 | ///\r | |
d1f95000 | 65 | struct _EFI_METRONOME_ARCH_PROTOCOL {\r |
66 | EFI_METRONOME_WAIT_FOR_TICK WaitForTick;\r | |
cce6f7aa | 67 | \r |
68 | ///\r | |
69 | /// The period of platform's known time source in 100 nS units. \r | |
70 | /// This value on any platform must be at least 10 uS, and must not \r | |
71 | /// exceed 200 uS. The value in this field is a constant that must \r | |
72 | /// not be modified after the Metronome architectural protocol is \r | |
73 | /// installed. All consumers must treat this as a read-only field. \r | |
74 | ///\r | |
d1f95000 | 75 | UINT32 TickPeriod;\r |
76 | };\r | |
77 | \r | |
78 | extern EFI_GUID gEfiMetronomeArchProtocolGuid;\r | |
79 | \r | |
80 | #endif\r |