1/** @file
2  A non-functional instance of the Timer Library.
3
4  Copyright (c) 2007 - 2011, Intel Corporation. All rights reserved.<BR>
5  This program and the accompanying materials
6  are licensed and made available under the terms and conditions of the BSD License
7  which accompanies this distribution.  The full text of the license may be found at
8  http://opensource.org/licenses/bsd-license.php.
9
10  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13**/
14
15#include <Base.h>
16#include <Library/TimerLib.h>
17#include <Library/DebugLib.h>
18
19/**
20  Stalls the CPU for at least the given number of microseconds.
21
22  Stalls the CPU for the number of microseconds specified by MicroSeconds.
23
24  @param  MicroSeconds  The minimum number of microseconds to delay.
25
26  @return The value of MicroSeconds inputted.
27
28**/
29UINTN
30EFIAPI
31MicroSecondDelay (
32  IN      UINTN                     MicroSeconds
33  )
34{
35  ASSERT (FALSE);
36  return MicroSeconds;
37}
38
39/**
40  Stalls the CPU for at least the given number of nanoseconds.
41
42  Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
43
44  @param  NanoSeconds The minimum number of nanoseconds to delay.
45
46  @return The value of NanoSeconds inputted.
47
48**/
49UINTN
50EFIAPI
51NanoSecondDelay (
52  IN      UINTN                     NanoSeconds
53  )
54{
55  ASSERT (FALSE);
56  return 0;
57}
58
59/**
60  Retrieves the current value of a 64-bit free running performance counter.
61
62  The counter can either count up by 1 or count down by 1. If the physical
63  performance counter counts by a larger increment, then the counter values
64  must be translated. The properties of the counter can be retrieved from
65  GetPerformanceCounterProperties().
66
67  @return The current value of the free running performance counter.
68
69**/
70UINT64
71EFIAPI
72GetPerformanceCounter (
73  VOID
74  )
75{
76  ASSERT (FALSE);
77  return 0;
78}
79
80/**
81  Retrieves the 64-bit frequency in Hz and the range of performance counter
82  values.
83
84  If StartValue is not NULL, then the value that the performance counter starts
85  with immediately after is it rolls over is returned in StartValue. If
86  EndValue is not NULL, then the value that the performance counter end with
87  immediately before it rolls over is returned in EndValue. The 64-bit
88  frequency of the performance counter in Hz is always returned. If StartValue
89  is less than EndValue, then the performance counter counts up. If StartValue
90  is greater than EndValue, then the performance counter counts down. For
91  example, a 64-bit free running counter that counts up would have a StartValue
92  of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
93  that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
94
95  @param  StartValue  The value the performance counter starts with when it
96                      rolls over.
97  @param  EndValue    The value that the performance counter ends with before
98                      it rolls over.
99
100  @return The frequency in Hz.
101
102**/
103UINT64
104EFIAPI
105GetPerformanceCounterProperties (
106  OUT      UINT64                    *StartValue,  OPTIONAL
107  OUT      UINT64                    *EndValue     OPTIONAL
108  )
109{
110  ASSERT (FALSE);
111
112  return (UINT64)(-1);
113}
114
115/**
116  Converts elapsed ticks of performance counter to time in nanoseconds.
117
118  This function converts the elapsed ticks of running performance counter to
119  time value in unit of nanoseconds.
120
121  @param  Ticks     The number of elapsed ticks of running performance counter.
122
123  @return The elapsed time in nanoseconds.
124
125**/
126UINT64
127EFIAPI
128GetTimeInNanoSecond (
129  IN      UINT64                     Ticks
130  )
131{
132  ASSERT (FALSE);
133  return 0;
134}
135