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 **/ 29 UINTN 30 EFIAPI 31 MicroSecondDelay ( 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 **/ 49 UINTN 50 EFIAPI 51 NanoSecondDelay ( 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 **/ 70 UINT64 71 EFIAPI 72 GetPerformanceCounter ( 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 **/ 103 UINT64 104 EFIAPI 105 GetPerformanceCounterProperties ( 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 **/ 126 UINT64 127 EFIAPI 128 GetTimeInNanoSecond ( 129 IN UINT64 Ticks 130 ) 131 { 132 ASSERT (FALSE); 133 return 0; 134 } 135
