Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 1 | // This file was extracted from the TCG Published |
| 2 | // Trusted Platform Module Library |
| 3 | // Part 4: Supporting Routines |
| 4 | // Family "2.0" |
| 5 | // Level 00 Revision 01.16 |
| 6 | // October 30, 2014 |
| 7 | |
Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 8 | #include "PlatformData.h" |
| 9 | #include "Platform.h" |
Vadim Bendebury | 01cb92e | 2015-10-21 11:31:37 -0700 | [diff] [blame] | 10 | |
| 11 | #ifdef __linux__ |
| 12 | |
| 13 | #include <sys/time.h> |
| 14 | // Function clock() does not provide accurate wall clock time on linux, let's |
| 15 | // substitite it with our own caclulations. |
| 16 | // |
| 17 | // Return current wall clock modulo milliseconds. |
| 18 | static UINT64 clock(void) |
| 19 | { |
| 20 | struct timeval tv; |
| 21 | gettimeofday(&tv, NULL); |
| 22 | return (UINT64)tv.tv_sec * 1000 + tv.tv_usec / 1000; |
| 23 | } |
| 24 | #else |
| 25 | #include <time.h> |
| 26 | #endif |
Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 27 | // |
| 28 | // |
| 29 | // Functions |
| 30 | // |
| 31 | // _plat__ClockReset() |
| 32 | // |
| 33 | // Set the current clock time as initial time. This function is called at a power on event to reset the clock |
| 34 | // |
| 35 | LIB_EXPORT void |
| 36 | _plat__ClockReset( |
| 37 | void |
| 38 | ) |
| 39 | { |
| 40 | // Implementation specific: Microsoft C set CLOCKS_PER_SEC to be 1/1000, |
| 41 | // so here the measurement of clock() is in millisecond. |
| 42 | s_initClock = clock(); |
| 43 | s_adjustRate = CLOCK_NOMINAL; |
| 44 | return; |
| 45 | } |
| 46 | // |
| 47 | // |
| 48 | // _plat__ClockTimeFromStart() |
| 49 | // |
| 50 | // Function returns the compensated time from the start of the command when |
| 51 | // _plat__ClockTimeFromStart() was called. |
| 52 | // |
| 53 | unsigned long long |
| 54 | _plat__ClockTimeFromStart( |
| 55 | void |
| 56 | ) |
| 57 | { |
| 58 | unsigned long long currentClock = clock(); |
| 59 | return ((currentClock - s_initClock) * CLOCK_NOMINAL) / s_adjustRate; |
| 60 | } |
| 61 | // |
| 62 | // |
| 63 | // _plat__ClockTimeElapsed() |
| 64 | // |
| 65 | // Get the time elapsed from current to the last time the _plat__ClockTimeElapsed() is called. For the first |
| 66 | // _plat__ClockTimeElapsed() call after a power on event, this call report the elapsed time from power on to |
| 67 | // the current call |
| 68 | // |
| 69 | LIB_EXPORT unsigned long long |
| 70 | _plat__ClockTimeElapsed( |
| 71 | void |
| 72 | // |
| 73 | ) |
| 74 | { |
| 75 | unsigned long long elapsed; |
| 76 | unsigned long long currentClock = clock(); |
| 77 | elapsed = ((currentClock - s_initClock) * CLOCK_NOMINAL) / s_adjustRate; |
| 78 | s_initClock += (elapsed * s_adjustRate) / CLOCK_NOMINAL; |
| 79 | #ifdef DEBUGGING_TIME |
| 80 | // Put this in so that TPM time will pass much faster than real time when |
| 81 | // doing debug. |
| 82 | // A value of 1000 for DEBUG_TIME_MULTIPLER will make each ms into a second |
| 83 | // A good value might be 100 |
| 84 | elapsed *= DEBUG_TIME_MULTIPLIER |
| 85 | #endif |
| 86 | return elapsed; |
| 87 | } |
| 88 | // |
| 89 | // |
| 90 | // _plat__ClockAdjustRate() |
| 91 | // |
| 92 | // Adjust the clock rate |
| 93 | // |
| 94 | LIB_EXPORT void |
| 95 | _plat__ClockAdjustRate( |
| 96 | int adjust // IN: the adjust number. It could be positive |
| 97 | // or negative |
| 98 | ) |
| 99 | { |
| 100 | // We expect the caller should only use a fixed set of constant values to |
| 101 | // adjust the rate |
| 102 | switch(adjust) |
| 103 | { |
| 104 | case CLOCK_ADJUST_COARSE: |
| 105 | s_adjustRate += CLOCK_ADJUST_COARSE; |
| 106 | break; |
| 107 | case -CLOCK_ADJUST_COARSE: |
| 108 | s_adjustRate -= CLOCK_ADJUST_COARSE; |
| 109 | break; |
| 110 | case CLOCK_ADJUST_MEDIUM: |
| 111 | s_adjustRate += CLOCK_ADJUST_MEDIUM; |
| 112 | break; |
| 113 | case -CLOCK_ADJUST_MEDIUM: |
| 114 | s_adjustRate -= CLOCK_ADJUST_MEDIUM; |
| 115 | break; |
| 116 | case CLOCK_ADJUST_FINE: |
| 117 | s_adjustRate += CLOCK_ADJUST_FINE; |
| 118 | break; |
| 119 | case -CLOCK_ADJUST_FINE: |
| 120 | s_adjustRate -= CLOCK_ADJUST_FINE; |
| 121 | break; |
| 122 | default: |
| 123 | // ignore any other values; |
| 124 | break; |
| 125 | } |
| 126 | if(s_adjustRate > (CLOCK_NOMINAL + CLOCK_ADJUST_LIMIT)) |
| 127 | s_adjustRate = CLOCK_NOMINAL + CLOCK_ADJUST_LIMIT; |
| 128 | if(s_adjustRate < (CLOCK_NOMINAL - CLOCK_ADJUST_LIMIT)) |
| 129 | s_adjustRate = CLOCK_NOMINAL-CLOCK_ADJUST_LIMIT; |
| 130 | return; |
| 131 | } |