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annotate packages/devs/wallclock/current/src/emulate.cxx @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
parents c38311975d4f
children
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1 //==========================================================================
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2 //
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3 // devs/wallclock/emulate.cxx
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4 //
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5 // Wallclock emulation implementation
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: nickg
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36 // Date: 1999-03-05
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37 // Purpose: Wallclock emulation
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38 //
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39 //####DESCRIPTIONEND####
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40 //
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41 //==========================================================================
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42
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43 #include <pkgconf/wallclock.h> // Wallclock device config
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44
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45 #ifdef CYGIMP_WALLCLOCK_EMULATE
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46
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47 #include <pkgconf/kernel.h> // Kernel config
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48
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49 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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50 #include <cyg/hal/hal_diag.h> // HAL diagnostic output
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51
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52 #include <cyg/devs/wallclock.hxx>
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53
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54 #include <cyg/kernel/ktypes.h>
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55 #include <cyg/kernel/sched.hxx>
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56 #include <cyg/kernel/clock.hxx>
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57
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58 #include <cyg/kernel/sched.inl>
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59
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60
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61 /*---------------------------------------------------------------------------*/
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62 // Local static variables
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63
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64 static Cyg_WallClock wallclock_instance CYG_INIT_PRIORITY( CLOCK );
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65
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66 static cyg_tick_count epoch_ticks;
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67
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68 static cyg_uint32 epoch_time_stamp;
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69
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70 Cyg_WallClock *Cyg_WallClock::wallclock;
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71
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72 /*---------------------------------------------------------------------------*/
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73 // Constructor
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74
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75 Cyg_WallClock::Cyg_WallClock()
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76 {
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77 // install instance pointer
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78 wallclock = &wallclock_instance;
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79 }
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80
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81 /*---------------------------------------------------------------------------*/
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82 // Returns the current timestamp. This may involve reading the
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83 // hardware, so it may take anything up to a second to complete.
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84
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85 cyg_uint32 Cyg_WallClock::get_current_time()
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86 {
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87 Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
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88
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89 Cyg_Scheduler::lock();
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90
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91 cyg_tick_count diff = Cyg_Clock::real_time_clock->current_value()
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92 - epoch_ticks;
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93
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94 diff = ( diff * res.dividend ) / ( res.divisor * 1000000000LL ) ;
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95
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96 Cyg_Scheduler::unlock();
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97
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98 return epoch_time_stamp + diff;
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99 }
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100
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101 /*---------------------------------------------------------------------------*/
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102 // Sets the value of the timestamp relative to now. This may involve
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103 // writing to the hardware, so it may take anything up to a second to
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104 // complete.
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105 void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp )
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106 {
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107 Cyg_Scheduler::lock();
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108
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109 epoch_time_stamp = time_stamp;
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110 epoch_ticks = Cyg_Clock::real_time_clock->current_value();
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111
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112 Cyg_Scheduler::unlock();
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113 }
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114
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115 /*---------------------------------------------------------------------------*/
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116
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117 #endif
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118 /*---------------------------------------------------------------------------*/
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119 /* End of devs/wallclock/emulate.cxx */