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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 Cygnus eCos Public License |
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12 // Version 1.0 (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://sourceware.cygnus.com/ecos |
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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 Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): nickg |
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33 // Contributors: nickg |
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34 // Date: 1998-07-14 |
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35 // Purpose: Wallclock emulation |
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36 // |
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37 //####DESCRIPTIONEND#### |
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38 // |
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39 //========================================================================== |
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40 |
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41 #include <pkgconf/wallclock.h> // Wallclock device config |
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42 |
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43 #include <cyg/infra/cyg_type.h> // Common type definitions and support |
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44 #include <cyg/hal/hal_diag.h> // HAL diagnostic output |
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45 |
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46 #include <cyg/devs/wallclock.hxx> |
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47 |
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48 #include <cyg/kernel/sched.hxx> |
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49 #include <cyg/kernel/clock.hxx> |
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50 |
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51 #include <cyg/kernel/sched.inl> |
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52 |
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53 #ifdef CYGIMP_WALLCLOCK_EMULATE |
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54 |
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55 /*---------------------------------------------------------------------------*/ |
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56 // Local static variables |
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57 |
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58 static Cyg_WallClock wallclock_instance CYG_INIT_PRIORITY( CLOCK ); |
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59 |
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60 static cyg_tick_count epoch_ticks; |
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61 |
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62 static cyg_uint32 epoch_time_stamp; |
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63 |
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64 Cyg_WallClock *Cyg_WallClock::wallclock; |
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65 |
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66 /*---------------------------------------------------------------------------*/ |
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67 // Constructor |
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68 |
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69 Cyg_WallClock::Cyg_WallClock() |
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70 { |
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71 // install instance pointer |
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72 wallclock = &wallclock_instance; |
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73 } |
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74 |
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75 /*---------------------------------------------------------------------------*/ |
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76 // Returns the current timestamp. This may involve reading the |
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77 // hardware, so it may take anything up to a second to complete. |
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78 |
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79 cyg_uint32 Cyg_WallClock::get_current_time() |
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80 { |
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81 Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution(); |
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82 |
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83 Cyg_Scheduler::lock(); |
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84 |
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85 cyg_tick_count diff = Cyg_Clock::real_time_clock->current_value() |
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86 - epoch_ticks; |
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87 |
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88 diff = ( diff * res.dividend ) / ( res.divisor * 1000000000LL ) ; |
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89 |
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90 Cyg_Scheduler::unlock(); |
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91 |
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92 return epoch_time_stamp + diff; |
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93 } |
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94 |
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95 /*---------------------------------------------------------------------------*/ |
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96 // Sets the value of the timestamp relative to now. This may involve |
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97 // writing to the hardware, so it may take anything up to a second to |
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98 // complete. |
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99 void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp ) |
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100 { |
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101 Cyg_Scheduler::lock(); |
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102 |
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103 epoch_time_stamp = time_stamp; |
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104 epoch_ticks = Cyg_Clock::real_time_clock->current_value(); |
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105 |
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106 Cyg_Scheduler::unlock(); |
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107 } |
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108 |
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109 /*---------------------------------------------------------------------------*/ |
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110 |
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111 #endif |
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112 /*---------------------------------------------------------------------------*/ |
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113 /* End of devs/wallclock/emulate.cxx */ |
