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annotate packages/io/wallclock/current/src/emulate.cxx @ 80:2085233a121a ecos-sw-2000-04-07

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Merge from eCos master repository on 2000-04-07-07:52:29-BST
author jlarmour
date Fri, 07 Apr 2000 07:45:04 +0000
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1 //==========================================================================
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2 //
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3 // io/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 #include <pkgconf/kernel.h> // Kernel config
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45
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46 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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47 #include <cyg/kernel/ktypes.h>
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48
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49 #include <cyg/io/wallclock.hxx> // The WallClock API
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50
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51 #include <cyg/kernel/clock.hxx> // Access to kernel clock
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52 #include <cyg/kernel/clock.inl>
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53
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54
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55 // Remember the tick count at the time of initialization.
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56 static cyg_tick_count epoch_ticks;
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57
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58 //-----------------------------------------------------------------------------
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59 // Called to initialize the hardware clock with a known valid
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60 // time. Which of course isn't required when doing emulation using the
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61 // kernel clock. But we set the private epoch base to "now".
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62 void
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63 Cyg_WallClock::init_hw_seconds( void )
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64 {
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65 // Remember the current clock tick count.
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66 epoch_ticks = Cyg_Clock::real_time_clock->current_value();
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67 }
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68
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69 //-----------------------------------------------------------------------------
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70 // Returns the number of seconds elapsed since the init call.
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71 cyg_uint32
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72 Cyg_WallClock::get_hw_seconds( void )
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73 {
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74 Cyg_Clock::cyg_resolution res =
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75 Cyg_Clock::real_time_clock->get_resolution();
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76 cyg_tick_count secs = Cyg_Clock::real_time_clock->current_value()
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77 - epoch_ticks;
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78
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79 secs = ( secs * res.dividend ) / ( res.divisor * 1000000000LL ) ;
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80
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81 return secs;
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82 }
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83
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84 //-----------------------------------------------------------------------------
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85 // End of devs/wallclock/emulate.cxx