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annotate packages/io/wallclock/current/src/wallclock.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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children 489eb5632bc3
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1 //==========================================================================
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2 //
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3 // devs/wallclock/wallclock.cxx
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4 //
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5 // Wallclock base
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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): jskov
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35 // Contributors: jskov
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36 // Date: 2000-03-28
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37 // Purpose: Wallclock base driver
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38 // Description: This provides a generic wallclock base driver which
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39 // relies on sub-drivers to provide the interface functions
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40 // to the hardware device (see wallclock.hxx for details).
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41 //
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42 // The driver can be configured to run in one of two modes:
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43 // init-get mode:
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44 // In this mode, the hardware driver only needs to
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45 // implement a function to read the hardware clock
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46 // and a (possibly empty) init function which makes
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47 // sure the hardware clock is properly initialized.
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48 // While the driver in this mode has a smaller memory
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49 // foot-print, it does not support battery-backed up
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50 // clocks.
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51 //
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52 // set-get mode:
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53 // Requires both set and get functions for the hardware
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54 // device. While bigger, it allows support of
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55 // battery-backed up clocks.
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56 //
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57 //
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58 //####DESCRIPTIONEND####
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59 //
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60 //==========================================================================
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61
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62 #include <pkgconf/kernel.h> // Kernel config
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63 #include <pkgconf/wallclock.h> // Wallclock device config
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64
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65 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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66
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67 #include <cyg/kernel/sched.inl> // For lock/unlock
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68
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69 #include <cyg/io/wallclock.hxx> // The WallClock API
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70
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71
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72 //-----------------------------------------------------------------------------
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73 // Local static variables
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74
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75 static Cyg_WallClock wallclock_instance CYG_INIT_PRIORITY( CLOCK );
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76
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77 #ifndef CYGSEM_WALLCLOCK_SET_GET_MODE
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78 static cyg_uint32 epoch_ticks;
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79 static cyg_uint32 epoch_time_stamp;
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80 #endif
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81
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82 Cyg_WallClock *Cyg_WallClock::wallclock;
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83
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84 //-----------------------------------------------------------------------------
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85 // Constructor
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86
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87 Cyg_WallClock::Cyg_WallClock()
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88 {
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89 // install instance pointer
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90 wallclock = &wallclock_instance;
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91
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92 #ifndef CYGSEM_WALLCLOCK_SET_GET_MODE
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93 // Since set_hw_seconds is not going to write to the hardware
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94 // clock, initialize it to a sane state now.
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95 init_hw_seconds();
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96 #endif
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97 }
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98
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99 //-----------------------------------------------------------------------------
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100 // Returns the number of seconds elapsed since 1970-01-01 00:00:00.
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101 // This may involve reading the hardware, so it may take anything up to
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102 // a second to complete.
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103
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104 cyg_uint32 Cyg_WallClock::get_current_time()
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105 {
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106 cyg_uint32 res;
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107
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108 Cyg_Scheduler::lock();
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109
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110 #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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111 res = get_hw_seconds();
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112 #else
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113 res = epoch_time_stamp + get_hw_seconds() - epoch_ticks;
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114 #endif
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115
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116 Cyg_Scheduler::unlock();
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117
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118 return res;
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119 }
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120
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121 //-----------------------------------------------------------------------------
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122 // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
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123 // This may involve reading or writing to the hardware, so it may take
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124 // anything up to a second to complete.
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125 void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp )
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126 {
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127 Cyg_Scheduler::lock();
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128
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129 #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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130 set_hw_seconds(time_stamp);
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131 #else
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132 epoch_time_stamp = time_stamp;
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133 epoch_ticks = get_hw_seconds();
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134 #endif
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135
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136 Cyg_Scheduler::unlock();
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137 }
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138
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139 //-----------------------------------------------------------------------------
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140 // End of devs/wallclock/wallclock.cxx