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annotate packages/io/wallclock/current/src/wallclock.cxx @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents b96d8e8b904e
children 2e5af1a83f85
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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 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): jskov
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43 // Contributors: jskov
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44 // Date: 2000-03-28
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45 // Purpose: Wallclock base driver
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46 // Description: This provides a generic wallclock base driver which
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47 // relies on sub-drivers to provide the interface functions
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48 // to the hardware device (see wallclock.hxx for details).
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49 //
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50 // The driver can be configured to run in one of two modes:
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51 // init-get mode:
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52 // In this mode, the hardware driver only needs to
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53 // implement a function to read the hardware clock
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54 // and a (possibly empty) init function which makes
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55 // sure the hardware clock is properly initialized.
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56 // While the driver in this mode has a smaller memory
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57 // foot-print, it does not support battery-backed up
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58 // clocks.
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59 //
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60 // set-get mode:
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61 // Requires both set and get functions for the hardware
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62 // device. While bigger, it allows support of
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63 // battery-backed up clocks.
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64 //
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65 //
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66 //####DESCRIPTIONEND####
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67 //
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68 //==========================================================================
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69
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70 #include <pkgconf/wallclock.h> // Wallclock device config
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71
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72 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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74 #include <cyg/hal/drv_api.h> // Driver API
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76 #include <cyg/io/wallclock.hxx> // The WallClock API
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77
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78
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79 //-----------------------------------------------------------------------------
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80 // Local static variables
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81
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82 static Cyg_WallClock wallclock_instance CYGBLD_ATTRIB_INIT_AFTER( CYG_INIT_CLOCK );
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83
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84 #ifndef CYGSEM_WALLCLOCK_SET_GET_MODE
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85 static cyg_uint32 epoch_ticks;
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86 static cyg_uint32 epoch_time_stamp;
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87 #endif
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88
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89 static cyg_drv_mutex_t wallclock_lock;
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90
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91 Cyg_WallClock *Cyg_WallClock::wallclock;
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92
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93 //-----------------------------------------------------------------------------
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94 // Constructor
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95
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96 Cyg_WallClock::Cyg_WallClock()
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97 {
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98 // install instance pointer
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99 wallclock = &wallclock_instance;
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100
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101 // Initialize lock used for mutually exclusive access to hardware
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102 cyg_drv_mutex_init(&wallclock_lock);
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103
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104 // Always allow low-level driver to initialize clock, even though it
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105 // may not be necessary for set-get mode.
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106 init_hw_seconds();
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107 }
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108
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109 //-----------------------------------------------------------------------------
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110 // Returns the number of seconds elapsed since 1970-01-01 00:00:00.
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111 // This may involve reading the hardware, so it may take anything up to
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112 // a second to complete.
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113
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114 cyg_uint32 Cyg_WallClock::get_current_time()
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115 {
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116 cyg_uint32 res;
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117
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118 while (!cyg_drv_mutex_lock(&wallclock_lock));
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119
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120 #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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121 res = get_hw_seconds();
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122 #else
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123 res = epoch_time_stamp + get_hw_seconds() - epoch_ticks;
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124 #endif
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125
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126 cyg_drv_mutex_unlock(&wallclock_lock);
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127
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128 return res;
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129 }
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130
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131 //-----------------------------------------------------------------------------
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132 // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
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133 // This may involve reading or writing to the hardware, so it may take
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134 // anything up to a second to complete.
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135 void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp )
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136 {
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137 while (!cyg_drv_mutex_lock(&wallclock_lock));
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138
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139 #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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140 set_hw_seconds(time_stamp);
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141 #else
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142 epoch_time_stamp = time_stamp;
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143 epoch_ticks = get_hw_seconds();
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144 #endif
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145
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146 cyg_drv_mutex_unlock(&wallclock_lock);
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147 }
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148
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149 //-----------------------------------------------------------------------------
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150 // End of devs/wallclock/wallclock.cxx