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annotate packages/kernel/current/cdl/counters.cdl @ 90:70190fa0fe10 ecos-sw-2000-05-19

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Merge from eCos master repository on 2000-05-19-07:47:03-BST
author jlarmour
date Fri, 19 May 2000 12:47:51 +0000
parents 6736c52df507
children e0c0827131d1
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435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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1 # ====================================================================
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2 #
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3 # counters.cdl
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4 #
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5 # configuration data related to the kernel counters and clocks
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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 # Original data: nickg
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36 # Contributors:
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37 # Date: 1999-07-05
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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 cdl_option CYGVAR_KERNEL_COUNTERS_CLOCK {
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44 display "Provide real-time clock"
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45 requires CYGIMP_KERNEL_INTERRUPTS_DSRS
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46 default_value 1
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47 description "
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48 On all current target systems the kernel can provide a
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49 real-time clock. This clock serves two purposes. First it is
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50 necessary to support clock and alarm related functions.
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51 Second it is needed to implement timeslicing in some of the
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52 schedulers including the mlqueue scheduler. If the
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53 application does not require any of these facilities then it
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54 is possible to disable the real time clock support
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55 completely."
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56 }
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57
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58 cdl_component CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE {
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59 display "Override default clock settings"
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60 requires CYGVAR_KERNEL_COUNTERS_CLOCK
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61 default_value 0
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62 description "
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63 The kernel has default settings for the clock interrupt
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64 frequency. These settings will vary from platform to
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65 platform, but typically there will be a 100 clock interrupts
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66 every second. It is possible to change this frequency, but
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67 it requires some knowledge of the target hardware."
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68
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69 cdl_option CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_PERIOD {
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70 display "Clock hardware initialization value"
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71 flavor data
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72 legal_values 1 to 0x7fffffff
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73 default_value 9999
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74 description "
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75 During system initialization this value is used to initialize
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76 the clock hardware. The exact meaning of the value and the
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77 range of legal values therefore depends on the target hardware,
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78 and the hardware documentation should be consulted for further
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79 details. In addition the clock resolution numerator and
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80 denominator values should be updated. Typical values for
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81 this option would be 150000 on the MN10300 stdeval1 board,
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82 15625 on the tx39 jmr3904 board, and 20833 on the powerpc
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83 cogent board."
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84 }
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85
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86 cdl_option CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_NUMERATOR {
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87 display "Clock resolution numerator"
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88 flavor data
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89 legal_values 1 to 0x7fffffff
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90 default_value 1000000000
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91 description "
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92 If a non-default clock interrupt frequency is used then it
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93 is necessary to specify the clock resolution explicitly.
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94 This resolution involves two separate values, the numerator
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95 and the denominator. The result of dividing the numerator by
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96 the denominator should correspond to the number of
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97 nanoseconds between clock interrupts. For example a
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98 numerator of 1000000000 and a denominator of 100 means that
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99 there are 10000000 nanoseconds (or 10 milliseconds) between
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100 clock interrupts. Expressing the resolution as a fraction
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101 should minimize clock drift even for frequencies that cannot
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102 be expressed as a simple integer. For example a frequency of
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103 60Hz corresponds to a clock resolution of 16666666.66...
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104 nanoseconds. This can be expressed accurately as 1000000000
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105 over 60."
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106 }
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107
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108 cdl_option CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_DENOMINATOR {
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109 display "Clock resolution denominator"
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110 flavor data
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111 legal_values 1 to 0x7fffffff
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112 default_value 100
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113 description "
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114 If a non-default clock interrupt frequency is used then it
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115 is necessary to specify the clock resolution explicitly.
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116 This resolution involves two separate values, the numerator
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117 and the denominator. The result of dividing the numerator by
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118 the denominator should correspond to the number of
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119 nanoseconds between clock interrupts. For example a
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120 numerator of 1000000000 and a denominator of 100 means that
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121 there are 10000000 nanoseconds (or 10 milliseconds) between
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122 clock interrupts. Expressing the resolution as a fraction
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123 should minimize clock drift even for frequencies that cannot
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124 be expressed as a simple integer. For example a frequency of
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125 60Hz corresponds to a clock resolution of 16666666.66...
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126 nanoseconds. This can be expressed accurately as 1000000000
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127 over 60."
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128 }
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129 }
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130
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131 cdl_interface CYGINT_KERNEL_COUNTERS {
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132 requires 1 == CYGINT_KERNEL_COUNTERS
82
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133 no_define
76
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134 }
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135
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136 # NOTE: these option should really be a single enum.
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137 cdl_option CYGIMP_KERNEL_COUNTERS_SINGLE_LIST {
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138 display "Implement counters using a single list"
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139 default_value 1
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140 implements CYGINT_KERNEL_COUNTERS
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141 description "
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142 There are two different implementations of the counter
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143 objects. The first implementation stores all alarms in a
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144 single linked list. The alternative implementation uses a
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145 table of linked lists. A single list is more efficient in
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146 terms of memory usage and is generally adequate when the
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147 application only makes use of a small number of alarms."
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148 }
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149
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150 cdl_component CYGIMP_KERNEL_COUNTERS_MULTI_LIST {
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151 display "Implement counters using a table of lists"
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152 default_value 0
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153 implements CYGINT_KERNEL_COUNTERS
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154 description "
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155 There are two different implementations of the counter
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156 objects. The first implementation stores all alarms in a
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157 single linked list. The alternative implementation uses a
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158 table of linked lists, with the size of the table being a
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159 separate configurable option. For more complicated
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160 operations it is better to have a table of lists since this
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161 reduces the amount of computation whenever the timer goes
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162 off. Assuming a table size of 8 (the default value) on
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163 average the timer code will only need to check 1/8 of the
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164 pending alarms instead of all of them."
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165
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166 cdl_option CYGNUM_KERNEL_COUNTERS_MULTI_LIST_SIZE {
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167 display "Size of counter list table"
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168 flavor data
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169 legal_values 1 to 1024
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170 default_value 8
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171 description "
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172 If counters are implemented using an array of linked lists
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173 then this option controls the size of the array. A larger
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174 size reduces the amount of computation that needs to take
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175 place whenever the timer goes off, but requires extra
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176 memory."
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177 }
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178 }
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179
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180 cdl_option CYGIMP_KERNEL_COUNTERS_SORT_LIST {
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181 display "Sort the counter list"
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182 default_value 0
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183 description "
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184 Sorting the counter lists reduces the amount of work that
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185 has to be done when a counter tick is processed, since the
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186 next alarm to expire is always at the front of the list.
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187 However, it makes adding an alarm to the list more expensive
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188 since a search must be done for the correct place to put it.
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189 Many alarms are used to implement timeouts, which seldom trigger,
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190 so it is worthwhile optimizing this case. For this reason
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191 sorted list are disabled by default."
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192 }
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193
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194 cdl_option CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY {
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195 display "Measure real-time \[clock\] interrupt latency"
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196 requires CYGVAR_KERNEL_COUNTERS_CLOCK
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197 default_value 0
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198 description "
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199 Measure the interrupt latency as seen by the real-time clock
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200 timer interrupt. This requires hardware support, defined by
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201 the HAL_CLOCK_LATENCY() macro."
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202 }
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203
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204 cdl_option CYGVAR_KERNEL_COUNTERS_CLOCK_DSR_LATENCY {
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205 display "Measure real-time \[clock\] DSR latency"
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206 requires CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY
90
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207 default_value CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY
76
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208 description "
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209 Measure the DSR latency as seen by the real-time clock
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210 timer interrupt. This requires hardware support, defined by
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211 the HAL_CLOCK_LATENCY() macro."
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212 }
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213
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214 cdl_option CYGNUM_KERNEL_COUNTERS_RTC_RESOLUTION {
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215 display "RTC resolution"
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216 flavor data
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217 calculated { CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE ? \
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218 "{CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_NUMERATOR, \
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219 CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_DENOMINATOR}" \
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220 : "{CYGNUM_HAL_RTC_NUMERATOR, CYGNUM_HAL_RTC_DENOMINATOR}"}
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221 description "
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222 This option automatically defines the tuple which is used to
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223 initialize the RTC resolution, consisting of a numerator and
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224 denominator. For more information, see the option to
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225 override default clock settings
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226 (CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE) and associated options."
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227 }
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228
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229 cdl_option CYGNUM_KERNEL_COUNTERS_RTC_PERIOD {
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230 display "RTC period"
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231 flavor data
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232 calculated { CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE ? \
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233 "CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_PERIOD" \
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234 : "CYGNUM_HAL_RTC_PERIOD"}
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235 description "
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236 This option automatically defines the RTC period to be used in
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237 setting the system clock hardware. For more information, see the
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238 option to override default clock settings
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239 (CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE) and associated options."
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240 }
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241