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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 8db735631ddb
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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 # ====================================================================
208
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8 #####ECOSGPLCOPYRIGHTBEGIN####
210
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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 Red Hat, 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 version.
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16 ##
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17 ## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 ## WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 ## for more details.
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21 ##
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22 ## You should have received a copy of the GNU General Public License along
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23 ## with eCos; if not, write to the Free Software Foundation, Inc.,
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24 ## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 ##
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26 ## As a special exception, if other files instantiate templates or use macros
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27 ## or inline functions from this file, or you compile this file and link it
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28 ## with other works to produce a work based on this file, this file does not
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29 ## by itself cause the resulting work to be covered by the GNU General Public
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30 ## License. However the source code for this file must still be made available
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31 ## in accordance with section (3) of the GNU General Public License.
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32 ##
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33 ## This exception does not invalidate any other reasons why a work based on
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34 ## this file might be covered by the GNU General Public License.
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35 ##
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36 ## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 ## at http://sources.redhat.com/ecos/ecos-license/
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38 ## -------------------------------------------
208
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39 #####ECOSGPLCOPYRIGHTEND####
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40 # ====================================================================
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41 ######DESCRIPTIONBEGIN####
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42 #
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43 # Author(s): jskov
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44 # Original data: nickg
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45 # Contributors:
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46 # Date: 1999-07-05
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47 #
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48 #####DESCRIPTIONEND####
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49 #
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50 # ====================================================================
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51
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52 cdl_option CYGVAR_KERNEL_COUNTERS_CLOCK {
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53 display "Provide real-time clock"
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54 requires CYGIMP_KERNEL_INTERRUPTS_DSRS
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55 default_value 1
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56 description "
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57 On all current target systems the kernel can provide a
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58 real-time clock. This clock serves two purposes. First it is
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59 necessary to support clock and alarm related functions.
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60 Second it is needed to implement timeslicing in some of the
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61 schedulers including the mlqueue scheduler. If the
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62 application does not require any of these facilities then it
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63 is possible to disable the real time clock support
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64 completely."
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65 }
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66
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67 cdl_component CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE {
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68 display "Override default clock settings"
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69 requires CYGVAR_KERNEL_COUNTERS_CLOCK
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70 default_value 0
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71 description "
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72 The kernel has default settings for the clock interrupt
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73 frequency. These settings will vary from platform to
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74 platform, but typically there will be a 100 clock interrupts
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75 every second. It is possible to change this frequency, but
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76 it requires some knowledge of the target hardware."
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77
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78 cdl_option CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_PERIOD {
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79 display "Clock hardware initialization value"
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80 flavor data
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81 legal_values 1 to 0x7fffffff
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82 default_value 9999
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83 description "
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84 During system initialization this value is used to initialize
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85 the clock hardware. The exact meaning of the value and the
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86 range of legal values therefore depends on the target hardware,
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87 and the hardware documentation should be consulted for further
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88 details. In addition the clock resolution numerator and
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89 denominator values should be updated. Typical values for
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90 this option would be 150000 on the MN10300 stdeval1 board,
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91 15625 on the tx39 jmr3904 board, and 20833 on the powerpc
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92 cogent board."
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93 }
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94
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95 cdl_option CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_NUMERATOR {
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96 display "Clock resolution numerator"
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97 flavor data
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98 legal_values 1 to 0x7fffffff
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99 default_value 1000000000
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100 description "
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101 If a non-default clock interrupt frequency is used then it
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102 is necessary to specify the clock resolution explicitly.
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103 This resolution involves two separate values, the numerator
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104 and the denominator. The result of dividing the numerator by
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105 the denominator should correspond to the number of
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106 nanoseconds between clock interrupts. For example a
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107 numerator of 1000000000 and a denominator of 100 means that
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108 there are 10000000 nanoseconds (or 10 milliseconds) between
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109 clock interrupts. Expressing the resolution as a fraction
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110 should minimize clock drift even for frequencies that cannot
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111 be expressed as a simple integer. For example a frequency of
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112 60Hz corresponds to a clock resolution of 16666666.66...
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113 nanoseconds. This can be expressed accurately as 1000000000
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114 over 60."
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115 }
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116
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117 cdl_option CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_DENOMINATOR {
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118 display "Clock resolution denominator"
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119 flavor data
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120 legal_values 1 to 0x7fffffff
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121 default_value 100
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122 description "
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123 If a non-default clock interrupt frequency is used then it
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124 is necessary to specify the clock resolution explicitly.
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125 This resolution involves two separate values, the numerator
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126 and the denominator. The result of dividing the numerator by
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127 the denominator should correspond to the number of
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128 nanoseconds between clock interrupts. For example a
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129 numerator of 1000000000 and a denominator of 100 means that
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130 there are 10000000 nanoseconds (or 10 milliseconds) between
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131 clock interrupts. Expressing the resolution as a fraction
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132 should minimize clock drift even for frequencies that cannot
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133 be expressed as a simple integer. For example a frequency of
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134 60Hz corresponds to a clock resolution of 16666666.66...
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135 nanoseconds. This can be expressed accurately as 1000000000
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136 over 60."
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137 }
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138 }
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139
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140 cdl_interface CYGINT_KERNEL_COUNTERS {
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141 requires 1 == CYGINT_KERNEL_COUNTERS
82
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142 no_define
76
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143 }
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144
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145 # NOTE: these option should really be a single enum.
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146 cdl_option CYGIMP_KERNEL_COUNTERS_SINGLE_LIST {
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147 display "Implement counters using a single list"
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148 default_value 1
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149 implements CYGINT_KERNEL_COUNTERS
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150 description "
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151 There are two different implementations of the counter
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152 objects. The first implementation stores all alarms in a
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153 single linked list. The alternative implementation uses a
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154 table of linked lists. A single list is more efficient in
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155 terms of memory usage and is generally adequate when the
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156 application only makes use of a small number of alarms."
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157 }
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158
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159 cdl_component CYGIMP_KERNEL_COUNTERS_MULTI_LIST {
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160 display "Implement counters using a table of lists"
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161 default_value 0
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162 implements CYGINT_KERNEL_COUNTERS
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163 description "
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164 There are two different implementations of the counter
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165 objects. The first implementation stores all alarms in a
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166 single linked list. The alternative implementation uses a
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167 table of linked lists, with the size of the table being a
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168 separate configurable option. For more complicated
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169 operations it is better to have a table of lists since this
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170 reduces the amount of computation whenever the timer goes
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171 off. Assuming a table size of 8 (the default value) on
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172 average the timer code will only need to check 1/8 of the
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173 pending alarms instead of all of them."
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174
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175 cdl_option CYGNUM_KERNEL_COUNTERS_MULTI_LIST_SIZE {
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176 display "Size of counter list table"
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177 flavor data
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178 legal_values 1 to 1024
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179 default_value 8
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180 description "
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181 If counters are implemented using an array of linked lists
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182 then this option controls the size of the array. A larger
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183 size reduces the amount of computation that needs to take
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184 place whenever the timer goes off, but requires extra
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185 memory."
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186 }
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187 }
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188
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189 cdl_option CYGIMP_KERNEL_COUNTERS_SORT_LIST {
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190 display "Sort the counter list"
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191 default_value 0
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192 description "
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193 Sorting the counter lists reduces the amount of work that
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194 has to be done when a counter tick is processed, since the
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195 next alarm to expire is always at the front of the list.
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196 However, it makes adding an alarm to the list more expensive
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197 since a search must be done for the correct place to put it.
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198 Many alarms are used to implement timeouts, which seldom trigger,
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199 so it is worthwhile optimizing this case. For this reason
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200 sorted list are disabled by default."
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201 }
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202
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203 cdl_option CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY {
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204 display "Measure real-time \[clock\] interrupt latency"
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205 requires CYGVAR_KERNEL_COUNTERS_CLOCK
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206 default_value 0
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207 description "
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208 Measure the interrupt latency as seen by the real-time clock
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209 timer interrupt. This requires hardware support, defined by
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210 the HAL_CLOCK_LATENCY() macro."
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211 }
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212
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213 cdl_option CYGVAR_KERNEL_COUNTERS_CLOCK_DSR_LATENCY {
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214 display "Measure real-time \[clock\] DSR latency"
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215 requires CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY
90
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216 default_value CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY
76
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217 description "
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218 Measure the DSR latency as seen by the real-time clock
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219 timer interrupt. This requires hardware support, defined by
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220 the HAL_CLOCK_LATENCY() macro."
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221 }
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222
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223 cdl_option CYGNUM_KERNEL_COUNTERS_RTC_RESOLUTION {
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224 display "RTC resolution"
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225 flavor data
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226 calculated { CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE ? \
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227 "{CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_NUMERATOR, \
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228 CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_DENOMINATOR}" \
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229 : "{CYGNUM_HAL_RTC_NUMERATOR, CYGNUM_HAL_RTC_DENOMINATOR}"}
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230 description "
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231 This option automatically defines the tuple which is used to
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232 initialize the RTC resolution, consisting of a numerator and
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233 denominator. For more information, see the option to
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234 override default clock settings
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235 (CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE) and associated options."
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236 }
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237
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238 cdl_option CYGNUM_KERNEL_COUNTERS_RTC_PERIOD {
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239 display "RTC period"
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240 flavor data
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241 calculated { CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE ? \
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242 "CYGNUM_KERNEL_COUNTERS_CLOCK_OVERRIDE_PERIOD" \
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243 : "CYGNUM_HAL_RTC_PERIOD"}
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244 description "
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245 This option automatically defines the RTC period to be used in
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246 setting the system clock hardware. For more information, see the
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247 option to override default clock settings
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248 (CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE) and associated options."
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249 }
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250