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* Added execute permissions to files missed in conversion from CVS
author alexs
date Thu, 26 Mar 2009 20:39:18 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 # interrupts.cdl
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4 #
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5 # configuration data related to kernel interrupt handling
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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): bartv
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43 # Original data: nickg
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44 # Contributors:
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45 # Date: 1999-06-13
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46 #
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47 #####DESCRIPTIONEND####
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48 #
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49 # ====================================================================
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50
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51 # NOTE: the choice of list vs table should not be two separate
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52 # options. There is a single option which must have one of
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53 # two legal values.
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54 cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS {
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55 display "Use delayed service routines (DSRs)"
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56 default_value 1
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57 description "
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58 In eCos the recommended way to handle device interrupts is to
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59 do a minimum amount of work inside the low level interrupt
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60 handler itself, and instead do as much as possible in a
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61 Delayed Service Routine or DSR. If an application does not
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62 make use of DSRs directly or indirectly then it is possible
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63 to disable the DSR support completely, which reduces the
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64 overheads of context switches and interrupt handling. Note
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65 that the kernel real-time clock makes use of DSRs, as do many
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66 of the device drivers. "
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67
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68 cdl_interface CYGINT_KERNEL_INTERRUPTS_DSRS {
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69 requires 1 == CYGINT_KERNEL_INTERRUPTS_DSRS
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70 no_define
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71 }
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72
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73 # NOTE: the choice of list vs table should not be two separate
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74 # options. There is a single option which must have one of
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75 # two legal values.
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76 cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS_LIST {
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77 display "Use linked lists for DSRs"
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78 default_value 1
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79 implements CYGINT_KERNEL_INTERRUPTS_DSRS
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80 description "
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81 When DSR support is enabled the kernel must keep track of all
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82 the DSRs that are pending. This information can be kept in a
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83 fixed-size table or in a linked list. The list implementation
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84 requires that the kernel disable interrupts for a very short
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85 period of time outside interrupt handlers, but there is no
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86 possibility of a table overflow occurring."
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87
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88 cdl_option CYGSEM_KERNEL_INTERRUPTS_DSRS_LIST_FIFO {
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89 display "Schedule DSRs in FIFO order"
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90 flavor bool
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91 default_value 1
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92 description "When this option is set, DSRs are scheduled
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93 in the natural FIFO (first in, first out) order,
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94 otherwise they are scheduled in LIFO (last in, first
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95 out) order. Applications should not rely on any
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96 particular order of scheduling of DSRs. LIFO
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97 scheduling is kept for backward compatibility only and
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98 is not recommended as it may lead to high (up to 2
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99 times higher then FIFO) IRQ-to-DSR latencies at some
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100 (typically rare) conditions. If unsure, leave this set."
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101 }
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102
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103 }
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104
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105 cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS_TABLE {
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106 display "Use fixed-size table for DSRs"
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107 default_value 0
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108 implements CYGINT_KERNEL_INTERRUPTS_DSRS
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109 description "
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110 When DSR support is enabled the kernel must keep track of all
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111 the DSRs that are pending. This information can be kept in a
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112 fixed-size table or in a linked list. The table
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113 implementation involves a very small risk of overflow at
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114 run-time if a given interrupt source is able to have more
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115 than one pending DSR. However it has the advantage that
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116 the kernel does not need to disable interrupts outside
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117 interrupt handlers."
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118
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119 cdl_option CYGNUM_KERNEL_INTERRUPTS_DSRS_TABLE_SIZE {
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120 display "Number of entries in fixed-size DSR table"
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121 flavor data
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122 legal_values 2 to 1024
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123 default_value 32
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124 description "
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125 When DSR support is enabled the kernel must keep track of all
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126 the DSRs that are pending. One approach involves a fixed-size
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127 table, which involves a very small risk of overflow at
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128 run-time. By increasing the table size it is possible to reduce
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129 this risk."
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130 }
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131 }
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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132
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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133 cdl_option CYGIMP_KERNEL_INTERRUPTS_CHAIN {
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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134 display "Chain all interrupts together"
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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135 requires CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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136 default_value 0
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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137 description "
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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138 Interrupts can be attached to vectors either singly, or be
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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139 chained together. The latter is necessary if there is no way
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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140 of discovering which device has interrupted without
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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141 inspecting the device itself. It can also reduce the amount
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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142 of RAM needed for interrupt decoding tables and code."
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143 }
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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144 }