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annotate packages/kernel/current/cdl/interrupts.cdl @ 82:6736c52df507 ecos-sw-2000-04-14

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Merge from eCos master repository on 2000-04-14-13:35:46-BST
author jlarmour
date Tue, 18 Apr 2000 21:51:55 +0000
parents 435cced73e2f
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 # 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 #####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): bartv
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35 # Original data: nickg
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36 # Contributors:
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37 # Date: 1999-06-13
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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 # NOTE: the choice of list vs table should not be two separate
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44 # options. There is a single option which must have one of
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45 # two legal values.
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46 cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS {
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47 display "Use delayed service routines (DSRs)"
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48 default_value 1
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49 description "
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50 In eCos the recommended way to handle device interrupts is to
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51 do a minimum amount of work inside the low level interrupt
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52 handler itself, and instead do as much as possible in a
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53 Delayed Service Routine or DSR. If an application does not
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54 make use of DSRs directly or indirectly then it is possible
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55 to disable the DSR support completely, which reduces the
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56 overheads of context switches and interrupt handling. Note
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57 that the kernel real-time clock makes use of DSRs, as do many
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58 of the device drivers. "
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59
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60 cdl_interface CYGINT_KERNEL_INTERRUPTS_DSRS {
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61 requires 1 == CYGINT_KERNEL_INTERRUPTS_DSRS
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62 no_define
76
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63 }
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64
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65 # NOTE: the choice of list vs table should not be two separate
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66 # options. There is a single option which must have one of
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67 # two legal values.
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68 cdl_option CYGIMP_KERNEL_INTERRUPTS_DSRS_LIST {
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69 display "Use linked lists for DSRs"
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70 default_value 1
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71 implements CYGINT_KERNEL_INTERRUPTS_DSRS
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72 description "
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73 When DSR support is enabled the kernel must keep track of all
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74 the DSRs that are pending. This information can be kept in a
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75 fixed-size table or in a linked list. The list implementation
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76 requires that the kernel disable interrupts for a very short
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77 period of time outside interrupt handlers, but there is no
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78 possibility of a table overflow occurring."
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79 }
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80
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81 cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS_TABLE {
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82 display "Use fixed-size table for DSRs"
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83 default_value 0
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84 implements CYGINT_KERNEL_INTERRUPTS_DSRS
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85 description "
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86 When DSR support is enabled the kernel must keep track of all
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87 the DSRs that are pending. This information can be kept in a
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88 fixed-size table or in a linked list. The table
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89 implementation involves a very small risk of overflow at
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90 run-time if a given interrupt source is able to have more
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91 than one pending DSR. However it has the advantage that
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92 the kernel does not need to disable interrupts outside
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93 interrupt handlers."
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94
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95 cdl_option CYGNUM_KERNEL_INTERRUPTS_DSRS_TABLE_SIZE {
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96 display "Number of entries in fixed-size DSR table"
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97 flavor data
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98 legal_values 2 to 1024
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99 default_value 32
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100 description "
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101 When DSR support is enabled the kernel must keep track of all
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102 the DSRs that are pending. One approach involves a fixed-size
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103 table, which involves a very small risk of overflow at
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104 run-time. By increasing the table size it is possible to reduce
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105 this risk."
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106 }
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107 }
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108
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109 cdl_option CYGIMP_KERNEL_INTERRUPTS_CHAIN {
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110 display "Chain all interrupts together"
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111 requires CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
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112 default_value 0
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113 description "
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114 Interrupts can be attached to vectors either singly, or be
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115 chained together. The latter is necessary if there is no way
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116 of discovering which device has interrupted without
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117 inspecting the device itself. It can also reduce the amount
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118 of RAM needed for interrupt decoding tables and code."
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119 }
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120 }