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annotate packages/kernel/current/cdl/interrupts.cdl @ 76:435cced73e2f ecos-v1_3_1-release

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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
author jlarmour
date Tue, 28 Mar 2000 14:10:45 +0000
parents
children 6736c52df507
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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 }
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63
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64 # NOTE: the choice of list vs table should not be two separate
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65 # options. There is a single option which must have one of
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66 # two legal values.
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67 cdl_option CYGIMP_KERNEL_INTERRUPTS_DSRS_LIST {
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68 display "Use linked lists for DSRs"
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69 default_value 1
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70 implements CYGINT_KERNEL_INTERRUPTS_DSRS
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71 description "
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72 When DSR support is enabled the kernel must keep track of all
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73 the DSRs that are pending. This information can be kept in a
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74 fixed-size table or in a linked list. The list implementation
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75 requires that the kernel disable interrupts for a very short
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76 period of time outside interrupt handlers, but there is no
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77 possibility of a table overflow occurring."
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78 }
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79
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80 cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS_TABLE {
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81 display "Use fixed-size table for DSRs"
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82 default_value 0
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83 implements CYGINT_KERNEL_INTERRUPTS_DSRS
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84 description "
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85 When DSR support is enabled the kernel must keep track of all
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86 the DSRs that are pending. This information can be kept in a
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87 fixed-size table or in a linked list. The table
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88 implementation involves a very small risk of overflow at
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89 run-time if a given interrupt source is able to have more
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90 than one pending DSR. However it has the advantage that
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91 the kernel does not need to disable interrupts outside
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92 interrupt handlers."
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93
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94 cdl_option CYGNUM_KERNEL_INTERRUPTS_DSRS_TABLE_SIZE {
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95 display "Number of entries in fixed-size DSR table"
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96 flavor data
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97 legal_values 2 to 1024
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98 default_value 32
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99 description "
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100 When DSR support is enabled the kernel must keep track of all
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101 the DSRs that are pending. One approach involves a fixed-size
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102 table, which involves a very small risk of overflow at
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103 run-time. By increasing the table size it is possible to reduce
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104 this risk."
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105 }
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106 }
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107
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108 cdl_option CYGIMP_KERNEL_INTERRUPTS_CHAIN {
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109 display "Chain all interrupts together"
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110 requires CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
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111 default_value 0
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112 description "
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113 Interrupts can be attached to vectors either singly, or be
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114 chained together. The latter is necessary if there is no way
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115 of discovering which device has interrupted without
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116 inspecting the device itself. It can also reduce the amount
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117 of RAM needed for interrupt decoding tables and code."
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118 }
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119 }