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annotate packages/kernel/current/cdl/interrupts.cdl @ 1737:dcf02dfe567d

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* src/flash.c (do_flash_init): Fix compiler warning about an unused variable.
author asl
date Thu, 07 Oct 2004 08:13:49 +0000
parents d2c90368aeef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 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): bartv
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44 # Original data: nickg
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45 # Contributors:
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46 # Date: 1999-06-13
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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 # NOTE: the choice of list vs table should not be two separate
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53 # options. There is a single option which must have one of
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54 # two legal values.
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55 cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS {
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56 display "Use delayed service routines (DSRs)"
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57 default_value 1
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58 description "
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59 In eCos the recommended way to handle device interrupts is to
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60 do a minimum amount of work inside the low level interrupt
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61 handler itself, and instead do as much as possible in a
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62 Delayed Service Routine or DSR. If an application does not
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63 make use of DSRs directly or indirectly then it is possible
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64 to disable the DSR support completely, which reduces the
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65 overheads of context switches and interrupt handling. Note
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66 that the kernel real-time clock makes use of DSRs, as do many
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67 of the device drivers. "
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68
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69 cdl_interface CYGINT_KERNEL_INTERRUPTS_DSRS {
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70 requires 1 == CYGINT_KERNEL_INTERRUPTS_DSRS
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71 no_define
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72 }
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73
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74 # NOTE: the choice of list vs table should not be two separate
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75 # options. There is a single option which must have one of
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76 # two legal values.
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77 cdl_option CYGIMP_KERNEL_INTERRUPTS_DSRS_LIST {
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78 display "Use linked lists for DSRs"
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79 default_value 1
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80 implements CYGINT_KERNEL_INTERRUPTS_DSRS
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81 description "
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82 When DSR support is enabled the kernel must keep track of all
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83 the DSRs that are pending. This information can be kept in a
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84 fixed-size table or in a linked list. The list implementation
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85 requires that the kernel disable interrupts for a very short
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86 period of time outside interrupt handlers, but there is no
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87 possibility of a table overflow occurring."
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88 }
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89
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90 cdl_component CYGIMP_KERNEL_INTERRUPTS_DSRS_TABLE {
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91 display "Use fixed-size table for DSRs"
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92 default_value 0
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93 implements CYGINT_KERNEL_INTERRUPTS_DSRS
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94 description "
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95 When DSR support is enabled the kernel must keep track of all
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96 the DSRs that are pending. This information can be kept in a
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97 fixed-size table or in a linked list. The table
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98 implementation involves a very small risk of overflow at
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99 run-time if a given interrupt source is able to have more
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100 than one pending DSR. However it has the advantage that
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101 the kernel does not need to disable interrupts outside
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102 interrupt handlers."
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103
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104 cdl_option CYGNUM_KERNEL_INTERRUPTS_DSRS_TABLE_SIZE {
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105 display "Number of entries in fixed-size DSR table"
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106 flavor data
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107 legal_values 2 to 1024
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108 default_value 32
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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. One approach involves a fixed-size
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112 table, which involves a very small risk of overflow at
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113 run-time. By increasing the table size it is possible to reduce
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114 this risk."
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115 }
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116 }
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117
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118 cdl_option CYGIMP_KERNEL_INTERRUPTS_CHAIN {
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119 display "Chain all interrupts together"
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120 requires CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
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121 default_value 0
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122 description "
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123 Interrupts can be attached to vectors either singly, or be
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124 chained together. The latter is necessary if there is no way
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125 of discovering which device has interrupted without
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126 inspecting the device itself. It can also reduce the amount
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127 of RAM needed for interrupt decoding tables and code."
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128 }
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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