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annotate packages/hal/common/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 511f4dc167f6
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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 # HAL interrupt configuration data
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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): jskov
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35 # Original data: nickg,jskov,jlarmour
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36 # Contributors:
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37 # Date: 1999-07-02
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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 cdl_option CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK {
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44 display "Use separate stack for interrupts"
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45 default_value 1
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46 description "
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47 When an interrupt occurs this interrupt can be handled either
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48 on the current stack or on a separate stack maintained by the
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49 HAL. Using a separate stack requires a small number of extra
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50 instructions in the interrupt handling code, but it has the
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51 advantage that it is no longer necessary to allow extra space
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52 in every thread stack for the interrupt handlers. The amount
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53 of extra space required depends on the interrupt handlers
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54 that are being used."
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55 }
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56
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57 # NOTE: various parts of the system such as device drivers should
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58 # impose lower bounds on this. The actual lower bound depends on a
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59 # platform-specific value for startup overheads, and the minimum
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60 # sizes specified by the various device drivers. If interrupts are
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61 # not handled on a separate stack then only the startup overheads
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62 # are significant. If nested interrupts are disabled then the
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63 # lower bound is the maximum of the individual sizes, otherwise
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64 # it is the sum of these sizes. It is not currently possible to
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65 # express a relationship like this.
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66 cdl_option CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE {
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67 display "Interrupt stack size"
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68 flavor data
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69 default_value 4096
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70 legal_values 1024 to 1048576
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71 description "
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72 This configuration option specifies the stack size in bytes
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73 for the interrupt stack. Typically this should be a multiple
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74 of 16, but the exact requirements will vary from architecture
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75 to architecture. The interrupt stack serves two separate
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76 purposes. It is used as the stack during system
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77 initialization. In addition, if the interrupt system is
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78 configured to use a separate stack then all interrupts will
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79 be processed on this stack. The exact memory requirements
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80 will vary from application to application, and will depend
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81 heavily on whether or not other interrupt-related options,
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82 for example nested interrupts, are enabled."
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83 }
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84
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85 cdl_option CYGSEM_HAL_COMMON_INTERRUPTS_ALLOW_NESTING {
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86 display "Allow nested interrupts"
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87 default_value 0
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88 description "
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89 When an interrupt occurs the HAL interrupt handling code can
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90 either leave interrupts disabled for the duration of the
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91 interrupt handling code, or by doing some extra work it can
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92 reenable interrupts before invoking the interrupt handler and
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93 thus allow nested interrupts to happen. If all the interrupt
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94 handlers being used are small and do not involve any loops
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95 then it is usually better to disallow nested interrupts.
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96 However if any of the interrupt handlers are more complicated
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97 than nested interrupts will usually be required."
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98 }
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99
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100 cdl_option CYGDBG_HAL_COMMON_INTERRUPTS_SAVE_MINIMUM_CONTEXT {
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101 display "Save minimum context on interrupt"
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102 default_value 1
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103 description "
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104 The HAL interrupt handling code can exploit the calling conventions
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105 defined for a given architecture to reduce the amount of state
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106 that has to be saved. Generally this improves performance and
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107 reduces code size. However it can make source-level debugging
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108 more difficult."
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109 }
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110
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111 cdl_option CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN {
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112 display "Chain all interrupts together"
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113 default_value 0
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114 description "
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115 Interrupts can be attached to vectors either singly, or be
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116 chained together. The latter is necessary if there is no way
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117 of discovering which device has interrupted without
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118 inspecting the device itself. It can also reduce the amount
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119 of RAM needed for interrupt decoding tables and code."
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120 }
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121
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122 cdl_option CYGIMP_HAL_COMMON_INTERRUPTS_IGNORE_SPURIOUS {
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123 display "Ignore spurious \[fleeting\] interrupts"
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124 default_value 0
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125 description "
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126 On some hardware, interrupt sources may not be de-bounced or
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127 de-glitched. Rather than try to handle these interrupts (no
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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128 handling may be possible), this option allows the HAL to simply
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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129 ignore them. In most cases, if the interrupt is real it will
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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130 reoccur in a detectable form."
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
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131 }