1 | /** |
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2 | * @file rtems/score/apiext.h |
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3 | * |
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4 | * This is the API Extensions Handler. |
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5 | */ |
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6 | |
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7 | /* |
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8 | * COPYRIGHT (c) 1989-2004. |
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9 | * On-Line Applications Research Corporation (OAR). |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.com/license/LICENSE. |
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14 | * |
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15 | * $Id$ |
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16 | */ |
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17 | |
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18 | #ifndef _RTEMS_SCORE_APIEXT_H |
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19 | #define _RTEMS_SCORE_APIEXT_H |
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20 | |
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21 | /** |
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22 | * @defgroup ScoreAPIExtension API Extension Handler |
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23 | * |
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24 | * This group contains functionality which provides mechanisms for the |
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25 | * SuperCore to perform API specific actions without there being |
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26 | * "up-references" from the SuperCore to APIs. If these references |
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27 | * were allowed in the implementation, the cohesion would be too high |
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28 | * and adding an API would be more difficult. The SuperCore is supposed |
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29 | * to be largely independent of any API. |
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30 | */ |
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31 | /**@{*/ |
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32 | |
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33 | #include <rtems/score/chain.h> |
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34 | #include <rtems/score/thread.h> |
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35 | |
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36 | /** |
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37 | * This type defines the prototype of the Predriver Hook. |
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38 | */ |
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39 | typedef void (*API_extensions_Predriver_hook)(void); |
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40 | |
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41 | /** |
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42 | * This type defines the prototype of the Postdriver Hook. |
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43 | */ |
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44 | typedef void (*API_extensions_Postdriver_hook)(void); |
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45 | |
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46 | /** |
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47 | * This type defines the prototype of the Postswitch Hook. |
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48 | */ |
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49 | typedef void (*API_extensions_Postswitch_hook)( |
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50 | Thread_Control * |
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51 | ); |
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52 | |
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53 | /** |
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54 | * The control structure which defines the points at which an API |
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55 | * can add an extension to the system initialization thread. |
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56 | */ |
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57 | typedef struct { |
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58 | /** This field allows this structure to be used with the Chain Handler. */ |
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59 | Chain_Node Node; |
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60 | /** |
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61 | * This field is the callout invoked during RTEMS initialization after |
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62 | * RTEMS data structures are initialized before device driver initialization |
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63 | * has occurred. |
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64 | * |
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65 | * @note If this field is NULL, no extension is invoked. |
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66 | */ |
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67 | API_extensions_Predriver_hook predriver_hook; |
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68 | /** |
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69 | * This field is the callout invoked during RTEMS initialization after |
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70 | * RTEMS data structures and device driver initialization has occurred |
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71 | * but before multitasking is initiated. |
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72 | * |
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73 | * @note If this field is NULL, no extension is invoked. |
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74 | */ |
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75 | API_extensions_Postdriver_hook postdriver_hook; |
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76 | /** |
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77 | * This field is the callout invoked during each context switch |
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78 | * in the context of the heir thread. |
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79 | * |
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80 | * @note If this field is NULL, no extension is invoked. |
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81 | */ |
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82 | API_extensions_Postswitch_hook postswitch_hook; |
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83 | } API_extensions_Control; |
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84 | |
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85 | /** |
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86 | * This is the list of API extensions to the system initialization. |
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87 | */ |
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88 | SCORE_EXTERN Chain_Control _API_extensions_List; |
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89 | |
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90 | /** |
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91 | * This routine initializes the API extension handler. |
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92 | */ |
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93 | void _API_extensions_Initialization( void ); |
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94 | |
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95 | /** |
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96 | * This routine adds an extension to the active set of API extensions. |
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97 | * |
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98 | * @param the_extension (in) is the extension set to add. |
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99 | */ |
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100 | void _API_extensions_Add( |
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101 | API_extensions_Control *the_extension |
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102 | ); |
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103 | |
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104 | /** |
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105 | * This routine executes all of the predriver callouts. |
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106 | */ |
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107 | void _API_extensions_Run_predriver( void ); |
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108 | |
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109 | /** |
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110 | * This routine executes all of the postdriver callouts. |
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111 | */ |
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112 | void _API_extensions_Run_postdriver( void ); |
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113 | |
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114 | /** |
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115 | * This routine executes all of the post context switch callouts. |
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116 | */ |
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117 | void _API_extensions_Run_postswitch( void ); |
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118 | |
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119 | /**@}*/ |
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120 | |
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121 | #endif |
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122 | /* end of include file */ |
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