FreeCalypso > hg > freecalypso-citrine

annotate nucleus/iof.c @ 4:1a22dd26c8a4

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L1/include/l1_varex.h: same data section fix as in the LoCosto-based version
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 09 Jun 2016 00:53:13 +0000
parents 75a11d740a02
children
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1 /*************************************************************************/
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2 /* */
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3 /* Copyright Mentor Graphics Corporation 2002 */
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4 /* All Rights Reserved. */
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5 /* */
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6 /* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */
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7 /* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */
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8 /* SUBJECT TO LICENSE TERMS. */
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9 /* */
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10 /*************************************************************************/
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11
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12 /*************************************************************************/
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13 /* */
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14 /* FILE NAME VERSION */
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15 /* */
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16 /* iof.c Nucleus PLUS 1.14 */
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17 /* */
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18 /* COMPONENT */
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19 /* */
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20 /* IO - Input/Output Driver Management */
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21 /* */
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22 /* DESCRIPTION */
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23 /* */
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24 /* This file contains routines to obtain facts about the I/O Driver */
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25 /* Management component. */
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26 /* */
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27 /* DATA STRUCTURES */
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28 /* */
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29 /* None */
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30 /* */
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31 /* FUNCTIONS */
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32 /* */
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33 /* IOF_Established_Drivers Return total number of I/O */
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34 /* drivers */
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35 /* IOF_Driver_Pointers Return list of I/O driver */
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36 /* pointers */
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37 /* */
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38 /* DEPENDENCIES */
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39 /* */
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40 /* cs_extr.h Common Service functions */
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41 /* tc_extr.h Thread Control functions */
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42 /* io_extr.h I/O driver functions */
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43 /* hi_extr.h History functions */
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44 /* */
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45 /* HISTORY */
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46 /* */
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47 /* DATE REMARKS */
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48 /* */
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49 /* 03-01-1994 Initial version of I/O driver */
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50 /* fact service file, version 1.1 */
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51 /* */
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52 /* 03-18-1994 Verified version 1.1 */
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53 /* 04-17-1996 updated to version 1.2 */
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54 /* 03-24-1998 Released version 1.3 */
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55 /* 03-26-1999 Released 1.11m (new release */
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56 /* numbering scheme) */
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57 /* 04-17-2002 Released version 1.13m */
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58 /* 11-07-2002 Released version 1.14 */
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59 /*************************************************************************/
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60 #define NU_SOURCE_FILE
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61
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62
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63 #include "cs_extr.h" /* Common service functions */
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64 #include "tc_extr.h" /* Thread control functions */
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65 #include "io_extr.h" /* I/O driver functions */
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66 #include "hi_extr.h" /* History functions */
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67
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68 /* Define external inner-component global data references. */
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69
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70 extern CS_NODE *IOD_Created_Drivers_List;
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71 extern UNSIGNED IOD_Total_Drivers;
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72 extern TC_PROTECT IOD_List_Protect;
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73
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74
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75
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76 /*************************************************************************/
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77 /* */
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78 /* FUNCTION */
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79 /* */
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80 /* IOF_Established_Drivers */
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81 /* */
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82 /* DESCRIPTION */
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83 /* */
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84 /* This function returns the current number of established I/O */
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85 /* drivers. I/O drivers previously deleted are no longer */
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86 /* considered established. */
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87 /* */
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88 /* CALLED BY */
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89 /* */
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90 /* Application */
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91 /* */
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92 /* CALLS */
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93 /* */
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94 /* [TCT_Check_Stack] Stack checking function */
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95 /* */
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96 /* INPUTS */
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97 /* */
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98 /* None */
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99 /* */
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100 /* OUTPUTS */
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101 /* */
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102 /* IOD_Total_Drivers Number of established I/O */
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103 /* drivers */
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104 /* */
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105 /* HISTORY */
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106 /* */
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107 /* DATE REMARKS */
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108 /* */
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109 /* 03-01-1993 Created initial version 1.0 */
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110 /* 04-19-1993 Verified version 1.0 */
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111 /* 03-01-1994 Changed function interface, */
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112 /* resulting in version 1.1 */
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113 /* */
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diff changeset
114 /* 03-18-1994 Verified version 1.1 */
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diff changeset
115 /* */
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116 /*************************************************************************/
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117 UNSIGNED IOF_Established_Drivers(VOID)
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118 {
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diff changeset
119
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120
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121 #ifdef NU_ENABLE_STACK_CHECK
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122
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diff changeset
123 /* Call stack checking function to check for an overflow condition. */
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diff changeset
124 TCT_Check_Stack();
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125
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diff changeset
126 #endif
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127
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parents:
diff changeset
128 /* Return the number of established I/O drivers. */
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diff changeset
129 return(IOD_Total_Drivers);
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130 }
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131
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132
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133 /*************************************************************************/
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134 /* */
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135 /* FUNCTION */
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136 /* */
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diff changeset
137 /* IOF_Driver_Pointers */
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diff changeset
138 /* */
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diff changeset
139 /* DESCRIPTION */
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140 /* */
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parents:
diff changeset
141 /* This function builds a list of driver pointers, starting at the */
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parents:
diff changeset
142 /* specified location. The number of driver pointers placed in */
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parents:
diff changeset
143 /* the list is equivalent to the total number of drivers or the */
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parents:
diff changeset
144 /* maximum number of pointers specified in the call. */
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diff changeset
145 /* */
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parents:
diff changeset
146 /* CALLED BY */
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
147 /* */
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diff changeset
148 /* Application */
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diff changeset
149 /* */
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diff changeset
150 /* CALLS */
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parents:
diff changeset
151 /* */
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parents:
diff changeset
152 /* [TCT_Check_Stack] Stack checking function */
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diff changeset
153 /* TCT_Protect Protect created list */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 /* TCT_Unprotect Release protection */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 /* */
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parents:
diff changeset
156 /* INPUTS */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 /* */
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parents:
diff changeset
158 /* pointer_list Pointer to the list area */
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diff changeset
159 /* maximum_pointers Maximum number of pointers */
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parents:
diff changeset
160 /* */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 /* OUTPUTS */
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parents:
diff changeset
162 /* */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 /* pointers Number of I/O driver pointers*/
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parents:
diff changeset
164 /* placed in the list */
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parents:
diff changeset
165 /* */
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parents:
diff changeset
166 /* HISTORY */
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parents:
diff changeset
167 /* */
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diff changeset
168 /* DATE REMARKS */
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diff changeset
169 /* */
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diff changeset
170 /* 03-01-1993 Created initial version 1.0 */
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parents:
diff changeset
171 /* 04-19-1993 Verified version 1.0 */
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parents:
diff changeset
172 /* 08-09-1993 Corrected pointer retrieval */
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diff changeset
173 /* loop, resulting in version 1.0a */
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parents:
diff changeset
174 /* 08-09-1993 Verified version 1.0a */
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parents:
diff changeset
175 /* 03-01-1994 Changed function interface, */
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parents:
diff changeset
176 /* resulting in version 1.1 */
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diff changeset
177 /* */
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parents:
diff changeset
178 /* 03-18-1994 Verified version 1.1 */
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parents:
diff changeset
179 /* */
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diff changeset
180 /*************************************************************************/
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181 UNSIGNED IOF_Driver_Pointers(NU_DRIVER **pointer_list,
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parents:
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182 UNSIGNED maximum_pointers)
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parents:
diff changeset
183 {
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diff changeset
184 CS_NODE *node_ptr; /* Pointer to each NU_DRIVER */
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diff changeset
185 UNSIGNED pointers; /* Number of pointers in list*/
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186 NU_SUPERV_USER_VARIABLES
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diff changeset
187
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parents:
diff changeset
188 /* Switch to supervisor mode */
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parents:
diff changeset
189 NU_SUPERVISOR_MODE();
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diff changeset
190
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 #ifdef NU_ENABLE_STACK_CHECK
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diff changeset
192
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parents:
diff changeset
193 /* Call stack checking function to check for an overflow condition. */
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diff changeset
194 TCT_Check_Stack();
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diff changeset
195
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parents:
diff changeset
196 #endif
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diff changeset
197
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parents:
diff changeset
198 /* Initialize the number of pointers returned. */
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199 pointers = 0;
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parents:
diff changeset
200
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parents:
diff changeset
201 /* Protect against access to the list of created I/O drivers. */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 TCT_Protect(&IOD_List_Protect);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 /* Loop until all driver pointers are in the list or until the maximum
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 list size is reached. */
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parents:
diff changeset
206 node_ptr = IOD_Created_Drivers_List;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 while ((node_ptr) && (pointers < maximum_pointers))
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parents:
diff changeset
208 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 /* Place the node into the destination list. */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 *pointer_list++ = (NU_DRIVER *) node_ptr;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 /* Increment the pointers variable. */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 pointers++;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 /* Position the node pointer to the next node. */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 node_ptr = node_ptr -> cs_next;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 /* Determine if the pointer is at the head of the list. */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 if (node_ptr == IOD_Created_Drivers_List)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 /* The list search is complete. */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 node_ptr = NU_NULL;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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226 /* Release protection against access to the list of created drivers. */
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227 TCT_Unprotect();
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228
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229 /* Return to user mode */
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230 NU_USER_MODE();
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231
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232 /* Return the number of pointers in the list. */
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233 return(pointers);
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234 }
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235
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237
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239
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240