1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_blkdev |
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5 | * |
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6 | * Block device management. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
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11 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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12 | * |
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13 | * @(#) $Id$ |
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14 | */ |
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15 | |
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16 | #if HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | |
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20 | #include <errno.h> |
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21 | #include <string.h> |
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22 | |
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23 | #include <rtems.h> |
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24 | #include <rtems/libio.h> |
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25 | #include <sys/ioctl.h> |
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26 | |
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27 | #include "rtems/diskdevs.h" |
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28 | #include "rtems/bdbuf.h" |
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29 | |
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30 | /* rtems_blkdev_generic_read -- |
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31 | * Generic block device read primitive. Implemented using block device |
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32 | * buffer management primitives. |
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33 | */ |
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34 | rtems_device_driver |
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35 | rtems_blkdev_generic_read( |
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36 | rtems_device_major_number major __attribute__((unused)), |
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37 | rtems_device_minor_number minor __attribute__((unused)), |
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38 | void * arg) |
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39 | { |
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40 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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41 | rtems_libio_rw_args_t *args = arg; |
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42 | rtems_libio_t *iop = args->iop; |
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43 | rtems_disk_device *dd = iop->data1; |
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44 | uint32_t block_size = dd->block_size; |
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45 | char *buf = args->buffer; |
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46 | uint32_t count = args->count; |
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47 | rtems_blkdev_bnum block = (rtems_blkdev_bnum) (args->offset / block_size); |
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48 | uint32_t blkofs = (uint32_t) (args->offset % block_size); |
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49 | |
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50 | args->bytes_moved = 0; |
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51 | |
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52 | while (count > 0) |
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53 | { |
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54 | rtems_bdbuf_buffer *diskbuf; |
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55 | uint32_t copy; |
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56 | |
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57 | rc = rtems_bdbuf_read(dd, block, &diskbuf); |
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58 | if (rc != RTEMS_SUCCESSFUL) |
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59 | break; |
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60 | copy = block_size - blkofs; |
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61 | if (copy > count) |
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62 | copy = count; |
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63 | memcpy(buf, (char *)diskbuf->buffer + blkofs, copy); |
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64 | rc = rtems_bdbuf_release(diskbuf); |
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65 | args->bytes_moved += copy; |
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66 | if (rc != RTEMS_SUCCESSFUL) |
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67 | break; |
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68 | count -= copy; |
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69 | buf += copy; |
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70 | blkofs = 0; |
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71 | block++; |
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72 | } |
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73 | |
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74 | return rc; |
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75 | } |
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76 | |
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77 | /* rtems_blkdev_generic_write -- |
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78 | * Generic block device write primitive. Implemented using block device |
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79 | * buffer management primitives. |
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80 | */ |
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81 | rtems_device_driver |
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82 | rtems_blkdev_generic_write( |
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83 | rtems_device_major_number major __attribute__((unused)), |
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84 | rtems_device_minor_number minor __attribute__((unused)), |
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85 | void * arg) |
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86 | { |
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87 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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88 | rtems_libio_rw_args_t *args = arg; |
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89 | rtems_libio_t *iop = args->iop; |
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90 | rtems_disk_device *dd = iop->data1; |
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91 | uint32_t block_size = dd->block_size; |
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92 | char *buf = args->buffer; |
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93 | uint32_t count = args->count; |
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94 | rtems_blkdev_bnum block = (rtems_blkdev_bnum) (args->offset / block_size); |
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95 | uint32_t blkofs = (uint32_t) (args->offset % block_size); |
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96 | |
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97 | args->bytes_moved = 0; |
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98 | |
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99 | while (count > 0) |
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100 | { |
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101 | rtems_bdbuf_buffer *diskbuf; |
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102 | uint32_t copy; |
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103 | |
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104 | if ((blkofs == 0) && (count >= block_size)) |
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105 | rc = rtems_bdbuf_get(dd, block, &diskbuf); |
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106 | else |
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107 | rc = rtems_bdbuf_read(dd, block, &diskbuf); |
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108 | if (rc != RTEMS_SUCCESSFUL) |
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109 | break; |
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110 | |
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111 | copy = block_size - blkofs; |
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112 | if (copy > count) |
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113 | copy = count; |
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114 | memcpy((char *)diskbuf->buffer + blkofs, buf, copy); |
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115 | args->bytes_moved += copy; |
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116 | |
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117 | rc = rtems_bdbuf_release_modified(diskbuf); |
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118 | if (rc != RTEMS_SUCCESSFUL) |
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119 | break; |
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120 | |
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121 | count -= copy; |
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122 | buf += copy; |
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123 | blkofs = 0; |
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124 | block++; |
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125 | } |
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126 | |
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127 | return rc; |
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128 | } |
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129 | |
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130 | /* blkdev_generic_open -- |
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131 | * Generic block device open primitive. |
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132 | */ |
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133 | rtems_device_driver |
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134 | rtems_blkdev_generic_open( |
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135 | rtems_device_major_number major, |
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136 | rtems_device_minor_number minor, |
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137 | void * arg) |
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138 | { |
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139 | rtems_libio_open_close_args_t *oc = arg; |
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140 | rtems_libio_t *iop = oc->iop; |
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141 | dev_t dev = rtems_filesystem_make_dev_t(major, minor); |
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142 | rtems_disk_device *dd = rtems_disk_obtain(dev); |
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143 | |
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144 | iop->data1 = dd; |
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145 | |
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146 | if (dd != NULL) |
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147 | return RTEMS_SUCCESSFUL; |
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148 | else |
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149 | return RTEMS_UNSATISFIED; |
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150 | } |
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151 | |
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152 | |
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153 | /* blkdev_generic_close -- |
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154 | * Generic block device close primitive. |
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155 | */ |
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156 | rtems_device_driver |
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157 | rtems_blkdev_generic_close( |
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158 | rtems_device_major_number major __attribute__((unused)), |
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159 | rtems_device_minor_number minor __attribute__((unused)), |
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160 | void * arg) |
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161 | { |
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162 | rtems_libio_open_close_args_t *oc = arg; |
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163 | rtems_libio_t *iop = oc->iop; |
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164 | rtems_disk_device *dd = iop->data1; |
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165 | |
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166 | rtems_disk_release(dd); |
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167 | |
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168 | return RTEMS_SUCCESSFUL; |
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169 | } |
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170 | |
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171 | /* blkdev_generic_ioctl -- |
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172 | * Generic block device ioctl primitive. |
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173 | */ |
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174 | rtems_device_driver |
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175 | rtems_blkdev_generic_ioctl( |
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176 | rtems_device_major_number major __attribute__((unused)), |
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177 | rtems_device_minor_number minor __attribute__((unused)), |
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178 | void * arg) |
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179 | { |
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180 | rtems_libio_ioctl_args_t *args = arg; |
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181 | rtems_libio_t *iop = args->iop; |
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182 | rtems_disk_device *dd = iop->data1; |
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183 | |
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184 | if (args->command != RTEMS_BLKIO_REQUEST) |
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185 | { |
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186 | args->ioctl_return = (uint32_t) dd->ioctl(dd, |
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187 | args->command, |
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188 | args->buffer); |
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189 | } |
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190 | else |
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191 | { |
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192 | /* |
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193 | * It is not allowed to directly access the driver circumventing the |
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194 | * cache. |
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195 | */ |
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196 | args->ioctl_return = (uint32_t) -1; |
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197 | } |
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198 | |
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199 | return RTEMS_SUCCESSFUL; |
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200 | } |
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