1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_ramdisk |
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5 | * |
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6 | * @brief RAM disk block device implementation. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2009 |
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11 | * embedded brains GmbH |
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12 | * Obere Lagerstr. 30 |
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13 | * D-82178 Puchheim |
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14 | * Germany |
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15 | * <rtems@embedded-brains.de> |
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16 | * |
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17 | * The license and distribution terms for this file may be |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.com/license/LICENSE. |
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20 | * |
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21 | * $Id$ |
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22 | */ |
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23 | |
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24 | #include <stdlib.h> |
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25 | |
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26 | #include <rtems.h> |
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27 | #include <rtems/ramdisk.h> |
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28 | |
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29 | const rtems_driver_address_table ramdisk_ops = { |
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30 | .initialization_entry = NULL, |
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31 | RTEMS_GENERIC_BLOCK_DEVICE_DRIVER_ENTRIES |
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32 | }; |
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33 | |
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34 | ramdisk *ramdisk_allocate( |
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35 | void *area_begin, |
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36 | uint32_t block_size, |
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37 | rtems_blkdev_bnum block_count, |
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38 | bool trace |
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39 | ) |
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40 | { |
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41 | struct ramdisk *rd = malloc(sizeof(struct ramdisk)); |
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42 | |
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43 | if (rd == NULL) { |
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44 | return NULL; |
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45 | } |
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46 | |
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47 | if (area_begin == NULL) { |
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48 | area_begin = calloc(block_count, block_size); |
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49 | if (area_begin == NULL) { |
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50 | free(rd); |
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51 | |
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52 | return NULL; |
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53 | } |
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54 | rd->malloced = true; |
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55 | } else { |
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56 | rd->malloced = false; |
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57 | } |
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58 | rd->block_size = block_size; |
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59 | rd->block_num = block_count; |
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60 | rd->area = area_begin; |
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61 | rd->trace = trace; |
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62 | rd->initialized = true; |
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63 | |
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64 | return rd; |
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65 | } |
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66 | |
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67 | void ramdisk_free(ramdisk *rd) |
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68 | { |
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69 | if (rd != NULL) { |
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70 | if (rd->malloced) { |
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71 | free(rd->area); |
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72 | } |
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73 | free(rd); |
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74 | } |
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75 | } |
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76 | |
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77 | rtems_status_code ramdisk_register( |
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78 | uint32_t block_size, |
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79 | rtems_blkdev_bnum block_count, |
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80 | bool trace, |
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81 | const char *disk, |
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82 | dev_t *dev_ptr |
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83 | ) |
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84 | { |
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85 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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86 | rtems_device_major_number major = 0; |
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87 | ramdisk *rd = NULL; |
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88 | dev_t dev = 0; |
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89 | |
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90 | sc = rtems_io_register_driver(0, &ramdisk_ops, &major); |
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91 | if (sc != RTEMS_SUCCESSFUL) { |
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92 | return RTEMS_UNSATISFIED; |
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93 | } |
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94 | |
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95 | rd = ramdisk_allocate(NULL, block_size, block_count, trace); |
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96 | if (rd == NULL) { |
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97 | rtems_io_unregister_driver(major); |
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98 | |
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99 | return RTEMS_UNSATISFIED; |
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100 | } |
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101 | |
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102 | dev = rtems_filesystem_make_dev_t(major, 0); |
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103 | |
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104 | sc = rtems_disk_create_phys( |
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105 | dev, |
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106 | block_size, |
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107 | block_count, |
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108 | ramdisk_ioctl, |
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109 | rd, |
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110 | disk |
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111 | ); |
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112 | if (sc != RTEMS_SUCCESSFUL) { |
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113 | ramdisk_free(rd); |
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114 | rtems_io_unregister_driver(major); |
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115 | |
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116 | return RTEMS_UNSATISFIED; |
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117 | } |
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118 | |
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119 | *dev_ptr = dev; |
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120 | |
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121 | return RTEMS_SUCCESSFUL; |
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122 | } |
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