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) 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 | |
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14 | #ifdef HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | /* FIXME: How to set this define? */ |
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19 | #if !defined(RTEMS_RAMDISK_TRACE) |
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20 | #define RTEMS_RAMDISK_TRACE 0 |
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21 | #endif |
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22 | |
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23 | #include <stdlib.h> |
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24 | #include <errno.h> |
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25 | #include <string.h> |
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26 | |
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27 | #if RTEMS_RAMDISK_TRACE |
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28 | #include <stdio.h> |
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29 | #endif |
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30 | |
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31 | #include <rtems.h> |
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32 | #include <rtems/ramdisk.h> |
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33 | |
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34 | #if RTEMS_RAMDISK_TRACE |
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35 | static void |
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36 | rtems_ramdisk_printf (const ramdisk *rd, const char *format, ...) |
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37 | { |
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38 | if (rd->trace) |
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39 | { |
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40 | va_list args; |
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41 | va_start (args, format); |
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42 | printf ("ramdisk:"); |
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43 | vprintf (format, args); |
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44 | printf ("\n"); |
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45 | } |
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46 | } |
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47 | #endif |
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48 | |
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49 | static int |
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50 | ramdisk_read(struct ramdisk *rd, rtems_blkdev_request *req) |
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51 | { |
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52 | uint8_t *from = rd->area; |
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53 | uint32_t i; |
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54 | rtems_blkdev_sg_buffer *sg; |
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55 | |
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56 | #if RTEMS_RAMDISK_TRACE |
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57 | rtems_ramdisk_printf (rd, "ramdisk read: start=%d, blocks=%d", |
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58 | req->bufs[0].block, req->bufnum); |
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59 | #endif |
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60 | |
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61 | for (i = 0, sg = req->bufs; i < req->bufnum; i++, sg++) |
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62 | { |
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63 | #if RTEMS_RAMDISK_TRACE |
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64 | rtems_ramdisk_printf (rd, "ramdisk read: buf=%d block=%d length=%d off=%d addr=%p", |
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65 | i, sg->block, sg->length, sg->block * rd->block_size, |
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66 | from + (sg->block * rd->block_size)); |
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67 | #endif |
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68 | memcpy(sg->buffer, from + (sg->block * rd->block_size), sg->length); |
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69 | } |
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70 | rtems_blkdev_request_done (req, RTEMS_SUCCESSFUL); |
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71 | return 0; |
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72 | } |
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73 | |
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74 | static int |
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75 | ramdisk_write(struct ramdisk *rd, rtems_blkdev_request *req) |
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76 | { |
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77 | uint8_t *to = rd->area; |
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78 | uint32_t i; |
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79 | rtems_blkdev_sg_buffer *sg; |
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80 | |
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81 | #if RTEMS_RAMDISK_TRACE |
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82 | rtems_ramdisk_printf (rd, "ramdisk write: start=%d, blocks=%d", |
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83 | req->bufs[0].block, req->bufnum); |
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84 | #endif |
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85 | for (i = 0, sg = req->bufs; i < req->bufnum; i++, sg++) |
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86 | { |
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87 | #if RTEMS_RAMDISK_TRACE |
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88 | rtems_ramdisk_printf (rd, "ramdisk write: buf=%d block=%d length=%d off=%d addr=%p", |
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89 | i, sg->block, sg->length, sg->block * rd->block_size, |
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90 | to + (sg->block * rd->block_size)); |
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91 | #endif |
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92 | memcpy(to + (sg->block * rd->block_size), sg->buffer, sg->length); |
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93 | } |
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94 | rtems_blkdev_request_done (req, RTEMS_SUCCESSFUL); |
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95 | return 0; |
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96 | } |
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97 | |
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98 | int |
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99 | ramdisk_ioctl(rtems_disk_device *dd, uint32_t req, void *argp) |
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100 | { |
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101 | struct ramdisk *rd = rtems_disk_get_driver_data(dd); |
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102 | |
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103 | switch (req) |
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104 | { |
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105 | case RTEMS_BLKIO_REQUEST: |
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106 | { |
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107 | rtems_blkdev_request *r = argp; |
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108 | |
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109 | switch (r->req) |
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110 | { |
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111 | case RTEMS_BLKDEV_REQ_READ: |
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112 | return ramdisk_read(rd, r); |
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113 | |
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114 | case RTEMS_BLKDEV_REQ_WRITE: |
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115 | return ramdisk_write(rd, r); |
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116 | |
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117 | default: |
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118 | errno = EINVAL; |
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119 | return -1; |
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120 | } |
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121 | break; |
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122 | } |
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123 | |
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124 | case RTEMS_BLKIO_DELETED: |
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125 | if (rd->free_at_delete_request) { |
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126 | ramdisk_free(rd); |
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127 | } |
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128 | break; |
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129 | |
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130 | default: |
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131 | return rtems_blkdev_ioctl (dd, req, argp); |
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132 | break; |
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133 | } |
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134 | |
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135 | errno = EINVAL; |
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136 | return -1; |
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137 | } |
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