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 | * RAM disk block device. |
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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 <rtems.h> |
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21 | #include <rtems/libio.h> |
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22 | #include <errno.h> |
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23 | #include <stdlib.h> |
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24 | #include <stdio.h> |
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25 | #include <string.h> |
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26 | #include <inttypes.h> |
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27 | |
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28 | #include <rtems/blkdev.h> |
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29 | #include <rtems/diskdevs.h> |
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30 | #include <rtems/ramdisk.h> |
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31 | |
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32 | /** |
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33 | * Control tracing. It can be compiled out of the code for small |
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34 | * footprint targets. Leave in by default. |
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35 | */ |
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36 | #if !defined (RTEMS_RAMDISK_TRACE) |
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37 | #define RTEMS_RAMDISK_TRACE 0 |
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38 | #endif |
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39 | |
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40 | #define RAMDISK_DEVICE_BASE_NAME "/dev/rd" |
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41 | |
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42 | /* Internal RAM disk descriptor */ |
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43 | struct ramdisk { |
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44 | uint32_t block_size; /* RAM disk block size, the media size */ |
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45 | rtems_blkdev_bnum block_num; /* Number of blocks on this RAM disk */ |
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46 | void *area; /* RAM disk memory area */ |
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47 | bool initialized; /* RAM disk is initialized */ |
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48 | bool malloced; /* != 0, if memory allocated by malloc for this RAM disk */ |
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49 | #if RTEMS_RAMDISK_TRACE |
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50 | int info_level; /* Trace level */ |
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51 | #endif |
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52 | }; |
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53 | |
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54 | static struct ramdisk *ramdisk; |
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55 | static uint32_t nramdisks; |
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56 | |
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57 | #if RTEMS_RAMDISK_TRACE |
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58 | /** |
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59 | * Print a message to the ramdisk output and flush it. |
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60 | * |
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61 | * @param rd The ramdisk control structure. |
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62 | * @param format The format string. See printf for details. |
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63 | * @param ... The arguments for the format text. |
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64 | * @return int The number of bytes written to the output. |
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65 | */ |
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66 | static int |
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67 | rtems_ramdisk_printf (struct ramdisk *rd, const char *format, ...) |
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68 | { |
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69 | int ret = 0; |
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70 | if (rd->info_level >= 1) |
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71 | { |
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72 | va_list args; |
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73 | va_start (args, format); |
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74 | fprintf (stdout, "ramdisk:"); |
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75 | ret = vfprintf (stdout, format, args); |
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76 | fprintf (stdout, "\n"); |
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77 | fflush (stdout); |
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78 | } |
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79 | return ret; |
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80 | } |
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81 | #endif |
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82 | |
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83 | /* ramdisk_read -- |
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84 | * RAM disk READ request handler. This primitive copies data from RAM |
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85 | * disk to supplied buffer and invoke the callout function to inform |
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86 | * upper layer that reading is completed. |
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87 | * |
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88 | * PARAMETERS: |
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89 | * req - pointer to the READ block device request info |
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90 | * |
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91 | * RETURNS: |
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92 | * ioctl return value |
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93 | */ |
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94 | static int |
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95 | ramdisk_read(struct ramdisk *rd, rtems_blkdev_request *req) |
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96 | { |
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97 | uint8_t *from = rd->area; |
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98 | uint32_t i; |
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99 | rtems_blkdev_sg_buffer *sg; |
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100 | |
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101 | #if RTEMS_RAMDISK_TRACE |
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102 | rtems_ramdisk_printf (rd, "ramdisk read: start=%d, blocks=%d", |
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103 | req->bufs[0].block, req->bufnum); |
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104 | #endif |
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105 | |
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106 | for (i = 0, sg = req->bufs; i < req->bufnum; i++, sg++) |
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107 | { |
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108 | #if RTEMS_RAMDISK_TRACE |
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109 | rtems_ramdisk_printf (rd, "ramdisk read: buf=%d block=%d length=%d off=%d addr=%p", |
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110 | i, sg->block, sg->length, sg->block * rd->block_size, |
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111 | from + (sg->block * rd->block_size)); |
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112 | #endif |
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113 | memcpy(sg->buffer, from + (sg->block * rd->block_size), sg->length); |
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114 | } |
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115 | req->req_done(req->done_arg, RTEMS_SUCCESSFUL, 0); |
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116 | return 0; |
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117 | } |
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118 | |
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119 | /* ramdisk_write -- |
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120 | * RAM disk WRITE request handler. This primitive copies data from |
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121 | * supplied buffer to RAM disk and invoke the callout function to inform |
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122 | * upper layer that writing is completed. |
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123 | * |
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124 | * PARAMETERS: |
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125 | * req - pointer to the WRITE block device request info |
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126 | * |
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127 | * RETURNS: |
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128 | * ioctl return value |
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129 | */ |
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130 | static int |
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131 | ramdisk_write(struct ramdisk *rd, rtems_blkdev_request *req) |
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132 | { |
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133 | uint8_t *to = rd->area; |
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134 | uint32_t i; |
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135 | rtems_blkdev_sg_buffer *sg; |
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136 | |
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137 | #if RTEMS_RAMDISK_TRACE |
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138 | rtems_ramdisk_printf (rd, "ramdisk write: start=%d, blocks=%d", |
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139 | req->bufs[0].block, req->bufnum); |
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140 | #endif |
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141 | for (i = 0, sg = req->bufs; i < req->bufnum; i++, sg++) |
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142 | { |
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143 | #if RTEMS_RAMDISK_TRACE |
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144 | rtems_ramdisk_printf (rd, "ramdisk write: buf=%d block=%d length=%d off=%d addr=%p", |
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145 | i, sg->block, sg->length, sg->block * rd->block_size, |
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146 | to + (sg->block * rd->block_size)); |
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147 | #endif |
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148 | memcpy(to + (sg->block * rd->block_size), sg->buffer, sg->length); |
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149 | } |
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150 | req->req_done(req->done_arg, RTEMS_SUCCESSFUL, 0); |
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151 | return 0; |
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152 | } |
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153 | |
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154 | /* ramdisk_ioctl -- |
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155 | * IOCTL handler for RAM disk device. |
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156 | * |
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157 | * PARAMETERS: |
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158 | * dev - device number (major, minor number) |
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159 | * req - IOCTL request code |
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160 | * argp - IOCTL argument |
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161 | * |
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162 | * RETURNS: |
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163 | * IOCTL return value |
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164 | */ |
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165 | static int |
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166 | ramdisk_ioctl(rtems_disk_device *dd, uint32_t req, void *argp) |
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167 | { |
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168 | switch (req) |
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169 | { |
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170 | case RTEMS_BLKIO_REQUEST: |
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171 | { |
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172 | rtems_blkdev_request *r = argp; |
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173 | struct ramdisk *rd = rtems_disk_driver_data(dd); |
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174 | |
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175 | switch (r->req) |
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176 | { |
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177 | case RTEMS_BLKDEV_REQ_READ: |
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178 | return ramdisk_read(rd, r); |
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179 | |
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180 | case RTEMS_BLKDEV_REQ_WRITE: |
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181 | return ramdisk_write(rd, r); |
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182 | |
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183 | default: |
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184 | errno = EINVAL; |
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185 | return -1; |
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186 | } |
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187 | break; |
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188 | } |
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189 | |
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190 | default: |
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191 | return rtems_blkdev_ioctl (dd, req, argp); |
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192 | break; |
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193 | } |
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194 | |
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195 | errno = EINVAL; |
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196 | return -1; |
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197 | } |
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198 | |
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199 | /* ramdisk_initialize -- |
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200 | * RAM disk device driver initialization. Run through RAM disk |
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201 | * configuration information and configure appropriate RAM disks. |
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202 | * |
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203 | * PARAMETERS: |
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204 | * major - RAM disk major device number |
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205 | * minor - minor device number, not applicable |
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206 | * arg - initialization argument, not applicable |
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207 | * |
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208 | * RETURNS: |
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209 | * none |
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210 | */ |
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211 | rtems_device_driver |
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212 | ramdisk_initialize( |
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213 | rtems_device_major_number major, |
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214 | rtems_device_minor_number minor __attribute__((unused)), |
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215 | void *arg __attribute__((unused))) |
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216 | { |
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217 | rtems_device_minor_number i; |
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218 | rtems_ramdisk_config *c = rtems_ramdisk_configuration; |
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219 | struct ramdisk *r; |
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220 | rtems_status_code rc; |
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221 | |
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222 | rc = rtems_disk_io_initialize(); |
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223 | if (rc != RTEMS_SUCCESSFUL) |
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224 | return rc; |
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225 | |
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226 | r = ramdisk = calloc(rtems_ramdisk_configuration_size, |
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227 | sizeof(struct ramdisk)); |
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228 | #if RTEMS_RAMDISK_TRACE |
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229 | r->info_level = 1; |
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230 | #endif |
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231 | for (i = 0; i < rtems_ramdisk_configuration_size; i++, c++, r++) |
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232 | { |
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233 | dev_t dev = rtems_filesystem_make_dev_t(major, i); |
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234 | char name [] = RAMDISK_DEVICE_BASE_NAME "a"; |
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235 | name [sizeof(RAMDISK_DEVICE_BASE_NAME)] += i; |
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236 | r->block_size = c->block_size; |
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237 | r->block_num = c->block_num; |
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238 | if (c->location == NULL) |
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239 | { |
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240 | r->malloced = true; |
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241 | r->area = malloc(r->block_size * r->block_num); |
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242 | if (r->area == NULL) /* No enough memory for this disk */ |
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243 | { |
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244 | r->initialized = false; |
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245 | continue; |
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246 | } |
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247 | else |
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248 | { |
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249 | r->initialized = true; |
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250 | } |
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251 | } |
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252 | else |
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253 | { |
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254 | r->malloced = false; |
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255 | r->initialized = true; |
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256 | r->area = c->location; |
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257 | } |
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258 | rc = rtems_disk_create_phys(dev, c->block_size, c->block_num, |
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259 | ramdisk_ioctl, r, name); |
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260 | if (rc != RTEMS_SUCCESSFUL) |
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261 | { |
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262 | if (r->malloced) |
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263 | { |
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264 | free(r->area); |
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265 | } |
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266 | r->initialized = false; |
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267 | } |
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268 | } |
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269 | nramdisks = rtems_ramdisk_configuration_size; |
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270 | return RTEMS_SUCCESSFUL; |
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271 | } |
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