1 | /* |
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2 | * flashdisk.c -- Flash disk block device implementation |
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3 | * |
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4 | * Copyright (C) 2007 Chris Johns |
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5 | * |
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6 | * The license and distribution terms for this file may be |
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7 | * found in the file LICENSE in this distribution or at |
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8 | * http://www.rtems.com/license/LICENSE. |
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9 | * |
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10 | * $Id$ |
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11 | */ |
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12 | /** |
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13 | * @file |
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14 | * |
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15 | * Flash disk driver for RTEMS provides support for block based |
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16 | * file systems on flash devices. The driver is not a flash file |
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17 | * system nor does it try to compete with flash file systems. It |
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18 | * currently does not journal how-ever block sequence numbering |
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19 | * could be added to allow recovery of a past positions if |
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20 | * a power down occurred while being updated. |
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21 | * |
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22 | * This flash driver provides block device support for most flash |
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23 | * devices. The driver has been tested on NOR type devices such |
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24 | * as the AMLV160 or M28W160. Support for NAND type devices may |
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25 | * require driver changes to allow speedy recover of the block |
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26 | * mapping data and to also handle the current use of word programming. |
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27 | * Currently the page descriptors are stored in the first few pages |
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28 | * of each segment. |
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29 | * |
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30 | * The driver supports devices, segments and pages. You provide |
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31 | * to the driver the device descriptions as a table of device |
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32 | * descriptors. Each device descriptor contain a table of |
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33 | * segment descriptions or segment descriptors. The driver uses |
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34 | * this information to manage the devices. |
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35 | * |
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36 | * A device is made up of segments. These are also called |
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37 | * sectors or blocks. It is the smallest erasable part of a device. |
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38 | * A device can have differing size segments at different |
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39 | * offsets in the device. The segment descriptors support repeating |
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40 | * segments that are continous in the device. The driver breaks the |
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41 | * segments up into pages. The first pages of a segment contain |
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42 | * the page descriptors. A page descriptor hold the page flags, |
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43 | * a CRC for the page of data and the block number the page |
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44 | * holds. The block can appear in any order in the devices. A |
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45 | * page is active if it hold a current block of data. If the |
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46 | * used bit is set the page is counted as used. A page moves |
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47 | * from erased to active to used then back to erased. If a block |
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48 | * is written that is already in a page, the block is written to |
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49 | * a new page the old page is flagged as used. |
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50 | * |
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51 | * At initialisation time each segment's page descriptors are |
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52 | * read into memory and scanned to determine the active pages, |
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53 | * the used pages and the bad pages. If a segment has any erased |
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54 | * pages it is queue on the available queue. If the segment has |
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55 | * no erased pages it is queue on the used queue. |
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56 | * |
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57 | * The available queue is sorted from the least number available |
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58 | * to the most number of available pages. A segment that has just |
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59 | * been erased will placed at the end of the queue. A segment that |
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60 | * has only a few available pages will be used sooner and once |
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61 | * there are no available pages it is queued on the used queue. |
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62 | * The used queue hold segments that have no available pages and |
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63 | * is sorted from the least number of active pages to the most |
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64 | * number of active pages. |
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65 | * |
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66 | * The driver is required to compact segments. Compacting takes |
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67 | * the segment with the most number of available pages from the |
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68 | * available queue then takes segments with the least number of |
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69 | * active pages from the used queue until it has enough pages |
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70 | * to fill the empty segment. As the active pages are moved |
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71 | * they flagged as used and once the segment has only used pages |
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72 | * it is erased. |
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73 | * |
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74 | * A flash block driver like this never knows if a page is not |
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75 | * being used by the file-system. A typical file system is not |
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76 | * design with the idea of erasing a block on a disk once it is |
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77 | * not being used. The file-system will normally use a flag |
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78 | * or a location as a marker to say that part of the disk is |
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79 | * no longer in use. This means a number of blocks could be |
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80 | * held in active pages but are no in use by the file system. |
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81 | * The file system may also read blocks that have never been |
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82 | * written to disk. This complicates the driver and may make |
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83 | * the wear, usage and erase patterns harsher than a flash |
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84 | * file system. The driver may also suffer from problems if |
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85 | * power is lost. |
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86 | * |
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87 | * @note |
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88 | * |
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89 | * The use of pages can vary. The rtems_fdisk_seg_*_page set |
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90 | * routines use an absolute page number relative to the segment |
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91 | * while all other page numbera are relative to the number of |
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92 | * page descriptor pages a segment has. You need to add the |
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93 | * number of page descriptor pages (pages_desc) to the page number |
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94 | * when call the rtems_fdisk_seg_*_page functions. |
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95 | * |
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96 | * You must always show the page number as relative in any trace |
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97 | * or error message as device-segment-page and if you have to |
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98 | * the page number as absolute use device-segment~page. This |
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99 | * can be seen in the page copy routine. |
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100 | * |
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101 | * The code is like this to avoid needing the pass the pages_desc |
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102 | * value around. It is only used in selected places and so the |
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103 | * extra parameter was avoided. |
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104 | */ |
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105 | |
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106 | #if HAVE_CONFIG_H |
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107 | #include "config.h" |
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108 | #endif |
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109 | |
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110 | #include <rtems.h> |
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111 | #include <rtems/libio.h> |
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112 | #include <errno.h> |
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113 | #include <stdlib.h> |
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114 | #include <stdio.h> |
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115 | #include <string.h> |
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116 | #include <inttypes.h> |
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117 | |
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118 | #include "rtems/blkdev.h" |
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119 | #include "rtems/diskdevs.h" |
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120 | #include "rtems/flashdisk.h" |
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121 | |
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122 | /** |
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123 | * Control tracing. It can be compiled out of the code for small |
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124 | * footprint targets. Leave in by default. |
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125 | */ |
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126 | #if !defined (RTEMS_FDISK_TRACE) |
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127 | #define RTEMS_FDISK_TRACE 1 |
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128 | #endif |
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129 | |
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130 | /** |
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131 | * The start of a segment has a segment control table. This hold the CRC and |
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132 | * block number for the page. |
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133 | * |
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134 | * @todo A sequence number for the block could be added. This would |
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135 | * mean a larger descriptor size. Need to make the sequence |
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136 | * large like 20+ bits so a large file system would not have |
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137 | * more blocks available then the sequence number. |
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138 | */ |
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139 | typedef struct rtems_fdisk_page_desc |
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140 | { |
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141 | uint16_t crc; /**< The page's checksum. */ |
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142 | uint16_t flags; /**< The flags for the page. */ |
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143 | uint32_t block; /**< The block number. */ |
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144 | } rtems_fdisk_page_desc; |
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145 | |
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146 | /** |
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147 | * Flag the page as active. |
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148 | */ |
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149 | #define RTEMS_FDISK_PAGE_ACTIVE (1 << 0) |
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150 | |
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151 | /** |
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152 | * Flag the page as used. |
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153 | */ |
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154 | #define RTEMS_FDISK_PAGE_USED (1 << 1) |
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155 | |
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156 | /** |
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157 | * Flash Segment Control holds the pointer to the segment, number of |
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158 | * pages, various page stats and the memory copy of the page descriptors. |
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159 | */ |
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160 | typedef struct rtems_fdisk_segment_ctl |
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161 | { |
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162 | /** |
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163 | * Segments with available pages are maintained as a linked list. |
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164 | */ |
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165 | struct rtems_fdisk_segment_ctl* next; |
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166 | |
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167 | /** |
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168 | * The descriptor provided by the low-level driver. |
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169 | */ |
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170 | const rtems_fdisk_segment_desc* descriptor; |
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171 | |
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172 | /** |
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173 | * The device this segment resides on. |
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174 | */ |
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175 | uint32_t device; |
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176 | |
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177 | /** |
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178 | * The segment in the device. This must be within the |
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179 | * segment descriptor. |
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180 | */ |
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181 | uint32_t segment; |
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182 | |
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183 | /** |
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184 | * The in-memory ocpy of the page descriptors found at |
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185 | * the start of the segment in the flash device. |
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186 | */ |
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187 | rtems_fdisk_page_desc* page_descriptors; |
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188 | |
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189 | /* |
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190 | * Page stats. |
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191 | * |
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192 | * A bad page does not checksum or is not erased or has invalid flags. |
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193 | */ |
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194 | uint32_t pages; /**< Total number of pages in the segment. */ |
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195 | uint32_t pages_desc; /**< Number of pages used for page descriptors. */ |
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196 | uint32_t pages_active; /**< Number of pages flagged as active. */ |
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197 | uint32_t pages_used; /**< Number of pages flagged as used. */ |
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198 | uint32_t pages_bad; /**< Number of pages detected as bad. */ |
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199 | |
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200 | uint32_t failed; /**< The segment has failed. */ |
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201 | |
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202 | uint32_t erased; /**< Counter to debugging. Wear support would |
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203 | remove this. */ |
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204 | } rtems_fdisk_segment_ctl; |
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205 | |
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206 | /** |
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207 | * Segment control table queue. |
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208 | */ |
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209 | typedef struct rtems_fdisk_segment_ctl_queue |
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210 | { |
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211 | rtems_fdisk_segment_ctl* head; |
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212 | rtems_fdisk_segment_ctl* tail; |
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213 | uint32_t count; |
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214 | } rtems_fdisk_segment_ctl_queue; |
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215 | |
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216 | /** |
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217 | * Flash Device Control holds the segment controls |
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218 | */ |
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219 | typedef struct rtems_fdisk_device_ctl |
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220 | { |
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221 | rtems_fdisk_segment_ctl* segments; /**< Segment controls. */ |
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222 | uint32_t segment_count; /**< Segment control count. */ |
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223 | const rtems_fdisk_device_desc* descriptor; /**< Device descriptor. */ |
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224 | } rtems_fdisk_device_ctl; |
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225 | |
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226 | /** |
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227 | * The Block control holds the segment and page with the data. |
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228 | */ |
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229 | typedef struct rtems_fdisk_block_ctl |
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230 | { |
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231 | rtems_fdisk_segment_ctl* segment; /**< The segment with the block. */ |
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232 | uint32_t page; /**< The page in the segment. */ |
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233 | } rtems_fdisk_block_ctl; |
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234 | |
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235 | /** |
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236 | * The virtual block table holds the mapping for blocks as seen by the disk |
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237 | * drivers to the device, segment and page numbers of the physical device. |
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238 | */ |
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239 | typedef struct rtems_flashdisk |
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240 | { |
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241 | rtems_device_major_number major; /**< The driver's major number. */ |
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242 | rtems_device_minor_number minor; /**< The driver's minor number. */ |
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243 | |
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244 | uint32_t flags; /**< configuration flags. */ |
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245 | |
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246 | uint32_t compact_segs; /**< Max segs to compact at once. */ |
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247 | uint32_t avail_compact_segs; /**< The number of segments when |
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248 | compaction occurs when writing. */ |
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249 | |
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250 | uint32_t block_size; /**< The block size for this disk. */ |
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251 | rtems_fdisk_block_ctl* blocks; /**< The block to segment-page |
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252 | mappings. */ |
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253 | uint32_t block_count; /**< The number of avail. blocks. */ |
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254 | uint32_t unavail_blocks; /**< The number of unavail blocks. */ |
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255 | |
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256 | rtems_fdisk_device_ctl* devices; /**< The flash devices for this |
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257 | disk. */ |
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258 | uint32_t device_count; /**< The number of flash devices. */ |
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259 | |
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260 | rtems_fdisk_segment_ctl_queue available; /**< The queue of segments with |
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261 | available pages. */ |
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262 | rtems_fdisk_segment_ctl_queue used; /**< The list of segments with all |
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263 | pages used. */ |
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264 | rtems_fdisk_segment_ctl_queue erase; /**< The list of segments to be |
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265 | erased. */ |
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266 | rtems_fdisk_segment_ctl_queue failed; /**< The list of segments that failed |
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267 | when being erased. */ |
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268 | rtems_id lock; /**< Mutex for threading protection.*/ |
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269 | |
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270 | uint8_t* copy_buffer; /**< Copy buf used during compacting */ |
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271 | |
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272 | uint32_t info_level; /**< The info trace level. */ |
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273 | } rtems_flashdisk; |
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274 | |
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275 | /** |
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276 | * The array of flash disks we support. |
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277 | */ |
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278 | static rtems_flashdisk* rtems_flashdisks; |
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279 | |
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280 | /** |
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281 | * The number of flash disks we have. |
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282 | */ |
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283 | static uint32_t rtems_flashdisk_count; |
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284 | |
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285 | /** |
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286 | * The CRC16 factor table. Created during initialisation. |
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287 | */ |
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288 | static uint16_t* rtems_fdisk_crc16_factor; |
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289 | |
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290 | /** |
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291 | * Calculate the CRC16 checksum. |
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292 | * |
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293 | * @param _b The byte to checksum. |
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294 | * @param _c The current checksum. |
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295 | */ |
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296 | #define rtems_fdisk_calc_crc16(_b, _c) \ |
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297 | rtems_fdisk_crc16_factor[((_b) ^ ((_c) & 0xff)) & 0xff] ^ (((_c) >> 8) & 0xff) |
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298 | |
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299 | /** |
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300 | * Generate the CRC table. |
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301 | * |
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302 | * @param pattern The seed pattern for the table of factors. |
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303 | * @relval RTEMS_SUCCESSFUL The table was generated. |
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304 | * @retval RTEMS_NO_MEMORY The table could not be allocated from the heap. |
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305 | */ |
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306 | rtems_status_code |
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307 | rtems_fdisk_crc16_gen_factors (uint16_t pattern) |
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308 | { |
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309 | uint32_t b; |
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310 | |
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311 | rtems_fdisk_crc16_factor = malloc (sizeof (uint16_t) * 256); |
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312 | if (!rtems_fdisk_crc16_factor) |
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313 | return RTEMS_NO_MEMORY; |
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314 | |
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315 | for (b = 0; b < 256; b++) |
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316 | { |
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317 | uint32_t i; |
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318 | uint16_t v = b; |
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319 | for (i = 8; i--;) |
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320 | v = v & 1 ? (v >> 1) ^ pattern : v >> 1; |
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321 | rtems_fdisk_crc16_factor[b] = v & 0xffff; |
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322 | } |
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323 | return RTEMS_SUCCESSFUL; |
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324 | } |
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325 | |
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326 | #if RTEMS_FDISK_TRACE |
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327 | /** |
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328 | * Print a message to the flash disk output and flush it. |
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329 | * |
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330 | * @param fd The flashdisk control structure. |
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331 | * @param format The format string. See printf for details. |
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332 | * @param ... The arguments for the format text. |
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333 | * @return int The number of bytes written to the output. |
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334 | */ |
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335 | static int |
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336 | rtems_fdisk_printf (const rtems_flashdisk* fd, const char *format, ...) |
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337 | { |
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338 | int ret = 0; |
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339 | if (fd->info_level >= 3) |
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340 | { |
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341 | va_list args; |
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342 | va_start (args, format); |
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343 | fprintf (stdout, "fdisk:"); |
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344 | ret = vfprintf (stdout, format, args); |
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345 | fprintf (stdout, "\n"); |
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346 | fflush (stdout); |
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347 | } |
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348 | return ret; |
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349 | } |
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350 | |
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351 | /** |
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352 | * Print a info message to the flash disk output and flush it. |
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353 | * |
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354 | * @param fd The flashdisk control structure. |
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355 | * @param format The format string. See printf for details. |
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356 | * @param ... The arguments for the format text. |
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357 | * @return int The number of bytes written to the output. |
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358 | */ |
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359 | static int |
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360 | rtems_fdisk_info (const rtems_flashdisk* fd, const char *format, ...) |
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361 | { |
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362 | int ret = 0; |
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363 | if (fd->info_level >= 2) |
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364 | { |
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365 | va_list args; |
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366 | va_start (args, format); |
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367 | fprintf (stdout, "fdisk:"); |
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368 | ret = vfprintf (stdout, format, args); |
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369 | fprintf (stdout, "\n"); |
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370 | fflush (stdout); |
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371 | } |
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372 | return ret; |
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373 | } |
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374 | |
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375 | /** |
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376 | * Print a warning to the flash disk output and flush it. |
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377 | * |
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378 | * @param fd The flashdisk control structure. |
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379 | * @param format The format string. See printf for details. |
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380 | * @param ... The arguments for the format text. |
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381 | * @return int The number of bytes written to the output. |
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382 | */ |
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383 | static int |
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384 | rtems_fdisk_warning (const rtems_flashdisk* fd, const char *format, ...) |
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385 | { |
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386 | int ret = 0; |
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387 | if (fd->info_level >= 1) |
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388 | { |
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389 | va_list args; |
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390 | va_start (args, format); |
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391 | fprintf (stdout, "fdisk:warning:"); |
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392 | ret = vfprintf (stdout, format, args); |
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393 | fprintf (stdout, "\n"); |
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394 | fflush (stdout); |
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395 | } |
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396 | return ret; |
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397 | } |
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398 | #endif |
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399 | |
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400 | /** |
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401 | * Print an error to the flash disk output and flush it. |
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402 | * |
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403 | * @param format The format string. See printf for details. |
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404 | * @param ... The arguments for the format text. |
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405 | * @return int The number of bytes written to the output. |
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406 | */ |
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407 | static int |
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408 | rtems_fdisk_error (const char *format, ...) |
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409 | { |
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410 | int ret; |
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411 | va_list args; |
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412 | va_start (args, format); |
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413 | fprintf (stderr, "fdisk:error:"); |
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414 | ret = vfprintf (stderr, format, args); |
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415 | fprintf (stderr, "\n"); |
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416 | fflush (stderr); |
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417 | return ret; |
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418 | } |
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419 | |
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420 | /** |
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421 | * Print an abort message, flush it then abort the program. |
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422 | * |
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423 | * @param format The format string. See printf for details. |
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424 | * @param ... The arguments for the format text. |
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425 | */ |
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426 | static void |
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427 | rtems_fdisk_abort (const char *format, ...) |
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428 | { |
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429 | va_list args; |
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430 | va_start (args, format); |
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431 | fprintf (stderr, "fdisk:abort:"); |
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432 | vfprintf (stderr, format, args); |
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433 | fprintf (stderr, "\n"); |
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434 | fflush (stderr); |
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435 | exit (1); |
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436 | } |
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437 | |
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438 | /** |
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439 | * Initialise the segment control queue. |
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440 | */ |
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441 | static void |
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442 | rtems_fdisk_segment_queue_init (rtems_fdisk_segment_ctl_queue* queue) |
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443 | { |
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444 | queue->head = queue->tail = 0; |
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445 | queue->count = 0; |
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446 | } |
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447 | |
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448 | /** |
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449 | * Push to the head of the segment control queue. |
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450 | */ |
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451 | static void |
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452 | rtems_fdisk_segment_queue_push_head (rtems_fdisk_segment_ctl_queue* queue, |
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453 | rtems_fdisk_segment_ctl* sc) |
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454 | { |
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455 | if (sc) |
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456 | { |
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457 | sc->next = queue->head; |
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458 | queue->head = sc; |
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459 | |
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460 | if (queue->tail == 0) |
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461 | queue->tail = sc; |
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462 | queue->count++; |
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463 | } |
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464 | } |
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465 | |
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466 | /** |
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467 | * Pop the head of the segment control queue. |
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468 | */ |
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469 | static rtems_fdisk_segment_ctl* |
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470 | rtems_fdisk_segment_queue_pop_head (rtems_fdisk_segment_ctl_queue* queue) |
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471 | { |
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472 | if (queue->head) |
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473 | { |
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474 | rtems_fdisk_segment_ctl* sc = queue->head; |
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475 | |
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476 | queue->head = sc->next; |
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477 | if (!queue->head) |
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478 | queue->tail = 0; |
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479 | |
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480 | queue->count--; |
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481 | |
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482 | sc->next = 0; |
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483 | |
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484 | return sc; |
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485 | } |
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486 | |
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487 | return 0; |
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488 | } |
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489 | |
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490 | /** |
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491 | * Push to the tail of the segment control queue. |
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492 | */ |
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493 | static void |
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494 | rtems_fdisk_segment_queue_push_tail (rtems_fdisk_segment_ctl_queue* queue, |
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495 | rtems_fdisk_segment_ctl* sc) |
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496 | { |
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497 | if (sc) |
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498 | { |
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499 | sc->next = 0; |
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500 | |
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501 | if (queue->head) |
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502 | { |
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503 | queue->tail->next = sc; |
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504 | queue->tail = sc; |
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505 | } |
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506 | else |
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507 | { |
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508 | queue->head = queue->tail = sc; |
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509 | } |
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510 | |
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511 | queue->count++; |
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512 | } |
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513 | } |
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514 | |
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515 | /** |
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516 | * Remove from the segment control queue. |
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517 | */ |
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518 | static void |
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519 | rtems_fdisk_segment_queue_remove (rtems_fdisk_segment_ctl_queue* queue, |
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520 | rtems_fdisk_segment_ctl* sc) |
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521 | { |
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522 | rtems_fdisk_segment_ctl* prev = 0; |
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523 | rtems_fdisk_segment_ctl* it = queue->head; |
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524 | |
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525 | /* |
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526 | * Do not change sc->next as sc could be on another queue. |
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527 | */ |
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528 | |
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529 | while (it) |
---|
530 | { |
---|
531 | if (sc == it) |
---|
532 | { |
---|
533 | if (prev == 0) |
---|
534 | { |
---|
535 | queue->head = sc->next; |
---|
536 | if (queue->head == 0) |
---|
537 | queue->tail = 0; |
---|
538 | } |
---|
539 | else |
---|
540 | { |
---|
541 | prev->next = sc->next; |
---|
542 | if (queue->tail == sc) |
---|
543 | queue->tail = prev; |
---|
544 | } |
---|
545 | sc->next = 0; |
---|
546 | queue->count--; |
---|
547 | break; |
---|
548 | } |
---|
549 | |
---|
550 | prev = it; |
---|
551 | it = it->next; |
---|
552 | } |
---|
553 | } |
---|
554 | |
---|
555 | /** |
---|
556 | * Insert into the segment control queue before the specific |
---|
557 | * segment control item. |
---|
558 | */ |
---|
559 | static void |
---|
560 | rtems_fdisk_segment_queue_insert_before (rtems_fdisk_segment_ctl_queue* queue, |
---|
561 | rtems_fdisk_segment_ctl* item, |
---|
562 | rtems_fdisk_segment_ctl* sc) |
---|
563 | { |
---|
564 | if (item) |
---|
565 | { |
---|
566 | rtems_fdisk_segment_ctl** prev = &queue->head; |
---|
567 | rtems_fdisk_segment_ctl* it = queue->head; |
---|
568 | |
---|
569 | while (it) |
---|
570 | { |
---|
571 | if (item == it) |
---|
572 | { |
---|
573 | sc->next = item; |
---|
574 | *prev = sc; |
---|
575 | queue->count++; |
---|
576 | return; |
---|
577 | } |
---|
578 | |
---|
579 | prev = &it->next; |
---|
580 | it = it->next; |
---|
581 | } |
---|
582 | } |
---|
583 | |
---|
584 | rtems_fdisk_segment_queue_push_tail (queue, sc); |
---|
585 | } |
---|
586 | |
---|
587 | /** |
---|
588 | * Count the number of elements on the list. |
---|
589 | */ |
---|
590 | static uint32_t |
---|
591 | rtems_fdisk_segment_queue_count (rtems_fdisk_segment_ctl_queue* queue) |
---|
592 | { |
---|
593 | return queue->count; |
---|
594 | } |
---|
595 | |
---|
596 | /** |
---|
597 | * Count the number of elements on the list. |
---|
598 | */ |
---|
599 | static uint32_t |
---|
600 | rtems_fdisk_segment_count_queue (rtems_fdisk_segment_ctl_queue* queue) |
---|
601 | { |
---|
602 | rtems_fdisk_segment_ctl* sc = queue->head; |
---|
603 | uint32_t count = 0; |
---|
604 | |
---|
605 | while (sc) |
---|
606 | { |
---|
607 | count++; |
---|
608 | sc = sc->next; |
---|
609 | } |
---|
610 | |
---|
611 | return count; |
---|
612 | } |
---|
613 | |
---|
614 | /** |
---|
615 | * See if a segment control is present on this queue. |
---|
616 | */ |
---|
617 | static bool |
---|
618 | rtems_fdisk_segment_queue_present (rtems_fdisk_segment_ctl_queue* queue, |
---|
619 | rtems_fdisk_segment_ctl* sc) |
---|
620 | { |
---|
621 | rtems_fdisk_segment_ctl* it = queue->head; |
---|
622 | |
---|
623 | while (it) |
---|
624 | { |
---|
625 | if (it == sc) |
---|
626 | return true; |
---|
627 | it = it->next; |
---|
628 | } |
---|
629 | |
---|
630 | return false; |
---|
631 | } |
---|
632 | |
---|
633 | /** |
---|
634 | * Format a string with the queue status. |
---|
635 | */ |
---|
636 | static void |
---|
637 | rtems_fdisk_queue_status (rtems_flashdisk* fd, |
---|
638 | rtems_fdisk_segment_ctl* sc, |
---|
639 | char queues[5]) |
---|
640 | { |
---|
641 | queues[0] = rtems_fdisk_segment_queue_present (&fd->available, sc) ? 'A' : '-'; |
---|
642 | queues[1] = rtems_fdisk_segment_queue_present (&fd->used, sc) ? 'U' : '-'; |
---|
643 | queues[2] = rtems_fdisk_segment_queue_present (&fd->erase, sc) ? 'E' : '-'; |
---|
644 | queues[3] = rtems_fdisk_segment_queue_present (&fd->failed, sc) ? 'F' : '-'; |
---|
645 | queues[4] = '\0'; |
---|
646 | } |
---|
647 | |
---|
648 | /** |
---|
649 | * Check if the page descriptor is erased. |
---|
650 | */ |
---|
651 | static bool |
---|
652 | rtems_fdisk_page_desc_erased (const rtems_fdisk_page_desc* pd) |
---|
653 | { |
---|
654 | return ((pd->crc == 0xffff) && |
---|
655 | (pd->flags == 0xffff) && |
---|
656 | (pd->block == 0xffffffff)) ? true : false; |
---|
657 | } |
---|
658 | |
---|
659 | /** |
---|
660 | * Check if the flags are set. The flags are inverted as we can |
---|
661 | * only set a flag by changing it from 1 to 0. |
---|
662 | */ |
---|
663 | static bool |
---|
664 | rtems_fdisk_page_desc_flags_set (rtems_fdisk_page_desc* pd, uint16_t flags) |
---|
665 | { |
---|
666 | return (pd->flags & flags) == 0 ? true : false; |
---|
667 | } |
---|
668 | |
---|
669 | /** |
---|
670 | * Check if the flags are clear. The flags are inverted as we can |
---|
671 | * only set a flag by changing it from 1 to 0. |
---|
672 | */ |
---|
673 | static bool |
---|
674 | rtems_fdisk_page_desc_flags_clear (rtems_fdisk_page_desc* pd, uint16_t flags) |
---|
675 | { |
---|
676 | return (pd->flags & flags) == flags ? true : false; |
---|
677 | } |
---|
678 | |
---|
679 | /** |
---|
680 | * Set the flags. Setting means clear the bit to 0. |
---|
681 | */ |
---|
682 | static void |
---|
683 | rtems_fdisk_page_desc_set_flags (rtems_fdisk_page_desc* pd, uint16_t flags) |
---|
684 | { |
---|
685 | pd->flags &= ~flags; |
---|
686 | } |
---|
687 | |
---|
688 | /** |
---|
689 | * Get the segment descriptor for a device and segment. There are |
---|
690 | * no range checks. |
---|
691 | */ |
---|
692 | static const rtems_fdisk_segment_desc* |
---|
693 | rtems_fdisk_seg_descriptor (const rtems_flashdisk* fd, |
---|
694 | uint32_t device, |
---|
695 | uint32_t segment) |
---|
696 | { |
---|
697 | return fd->devices[device].segments[segment].descriptor; |
---|
698 | } |
---|
699 | |
---|
700 | /** |
---|
701 | * Count the segments for a device. |
---|
702 | */ |
---|
703 | static uint32_t |
---|
704 | rtems_fdisk_count_segments (const rtems_fdisk_device_desc* dd) |
---|
705 | { |
---|
706 | uint32_t count = 0; |
---|
707 | uint32_t segment; |
---|
708 | for (segment = 0; segment < dd->segment_count; segment++) |
---|
709 | count += dd->segments[segment].count; |
---|
710 | return count; |
---|
711 | } |
---|
712 | |
---|
713 | /** |
---|
714 | * Calculate the pages in a segment give the segment size and the |
---|
715 | * page size. |
---|
716 | * |
---|
717 | * @param sd The segment descriptor. |
---|
718 | * @param page_size The page size in bytes. |
---|
719 | */ |
---|
720 | static uint32_t |
---|
721 | rtems_fdisk_pages_in_segment (const rtems_fdisk_segment_desc* sd, |
---|
722 | uint32_t page_size) |
---|
723 | { |
---|
724 | return sd->size / page_size; |
---|
725 | } |
---|
726 | |
---|
727 | /** |
---|
728 | * Calculate the number of pages needed to hold the page descriptors. |
---|
729 | * The calculation need to round up. |
---|
730 | * |
---|
731 | * The segment control contains the number of pages used as descriptors |
---|
732 | * and should be used rather than this call where possible. |
---|
733 | */ |
---|
734 | static uint32_t |
---|
735 | rtems_fdisk_page_desc_pages (const rtems_fdisk_segment_desc* sd, |
---|
736 | uint32_t page_size) |
---|
737 | { |
---|
738 | uint32_t pages = rtems_fdisk_pages_in_segment (sd, page_size); |
---|
739 | uint32_t bytes = pages * sizeof (rtems_fdisk_page_desc); |
---|
740 | return ((bytes - 1) / page_size) + 1; |
---|
741 | } |
---|
742 | |
---|
743 | /** |
---|
744 | * The number of available pages is the total pages less the |
---|
745 | * active, used and bad pages. |
---|
746 | */ |
---|
747 | static uint32_t |
---|
748 | rtems_fdisk_seg_pages_available (const rtems_fdisk_segment_ctl* sc) |
---|
749 | { |
---|
750 | return sc->pages - (sc->pages_active + sc->pages_used + sc->pages_bad); |
---|
751 | } |
---|
752 | /** |
---|
753 | * Find the next available page in a segment. |
---|
754 | */ |
---|
755 | static uint32_t |
---|
756 | rtems_fdisk_seg_next_available_page (rtems_fdisk_segment_ctl* sc) |
---|
757 | { |
---|
758 | rtems_fdisk_page_desc* pd = &sc->page_descriptors[0]; |
---|
759 | uint32_t page; |
---|
760 | |
---|
761 | for (page = 0; page < sc->pages; page++, pd++) |
---|
762 | if (rtems_fdisk_page_desc_erased (pd)) |
---|
763 | break; |
---|
764 | |
---|
765 | return page; |
---|
766 | } |
---|
767 | |
---|
768 | /** |
---|
769 | * Find the segment on the queue that has the most free pages. |
---|
770 | */ |
---|
771 | static rtems_fdisk_segment_ctl* |
---|
772 | rtems_fdisk_seg_most_available (const rtems_fdisk_segment_ctl_queue* queue) |
---|
773 | { |
---|
774 | rtems_fdisk_segment_ctl* sc = queue->head; |
---|
775 | rtems_fdisk_segment_ctl* biggest = queue->head; |
---|
776 | |
---|
777 | while (sc) |
---|
778 | { |
---|
779 | if (rtems_fdisk_seg_pages_available (sc) > |
---|
780 | rtems_fdisk_seg_pages_available (biggest)) |
---|
781 | biggest = sc; |
---|
782 | sc = sc->next; |
---|
783 | } |
---|
784 | |
---|
785 | return biggest; |
---|
786 | } |
---|
787 | |
---|
788 | /** |
---|
789 | * Is the segment all used ? |
---|
790 | */ |
---|
791 | #if 0 |
---|
792 | static bool |
---|
793 | rtems_fdisk_seg_pages_all_used (const rtems_fdisk_segment_ctl* sc) |
---|
794 | { |
---|
795 | return sc->pages == (sc->pages_used + sc->pages_bad) ? true : false; |
---|
796 | } |
---|
797 | #endif |
---|
798 | |
---|
799 | /** |
---|
800 | * Calculate the blocks in a device. This is the number of |
---|
801 | * pages less the pages hold page descriptors. This call be used |
---|
802 | * early in the initialisation process and does not rely on |
---|
803 | * the system being fully initialised. |
---|
804 | * |
---|
805 | * @param dd The device descriptor. |
---|
806 | * @param page_size The page size in bytes. |
---|
807 | */ |
---|
808 | static uint32_t |
---|
809 | rtems_fdisk_blocks_in_device (const rtems_fdisk_device_desc* dd, |
---|
810 | uint32_t page_size) |
---|
811 | { |
---|
812 | uint32_t count = 0; |
---|
813 | uint32_t s; |
---|
814 | for (s = 0; s < dd->segment_count; s++) |
---|
815 | { |
---|
816 | const rtems_fdisk_segment_desc* sd = &dd->segments[s]; |
---|
817 | count += |
---|
818 | (rtems_fdisk_pages_in_segment (sd, page_size) - |
---|
819 | rtems_fdisk_page_desc_pages (sd, page_size)) * sd->count; |
---|
820 | } |
---|
821 | return count; |
---|
822 | } |
---|
823 | |
---|
824 | /** |
---|
825 | * Read a block of data from a segment. |
---|
826 | */ |
---|
827 | static int |
---|
828 | rtems_fdisk_seg_read (const rtems_flashdisk* fd, |
---|
829 | uint32_t device, |
---|
830 | uint32_t segment, |
---|
831 | uint32_t offset, |
---|
832 | void* buffer, |
---|
833 | uint32_t size) |
---|
834 | { |
---|
835 | const rtems_fdisk_segment_desc* sd; |
---|
836 | const rtems_fdisk_driver_handlers* ops; |
---|
837 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
838 | ops = fd->devices[device].descriptor->flash_ops; |
---|
839 | #if RTEMS_FDISK_TRACE |
---|
840 | rtems_fdisk_printf (fd, " seg-read: %02d-%03d: o=%08x s=%d", |
---|
841 | device, segment, offset, size); |
---|
842 | #endif |
---|
843 | return ops->read (sd, device, segment, offset, buffer, size); |
---|
844 | } |
---|
845 | |
---|
846 | /** |
---|
847 | * Write a block of data to a segment. It is assumed the |
---|
848 | * location in the segment is erased and able to take the |
---|
849 | * data. |
---|
850 | */ |
---|
851 | static int |
---|
852 | rtems_fdisk_seg_write (const rtems_flashdisk* fd, |
---|
853 | uint32_t device, |
---|
854 | uint32_t segment, |
---|
855 | uint32_t offset, |
---|
856 | const void* buffer, |
---|
857 | uint32_t size) |
---|
858 | { |
---|
859 | const rtems_fdisk_segment_desc* sd; |
---|
860 | const rtems_fdisk_driver_handlers* ops; |
---|
861 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
862 | ops = fd->devices[device].descriptor->flash_ops; |
---|
863 | #if RTEMS_FDISK_TRACE |
---|
864 | rtems_fdisk_printf (fd, " seg-write: %02d-%03d: o=%08x s=%d", |
---|
865 | device, segment, offset, size); |
---|
866 | #endif |
---|
867 | return ops->write (sd, device, segment, offset, buffer, size); |
---|
868 | } |
---|
869 | |
---|
870 | /** |
---|
871 | * Blank check the area of a segment. |
---|
872 | */ |
---|
873 | static int |
---|
874 | rtems_fdisk_seg_blank_check (const rtems_flashdisk* fd, |
---|
875 | uint32_t device, |
---|
876 | uint32_t segment, |
---|
877 | uint32_t offset, |
---|
878 | uint32_t size) |
---|
879 | { |
---|
880 | const rtems_fdisk_segment_desc* sd; |
---|
881 | const rtems_fdisk_driver_handlers* ops; |
---|
882 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
883 | ops = fd->devices[device].descriptor->flash_ops; |
---|
884 | #if RTEMS_FDISK_TRACE |
---|
885 | rtems_fdisk_printf (fd, " seg-blank: %02d-%03d: o=%08x s=%d", |
---|
886 | device, segment, offset, size); |
---|
887 | #endif |
---|
888 | return ops->blank (sd, device, segment, offset, size); |
---|
889 | } |
---|
890 | /** |
---|
891 | * Verify the data with the data in a segment. |
---|
892 | */ |
---|
893 | static int |
---|
894 | rtems_fdisk_seg_verify (const rtems_flashdisk* fd, |
---|
895 | uint32_t device, |
---|
896 | uint32_t segment, |
---|
897 | uint32_t offset, |
---|
898 | const void* buffer, |
---|
899 | uint32_t size) |
---|
900 | { |
---|
901 | const rtems_fdisk_segment_desc* sd; |
---|
902 | const rtems_fdisk_driver_handlers* ops; |
---|
903 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
904 | ops = fd->devices[device].descriptor->flash_ops; |
---|
905 | #if RTEMS_FDISK_TRACE |
---|
906 | rtems_fdisk_printf (fd, " seg-verify: %02d-%03d: o=%08x s=%d", |
---|
907 | device, segment, offset, size); |
---|
908 | #endif |
---|
909 | return ops->verify (sd, device, segment, offset, buffer, size); |
---|
910 | } |
---|
911 | |
---|
912 | /** |
---|
913 | * Blank check a page of data in a segment. |
---|
914 | */ |
---|
915 | static int |
---|
916 | rtems_fdisk_seg_blank_check_page (const rtems_flashdisk* fd, |
---|
917 | uint32_t device, |
---|
918 | uint32_t segment, |
---|
919 | uint32_t page) |
---|
920 | { |
---|
921 | return rtems_fdisk_seg_blank_check (fd, device, segment, |
---|
922 | page * fd->block_size, fd->block_size); |
---|
923 | } |
---|
924 | |
---|
925 | /** |
---|
926 | * Read a page of data from a segment. |
---|
927 | */ |
---|
928 | static int |
---|
929 | rtems_fdisk_seg_read_page (const rtems_flashdisk* fd, |
---|
930 | uint32_t device, |
---|
931 | uint32_t segment, |
---|
932 | uint32_t page, |
---|
933 | void* buffer) |
---|
934 | { |
---|
935 | return rtems_fdisk_seg_read (fd, device, segment, |
---|
936 | page * fd->block_size, buffer, fd->block_size); |
---|
937 | } |
---|
938 | |
---|
939 | /** |
---|
940 | * Write a page of data to a segment. |
---|
941 | */ |
---|
942 | static int |
---|
943 | rtems_fdisk_seg_write_page (const rtems_flashdisk* fd, |
---|
944 | uint32_t device, |
---|
945 | uint32_t segment, |
---|
946 | uint32_t page, |
---|
947 | const void* buffer) |
---|
948 | { |
---|
949 | if ((fd->flags & RTEMS_FDISK_BLANK_CHECK_BEFORE_WRITE)) |
---|
950 | { |
---|
951 | int ret = rtems_fdisk_seg_blank_check_page (fd, device, segment, page); |
---|
952 | if (ret) |
---|
953 | return ret; |
---|
954 | } |
---|
955 | return rtems_fdisk_seg_write (fd, device, segment, |
---|
956 | page * fd->block_size, buffer, fd->block_size); |
---|
957 | } |
---|
958 | |
---|
959 | /** |
---|
960 | * Verify a page of data with the data in the segment. |
---|
961 | */ |
---|
962 | static int |
---|
963 | rtems_fdisk_seg_verify_page (const rtems_flashdisk* fd, |
---|
964 | uint32_t device, |
---|
965 | uint32_t segment, |
---|
966 | uint32_t page, |
---|
967 | const void* buffer) |
---|
968 | { |
---|
969 | return rtems_fdisk_seg_verify (fd, device, segment, |
---|
970 | page * fd->block_size, buffer, fd->block_size); |
---|
971 | } |
---|
972 | |
---|
973 | /** |
---|
974 | * Copy a page of data from one segment to another segment. |
---|
975 | */ |
---|
976 | static int |
---|
977 | rtems_fdisk_seg_copy_page (const rtems_flashdisk* fd, |
---|
978 | uint32_t src_device, |
---|
979 | uint32_t src_segment, |
---|
980 | uint32_t src_page, |
---|
981 | uint32_t dst_device, |
---|
982 | uint32_t dst_segment, |
---|
983 | uint32_t dst_page) |
---|
984 | { |
---|
985 | int ret; |
---|
986 | #if RTEMS_FDISK_TRACE |
---|
987 | rtems_fdisk_printf (fd, " seg-copy-page: %02d-%03d~%03d=>%02d-%03d~%03d", |
---|
988 | src_device, src_segment, src_page, |
---|
989 | dst_device, dst_segment, dst_page); |
---|
990 | #endif |
---|
991 | ret = rtems_fdisk_seg_read_page (fd, src_device, src_segment, src_page, |
---|
992 | fd->copy_buffer); |
---|
993 | if (ret) |
---|
994 | return ret; |
---|
995 | return rtems_fdisk_seg_write_page (fd, dst_device, dst_segment, dst_page, |
---|
996 | fd->copy_buffer); |
---|
997 | } |
---|
998 | |
---|
999 | /** |
---|
1000 | * Write the page descriptor to a segment. This code assumes the page |
---|
1001 | * descriptors are located at offset 0 in the segment. |
---|
1002 | */ |
---|
1003 | static int |
---|
1004 | rtems_fdisk_seg_write_page_desc (const rtems_flashdisk* fd, |
---|
1005 | uint32_t device, |
---|
1006 | uint32_t segment, |
---|
1007 | uint32_t page, |
---|
1008 | const rtems_fdisk_page_desc* page_desc) |
---|
1009 | { |
---|
1010 | uint32_t offset = page * sizeof (rtems_fdisk_page_desc); |
---|
1011 | if ((fd->flags & RTEMS_FDISK_BLANK_CHECK_BEFORE_WRITE)) |
---|
1012 | { |
---|
1013 | int ret = rtems_fdisk_seg_blank_check (fd, device, segment, |
---|
1014 | offset, |
---|
1015 | sizeof (rtems_fdisk_page_desc)); |
---|
1016 | if (ret) |
---|
1017 | return ret; |
---|
1018 | } |
---|
1019 | return rtems_fdisk_seg_write (fd, device, segment, offset, |
---|
1020 | page_desc, sizeof (rtems_fdisk_page_desc)); |
---|
1021 | } |
---|
1022 | |
---|
1023 | /** |
---|
1024 | * Write the page descriptor flags to a segment. This code assumes the page |
---|
1025 | * descriptors are located at offset 0 in the segment. |
---|
1026 | */ |
---|
1027 | static int |
---|
1028 | rtems_fdisk_seg_write_page_desc_flags (const rtems_flashdisk* fd, |
---|
1029 | uint32_t device, |
---|
1030 | uint32_t segment, |
---|
1031 | uint32_t page, |
---|
1032 | const rtems_fdisk_page_desc* page_desc) |
---|
1033 | { |
---|
1034 | uint32_t offset = ((page * sizeof (rtems_fdisk_page_desc)) + |
---|
1035 | ((uint8_t*) &page_desc->flags) - ((uint8_t*) page_desc)); |
---|
1036 | if ((fd->flags & RTEMS_FDISK_BLANK_CHECK_BEFORE_WRITE)) |
---|
1037 | { |
---|
1038 | uint16_t flash_flags; |
---|
1039 | int ret; |
---|
1040 | ret = rtems_fdisk_seg_read (fd, device, segment, offset, |
---|
1041 | &flash_flags, sizeof (flash_flags)); |
---|
1042 | if (ret) |
---|
1043 | return ret; |
---|
1044 | if ((flash_flags & page_desc->flags) != page_desc->flags) |
---|
1045 | { |
---|
1046 | rtems_fdisk_error (" seg-write-page-flags: %02d-%03d-%03d: " \ |
---|
1047 | "flags not erased: 0x%04 -> 0x%04x", |
---|
1048 | device, segment, page, flash_flags, page_desc->flags); |
---|
1049 | return ret; |
---|
1050 | } |
---|
1051 | } |
---|
1052 | return rtems_fdisk_seg_write (fd, device, segment, offset, |
---|
1053 | &page_desc->flags, sizeof (page_desc->flags)); |
---|
1054 | } |
---|
1055 | |
---|
1056 | /** |
---|
1057 | * Erase a segment. |
---|
1058 | */ |
---|
1059 | static int |
---|
1060 | rtems_fdisk_seg_erase (const rtems_flashdisk* fd, |
---|
1061 | uint32_t device, |
---|
1062 | uint32_t segment) |
---|
1063 | { |
---|
1064 | const rtems_fdisk_segment_desc* sd; |
---|
1065 | const rtems_fdisk_driver_handlers* ops; |
---|
1066 | sd = rtems_fdisk_seg_descriptor (fd, device, segment); |
---|
1067 | ops = fd->devices[device].descriptor->flash_ops; |
---|
1068 | #if RTEMS_FDISK_TRACE |
---|
1069 | rtems_fdisk_printf (fd, " seg-erase: %02d-%03d", device, segment); |
---|
1070 | #endif |
---|
1071 | return ops->erase (sd, device, segment); |
---|
1072 | } |
---|
1073 | |
---|
1074 | /** |
---|
1075 | * Erase a device. |
---|
1076 | */ |
---|
1077 | static int |
---|
1078 | rtems_fdisk_device_erase (const rtems_flashdisk* fd, uint32_t device) |
---|
1079 | { |
---|
1080 | const rtems_fdisk_driver_handlers* ops; |
---|
1081 | ops = fd->devices[device].descriptor->flash_ops; |
---|
1082 | #if RTEMS_FDISK_TRACE |
---|
1083 | rtems_fdisk_printf (fd, " device-erase: %02d", device); |
---|
1084 | #endif |
---|
1085 | return ops->erase_device (fd->devices[device].descriptor, device); |
---|
1086 | } |
---|
1087 | |
---|
1088 | /** |
---|
1089 | * Erase all flash. |
---|
1090 | */ |
---|
1091 | static int |
---|
1092 | rtems_fdisk_erase_flash (const rtems_flashdisk* fd) |
---|
1093 | { |
---|
1094 | uint32_t device; |
---|
1095 | for (device = 0; device < fd->device_count; device++) |
---|
1096 | { |
---|
1097 | int ret; |
---|
1098 | |
---|
1099 | #if RTEMS_FDISK_TRACE |
---|
1100 | rtems_fdisk_info (fd, " erase-flash:%02d", device); |
---|
1101 | #endif |
---|
1102 | |
---|
1103 | ret = rtems_fdisk_device_erase (fd, device); |
---|
1104 | |
---|
1105 | if (ret != 0) |
---|
1106 | return ret; |
---|
1107 | } |
---|
1108 | return 0; |
---|
1109 | } |
---|
1110 | |
---|
1111 | /** |
---|
1112 | * Calculate the checksum of a page in a segment. |
---|
1113 | */ |
---|
1114 | static uint16_t |
---|
1115 | rtems_fdisk_page_checksum (const uint8_t* buffer, uint32_t page_size) |
---|
1116 | { |
---|
1117 | uint16_t cs = 0xffff; |
---|
1118 | uint32_t i; |
---|
1119 | |
---|
1120 | for (i = 0; i < page_size; i++, buffer++) |
---|
1121 | cs = rtems_fdisk_calc_crc16 (cs, *buffer); |
---|
1122 | |
---|
1123 | return cs; |
---|
1124 | } |
---|
1125 | |
---|
1126 | /** |
---|
1127 | * Erase the segment. |
---|
1128 | */ |
---|
1129 | static int |
---|
1130 | rtems_fdisk_erase_segment (rtems_flashdisk* fd, rtems_fdisk_segment_ctl* sc) |
---|
1131 | { |
---|
1132 | int ret = rtems_fdisk_seg_erase (fd, sc->device, sc->segment); |
---|
1133 | if (ret) |
---|
1134 | { |
---|
1135 | rtems_fdisk_error (" erase-segment:%02d-%03d: " \ |
---|
1136 | "segment erase failed: %s (%d)", |
---|
1137 | sc->device, sc->segment, strerror (ret), ret); |
---|
1138 | sc->failed = true; |
---|
1139 | if (!rtems_fdisk_segment_queue_present (&fd->failed, sc)) |
---|
1140 | rtems_fdisk_segment_queue_push_tail (&fd->failed, sc); |
---|
1141 | return ret; |
---|
1142 | } |
---|
1143 | |
---|
1144 | sc->erased++; |
---|
1145 | |
---|
1146 | memset (sc->page_descriptors, 0xff, sc->pages_desc * fd->block_size); |
---|
1147 | |
---|
1148 | sc->pages_active = 0; |
---|
1149 | sc->pages_used = 0; |
---|
1150 | sc->pages_bad = 0; |
---|
1151 | |
---|
1152 | sc->failed = false; |
---|
1153 | |
---|
1154 | /* |
---|
1155 | * Push to the tail of the available queue. It is a very |
---|
1156 | * simple type of wear reduction. Every other available |
---|
1157 | * segment will now get a go. |
---|
1158 | */ |
---|
1159 | rtems_fdisk_segment_queue_push_tail (&fd->available, sc); |
---|
1160 | |
---|
1161 | return 0; |
---|
1162 | } |
---|
1163 | |
---|
1164 | /** |
---|
1165 | * Erase used segment. |
---|
1166 | */ |
---|
1167 | static int |
---|
1168 | rtems_fdisk_erase_used (rtems_flashdisk* fd) |
---|
1169 | { |
---|
1170 | rtems_fdisk_segment_ctl* sc; |
---|
1171 | int latched_ret = 0; |
---|
1172 | |
---|
1173 | while ((sc = rtems_fdisk_segment_queue_pop_head (&fd->erase))) |
---|
1174 | { |
---|
1175 | /* |
---|
1176 | * The segment will either end up on the available queue or |
---|
1177 | * the failed queue. |
---|
1178 | */ |
---|
1179 | int ret = rtems_fdisk_erase_segment (fd, sc); |
---|
1180 | if (ret && !latched_ret) |
---|
1181 | latched_ret = ret; |
---|
1182 | } |
---|
1183 | |
---|
1184 | return latched_ret; |
---|
1185 | } |
---|
1186 | |
---|
1187 | /** |
---|
1188 | * Queue a segment. This is done after some of the stats for the segment |
---|
1189 | * have been changed and this may effect the order the segment pages have in |
---|
1190 | * the queue of available pages. |
---|
1191 | * |
---|
1192 | * @param fd The flash disk control table. |
---|
1193 | * @param sc The segment control table to be reallocated |
---|
1194 | */ |
---|
1195 | static void |
---|
1196 | rtems_fdisk_queue_segment (rtems_flashdisk* fd, rtems_fdisk_segment_ctl* sc) |
---|
1197 | { |
---|
1198 | #if RTEMS_FDISK_TRACE |
---|
1199 | rtems_fdisk_info (fd, " queue-seg:%02d-%03d: p=%d a=%d u=%d b=%d f=%s n=%s", |
---|
1200 | sc->device, sc->segment, |
---|
1201 | sc->pages, sc->pages_active, sc->pages_used, sc->pages_bad, |
---|
1202 | sc->failed ? "FAILED" : "no", sc->next ? "set" : "null"); |
---|
1203 | #endif |
---|
1204 | |
---|
1205 | /* |
---|
1206 | * If the segment has failed then check the failed queue and append |
---|
1207 | * if not failed. |
---|
1208 | */ |
---|
1209 | if (sc->failed) |
---|
1210 | { |
---|
1211 | if (!rtems_fdisk_segment_queue_present (&fd->failed, sc)) |
---|
1212 | rtems_fdisk_segment_queue_push_tail (&fd->failed, sc); |
---|
1213 | return; |
---|
1214 | } |
---|
1215 | |
---|
1216 | /* |
---|
1217 | * Remove the queue from the available or used queue. |
---|
1218 | */ |
---|
1219 | rtems_fdisk_segment_queue_remove (&fd->available, sc); |
---|
1220 | rtems_fdisk_segment_queue_remove (&fd->used, sc); |
---|
1221 | |
---|
1222 | /* |
---|
1223 | * Are all the pages in the segment used ? |
---|
1224 | * If they are and the driver has been configured to background |
---|
1225 | * erase place the segment on the used queue. If not configured |
---|
1226 | * to background erase perform the erase now. |
---|
1227 | * |
---|
1228 | */ |
---|
1229 | if (rtems_fdisk_seg_pages_available (sc) == 0) |
---|
1230 | { |
---|
1231 | if (sc->pages_active) |
---|
1232 | { |
---|
1233 | /* |
---|
1234 | * Keep the used queue sorted by the most number of used |
---|
1235 | * pages. When we compact we want to move the pages into |
---|
1236 | * a new segment and cover more than one segment. |
---|
1237 | */ |
---|
1238 | rtems_fdisk_segment_ctl* seg = fd->used.head; |
---|
1239 | |
---|
1240 | while (seg) |
---|
1241 | { |
---|
1242 | if (sc->pages_used > seg->pages_used) |
---|
1243 | break; |
---|
1244 | seg = seg->next; |
---|
1245 | } |
---|
1246 | |
---|
1247 | if (seg) |
---|
1248 | rtems_fdisk_segment_queue_insert_before (&fd->used, seg, sc); |
---|
1249 | else |
---|
1250 | rtems_fdisk_segment_queue_push_tail (&fd->used, sc); |
---|
1251 | } |
---|
1252 | else |
---|
1253 | { |
---|
1254 | if ((fd->flags & RTEMS_FDISK_BACKGROUND_ERASE)) |
---|
1255 | rtems_fdisk_segment_queue_push_tail (&fd->erase, sc); |
---|
1256 | else |
---|
1257 | rtems_fdisk_erase_segment (fd, sc); |
---|
1258 | } |
---|
1259 | } |
---|
1260 | else |
---|
1261 | { |
---|
1262 | /* |
---|
1263 | * The segment has pages available so place back onto the |
---|
1264 | * available list. The list is sorted from the least number |
---|
1265 | * of available pages to the most. This approach means |
---|
1266 | * the pages of a partially filled segment will be filled |
---|
1267 | * before moving onto another emptier segment. This keeps |
---|
1268 | * empty segments longer aiding compaction. |
---|
1269 | * |
---|
1270 | * The down side is the wear effect as a single segment |
---|
1271 | * could be used more than segment. This will not be |
---|
1272 | * addressed until wear support is added. |
---|
1273 | * |
---|
1274 | * @note Wear support can be added by having counts for |
---|
1275 | * for the number of times a segment is erased. This |
---|
1276 | * available list is then sorted on the least number |
---|
1277 | * of available pages then empty segments are sorted |
---|
1278 | * on the least number of erases the segment has. |
---|
1279 | * |
---|
1280 | * The erase count can be stored in specially flaged |
---|
1281 | * pages and contain a counter (32bits?) and 32 bits |
---|
1282 | * for each segment. When a segment is erased a |
---|
1283 | * bit is cleared for that segment. When 32 erasers |
---|
1284 | * has occurred the page is re-written to the flash |
---|
1285 | * with all the counters updated with the number of |
---|
1286 | * bits cleared and all bits set back to 1. |
---|
1287 | */ |
---|
1288 | rtems_fdisk_segment_ctl* seg = fd->available.head; |
---|
1289 | |
---|
1290 | while (seg) |
---|
1291 | { |
---|
1292 | if (rtems_fdisk_seg_pages_available (sc) < |
---|
1293 | rtems_fdisk_seg_pages_available (seg)) |
---|
1294 | break; |
---|
1295 | seg = seg->next; |
---|
1296 | } |
---|
1297 | |
---|
1298 | if (seg) |
---|
1299 | rtems_fdisk_segment_queue_insert_before (&fd->available, seg, sc); |
---|
1300 | else |
---|
1301 | rtems_fdisk_segment_queue_push_tail (&fd->available, sc); |
---|
1302 | } |
---|
1303 | } |
---|
1304 | |
---|
1305 | /** |
---|
1306 | * Compact the used segments to free what is available. Find the segment |
---|
1307 | * with the most avalable number of pages and see if the we have |
---|
1308 | * used segments that will fit. The used queue is sorted on the least |
---|
1309 | * number active pages. |
---|
1310 | */ |
---|
1311 | static int |
---|
1312 | rtems_fdisk_compact (rtems_flashdisk* fd) |
---|
1313 | { |
---|
1314 | uint32_t compacted_segs = 0; |
---|
1315 | |
---|
1316 | while (fd->used.head) |
---|
1317 | { |
---|
1318 | rtems_fdisk_segment_ctl* dsc; |
---|
1319 | rtems_fdisk_segment_ctl* ssc; |
---|
1320 | uint32_t dst_pages; |
---|
1321 | uint32_t segments; |
---|
1322 | uint32_t pages; |
---|
1323 | |
---|
1324 | #if RTEMS_FDISK_TRACE |
---|
1325 | rtems_fdisk_printf (fd, " compacting"); |
---|
1326 | #endif |
---|
1327 | |
---|
1328 | dsc = rtems_fdisk_seg_most_available (&fd->available); |
---|
1329 | |
---|
1330 | if (dsc == 0) |
---|
1331 | { |
---|
1332 | rtems_fdisk_error ("compacting: no available segments to compact too"); |
---|
1333 | return EIO; |
---|
1334 | } |
---|
1335 | |
---|
1336 | ssc = fd->used.head; |
---|
1337 | dst_pages = rtems_fdisk_seg_pages_available (dsc); |
---|
1338 | segments = 0; |
---|
1339 | pages = 0; |
---|
1340 | |
---|
1341 | #if RTEMS_FDISK_TRACE |
---|
1342 | rtems_fdisk_printf (fd, " dsc:%02d-%03d: most available", |
---|
1343 | dsc->device, dsc->segment); |
---|
1344 | #endif |
---|
1345 | |
---|
1346 | /* |
---|
1347 | * Count the number of segments that have active pages that fit into |
---|
1348 | * the destination segment. Also limit the number of segments that |
---|
1349 | * we handle during one compaction. A lower number means less aggressive |
---|
1350 | * compaction or less delay when compacting but it may mean the disk |
---|
1351 | * will fill. |
---|
1352 | */ |
---|
1353 | |
---|
1354 | while (ssc && |
---|
1355 | ((pages + ssc->pages_active) < dst_pages) && |
---|
1356 | ((compacted_segs + segments) < fd->compact_segs)) |
---|
1357 | { |
---|
1358 | pages += ssc->pages_active; |
---|
1359 | segments++; |
---|
1360 | ssc = ssc->next; |
---|
1361 | } |
---|
1362 | |
---|
1363 | /* |
---|
1364 | * We need a source segment and have pages to copy and |
---|
1365 | * compacting one segment to another is silly. Compaction needs |
---|
1366 | * to free at least one more segment. |
---|
1367 | */ |
---|
1368 | |
---|
1369 | if (!ssc || (pages == 0) || ((compacted_segs + segments) == 1)) |
---|
1370 | break; |
---|
1371 | |
---|
1372 | #if RTEMS_FDISK_TRACE |
---|
1373 | rtems_fdisk_printf (fd, " ssc scan: %d-%d: p=%ld, seg=%ld", |
---|
1374 | ssc->device, ssc->segment, |
---|
1375 | pages, segments); |
---|
1376 | #endif |
---|
1377 | |
---|
1378 | rtems_fdisk_segment_queue_remove (&fd->available, dsc); |
---|
1379 | |
---|
1380 | /* |
---|
1381 | * We now copy the pages to the new segment. |
---|
1382 | */ |
---|
1383 | |
---|
1384 | while (pages) |
---|
1385 | { |
---|
1386 | uint32_t spage; |
---|
1387 | int ret; |
---|
1388 | |
---|
1389 | ssc = rtems_fdisk_segment_queue_pop_head (&fd->used); |
---|
1390 | |
---|
1391 | if (ssc) |
---|
1392 | { |
---|
1393 | uint32_t used = 0; |
---|
1394 | uint32_t active = 0; |
---|
1395 | for (spage = 0; spage < ssc->pages; spage++) |
---|
1396 | { |
---|
1397 | rtems_fdisk_page_desc* spd = &ssc->page_descriptors[spage]; |
---|
1398 | |
---|
1399 | if (rtems_fdisk_page_desc_flags_set (spd, RTEMS_FDISK_PAGE_ACTIVE) && |
---|
1400 | !rtems_fdisk_page_desc_flags_set (spd, RTEMS_FDISK_PAGE_USED)) |
---|
1401 | { |
---|
1402 | rtems_fdisk_page_desc* dpd; |
---|
1403 | uint32_t dpage; |
---|
1404 | |
---|
1405 | dpage = rtems_fdisk_seg_next_available_page (dsc); |
---|
1406 | dpd = &dsc->page_descriptors[dpage]; |
---|
1407 | |
---|
1408 | active++; |
---|
1409 | |
---|
1410 | if (dpage >= dsc->pages) |
---|
1411 | { |
---|
1412 | rtems_fdisk_error ("compacting: %02d-%03d: " \ |
---|
1413 | "no page desc available: %d", |
---|
1414 | dsc->device, dsc->segment, |
---|
1415 | rtems_fdisk_seg_pages_available (dsc)); |
---|
1416 | dsc->failed = true; |
---|
1417 | rtems_fdisk_queue_segment (fd, dsc); |
---|
1418 | rtems_fdisk_segment_queue_push_head (&fd->used, ssc); |
---|
1419 | return EIO; |
---|
1420 | } |
---|
1421 | |
---|
1422 | #if RTEMS_FDISK_TRACE |
---|
1423 | rtems_fdisk_info (fd, "compacting: %02d-%03d-%03d=>%02d-%03d-%03d", |
---|
1424 | ssc->device, ssc->segment, spage, |
---|
1425 | dsc->device, dsc->segment, dpage); |
---|
1426 | #endif |
---|
1427 | ret = rtems_fdisk_seg_copy_page (fd, ssc->device, ssc->segment, |
---|
1428 | spage + ssc->pages_desc, |
---|
1429 | dsc->device, dsc->segment, |
---|
1430 | dpage + dsc->pages_desc); |
---|
1431 | if (ret) |
---|
1432 | { |
---|
1433 | rtems_fdisk_error ("compacting: %02d-%03d-%03d=>" \ |
---|
1434 | "%02d-%03d-%03d: " \ |
---|
1435 | "copy page failed: %s (%d)", |
---|
1436 | ssc->device, ssc->segment, spage, |
---|
1437 | dsc->device, dsc->segment, dpage, |
---|
1438 | strerror (ret), ret); |
---|
1439 | dsc->failed = true; |
---|
1440 | rtems_fdisk_queue_segment (fd, dsc); |
---|
1441 | rtems_fdisk_segment_queue_push_head (&fd->used, ssc); |
---|
1442 | return ret; |
---|
1443 | } |
---|
1444 | |
---|
1445 | *dpd = *spd; |
---|
1446 | |
---|
1447 | ret = rtems_fdisk_seg_write_page_desc (fd, |
---|
1448 | dsc->device, dsc->segment, |
---|
1449 | dpage, dpd); |
---|
1450 | |
---|
1451 | if (ret) |
---|
1452 | { |
---|
1453 | rtems_fdisk_error ("compacting: %02d-%03d-%03d=>" \ |
---|
1454 | "%02d-%03d-%03d: copy pd failed: %s (%d)", |
---|
1455 | ssc->device, ssc->segment, spage, |
---|
1456 | dsc->device, dsc->segment, dpage, |
---|
1457 | strerror (ret), ret); |
---|
1458 | dsc->failed = true; |
---|
1459 | rtems_fdisk_queue_segment (fd, dsc); |
---|
1460 | rtems_fdisk_segment_queue_push_head (&fd->used, ssc); |
---|
1461 | return ret; |
---|
1462 | } |
---|
1463 | |
---|
1464 | dsc->pages_active++; |
---|
1465 | |
---|
1466 | /* |
---|
1467 | * No need to set the used bit on the source page as the |
---|
1468 | * segment will be erased. Power down could be a problem. |
---|
1469 | * We do the stats to make sure everything is as it should |
---|
1470 | * be. |
---|
1471 | */ |
---|
1472 | |
---|
1473 | ssc->pages_active--; |
---|
1474 | ssc->pages_used++; |
---|
1475 | |
---|
1476 | fd->blocks[spd->block].segment = dsc; |
---|
1477 | fd->blocks[spd->block].page = dpage; |
---|
1478 | |
---|
1479 | /* |
---|
1480 | * Place the segment on to the correct queue. |
---|
1481 | */ |
---|
1482 | rtems_fdisk_queue_segment (fd, dsc); |
---|
1483 | |
---|
1484 | pages--; |
---|
1485 | } |
---|
1486 | else |
---|
1487 | used++; |
---|
1488 | } |
---|
1489 | |
---|
1490 | #if RTEMS_FDISK_TRACE |
---|
1491 | rtems_fdisk_printf (fd, "ssc end: %d-%d: p=%ld, a=%ld, u=%ld", |
---|
1492 | ssc->device, ssc->segment, |
---|
1493 | pages, active, used); |
---|
1494 | #endif |
---|
1495 | if (ssc->pages_active != 0) |
---|
1496 | { |
---|
1497 | rtems_fdisk_error ("compacting: ssc pages not 0: %d", |
---|
1498 | ssc->pages_active); |
---|
1499 | } |
---|
1500 | |
---|
1501 | ret = rtems_fdisk_erase_segment (fd, ssc); |
---|
1502 | |
---|
1503 | if (ret) |
---|
1504 | return ret; |
---|
1505 | } |
---|
1506 | } |
---|
1507 | |
---|
1508 | compacted_segs += segments; |
---|
1509 | } |
---|
1510 | |
---|
1511 | return 0; |
---|
1512 | } |
---|
1513 | |
---|
1514 | /** |
---|
1515 | * Recover the block mappings from the devices. |
---|
1516 | */ |
---|
1517 | static int |
---|
1518 | rtems_fdisk_recover_block_mappings (rtems_flashdisk* fd) |
---|
1519 | { |
---|
1520 | uint32_t device; |
---|
1521 | |
---|
1522 | /* |
---|
1523 | * Clear the queues. |
---|
1524 | */ |
---|
1525 | rtems_fdisk_segment_queue_init (&fd->available); |
---|
1526 | rtems_fdisk_segment_queue_init (&fd->used); |
---|
1527 | rtems_fdisk_segment_queue_init (&fd->erase); |
---|
1528 | rtems_fdisk_segment_queue_init (&fd->failed); |
---|
1529 | |
---|
1530 | /* |
---|
1531 | * Clear the lock mappings. |
---|
1532 | */ |
---|
1533 | memset (fd->blocks, 0, fd->block_count * sizeof (rtems_fdisk_block_ctl)); |
---|
1534 | |
---|
1535 | /* |
---|
1536 | * Scan each segment or each device recovering the valid pages. |
---|
1537 | */ |
---|
1538 | for (device = 0; device < fd->device_count; device++) |
---|
1539 | { |
---|
1540 | uint32_t segment; |
---|
1541 | for (segment = 0; segment < fd->devices[device].segment_count; segment++) |
---|
1542 | { |
---|
1543 | rtems_fdisk_segment_ctl* sc = &fd->devices[device].segments[segment]; |
---|
1544 | const rtems_fdisk_segment_desc* sd = sc->descriptor; |
---|
1545 | rtems_fdisk_page_desc* pd; |
---|
1546 | uint32_t page; |
---|
1547 | int ret; |
---|
1548 | |
---|
1549 | #if RTEMS_FDISK_TRACE |
---|
1550 | rtems_fdisk_info (fd, "recover-block-mappings:%02d-%03d", device, segment); |
---|
1551 | #endif |
---|
1552 | |
---|
1553 | sc->pages_desc = rtems_fdisk_page_desc_pages (sd, fd->block_size); |
---|
1554 | sc->pages = |
---|
1555 | rtems_fdisk_pages_in_segment (sd, fd->block_size) - sc->pages_desc; |
---|
1556 | |
---|
1557 | sc->pages_active = 0; |
---|
1558 | sc->pages_used = 0; |
---|
1559 | sc->pages_bad = 0; |
---|
1560 | |
---|
1561 | sc->failed = false; |
---|
1562 | |
---|
1563 | if (!sc->page_descriptors) |
---|
1564 | sc->page_descriptors = malloc (sc->pages_desc * fd->block_size); |
---|
1565 | |
---|
1566 | if (!sc->page_descriptors) |
---|
1567 | rtems_fdisk_abort ("no memory for page descriptors"); |
---|
1568 | |
---|
1569 | pd = sc->page_descriptors; |
---|
1570 | |
---|
1571 | /* |
---|
1572 | * The page descriptors are always at the start of the segment. Read |
---|
1573 | * the descriptors off the device into the segment control page |
---|
1574 | * descriptors. |
---|
1575 | * |
---|
1576 | * @todo It may be better to ask the driver to get these value |
---|
1577 | * so NAND flash could be better supported. |
---|
1578 | */ |
---|
1579 | ret = rtems_fdisk_seg_read (fd, device, segment, 0, (void*) pd, |
---|
1580 | sc->pages_desc * fd->block_size); |
---|
1581 | |
---|
1582 | if (ret) |
---|
1583 | { |
---|
1584 | rtems_fdisk_error ("recover-block-mappings:%02d-%03d: " \ |
---|
1585 | "read page desc failed: %s (%d)", |
---|
1586 | device, segment, strerror (ret), ret); |
---|
1587 | return ret; |
---|
1588 | } |
---|
1589 | |
---|
1590 | /* |
---|
1591 | * Check each page in the segement for valid pages. |
---|
1592 | * Update the stats for the segment so we know how many pages |
---|
1593 | * are active and how many are used. |
---|
1594 | * |
---|
1595 | * If the page is active see if the block is with-in range and |
---|
1596 | * if the block is a duplicate. |
---|
1597 | */ |
---|
1598 | for (page = 0; page < sc->pages; page++, pd++) |
---|
1599 | { |
---|
1600 | if (rtems_fdisk_page_desc_erased (pd)) |
---|
1601 | { |
---|
1602 | /* |
---|
1603 | * Is the page erased ? |
---|
1604 | */ |
---|
1605 | ret = rtems_fdisk_seg_blank_check_page (fd, device, segment, |
---|
1606 | page + sc->pages_desc); |
---|
1607 | |
---|
1608 | if (ret) |
---|
1609 | { |
---|
1610 | #if RTEMS_FDISK_TRACE |
---|
1611 | rtems_fdisk_warning (fd, "page not blank: %d-%d-%d", |
---|
1612 | device, segment, page, pd->block); |
---|
1613 | #endif |
---|
1614 | rtems_fdisk_page_desc_set_flags (pd, RTEMS_FDISK_PAGE_USED); |
---|
1615 | |
---|
1616 | ret = rtems_fdisk_seg_write_page_desc (fd, device, segment, |
---|
1617 | page, pd); |
---|
1618 | |
---|
1619 | if (ret) |
---|
1620 | { |
---|
1621 | rtems_fdisk_error ("forcing page to used failed: %d-%d-%d", |
---|
1622 | device, segment, page); |
---|
1623 | sc->failed = true; |
---|
1624 | } |
---|
1625 | |
---|
1626 | sc->pages_used++; |
---|
1627 | } |
---|
1628 | } |
---|
1629 | else |
---|
1630 | { |
---|
1631 | if (rtems_fdisk_page_desc_flags_set (pd, RTEMS_FDISK_PAGE_USED)) |
---|
1632 | { |
---|
1633 | sc->pages_used++; |
---|
1634 | } |
---|
1635 | else if (rtems_fdisk_page_desc_flags_set (pd, RTEMS_FDISK_PAGE_ACTIVE)) |
---|
1636 | { |
---|
1637 | if (pd->block >= fd->block_count) |
---|
1638 | { |
---|
1639 | #if RTEMS_FDISK_TRACE |
---|
1640 | rtems_fdisk_warning (fd, |
---|
1641 | "invalid block number: %d-%d-%d: block: %d", |
---|
1642 | device, segment, page, pd->block); |
---|
1643 | #endif |
---|
1644 | sc->pages_bad++; |
---|
1645 | } |
---|
1646 | else if (fd->blocks[pd->block].segment) |
---|
1647 | { |
---|
1648 | /** |
---|
1649 | * @todo |
---|
1650 | * This may need more work later. Maybe a counter is stored with |
---|
1651 | * each block so we can tell which is the later block when |
---|
1652 | * duplicates appear. A power down with a failed wirte could cause |
---|
1653 | * a duplicate. |
---|
1654 | */ |
---|
1655 | const rtems_fdisk_segment_ctl* bsc = fd->blocks[pd->block].segment; |
---|
1656 | rtems_fdisk_error ("duplicate block: %d-%d-%d: " \ |
---|
1657 | "duplicate: %d-%d-%d", |
---|
1658 | bsc->device, bsc->segment, |
---|
1659 | fd->blocks[pd->block].page, |
---|
1660 | device, segment, page); |
---|
1661 | sc->pages_bad++; |
---|
1662 | } |
---|
1663 | else |
---|
1664 | { |
---|
1665 | /** |
---|
1666 | * @todo |
---|
1667 | * Add start up crc checks here. |
---|
1668 | */ |
---|
1669 | fd->blocks[pd->block].segment = sc; |
---|
1670 | fd->blocks[pd->block].page = page; |
---|
1671 | |
---|
1672 | /* |
---|
1673 | * The page is active. |
---|
1674 | */ |
---|
1675 | sc->pages_active++; |
---|
1676 | } |
---|
1677 | } |
---|
1678 | else |
---|
1679 | sc->pages_bad++; |
---|
1680 | } |
---|
1681 | } |
---|
1682 | |
---|
1683 | /* |
---|
1684 | * Place the segment on to the correct queue. |
---|
1685 | */ |
---|
1686 | rtems_fdisk_queue_segment (fd, sc); |
---|
1687 | } |
---|
1688 | } |
---|
1689 | |
---|
1690 | return 0; |
---|
1691 | } |
---|
1692 | |
---|
1693 | /** |
---|
1694 | * Read a block. The block is checked to see if the page referenced |
---|
1695 | * is valid and the page has a valid crc. |
---|
1696 | * |
---|
1697 | * @param fd The rtems_flashdisk control table. |
---|
1698 | * @param block The block number to read. |
---|
1699 | * @param buffer The buffer to write the data into. |
---|
1700 | * @return 0 No error. |
---|
1701 | * @return EIO Invalid block size, block number, segment pointer, crc, |
---|
1702 | * page flags. |
---|
1703 | */ |
---|
1704 | static int |
---|
1705 | rtems_fdisk_read_block (rtems_flashdisk* fd, |
---|
1706 | uint32_t block, |
---|
1707 | uint8_t* buffer) |
---|
1708 | { |
---|
1709 | rtems_fdisk_block_ctl* bc; |
---|
1710 | rtems_fdisk_segment_ctl* sc; |
---|
1711 | rtems_fdisk_page_desc* pd; |
---|
1712 | |
---|
1713 | #if RTEMS_FDISK_TRACE |
---|
1714 | rtems_fdisk_info (fd, "read-block:%d", block); |
---|
1715 | #endif |
---|
1716 | |
---|
1717 | /* |
---|
1718 | * Broken out to allow info messages when testing. |
---|
1719 | */ |
---|
1720 | |
---|
1721 | if (block >= (fd->block_count - fd->unavail_blocks)) |
---|
1722 | { |
---|
1723 | rtems_fdisk_error ("read-block: block out of range: %d", block); |
---|
1724 | return EIO; |
---|
1725 | } |
---|
1726 | |
---|
1727 | bc = &fd->blocks[block]; |
---|
1728 | |
---|
1729 | if (!bc->segment) |
---|
1730 | { |
---|
1731 | #if RTEMS_FDISK_TRACE |
---|
1732 | rtems_fdisk_info (fd, "read-block: no segment mapping: %d", block); |
---|
1733 | #endif |
---|
1734 | memset (buffer, fd->block_size, 0xff); |
---|
1735 | return 0; |
---|
1736 | } |
---|
1737 | |
---|
1738 | sc = fd->blocks[block].segment; |
---|
1739 | pd = &sc->page_descriptors[bc->page]; |
---|
1740 | |
---|
1741 | #if RTEMS_FDISK_TRACE |
---|
1742 | rtems_fdisk_info (fd, |
---|
1743 | " read:%d=>%02d-%03d-%03d: p=%d a=%d u=%d b=%d n=%s: " \ |
---|
1744 | "f=%04x c=%04x b=%d", |
---|
1745 | block, sc->device, sc->segment, bc->page, |
---|
1746 | sc->pages, sc->pages_active, sc->pages_used, sc->pages_bad, |
---|
1747 | sc->next ? "set" : "null", |
---|
1748 | pd->flags, pd->crc, pd->block); |
---|
1749 | #endif |
---|
1750 | |
---|
1751 | if (rtems_fdisk_page_desc_flags_set (pd, RTEMS_FDISK_PAGE_ACTIVE)) |
---|
1752 | { |
---|
1753 | if (rtems_fdisk_page_desc_flags_clear (pd, RTEMS_FDISK_PAGE_USED)) |
---|
1754 | { |
---|
1755 | uint16_t cs; |
---|
1756 | |
---|
1757 | /* |
---|
1758 | * We use the segment page offset not the page number used in the |
---|
1759 | * driver. This skips the page descriptors. |
---|
1760 | */ |
---|
1761 | int ret = rtems_fdisk_seg_read_page (fd, sc->device, sc->segment, |
---|
1762 | bc->page + sc->pages_desc, buffer); |
---|
1763 | |
---|
1764 | if (ret) |
---|
1765 | { |
---|
1766 | #if RTEMS_FDISK_TRACE |
---|
1767 | rtems_fdisk_info (fd, |
---|
1768 | "read-block:%02d-%03d-%03d: read page failed: %s (%d)", |
---|
1769 | sc->device, sc->segment, bc->page, |
---|
1770 | strerror (ret), ret); |
---|
1771 | #endif |
---|
1772 | return ret; |
---|
1773 | } |
---|
1774 | |
---|
1775 | cs = rtems_fdisk_page_checksum (buffer, fd->block_size); |
---|
1776 | |
---|
1777 | if (cs == pd->crc) |
---|
1778 | return 0; |
---|
1779 | |
---|
1780 | rtems_fdisk_error ("read-block: crc failure: %d: buffer:%04x page:%04x", |
---|
1781 | block, cs, pd->crc); |
---|
1782 | } |
---|
1783 | else |
---|
1784 | { |
---|
1785 | rtems_fdisk_error ("read-block: block points to used page: %d: %d-%d-%d", |
---|
1786 | block, sc->device, sc->segment, bc->page); |
---|
1787 | } |
---|
1788 | } |
---|
1789 | else |
---|
1790 | { |
---|
1791 | rtems_fdisk_error ("read-block: block page not active: %d: %d-%d-%d", |
---|
1792 | block, sc->device, sc->segment, bc->page); |
---|
1793 | } |
---|
1794 | |
---|
1795 | return EIO; |
---|
1796 | } |
---|
1797 | |
---|
1798 | /** |
---|
1799 | * Write a block. The block: |
---|
1800 | * |
---|
1801 | * # May never have existed in flash before this write. |
---|
1802 | * # Exists and needs to be moved to a new page. |
---|
1803 | * |
---|
1804 | * If the block does not exist in flash we need to get the next |
---|
1805 | * segment available to place the page into. The segments with |
---|
1806 | * available pages are held on the avaliable list sorted on least |
---|
1807 | * number of available pages as the primary key. Currently there |
---|
1808 | * is no secondary key. Empty segments are at the end of the list. |
---|
1809 | * |
---|
1810 | * If the block already exists we need to set the USED bit in the |
---|
1811 | * current page's flags. This is a single byte which changes a 1 to |
---|
1812 | * a 0 and can be done with a single 16 bit write. The driver for |
---|
1813 | * 8 bit devices should only attempt the write on the changed bit. |
---|
1814 | * |
---|
1815 | * @param fd The rtems_flashdisk control table. |
---|
1816 | * @param block The block number to read. |
---|
1817 | * @param block_size The size of the block. Must match what we have. |
---|
1818 | * @param buffer The buffer to write the data into. |
---|
1819 | * @return 0 No error. |
---|
1820 | * @return EIO Invalid block size, block number, segment pointer, crc, |
---|
1821 | * page flags. |
---|
1822 | */ |
---|
1823 | static int |
---|
1824 | rtems_fdisk_write_block (rtems_flashdisk* fd, |
---|
1825 | uint32_t block, |
---|
1826 | const uint8_t* buffer) |
---|
1827 | { |
---|
1828 | rtems_fdisk_block_ctl* bc; |
---|
1829 | rtems_fdisk_segment_ctl* sc; |
---|
1830 | rtems_fdisk_page_desc* pd; |
---|
1831 | uint32_t page; |
---|
1832 | int ret; |
---|
1833 | |
---|
1834 | #if RTEMS_FDISK_TRACE |
---|
1835 | rtems_fdisk_info (fd, "write-block:%d", block); |
---|
1836 | #endif |
---|
1837 | |
---|
1838 | /* |
---|
1839 | * Broken out to allow info messages when testing. |
---|
1840 | */ |
---|
1841 | |
---|
1842 | if (block >= (fd->block_count - fd->unavail_blocks)) |
---|
1843 | { |
---|
1844 | rtems_fdisk_error ("write-block: block out of range: %d", block); |
---|
1845 | return EIO; |
---|
1846 | } |
---|
1847 | |
---|
1848 | bc = &fd->blocks[block]; |
---|
1849 | |
---|
1850 | /* |
---|
1851 | * Does the page exist in flash ? |
---|
1852 | */ |
---|
1853 | if (bc->segment) |
---|
1854 | { |
---|
1855 | sc = bc->segment; |
---|
1856 | pd = &sc->page_descriptors[bc->page]; |
---|
1857 | |
---|
1858 | #if RTEMS_FDISK_TRACE |
---|
1859 | rtems_fdisk_info (fd, " write:%02d-%03d-%03d: flag used", |
---|
1860 | sc->device, sc->segment, bc->page); |
---|
1861 | #endif |
---|
1862 | |
---|
1863 | /* |
---|
1864 | * The page exists in flash so see if the page has been changed. |
---|
1865 | */ |
---|
1866 | if (rtems_fdisk_seg_verify_page (fd, sc->device, sc->segment, |
---|
1867 | bc->page + sc->pages_desc, buffer) == 0) |
---|
1868 | { |
---|
1869 | #if RTEMS_FDISK_TRACE |
---|
1870 | rtems_fdisk_info (fd, "write-block:%d=>%02d-%03d-%03d: page verified", |
---|
1871 | block, sc->device, sc->segment, bc->page); |
---|
1872 | #endif |
---|
1873 | return 0; |
---|
1874 | } |
---|
1875 | |
---|
1876 | /* |
---|
1877 | * The page exists in flash so we need to set the used flag |
---|
1878 | * in the page descriptor. The descriptor is in memory with the |
---|
1879 | * segment control block. We can assume this memory copy |
---|
1880 | * matches the flash device. |
---|
1881 | */ |
---|
1882 | |
---|
1883 | rtems_fdisk_page_desc_set_flags (pd, RTEMS_FDISK_PAGE_USED); |
---|
1884 | |
---|
1885 | ret = rtems_fdisk_seg_write_page_desc_flags (fd, sc->device, sc->segment, |
---|
1886 | bc->page, pd); |
---|
1887 | |
---|
1888 | if (ret) |
---|
1889 | { |
---|
1890 | #if RTEMS_FDISK_TRACE |
---|
1891 | rtems_fdisk_info (fd, " write:%02d-%03d-%03d: " \ |
---|
1892 | "write used page desc failed: %s (%d)", |
---|
1893 | sc->device, sc->segment, bc->page, |
---|
1894 | strerror (ret), ret); |
---|
1895 | #endif |
---|
1896 | sc->failed = true; |
---|
1897 | } |
---|
1898 | else |
---|
1899 | { |
---|
1900 | sc->pages_active--; |
---|
1901 | sc->pages_used++; |
---|
1902 | } |
---|
1903 | |
---|
1904 | /* |
---|
1905 | * If possible reuse this segment. This will mean the segment |
---|
1906 | * needs to be removed from the available list and placed |
---|
1907 | * back if space is still available. |
---|
1908 | */ |
---|
1909 | rtems_fdisk_queue_segment (fd, sc); |
---|
1910 | |
---|
1911 | /* |
---|
1912 | * If no background compacting then compact in the forground. |
---|
1913 | * If we compact we ignore the error as there is little we |
---|
1914 | * can do from here. The write may will work. |
---|
1915 | */ |
---|
1916 | if ((fd->flags & RTEMS_FDISK_BACKGROUND_COMPACT) == 0) |
---|
1917 | rtems_fdisk_compact (fd); |
---|
1918 | } |
---|
1919 | |
---|
1920 | /* |
---|
1921 | * Is it time to compact the disk ? |
---|
1922 | * |
---|
1923 | * We override the background compaction configruation. |
---|
1924 | */ |
---|
1925 | if (rtems_fdisk_segment_count_queue (&fd->available) <= |
---|
1926 | fd->avail_compact_segs) |
---|
1927 | rtems_fdisk_compact (fd); |
---|
1928 | |
---|
1929 | /* |
---|
1930 | * Get the next avaliable segment. |
---|
1931 | */ |
---|
1932 | sc = rtems_fdisk_segment_queue_pop_head (&fd->available); |
---|
1933 | |
---|
1934 | /* |
---|
1935 | * Is the flash disk full ? |
---|
1936 | */ |
---|
1937 | if (!sc) |
---|
1938 | { |
---|
1939 | /* |
---|
1940 | * If compacting is configured for the background do it now |
---|
1941 | * to see if we can get some space back. |
---|
1942 | */ |
---|
1943 | if ((fd->flags & RTEMS_FDISK_BACKGROUND_COMPACT)) |
---|
1944 | rtems_fdisk_compact (fd); |
---|
1945 | |
---|
1946 | /* |
---|
1947 | * Try again for some free space. |
---|
1948 | */ |
---|
1949 | sc = rtems_fdisk_segment_queue_pop_head (&fd->available); |
---|
1950 | |
---|
1951 | if (!sc) |
---|
1952 | { |
---|
1953 | rtems_fdisk_error ("write-block: no available pages"); |
---|
1954 | return ENOSPC; |
---|
1955 | } |
---|
1956 | } |
---|
1957 | |
---|
1958 | #if RTEMS_FDISK_TRACE |
---|
1959 | if (fd->info_level >= 3) |
---|
1960 | { |
---|
1961 | char queues[5]; |
---|
1962 | rtems_fdisk_queue_status (fd, sc, queues); |
---|
1963 | rtems_fdisk_info (fd, " write:%d=>%02d-%03d: queue check: %s", |
---|
1964 | block, sc->device, sc->segment, queues); |
---|
1965 | } |
---|
1966 | #endif |
---|
1967 | |
---|
1968 | /* |
---|
1969 | * Find the next avaliable page in the segment. |
---|
1970 | */ |
---|
1971 | |
---|
1972 | pd = sc->page_descriptors; |
---|
1973 | |
---|
1974 | for (page = 0; page < sc->pages; page++, pd++) |
---|
1975 | { |
---|
1976 | if (rtems_fdisk_page_desc_erased (pd)) |
---|
1977 | { |
---|
1978 | pd->crc = rtems_fdisk_page_checksum (buffer, fd->block_size); |
---|
1979 | pd->block = block; |
---|
1980 | |
---|
1981 | bc->segment = sc; |
---|
1982 | bc->page = page; |
---|
1983 | |
---|
1984 | rtems_fdisk_page_desc_set_flags (pd, RTEMS_FDISK_PAGE_ACTIVE); |
---|
1985 | |
---|
1986 | #if RTEMS_FDISK_TRACE |
---|
1987 | rtems_fdisk_info (fd, " write:%d=>%02d-%03d-%03d: write: " \ |
---|
1988 | "p=%d a=%d u=%d b=%d n=%s: f=%04x c=%04x b=%d", |
---|
1989 | block, sc->device, sc->segment, page, |
---|
1990 | sc->pages, sc->pages_active, sc->pages_used, |
---|
1991 | sc->pages_bad, sc->next ? "set" : "null", |
---|
1992 | pd->flags, pd->crc, pd->block); |
---|
1993 | #endif |
---|
1994 | |
---|
1995 | /* |
---|
1996 | * We use the segment page offset not the page number used in the |
---|
1997 | * driver. This skips the page descriptors. |
---|
1998 | */ |
---|
1999 | ret = rtems_fdisk_seg_write_page (fd, sc->device, sc->segment, |
---|
2000 | page + sc->pages_desc, buffer); |
---|
2001 | if (ret) |
---|
2002 | { |
---|
2003 | #if RTEMS_FDISK_TRACE |
---|
2004 | rtems_fdisk_info (fd, "write-block:%02d-%03d-%03d: write page failed: " \ |
---|
2005 | "%s (%d)", sc->device, sc->segment, page, |
---|
2006 | strerror (ret), ret); |
---|
2007 | #endif |
---|
2008 | sc->failed = true; |
---|
2009 | } |
---|
2010 | else |
---|
2011 | { |
---|
2012 | ret = rtems_fdisk_seg_write_page_desc (fd, sc->device, sc->segment, |
---|
2013 | page, pd); |
---|
2014 | if (ret) |
---|
2015 | { |
---|
2016 | #if RTEMS_FDISK_TRACE |
---|
2017 | rtems_fdisk_info (fd, "write-block:%02d-%03d-%03d: " \ |
---|
2018 | "write page desc failed: %s (%d)", |
---|
2019 | sc->device, sc->segment, bc->page, |
---|
2020 | strerror (ret), ret); |
---|
2021 | #endif |
---|
2022 | sc->failed = true; |
---|
2023 | } |
---|
2024 | else |
---|
2025 | { |
---|
2026 | sc->pages_active++; |
---|
2027 | } |
---|
2028 | } |
---|
2029 | |
---|
2030 | rtems_fdisk_queue_segment (fd, sc); |
---|
2031 | return ret; |
---|
2032 | } |
---|
2033 | } |
---|
2034 | |
---|
2035 | rtems_fdisk_error ("write-block: no erased page descs in segment: %d-%d", |
---|
2036 | sc->device, sc->segment); |
---|
2037 | |
---|
2038 | sc->failed = true; |
---|
2039 | rtems_fdisk_queue_segment (fd, sc); |
---|
2040 | |
---|
2041 | return EIO; |
---|
2042 | } |
---|
2043 | |
---|
2044 | /** |
---|
2045 | * Disk READ request handler. This primitive copies data from the |
---|
2046 | * flash disk to the supplied buffer and invoke the callout function |
---|
2047 | * to inform upper layer that reading is completed. |
---|
2048 | * |
---|
2049 | * @param req Pointer to the READ block device request info. |
---|
2050 | * @retval int The ioctl return value. |
---|
2051 | */ |
---|
2052 | static int |
---|
2053 | rtems_fdisk_read (rtems_flashdisk* fd, rtems_blkdev_request* req) |
---|
2054 | { |
---|
2055 | rtems_blkdev_sg_buffer* sg = req->bufs; |
---|
2056 | uint32_t buf; |
---|
2057 | int ret = 0; |
---|
2058 | |
---|
2059 | for (buf = 0; (ret == 0) && (buf < req->bufnum); buf++, sg++) |
---|
2060 | { |
---|
2061 | uint8_t* data; |
---|
2062 | uint32_t fb; |
---|
2063 | uint32_t b; |
---|
2064 | fb = sg->length / fd->block_size; |
---|
2065 | data = sg->buffer; |
---|
2066 | for (b = 0; b < fb; b++, data += fd->block_size) |
---|
2067 | { |
---|
2068 | ret = rtems_fdisk_read_block (fd, sg->block + b, data); |
---|
2069 | if (ret) |
---|
2070 | break; |
---|
2071 | } |
---|
2072 | } |
---|
2073 | |
---|
2074 | req->req_done (req->done_arg, |
---|
2075 | ret ? RTEMS_SUCCESSFUL : RTEMS_IO_ERROR, ret); |
---|
2076 | |
---|
2077 | return ret; |
---|
2078 | } |
---|
2079 | |
---|
2080 | /** |
---|
2081 | * Flash disk WRITE request handler. This primitive copies data from |
---|
2082 | * supplied buffer to flash disk and invoke the callout function to inform |
---|
2083 | * upper layer that writing is completed. |
---|
2084 | * |
---|
2085 | * @param req Pointers to the WRITE block device request info. |
---|
2086 | * @retval int The ioctl return value. |
---|
2087 | */ |
---|
2088 | static int |
---|
2089 | rtems_fdisk_write (rtems_flashdisk* fd, rtems_blkdev_request* req) |
---|
2090 | { |
---|
2091 | rtems_blkdev_sg_buffer* sg = req->bufs; |
---|
2092 | uint32_t buf; |
---|
2093 | int ret = 0; |
---|
2094 | |
---|
2095 | for (buf = 0; (ret == 0) && (buf < req->bufnum); buf++, sg++) |
---|
2096 | { |
---|
2097 | uint8_t* data; |
---|
2098 | uint32_t fb; |
---|
2099 | uint32_t b; |
---|
2100 | fb = sg->length / fd->block_size; |
---|
2101 | data = sg->buffer; |
---|
2102 | for (b = 0; b < fb; b++, data += fd->block_size) |
---|
2103 | { |
---|
2104 | ret = rtems_fdisk_write_block (fd, sg->block + b, data); |
---|
2105 | if (ret) |
---|
2106 | break; |
---|
2107 | } |
---|
2108 | } |
---|
2109 | |
---|
2110 | req->req_done (req->done_arg, |
---|
2111 | ret ? RTEMS_SUCCESSFUL : RTEMS_IO_ERROR, ret); |
---|
2112 | |
---|
2113 | return 0; |
---|
2114 | } |
---|
2115 | |
---|
2116 | /** |
---|
2117 | * Flash disk erase disk. |
---|
2118 | * |
---|
2119 | * @param fd The flashdisk data. |
---|
2120 | * @retval int The ioctl return value. |
---|
2121 | */ |
---|
2122 | static int |
---|
2123 | rtems_fdisk_erase_disk (rtems_flashdisk* fd) |
---|
2124 | { |
---|
2125 | uint32_t device; |
---|
2126 | int ret; |
---|
2127 | |
---|
2128 | #if RTEMS_FDISK_TRACE |
---|
2129 | rtems_fdisk_info (fd, "erase-disk"); |
---|
2130 | #endif |
---|
2131 | |
---|
2132 | ret = rtems_fdisk_erase_flash (fd); |
---|
2133 | |
---|
2134 | if (ret == 0) |
---|
2135 | { |
---|
2136 | for (device = 0; device < fd->device_count; device++) |
---|
2137 | { |
---|
2138 | if (!fd->devices[device].segments) |
---|
2139 | return ENOMEM; |
---|
2140 | |
---|
2141 | ret = rtems_fdisk_recover_block_mappings (fd); |
---|
2142 | if (ret) |
---|
2143 | break; |
---|
2144 | } |
---|
2145 | } |
---|
2146 | |
---|
2147 | return ret; |
---|
2148 | } |
---|
2149 | |
---|
2150 | /** |
---|
2151 | * Flash Disk Monitoring data is return in the monitoring data |
---|
2152 | * structure. |
---|
2153 | */ |
---|
2154 | static int |
---|
2155 | rtems_fdisk_monitoring_data (rtems_flashdisk* fd, |
---|
2156 | rtems_fdisk_monitor_data* data) |
---|
2157 | { |
---|
2158 | uint32_t i; |
---|
2159 | uint32_t j; |
---|
2160 | |
---|
2161 | data->block_size = fd->block_size; |
---|
2162 | data->block_count = fd->block_count; |
---|
2163 | data->unavail_blocks = fd->unavail_blocks; |
---|
2164 | data->device_count = fd->device_count; |
---|
2165 | |
---|
2166 | data->blocks_used = 0; |
---|
2167 | for (i = 0; i < fd->block_count; i++) |
---|
2168 | if (fd->blocks[i].segment) |
---|
2169 | data->blocks_used++; |
---|
2170 | |
---|
2171 | data->segs_available = rtems_fdisk_segment_count_queue (&fd->available); |
---|
2172 | data->segs_used = rtems_fdisk_segment_count_queue (&fd->used); |
---|
2173 | data->segs_failed = rtems_fdisk_segment_count_queue (&fd->failed); |
---|
2174 | |
---|
2175 | data->segment_count = 0; |
---|
2176 | data->page_count = 0; |
---|
2177 | data->pages_desc = 0; |
---|
2178 | data->pages_active = 0; |
---|
2179 | data->pages_used = 0; |
---|
2180 | data->pages_bad = 0; |
---|
2181 | data->seg_erases = 0; |
---|
2182 | |
---|
2183 | for (i = 0; i < fd->device_count; i++) |
---|
2184 | { |
---|
2185 | data->segment_count += fd->devices[i].segment_count; |
---|
2186 | |
---|
2187 | for (j = 0; j < fd->devices[i].segment_count; j++) |
---|
2188 | { |
---|
2189 | rtems_fdisk_segment_ctl* sc = &fd->devices[i].segments[j]; |
---|
2190 | |
---|
2191 | data->page_count += sc->pages; |
---|
2192 | data->pages_desc += sc->pages_desc; |
---|
2193 | data->pages_active += sc->pages_active; |
---|
2194 | data->pages_used += sc->pages_used; |
---|
2195 | data->pages_bad += sc->pages_bad; |
---|
2196 | data->seg_erases += sc->erased; |
---|
2197 | } |
---|
2198 | } |
---|
2199 | |
---|
2200 | data->info_level = fd->info_level; |
---|
2201 | return 0; |
---|
2202 | } |
---|
2203 | |
---|
2204 | /** |
---|
2205 | * Print to stdout the status of the driver. This is a debugging aid. |
---|
2206 | */ |
---|
2207 | static int |
---|
2208 | rtems_fdisk_print_status (rtems_flashdisk* fd) |
---|
2209 | { |
---|
2210 | #if RTEMS_FDISK_TRACE |
---|
2211 | uint32_t current_info_level = fd->info_level; |
---|
2212 | uint32_t total; |
---|
2213 | uint32_t count; |
---|
2214 | uint32_t device; |
---|
2215 | |
---|
2216 | fd->info_level = 3; |
---|
2217 | |
---|
2218 | rtems_fdisk_printf (fd, |
---|
2219 | "Flash Disk Driver Status : %d.%d", fd->major, fd->minor); |
---|
2220 | |
---|
2221 | rtems_fdisk_printf (fd, "Block count\t%d", fd->block_count); |
---|
2222 | rtems_fdisk_printf (fd, "Unavail blocks\t%d", fd->unavail_blocks); |
---|
2223 | count = rtems_fdisk_segment_count_queue (&fd->available); |
---|
2224 | total = count; |
---|
2225 | rtems_fdisk_printf (fd, "Available queue\t%ld (%ld)", |
---|
2226 | count, rtems_fdisk_segment_queue_count (&fd->available)); |
---|
2227 | count = rtems_fdisk_segment_count_queue (&fd->used); |
---|
2228 | total += count; |
---|
2229 | rtems_fdisk_printf (fd, "Used queue\t%ld (%ld)", |
---|
2230 | count, rtems_fdisk_segment_queue_count (&fd->used)); |
---|
2231 | count = rtems_fdisk_segment_count_queue (&fd->erase); |
---|
2232 | total += count; |
---|
2233 | rtems_fdisk_printf (fd, "Erase queue\t%ld (%ld)", |
---|
2234 | count, rtems_fdisk_segment_queue_count (&fd->erase)); |
---|
2235 | count = rtems_fdisk_segment_count_queue (&fd->failed); |
---|
2236 | total += count; |
---|
2237 | rtems_fdisk_printf (fd, "Failed queue\t%ld (%ld)", |
---|
2238 | count, rtems_fdisk_segment_queue_count (&fd->failed)); |
---|
2239 | |
---|
2240 | count = 0; |
---|
2241 | for (device = 0; device < fd->device_count; device++) |
---|
2242 | count += fd->devices[device].segment_count; |
---|
2243 | |
---|
2244 | rtems_fdisk_printf (fd, "Queue total\t%ld of %ld, %s", total, count, |
---|
2245 | total == count ? "ok" : "MISSING"); |
---|
2246 | |
---|
2247 | rtems_fdisk_printf (fd, "Device count\t%d", fd->device_count); |
---|
2248 | |
---|
2249 | for (device = 0; device < fd->device_count; device++) |
---|
2250 | { |
---|
2251 | uint32_t block; |
---|
2252 | uint32_t seg; |
---|
2253 | |
---|
2254 | rtems_fdisk_printf (fd, " Device\t\t%ld", device); |
---|
2255 | rtems_fdisk_printf (fd, " Segment count\t%ld", |
---|
2256 | fd->devices[device].segment_count); |
---|
2257 | |
---|
2258 | for (seg = 0; seg < fd->devices[device].segment_count; seg++) |
---|
2259 | { |
---|
2260 | rtems_fdisk_segment_ctl* sc = &fd->devices[device].segments[seg]; |
---|
2261 | uint32_t page; |
---|
2262 | uint32_t erased = 0; |
---|
2263 | uint32_t active = 0; |
---|
2264 | uint32_t used = 0; |
---|
2265 | bool is_active = false; |
---|
2266 | char queues[5]; |
---|
2267 | |
---|
2268 | rtems_fdisk_queue_status (fd, sc, queues); |
---|
2269 | |
---|
2270 | for (page = 0; page < sc->pages; page++) |
---|
2271 | { |
---|
2272 | if (rtems_fdisk_page_desc_erased (&sc->page_descriptors[page])) |
---|
2273 | erased++; |
---|
2274 | else if (rtems_fdisk_page_desc_flags_set (&sc->page_descriptors[page], |
---|
2275 | RTEMS_FDISK_PAGE_ACTIVE)) |
---|
2276 | { |
---|
2277 | if (rtems_fdisk_page_desc_flags_set (&sc->page_descriptors[page], |
---|
2278 | RTEMS_FDISK_PAGE_USED)) |
---|
2279 | used++; |
---|
2280 | else |
---|
2281 | { |
---|
2282 | active++; |
---|
2283 | is_active = true; |
---|
2284 | } |
---|
2285 | } |
---|
2286 | |
---|
2287 | for (block = 0; block < fd->block_count; block++) |
---|
2288 | { |
---|
2289 | if ((fd->blocks[block].segment == sc) && |
---|
2290 | (fd->blocks[block].page == page) && !is_active) |
---|
2291 | rtems_fdisk_printf (fd, |
---|
2292 | " %ld\t not active when mapped by block %ld", |
---|
2293 | page, block); |
---|
2294 | } |
---|
2295 | } |
---|
2296 | |
---|
2297 | count = 0; |
---|
2298 | for (block = 0; block < fd->block_count; block++) |
---|
2299 | { |
---|
2300 | if (fd->blocks[block].segment == sc) |
---|
2301 | count++; |
---|
2302 | } |
---|
2303 | |
---|
2304 | rtems_fdisk_printf (fd, " %3ld %s p:%3ld a:%3ld/%3ld" \ |
---|
2305 | " u:%3ld/%3ld e:%3ld/%3ld br:%ld", |
---|
2306 | seg, queues, |
---|
2307 | sc->pages, sc->pages_active, active, |
---|
2308 | sc->pages_used, used, erased, |
---|
2309 | sc->pages - (sc->pages_active + |
---|
2310 | sc->pages_used + sc->pages_bad), |
---|
2311 | count); |
---|
2312 | } |
---|
2313 | } |
---|
2314 | |
---|
2315 | { |
---|
2316 | rtems_fdisk_segment_ctl* sc = fd->used.head; |
---|
2317 | int count = 0; |
---|
2318 | rtems_fdisk_printf (fd, "Used List:"); |
---|
2319 | while (sc) |
---|
2320 | { |
---|
2321 | rtems_fdisk_printf (fd, " %3d %02d:%03d u:%3ld", |
---|
2322 | count, sc->device, sc->segment, sc->pages_used); |
---|
2323 | sc = sc->next; |
---|
2324 | count++; |
---|
2325 | } |
---|
2326 | } |
---|
2327 | fd->info_level = current_info_level; |
---|
2328 | |
---|
2329 | return 0; |
---|
2330 | #else |
---|
2331 | return ENOSYS; |
---|
2332 | #endif |
---|
2333 | } |
---|
2334 | |
---|
2335 | /** |
---|
2336 | * Flash disk IOCTL handler. |
---|
2337 | * |
---|
2338 | * @param dd Disk device. |
---|
2339 | * @param req IOCTL request code. |
---|
2340 | * @param argp IOCTL argument. |
---|
2341 | * @retval The IOCTL return value |
---|
2342 | */ |
---|
2343 | static int |
---|
2344 | rtems_fdisk_ioctl (rtems_disk_device *dd, uint32_t req, void* argp) |
---|
2345 | { |
---|
2346 | dev_t dev = rtems_disk_physical_device_number (dd); |
---|
2347 | rtems_device_minor_number minor = rtems_filesystem_dev_minor_t (dev); |
---|
2348 | rtems_blkdev_request* r = argp; |
---|
2349 | rtems_status_code sc; |
---|
2350 | |
---|
2351 | errno = 0; |
---|
2352 | |
---|
2353 | sc = rtems_semaphore_obtain (rtems_flashdisks[minor].lock, RTEMS_WAIT, 0); |
---|
2354 | if (sc != RTEMS_SUCCESSFUL) |
---|
2355 | errno = EIO; |
---|
2356 | else |
---|
2357 | { |
---|
2358 | errno = 0; |
---|
2359 | switch (req) |
---|
2360 | { |
---|
2361 | case RTEMS_BLKIO_REQUEST: |
---|
2362 | if ((minor >= rtems_flashdisk_count) || |
---|
2363 | (rtems_flashdisks[minor].device_count == 0)) |
---|
2364 | { |
---|
2365 | errno = ENODEV; |
---|
2366 | } |
---|
2367 | else |
---|
2368 | { |
---|
2369 | switch (r->req) |
---|
2370 | { |
---|
2371 | case RTEMS_BLKDEV_REQ_READ: |
---|
2372 | errno = rtems_fdisk_read (&rtems_flashdisks[minor], r); |
---|
2373 | break; |
---|
2374 | |
---|
2375 | case RTEMS_BLKDEV_REQ_WRITE: |
---|
2376 | errno = rtems_fdisk_write (&rtems_flashdisks[minor], r); |
---|
2377 | break; |
---|
2378 | |
---|
2379 | default: |
---|
2380 | errno = EINVAL; |
---|
2381 | break; |
---|
2382 | } |
---|
2383 | } |
---|
2384 | break; |
---|
2385 | |
---|
2386 | case RTEMS_FDISK_IOCTL_ERASE_DISK: |
---|
2387 | errno = rtems_fdisk_erase_disk (&rtems_flashdisks[minor]); |
---|
2388 | break; |
---|
2389 | |
---|
2390 | case RTEMS_FDISK_IOCTL_COMPACT: |
---|
2391 | errno = rtems_fdisk_compact (&rtems_flashdisks[minor]); |
---|
2392 | break; |
---|
2393 | |
---|
2394 | case RTEMS_FDISK_IOCTL_ERASE_USED: |
---|
2395 | errno = rtems_fdisk_erase_used (&rtems_flashdisks[minor]); |
---|
2396 | break; |
---|
2397 | |
---|
2398 | case RTEMS_FDISK_IOCTL_MONITORING: |
---|
2399 | errno = rtems_fdisk_monitoring_data (&rtems_flashdisks[minor], |
---|
2400 | (rtems_fdisk_monitor_data*) argp); |
---|
2401 | break; |
---|
2402 | |
---|
2403 | case RTEMS_FDISK_IOCTL_INFO_LEVEL: |
---|
2404 | rtems_flashdisks[minor].info_level = (uint32_t) argp; |
---|
2405 | break; |
---|
2406 | |
---|
2407 | case RTEMS_FDISK_IOCTL_PRINT_STATUS: |
---|
2408 | errno = rtems_fdisk_print_status (&rtems_flashdisks[minor]); |
---|
2409 | break; |
---|
2410 | |
---|
2411 | default: |
---|
2412 | rtems_blkdev_ioctl (dd, req, argp); |
---|
2413 | break; |
---|
2414 | } |
---|
2415 | |
---|
2416 | sc = rtems_semaphore_release (rtems_flashdisks[minor].lock); |
---|
2417 | if (sc != RTEMS_SUCCESSFUL) |
---|
2418 | errno = EIO; |
---|
2419 | } |
---|
2420 | |
---|
2421 | return errno == 0 ? 0 : -1; |
---|
2422 | } |
---|
2423 | |
---|
2424 | /** |
---|
2425 | * Flash disk device driver initialization. |
---|
2426 | * |
---|
2427 | * @todo Memory clean up on error is really badly handled. |
---|
2428 | * |
---|
2429 | * @param major Flash disk major device number. |
---|
2430 | * @param minor Minor device number, not applicable. |
---|
2431 | * @param arg Initialization argument, not applicable. |
---|
2432 | */ |
---|
2433 | rtems_device_driver |
---|
2434 | rtems_fdisk_initialize (rtems_device_major_number major, |
---|
2435 | rtems_device_minor_number minor, |
---|
2436 | void* arg __attribute__((unused))) |
---|
2437 | { |
---|
2438 | const rtems_flashdisk_config* c = rtems_flashdisk_configuration; |
---|
2439 | rtems_flashdisk* fd; |
---|
2440 | rtems_status_code sc; |
---|
2441 | |
---|
2442 | sc = rtems_disk_io_initialize (); |
---|
2443 | if (sc != RTEMS_SUCCESSFUL) |
---|
2444 | return sc; |
---|
2445 | |
---|
2446 | sc = rtems_fdisk_crc16_gen_factors (0x8408); |
---|
2447 | if (sc != RTEMS_SUCCESSFUL) |
---|
2448 | return sc; |
---|
2449 | |
---|
2450 | rtems_flashdisks = calloc (rtems_flashdisk_configuration_size, |
---|
2451 | sizeof (rtems_flashdisk)); |
---|
2452 | |
---|
2453 | if (!rtems_flashdisks) |
---|
2454 | return RTEMS_NO_MEMORY; |
---|
2455 | |
---|
2456 | for (minor = 0; minor < rtems_flashdisk_configuration_size; minor++, c++) |
---|
2457 | { |
---|
2458 | char name[] = RTEMS_FLASHDISK_DEVICE_BASE_NAME "a"; |
---|
2459 | dev_t dev = rtems_filesystem_make_dev_t (major, minor); |
---|
2460 | uint32_t device; |
---|
2461 | uint32_t blocks = 0; |
---|
2462 | int ret; |
---|
2463 | |
---|
2464 | fd = &rtems_flashdisks[minor]; |
---|
2465 | |
---|
2466 | name [sizeof(RTEMS_FLASHDISK_DEVICE_BASE_NAME)] += minor; |
---|
2467 | |
---|
2468 | fd->major = major; |
---|
2469 | fd->minor = minor; |
---|
2470 | fd->flags = c->flags; |
---|
2471 | fd->compact_segs = c->compact_segs; |
---|
2472 | fd->avail_compact_segs = c->avail_compact_segs; |
---|
2473 | fd->block_size = c->block_size; |
---|
2474 | fd->unavail_blocks = c->unavail_blocks; |
---|
2475 | fd->info_level = c->info_level; |
---|
2476 | |
---|
2477 | for (device = 0; device < c->device_count; device++) |
---|
2478 | blocks += rtems_fdisk_blocks_in_device (&c->devices[device], |
---|
2479 | c->block_size); |
---|
2480 | |
---|
2481 | sc = rtems_disk_create_phys(dev, c->block_size, |
---|
2482 | blocks - fd->unavail_blocks, |
---|
2483 | rtems_fdisk_ioctl, NULL, name); |
---|
2484 | if (sc != RTEMS_SUCCESSFUL) |
---|
2485 | { |
---|
2486 | rtems_fdisk_error ("disk create phy failed"); |
---|
2487 | return sc; |
---|
2488 | } |
---|
2489 | |
---|
2490 | sc = rtems_semaphore_create (rtems_build_name ('F', 'D', 'S', 'K'), 1, |
---|
2491 | RTEMS_PRIORITY | RTEMS_BINARY_SEMAPHORE | |
---|
2492 | RTEMS_INHERIT_PRIORITY, 0, &fd->lock); |
---|
2493 | if (sc != RTEMS_SUCCESSFUL) |
---|
2494 | { |
---|
2495 | rtems_fdisk_error ("disk lock create failed"); |
---|
2496 | return sc; |
---|
2497 | } |
---|
2498 | |
---|
2499 | /* |
---|
2500 | * One copy buffer of a page size. |
---|
2501 | */ |
---|
2502 | fd->copy_buffer = malloc (c->block_size); |
---|
2503 | if (!fd->copy_buffer) |
---|
2504 | return RTEMS_NO_MEMORY; |
---|
2505 | |
---|
2506 | fd->blocks = calloc (blocks, sizeof (rtems_fdisk_block_ctl)); |
---|
2507 | if (!fd->blocks) |
---|
2508 | return RTEMS_NO_MEMORY; |
---|
2509 | |
---|
2510 | fd->block_count = blocks; |
---|
2511 | |
---|
2512 | fd->devices = calloc (c->device_count, sizeof (rtems_fdisk_device_ctl)); |
---|
2513 | if (!fd->devices) |
---|
2514 | return RTEMS_NO_MEMORY; |
---|
2515 | |
---|
2516 | for (device = 0; device < c->device_count; device++) |
---|
2517 | { |
---|
2518 | rtems_fdisk_segment_ctl* sc; |
---|
2519 | uint32_t segment_count; |
---|
2520 | uint32_t segment; |
---|
2521 | |
---|
2522 | segment_count = rtems_fdisk_count_segments (&c->devices[device]); |
---|
2523 | |
---|
2524 | fd->devices[device].segments = calloc (segment_count, |
---|
2525 | sizeof (rtems_fdisk_segment_ctl)); |
---|
2526 | if (!fd->devices[device].segments) |
---|
2527 | return RTEMS_NO_MEMORY; |
---|
2528 | |
---|
2529 | sc = fd->devices[device].segments; |
---|
2530 | |
---|
2531 | for (segment = 0; segment < c->devices[device].segment_count; segment++) |
---|
2532 | { |
---|
2533 | const rtems_fdisk_segment_desc* sd; |
---|
2534 | uint32_t seg_segment; |
---|
2535 | |
---|
2536 | sd = &c->devices[device].segments[segment]; |
---|
2537 | |
---|
2538 | for (seg_segment = 0; seg_segment < sd->count; seg_segment++, sc++) |
---|
2539 | { |
---|
2540 | sc->descriptor = sd; |
---|
2541 | sc->device = device; |
---|
2542 | sc->segment = seg_segment; |
---|
2543 | sc->erased = 0; |
---|
2544 | } |
---|
2545 | } |
---|
2546 | |
---|
2547 | fd->devices[device].segment_count = segment_count; |
---|
2548 | fd->devices[device].descriptor = &c->devices[device]; |
---|
2549 | } |
---|
2550 | |
---|
2551 | fd->device_count = c->device_count; |
---|
2552 | |
---|
2553 | ret = rtems_fdisk_recover_block_mappings (fd); |
---|
2554 | if (ret) |
---|
2555 | rtems_fdisk_error ("recovery of disk failed: %s (%d)", |
---|
2556 | strerror (ret), ret); |
---|
2557 | |
---|
2558 | ret = rtems_fdisk_compact (fd); |
---|
2559 | if (ret) |
---|
2560 | rtems_fdisk_error ("compacting of disk failed: %s (%d)", |
---|
2561 | strerror (ret), ret); |
---|
2562 | } |
---|
2563 | |
---|
2564 | rtems_flashdisk_count = rtems_flashdisk_configuration_size; |
---|
2565 | |
---|
2566 | return RTEMS_SUCCESSFUL; |
---|
2567 | } |
---|