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/**************************************************************************/ |
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2 |
/* */ |
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3 |
/* Copyright (c) Microsoft Corporation. All rights reserved. */ |
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4 |
/* */ |
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5 |
/* This software is licensed under the Microsoft Software License */ |
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6 |
/* Terms for Microsoft Azure RTOS. Full text of the license can be */ |
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7 |
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ |
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8 |
/* and in the root directory of this software. */ |
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9 |
/* */ |
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10 |
/**************************************************************************/ |
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11 |
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12 |
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13 |
/**************************************************************************/ |
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14 |
/**************************************************************************/ |
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15 |
/** */ |
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16 |
/** FileX Component */ |
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17 |
/** */ |
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18 |
/** Application Utility */ |
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19 |
/** */ |
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20 |
/**************************************************************************/ |
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21 |
/**************************************************************************/ |
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22 |
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23 |
#define FX_SOURCE_CODE |
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24 |
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25 |
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26 |
/* Include necessary system files. */ |
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27 |
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28 |
#include "fx_api.h" |
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29 |
#include "fx_utility.h" |
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30 |
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31 |
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32 |
/* Define internal data structures. */ |
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33 |
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34 |
typedef struct FX_MEDIA_PARTITION_STRUCT |
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35 |
{ |
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36 |
ULONG fx_media_part_start; |
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37 |
ULONG fx_media_part_size; |
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38 |
} FX_MEDIA_PARTITION; |
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39 |
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40 |
/* Define internal partition constants. */ |
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41 |
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42 |
#ifndef FX_MAX_PARTITION_COUNT |
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43 |
#define FX_MAX_PARTITION_COUNT 16 |
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44 |
#endif /* FX_MAX_PARTITION_COUNT */ |
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45 |
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46 |
#define FX_PARTITION_TABLE_OFFSET 446 |
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47 |
#define FX_PARTITION_ENTRY_SIZE 16 |
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48 |
#define FX_PARTITION_TYPE_OFFSET 4 |
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49 |
#define FX_PARTITION_LBA_OFFSET 8 |
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50 |
#define FX_PARTITION_SECTORS_OFFSET 12 |
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51 |
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52 |
#define FX_PARTITION_TYPE_FREE 0x00 |
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53 |
#define FX_PARTITION_TYPE_EXTENDED 0x05 |
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54 |
#define FX_PARTITION_TYPE_EXTENDED_LBA 0x0F |
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55 |
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56 |
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57 |
/* Define function prototypes for the partition table parsing application |
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58 |
utility. */ |
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59 |
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60 |
UINT _fx_partition_offset_calculate(void *partition_sector, UINT partition, |
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61 |
ULONG *partition_start, ULONG *partition_size); |
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62 |
UINT _fx_utility_partition_get(FX_MEDIA_PARTITION *partition_table, |
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63 |
UINT *count, ULONG sector, UCHAR *sector_buffer); |
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64 |
UINT _fx_partition_offset_calculate_extended(FX_MEDIA *media_ptr, void *partition_sector, UINT partition, |
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65 |
ULONG *partition_start, ULONG *partition_size); |
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66 |
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67 |
/**************************************************************************/ |
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68 |
/* */ |
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69 |
/* FUNCTION RELEASE */ |
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70 |
/* */ |
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71 |
/* _fx_partition_offset_calculate PORTABLE C */ |
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72 |
/* 6.1.6 */ |
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73 |
/* AUTHOR */ |
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74 |
/* */ |
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75 |
/* William E. Lamie, Microsoft Corporation */ |
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76 |
/* */ |
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77 |
/* DESCRIPTION */ |
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78 |
/* */ |
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79 |
/* This function calculates the sector offset to the specified */ |
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80 |
/* partition. The buffer containing the partition table is also */ |
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81 |
/* supplied to this function. If the buffer supplied is a boot */ |
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82 |
/* record (which could be the case in non-partition systems), this */ |
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83 |
/* function returns an offset of zero, the total sectors, and a */ |
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84 |
/* successful status indicating that the buffer supplied is the boot */ |
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85 |
/* record. Otherwise, if a partition is found, this function returns */ |
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86 |
/* the sector offset to its boot record along with a successful */ |
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87 |
/* status. If the specified partition is not found or the buffer is */ |
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88 |
/* not a partition table or boot record, this function returns an */ |
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89 |
/* error. */ |
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90 |
/* */ |
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91 |
/* Note: Empty partitions have a FX_SUCCESS return code, however their */ |
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92 |
/* starting sector is FX_NULL and the size returned is 0. */ |
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93 |
/* */ |
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94 |
/* INPUT */ |
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95 |
/* */ |
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96 |
/* partition_sector Pointer to buffer containing */ |
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97 |
/* either the partition table */ |
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98 |
/* or the boot sector */ |
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99 |
/* partition Desired partition */ |
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100 |
/* partition_start Return partition start */ |
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101 |
/* partition_size Return partition size */ |
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102 |
/* */ |
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103 |
/* OUTPUT */ |
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104 |
/* */ |
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105 |
/* return status */ |
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106 |
/* */ |
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107 |
/* CALLS */ |
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108 |
/* */ |
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109 |
/* _fx_utility_partition_get Actual partition parsing */ |
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110 |
/* routine */ |
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111 |
/* */ |
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112 |
/* CALLED BY */ |
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113 |
/* */ |
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114 |
/* Application Driver */ |
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115 |
/* */ |
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116 |
/* RELEASE HISTORY */ |
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117 |
/* */ |
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118 |
/* DATE NAME DESCRIPTION */ |
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119 |
/* */ |
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120 |
/* 05-19-2020 William E. Lamie Initial Version 6.0 */ |
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121 |
/* 09-30-2020 William E. Lamie Modified comment(s), */ |
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122 |
/* resulting in version 6.1 */ |
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123 |
/* 04-02-2021 William E. Lamie Modified comment(s), */ |
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124 |
/* ignored signature check for */ |
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125 |
/* no partition situation, */ |
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126 |
/* resulting in version 6.1.6 */ |
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127 |
/* */ |
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128 |
/**************************************************************************/ |
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129 |
28 |
UINT _fx_partition_offset_calculate(void *partition_sector, UINT partition, |
|
130 |
ULONG *partition_start, ULONG *partition_size) |
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131 |
{ |
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132 |
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133 |
FX_MEDIA_PARTITION partition_table[4]; |
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134 |
UINT count; |
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135 |
ULONG64 total_sectors; |
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136 |
UCHAR *partition_sector_ptr; |
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137 |
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138 |
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139 |
/* Setup working pointer and initialize count. */ |
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140 |
28 |
partition_sector_ptr = partition_sector; |
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141 |
28 |
count = 0; |
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142 |
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143 |
/* Check for a real boot sector instead of a partition table. */ |
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144 |
✓✓✓✓ ✓✓ |
28 |
if ((partition_sector_ptr[0] == 0xe9) || ((partition_sector_ptr[0] == 0xeb) && (partition_sector_ptr[2] == 0x90))) |
145 |
{ |
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146 |
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147 |
/* Yes, a real boot sector could be present. */ |
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148 |
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149 |
/* See if there are good values for sectors per FAT. */ |
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150 |
✓✓✓✓ ✓✓✓✓ ✓✓✓✓ |
21 |
if (partition_sector_ptr[0x16] || partition_sector_ptr[0x17] || partition_sector_ptr[0x24] || partition_sector_ptr[0x25] || partition_sector_ptr[0x26] || partition_sector_ptr[0x27]) |
151 |
{ |
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152 |
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153 |
/* There are values for sectors per FAT. */ |
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154 |
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155 |
/* Determine if there is a total sector count. */ |
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156 |
20 |
total_sectors = 0; |
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157 |
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158 |
✓✓✓✓ |
20 |
if (partition_sector_ptr[0x13] || partition_sector_ptr[0x14]) |
159 |
{ |
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160 |
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161 |
/* Calculate the total sectors, FAT12/16. */ |
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162 |
13 |
total_sectors = (((ULONG) partition_sector_ptr[0x14]) << 8) | ((ULONG) partition_sector_ptr[0x13]); |
|
163 |
} |
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164 |
✓✓✓✓ ✓✓✓✓ |
7 |
else if (partition_sector_ptr[0x20] || partition_sector_ptr[0x21] || partition_sector_ptr[0x22] || partition_sector_ptr[0x23]) |
165 |
{ |
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166 |
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167 |
/* Calculate the total sectors, FAT32. */ |
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168 |
6 |
total_sectors = (((ULONG) partition_sector_ptr[0x23]) << 24) | |
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169 |
6 |
(((ULONG) partition_sector_ptr[0x22]) << 16) | |
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170 |
6 |
(((ULONG) partition_sector_ptr[0x21]) << 8) | |
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171 |
6 |
((ULONG) partition_sector_ptr[0x20]); |
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172 |
} |
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173 |
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174 |
/* Determine if there is a total sector count. */ |
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175 |
✓✓ | 20 |
if (total_sectors) |
176 |
{ |
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177 |
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178 |
✓✓ | 19 |
if (partition_start != FX_NULL) |
179 |
{ |
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180 |
/* Return an offset of 0, size of boot record, and a successful status. */ |
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181 |
18 |
*partition_start = 0; |
|
182 |
} |
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183 |
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184 |
/* Determine if the total sectors is required. */ |
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185 |
✓✓ | 19 |
if (partition_size != FX_NULL) |
186 |
{ |
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187 |
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188 |
/* Return the total sectors. */ |
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189 |
18 |
*partition_size = (ULONG)(total_sectors & 0xFFFFFFFF); |
|
190 |
} |
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191 |
|||
192 |
/* Return success! */ |
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193 |
19 |
return(FX_SUCCESS); |
|
194 |
} |
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195 |
} |
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196 |
#ifdef FX_ENABLE_EXFAT |
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197 |
/* See if there are good values for sectors per exFAT. */ |
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198 |
else if (partition_sector_ptr[0x0b] == 0 && partition_sector_ptr[0x0c] == 0) |
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199 |
{ |
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200 |
/* There are values for sectors per exFAT. */ |
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201 |
|||
202 |
/* Calculate the total sectors. */ |
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203 |
total_sectors = _fx_utility_64_unsigned_read(&partition_sector_ptr[FX_EF_VOLUME_LENGTH]); |
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204 |
|||
205 |
/* Determine if there is a total sector count. */ |
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206 |
if (total_sectors) |
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207 |
{ |
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208 |
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209 |
if (partition_start != FX_NULL) |
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210 |
{ |
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211 |
/* Return an offset of 0, size of boot record, and a successful status. */ |
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212 |
*partition_start = 0; |
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213 |
} |
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214 |
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215 |
/* Determine if the total sectors is required. */ |
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216 |
if (partition_size != FX_NULL) |
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217 |
{ |
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218 |
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219 |
if (total_sectors > 0xFFFFFFFF) |
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220 |
{ |
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221 |
|||
222 |
/* Overflow. Just return not found. */ |
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223 |
return(FX_NOT_FOUND); |
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224 |
} |
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225 |
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226 |
/* Return the total sectors. */ |
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227 |
*partition_size = (ULONG)(total_sectors & 0xFFFFFFFF); |
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228 |
} |
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229 |
|||
230 |
/* Return success! */ |
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231 |
return(FX_SUCCESS); |
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232 |
} |
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233 |
} |
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234 |
#endif /* FX_ENABLE_EXFAT */ |
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235 |
} |
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236 |
|||
237 |
/* Check signature to make sure the buffer is valid. */ |
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238 |
✓✓✓✓ |
9 |
if ((partition_sector_ptr[510] != 0x55) || (partition_sector_ptr[511] != 0xAA)) |
239 |
{ |
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240 |
|||
241 |
/* Invalid, return an error. */ |
||
242 |
2 |
return(FX_NOT_FOUND); |
|
243 |
} |
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244 |
|||
245 |
/* Not bootable, look for specific partition. */ |
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246 |
7 |
_fx_utility_partition_get(partition_table, &count, 0, partition_sector_ptr); |
|
247 |
|||
248 |
/* Determine if return value is valid. */ |
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249 |
✓✓ | 7 |
if (partition >= count) |
250 |
{ |
||
251 |
|||
252 |
/* No, return an error. */ |
||
253 |
5 |
return(FX_NOT_FOUND); |
|
254 |
} |
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255 |
|||
256 |
/* Return the partition starting sector, if non-NULL. */ |
||
257 |
✓✓ | 2 |
if (partition_start != FX_NULL) |
258 |
{ |
||
259 |
1 |
*partition_start = partition_table[partition].fx_media_part_start; |
|
260 |
} |
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261 |
|||
262 |
/* Return the partition size, if non-NULL. */ |
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263 |
✓✓ | 2 |
if (partition_size != FX_NULL) |
264 |
{ |
||
265 |
1 |
*partition_size = partition_table[partition].fx_media_part_size; |
|
266 |
} |
||
267 |
|||
268 |
/* Return successful completion. */ |
||
269 |
2 |
return(FX_SUCCESS); |
|
270 |
} |
||
271 |
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272 |
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273 |
/**************************************************************************/ |
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274 |
/* */ |
||
275 |
/* FUNCTION RELEASE */ |
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276 |
/* */ |
||
277 |
/* _fx_utility_partition_get PORTABLE C */ |
||
278 |
/* 6.1.6 */ |
||
279 |
/* AUTHOR */ |
||
280 |
/* */ |
||
281 |
/* William E. Lamie, Microsoft Corporation */ |
||
282 |
/* */ |
||
283 |
/* DESCRIPTION */ |
||
284 |
/* */ |
||
285 |
/* This function parses the partition sector and completes the */ |
||
286 |
/* supplied partition entry structure. */ |
||
287 |
/* */ |
||
288 |
/* INPUT */ |
||
289 |
/* */ |
||
290 |
/* partition_table Pointer to partition table */ |
||
291 |
/* count Number of partitions found */ |
||
292 |
/* sector Base sector */ |
||
293 |
/* sector_buffer Buffer containing partition */ |
||
294 |
/* table */ |
||
295 |
/* */ |
||
296 |
/* OUTPUT */ |
||
297 |
/* */ |
||
298 |
/* return status */ |
||
299 |
/* */ |
||
300 |
/* CALLS */ |
||
301 |
/* */ |
||
302 |
/* None */ |
||
303 |
/* */ |
||
304 |
/* CALLED BY */ |
||
305 |
/* */ |
||
306 |
/* _fx_partition_offset_calculate Calculate partition offset */ |
||
307 |
/* */ |
||
308 |
/* RELEASE HISTORY */ |
||
309 |
/* */ |
||
310 |
/* DATE NAME DESCRIPTION */ |
||
311 |
/* */ |
||
312 |
/* 05-19-2020 William E. Lamie Initial Version 6.0 */ |
||
313 |
/* 09-30-2020 William E. Lamie Modified comment(s), */ |
||
314 |
/* resulting in version 6.1 */ |
||
315 |
/* 04-02-2021 William E. Lamie Modified comment(s), */ |
||
316 |
/* resulting in version 6.1.6 */ |
||
317 |
/* */ |
||
318 |
/**************************************************************************/ |
||
319 |
7 |
UINT _fx_utility_partition_get(FX_MEDIA_PARTITION *partition_table, |
|
320 |
UINT *count, ULONG sector, UCHAR *sector_buffer) |
||
321 |
{ |
||
322 |
|||
323 |
UINT i; |
||
324 |
ULONG base_sector, value; |
||
325 |
|||
326 |
/* This parameter has not been supported yet. */ |
||
327 |
FX_PARAMETER_NOT_USED(sector); |
||
328 |
|||
329 |
/* Initialize base sector. */ |
||
330 |
7 |
base_sector = 0; |
|
331 |
|||
332 |
✓✓ | 35 |
for(i = 446; i <= 494; i+=16) |
333 |
{ |
||
334 |
✓✓ | 28 |
if (sector_buffer[i + 4] == 0) /* no partition entry here */ |
335 |
{ |
||
336 |
|||
337 |
21 |
partition_table[*count].fx_media_part_start = 0; |
|
338 |
21 |
partition_table[*count].fx_media_part_size = 0; |
|
339 |
} |
||
340 |
else |
||
341 |
{ |
||
342 |
|||
343 |
7 |
value = (ULONG) sector_buffer[i + 8]; /* little endian start value */ |
|
344 |
7 |
value = (((ULONG) sector_buffer[i + 9]) << 8) | value; |
|
345 |
7 |
value = (((ULONG) sector_buffer[i + 10]) << 16) | value; |
|
346 |
7 |
value = (((ULONG) sector_buffer[i + 11]) << 24) | value; |
|
347 |
7 |
partition_table[*count].fx_media_part_start = value + base_sector; |
|
348 |
|||
349 |
7 |
value = (ULONG) sector_buffer[i + 12]; /* little endian size value */ |
|
350 |
7 |
value = (((ULONG) sector_buffer[i + 13]) << 8) | value; |
|
351 |
7 |
value = (((ULONG) sector_buffer[i + 14]) << 16) | value; |
|
352 |
7 |
value = (((ULONG) sector_buffer[i + 15]) << 24) | value; |
|
353 |
7 |
partition_table[*count].fx_media_part_size = value; |
|
354 |
} |
||
355 |
|||
356 |
28 |
(*count)++; |
|
357 |
} |
||
358 |
|||
359 |
/* Return success. */ |
||
360 |
7 |
return(FX_SUCCESS); |
|
361 |
} |
||
362 |
|||
363 |
/**************************************************************************/ |
||
364 |
/* */ |
||
365 |
/* FUNCTION RELEASE */ |
||
366 |
/* */ |
||
367 |
/* _fx_partition_offset_calculate_extended PORTABLE C */ |
||
368 |
/* 6.2.0 */ |
||
369 |
/* AUTHOR */ |
||
370 |
/* */ |
||
371 |
/* Xiuwen Cai, Microsoft Corporation */ |
||
372 |
/* */ |
||
373 |
/* DESCRIPTION */ |
||
374 |
/* */ |
||
375 |
/* This function calculates the sector offset to the specified */ |
||
376 |
/* partition. The buffer containing the partition table is also */ |
||
377 |
/* supplied to this function. If the buffer supplied is a boot */ |
||
378 |
/* record (which could be the case in non-partition systems), this */ |
||
379 |
/* function returns an offset of zero, the total sectors, and a */ |
||
380 |
/* successful status indicating that the buffer supplied is the boot */ |
||
381 |
/* record. Otherwise, if a partition is found, this function returns */ |
||
382 |
/* the sector offset to its boot record along with a successful */ |
||
383 |
/* status. If the specified partition is not found or the buffer is */ |
||
384 |
/* not a partition table or boot record, this function returns an */ |
||
385 |
/* error. */ |
||
386 |
/* */ |
||
387 |
/* Note: Empty partitions have a FX_NOT_FOUND return code. */ |
||
388 |
/* Use partition index 0 to 3 for primary partition and index 4 to */ |
||
389 |
/* FX_MAX_PARTITION_COUNT for extended partition. */ |
||
390 |
/* */ |
||
391 |
/* INPUT */ |
||
392 |
/* */ |
||
393 |
/* media_ptr Media control block pointer */ |
||
394 |
/* partition_sector Pointer to buffer containing */ |
||
395 |
/* either the partition table */ |
||
396 |
/* or the boot sector */ |
||
397 |
/* partition Desired partition */ |
||
398 |
/* partition_start Return partition start */ |
||
399 |
/* partition_size Return partition size */ |
||
400 |
/* */ |
||
401 |
/* OUTPUT */ |
||
402 |
/* */ |
||
403 |
/* return status */ |
||
404 |
/* */ |
||
405 |
/* CALLS */ |
||
406 |
/* */ |
||
407 |
/* _fx_utility_16_unsigned_read Read a USHORT from memory */ |
||
408 |
/* _fx_utility_32_unsigned_read Read a ULONG from memory */ |
||
409 |
/* _fx_utility_64_unsigned_read Read a ULONG64 from memory */ |
||
410 |
/* Media driver */ |
||
411 |
/* */ |
||
412 |
/* CALLED BY */ |
||
413 |
/* */ |
||
414 |
/* Application Driver */ |
||
415 |
/* */ |
||
416 |
/* RELEASE HISTORY */ |
||
417 |
/* */ |
||
418 |
/* DATE NAME DESCRIPTION */ |
||
419 |
/* */ |
||
420 |
/* 10-31-2022 Xiuwen Cai Initial Version 6.2.0 */ |
||
421 |
/* */ |
||
422 |
/**************************************************************************/ |
||
423 |
UINT _fx_partition_offset_calculate_extended(FX_MEDIA *media_ptr, void *partition_sector, UINT partition, |
||
424 |
ULONG *partition_start, ULONG *partition_size) |
||
425 |
{ |
||
426 |
|||
427 |
ULONG64 total_sectors; |
||
428 |
UCHAR *partition_sector_ptr; |
||
429 |
UCHAR partition_type; |
||
430 |
UINT i; |
||
431 |
ULONG base_sector; |
||
432 |
ULONG base_sector_extended; |
||
433 |
|||
434 |
|||
435 |
/* Setup working pointer. */ |
||
436 |
partition_sector_ptr = partition_sector; |
||
437 |
|||
438 |
/* Check for a real boot sector instead of a partition table. */ |
||
439 |
if ((partition_sector_ptr[0] == 0xe9) || ((partition_sector_ptr[0] == 0xeb) && (partition_sector_ptr[2] == 0x90))) |
||
440 |
{ |
||
441 |
|||
442 |
/* Yes, a real boot sector could be present. */ |
||
443 |
|||
444 |
/* See if there are good values for sectors per FAT. */ |
||
445 |
if (partition_sector_ptr[0x16] || partition_sector_ptr[0x17] || partition_sector_ptr[0x24] || partition_sector_ptr[0x25] || partition_sector_ptr[0x26] || partition_sector_ptr[0x27]) |
||
446 |
{ |
||
447 |
|||
448 |
/* There are values for sectors per FAT. */ |
||
449 |
|||
450 |
/* Get the total sectors, FAT12/16. */ |
||
451 |
total_sectors = _fx_utility_16_unsigned_read(&partition_sector_ptr[FX_SECTORS]); |
||
452 |
|||
453 |
if (total_sectors == 0) |
||
454 |
{ |
||
455 |
|||
456 |
/* Get the total sectors, FAT32. */ |
||
457 |
total_sectors = _fx_utility_32_unsigned_read(&partition_sector_ptr[FX_HUGE_SECTORS]); |
||
458 |
} |
||
459 |
|||
460 |
/* Determine if there is a total sector count. */ |
||
461 |
if (total_sectors) |
||
462 |
{ |
||
463 |
|||
464 |
if (partition_start != FX_NULL) |
||
465 |
{ |
||
466 |
/* Return an offset of 0, size of boot record, and a successful status. */ |
||
467 |
*partition_start = 0; |
||
468 |
} |
||
469 |
|||
470 |
/* Determine if the total sectors is required. */ |
||
471 |
if (partition_size != FX_NULL) |
||
472 |
{ |
||
473 |
|||
474 |
/* Return the total sectors. */ |
||
475 |
*partition_size = (ULONG)(total_sectors & 0xFFFFFFFF); |
||
476 |
} |
||
477 |
|||
478 |
/* Return success! */ |
||
479 |
return(FX_SUCCESS); |
||
480 |
} |
||
481 |
} |
||
482 |
#ifdef FX_ENABLE_EXFAT |
||
483 |
/* See if there are good values for sectors per exFAT. */ |
||
484 |
else if (partition_sector_ptr[0x0b] == 0 && partition_sector_ptr[0x0c] == 0) |
||
485 |
{ |
||
486 |
/* There are values for sectors per exFAT. */ |
||
487 |
|||
488 |
/* Calculate the total sectors. */ |
||
489 |
total_sectors = _fx_utility_64_unsigned_read(&partition_sector_ptr[FX_EF_VOLUME_LENGTH]); |
||
490 |
|||
491 |
/* Determine if there is a total sector count. */ |
||
492 |
if (total_sectors) |
||
493 |
{ |
||
494 |
|||
495 |
if (partition_start != FX_NULL) |
||
496 |
{ |
||
497 |
/* Return an offset of 0, size of boot record, and a successful status. */ |
||
498 |
*partition_start = 0; |
||
499 |
} |
||
500 |
|||
501 |
/* Determine if the total sectors is required. */ |
||
502 |
if (partition_size != FX_NULL) |
||
503 |
{ |
||
504 |
|||
505 |
if (total_sectors > 0xFFFFFFFF) |
||
506 |
{ |
||
507 |
|||
508 |
/* Overflow. Just return not found. */ |
||
509 |
return(FX_NOT_FOUND); |
||
510 |
} |
||
511 |
|||
512 |
/* Return the total sectors. */ |
||
513 |
*partition_size = (ULONG)(total_sectors & 0xFFFFFFFF); |
||
514 |
} |
||
515 |
|||
516 |
/* Return success! */ |
||
517 |
return(FX_SUCCESS); |
||
518 |
} |
||
519 |
} |
||
520 |
#endif /* FX_ENABLE_EXFAT */ |
||
521 |
} |
||
522 |
|||
523 |
/* Check signature to make sure the buffer is valid. */ |
||
524 |
if ((partition_sector_ptr[510] != FX_SIG_BYTE_1) || (partition_sector_ptr[511] != FX_SIG_BYTE_2)) |
||
525 |
{ |
||
526 |
|||
527 |
/* Invalid, return an error. */ |
||
528 |
return(FX_NOT_FOUND); |
||
529 |
} |
||
530 |
|||
531 |
/* Not bootable, look for specific partition. */ |
||
532 |
|||
533 |
/* Check if primary partitions are addressed. */ |
||
534 |
if (partition < 4) |
||
535 |
{ |
||
536 |
|||
537 |
/* Get partition type. */ |
||
538 |
partition_type = partition_sector_ptr[FX_PARTITION_TABLE_OFFSET + partition * FX_PARTITION_ENTRY_SIZE + FX_PARTITION_TYPE_OFFSET]; |
||
539 |
|||
540 |
/* Check if there is a vaild partition. */ |
||
541 |
if (partition_type != FX_PARTITION_TYPE_FREE) |
||
542 |
{ |
||
543 |
|||
544 |
/* Return the partition starting sector, if non-NULL. */ |
||
545 |
if (partition_start != FX_NULL) |
||
546 |
{ |
||
547 |
*partition_start = _fx_utility_32_unsigned_read(&partition_sector_ptr[FX_PARTITION_TABLE_OFFSET + partition * FX_PARTITION_ENTRY_SIZE + FX_PARTITION_LBA_OFFSET]); |
||
548 |
} |
||
549 |
|||
550 |
/* Return the partition size, if non-NULL. */ |
||
551 |
if (partition_size != FX_NULL) |
||
552 |
{ |
||
553 |
*partition_size = _fx_utility_32_unsigned_read(&partition_sector_ptr[FX_PARTITION_TABLE_OFFSET + partition * FX_PARTITION_ENTRY_SIZE + FX_PARTITION_SECTORS_OFFSET]); |
||
554 |
} |
||
555 |
|||
556 |
/* Return success! */ |
||
557 |
return(FX_SUCCESS); |
||
558 |
} |
||
559 |
else |
||
560 |
{ |
||
561 |
|||
562 |
/* Not partition here. */ |
||
563 |
return(FX_NOT_FOUND); |
||
564 |
} |
||
565 |
} |
||
566 |
|||
567 |
/* Check for invalid parameter. */ |
||
568 |
if (partition > FX_MAX_PARTITION_COUNT) |
||
569 |
{ |
||
570 |
|||
571 |
/* Return error. */ |
||
572 |
return(FX_NOT_FOUND); |
||
573 |
} |
||
574 |
|||
575 |
base_sector = 0; |
||
576 |
|||
577 |
/* Loop to find the extended partition table. */ |
||
578 |
for(i = FX_PARTITION_TABLE_OFFSET; i <= FX_PARTITION_TABLE_OFFSET + 3 * FX_PARTITION_ENTRY_SIZE; i += FX_PARTITION_ENTRY_SIZE) |
||
579 |
{ |
||
580 |
|||
581 |
/* Get partition type. */ |
||
582 |
partition_type = partition_sector_ptr[i + FX_PARTITION_TYPE_OFFSET]; |
||
583 |
if (partition_type == FX_PARTITION_TYPE_EXTENDED || partition_type == FX_PARTITION_TYPE_EXTENDED_LBA) |
||
584 |
{ |
||
585 |
base_sector = _fx_utility_32_unsigned_read(&partition_sector_ptr[i + FX_PARTITION_LBA_OFFSET]); |
||
586 |
break; |
||
587 |
} |
||
588 |
} |
||
589 |
|||
590 |
if (base_sector == 0) |
||
591 |
{ |
||
592 |
|||
593 |
/* No extended partition. */ |
||
594 |
return(FX_NOT_FOUND); |
||
595 |
} |
||
596 |
|||
597 |
base_sector_extended = base_sector; |
||
598 |
|||
599 |
for (i = 4; i <= partition; i++) |
||
600 |
{ |
||
601 |
|||
602 |
/* Read the partition sector from the device. Build the read sector |
||
603 |
command. */ |
||
604 |
media_ptr -> fx_media_driver_request = FX_DRIVER_READ; |
||
605 |
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
||
606 |
media_ptr -> fx_media_driver_buffer = partition_sector_ptr; |
||
607 |
media_ptr -> fx_media_driver_logical_sector = base_sector; |
||
608 |
media_ptr -> fx_media_driver_sectors = 1; |
||
609 |
media_ptr -> fx_media_driver_sector_type = FX_UNKNOWN_SECTOR; |
||
610 |
media_ptr -> fx_media_hidden_sectors = 0; |
||
611 |
|||
612 |
/* Invoke the driver to read the sector. */ |
||
613 |
(media_ptr -> fx_media_driver_entry) (media_ptr); |
||
614 |
|||
615 |
/* Determine if the sector was read correctly. */ |
||
616 |
if (media_ptr -> fx_media_driver_status != FX_SUCCESS) |
||
617 |
{ |
||
618 |
|||
619 |
/* Return error. */ |
||
620 |
return(FX_IO_ERROR); |
||
621 |
} |
||
622 |
|||
623 |
/* Check signature to make sure the sector is valid. */ |
||
624 |
if ((partition_sector_ptr[510] != FX_SIG_BYTE_1) || (partition_sector_ptr[511] != FX_SIG_BYTE_2)) |
||
625 |
{ |
||
626 |
|||
627 |
/* Invalid, return an error. */ |
||
628 |
return(FX_NOT_FOUND); |
||
629 |
} |
||
630 |
|||
631 |
/* Determine if this is the desired partition. */ |
||
632 |
if (i == partition) |
||
633 |
{ |
||
634 |
|||
635 |
/* Get partition type. */ |
||
636 |
partition_type = partition_sector_ptr[FX_PARTITION_TABLE_OFFSET + FX_PARTITION_TYPE_OFFSET]; |
||
637 |
if (partition_type != FX_PARTITION_TYPE_FREE) |
||
638 |
{ |
||
639 |
|||
640 |
/* Return the partition starting sector, if non-NULL. */ |
||
641 |
if (partition_start != FX_NULL) |
||
642 |
{ |
||
643 |
*partition_start = _fx_utility_32_unsigned_read(&partition_sector_ptr[FX_PARTITION_TABLE_OFFSET + FX_PARTITION_LBA_OFFSET]) + base_sector; |
||
644 |
} |
||
645 |
|||
646 |
/* Return the partition size, if non-NULL. */ |
||
647 |
if (partition_size != FX_NULL) |
||
648 |
{ |
||
649 |
*partition_size = _fx_utility_32_unsigned_read(&partition_sector_ptr[FX_PARTITION_TABLE_OFFSET + FX_PARTITION_SECTORS_OFFSET]); |
||
650 |
} |
||
651 |
|||
652 |
/* Return success! */ |
||
653 |
return(FX_SUCCESS); |
||
654 |
} |
||
655 |
else |
||
656 |
{ |
||
657 |
/* Not partition here. */ |
||
658 |
return(FX_NOT_FOUND); |
||
659 |
} |
||
660 |
} |
||
661 |
else |
||
662 |
{ |
||
663 |
|||
664 |
/* Get partition type. */ |
||
665 |
partition_type = partition_sector_ptr[FX_PARTITION_TABLE_OFFSET + FX_PARTITION_ENTRY_SIZE + FX_PARTITION_TYPE_OFFSET]; |
||
666 |
if (partition_type == FX_PARTITION_TYPE_EXTENDED || partition_type == FX_PARTITION_TYPE_EXTENDED_LBA) |
||
667 |
{ |
||
668 |
|||
669 |
/* Update sector number for next partition table. */ |
||
670 |
base_sector = _fx_utility_32_unsigned_read(&partition_sector_ptr[FX_PARTITION_TABLE_OFFSET + FX_PARTITION_ENTRY_SIZE + FX_PARTITION_LBA_OFFSET]) + base_sector_extended; |
||
671 |
} |
||
672 |
else |
||
673 |
{ |
||
674 |
/* No valid partition, get out of the loop. */ |
||
675 |
break; |
||
676 |
} |
||
677 |
} |
||
678 |
|||
679 |
} |
||
680 |
|||
681 |
/* Return error. */ |
||
682 |
return(FX_NOT_FOUND); |
||
683 |
} |
| Generated by: GCOVR (Version 4.1) |