[530] | 1 | //////////////////////////////////////////////////////////////////////////////// |
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[258] | 2 | // File : fat32.h |
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| 3 | // Date : 01/09/2013 |
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[587] | 4 | // Author : Alain Greiner / Marco Jankovic |
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[258] | 5 | // Copyright (c) UPMC-LIP6 |
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[530] | 6 | //////////////////////////////////////////////////////////////////////////////// |
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[258] | 7 | |
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| 8 | #ifndef _FAT32_H |
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| 9 | #define _FAT32_H |
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| 10 | |
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[663] | 11 | #include "fat32_shared.h" |
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[258] | 12 | #include "giet_config.h" |
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[503] | 13 | #include "kernel_locks.h" |
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[707] | 14 | #include "mapping_info.h" |
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[258] | 15 | |
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[530] | 16 | /*************** Partition Boot Sector Format **********************************/ |
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[258] | 17 | // offset | length |
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| 18 | #define BS_JMPBOOT 0 , 3 |
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| 19 | #define BS_OEMNAME 3 , 8 |
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| 20 | #define BPB_BYTSPERSEC 11 , 2 |
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| 21 | #define BPB_SECPERCLUS 13 , 1 |
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| 22 | #define BPB_RSVDSECCNT 14 , 2 |
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| 23 | #define BPB_NUMFATS 16 , 1 |
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| 24 | #define BPB_ROOTENTCNT 17 , 2 |
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| 25 | #define BPB_TOTSEC16 19 , 2 |
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| 26 | #define BPB_MEDIA 21 , 1 |
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| 27 | #define BPB_FATSZ16 22 , 2 |
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| 28 | #define BPB_SECPERTRK 24 , 2 |
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| 29 | #define BPB_NUMHEADS 26 , 2 |
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| 30 | #define BPB_HIDDSEC 28 , 4 |
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| 31 | #define BPB_TOTSEC32 32 , 4 |
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| 32 | #define BPB_PARTITION_TABLE 446 , 64 |
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| 33 | |
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| 34 | // FAT 32 |
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| 35 | #define BPB_FAT32_FATSZ32 36 , 4 |
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| 36 | #define BPB_FAT32_EXTFLAGS 40 , 2 |
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| 37 | #define BPB_FAT32_FSVER 42 , 2 |
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| 38 | #define BPB_FAT32_ROOTCLUS 44 , 4 |
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| 39 | #define BPB_FAT32_FSINFO 48 , 2 |
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| 40 | #define BPB_FAT32_BKBOOTSEC 50 , 2 |
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| 41 | #define BS_FAT32_DRVNUM 64 , 1 |
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| 42 | #define BS_FAT32_BOOTSIG 66 , 1 |
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| 43 | #define BS_FAT32_VOLID 67 , 4 |
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| 44 | #define BS_FAT32_VOLLAB 71 , 11 |
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| 45 | #define BS_FAT32_FILSYSTYPE 82 , 8 |
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| 46 | |
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| 47 | // Partitions |
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| 48 | #define FIRST_PARTITION_ACTIVE 446 , 8 |
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| 49 | #define FIRST_PARTITION_BEGIN_LBA 454 , 4 |
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| 50 | #define FIRST_PARTITION_SIZE 458 , 4 |
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| 51 | #define SECOND_PARTITION_ACTIVE 462 , 8 |
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| 52 | #define SECOND_PARTITION_BEGIN_LBA 470 , 4 |
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| 53 | #define SECOND_PARTITION_SIZE 474 , 4 |
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| 54 | #define THIRD_PARTITION_ACTIVE 478 , 8 |
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| 55 | #define THIRD_PARTITION_BEGIN_LBA 486 , 4 |
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| 56 | #define THIRD_PARTITION_SIZE 490 , 4 |
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| 57 | #define FOURTH_PARTITION_ACTIVE 494 , 8 |
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| 58 | #define FOURTH_PARTITION_BEGIN_LBA 502 , 4 |
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| 59 | #define FOURTH_PARTITION_SIZE 506 , 4 |
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[530] | 60 | /*******************************************************************************/ |
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[258] | 61 | |
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| 62 | #define MBR_SIGNATURE_POSITION 510 , 2 |
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| 63 | #define MBR_SIGNATURE_VALUE 0xAA55 |
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| 64 | |
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[530] | 65 | /************** FAT_FS_INFO SECTOR ********************************************/ |
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[258] | 66 | #define FS_SIGNATURE_VALUE_1 0x52526141 |
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| 67 | #define FS_SIGNATURE_VALUE_2 0x72724161 |
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| 68 | #define FS_SIGNATURE_VALUE_3 0x000055AA |
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| 69 | #define FS_SIGNATURE_POSITION_1 0 , 4 |
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| 70 | #define FS_SIGNATURE_POSITION_2 484 , 4 |
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| 71 | #define FS_SIGNATURE_POSITION_3 508 , 4 |
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[587] | 72 | #define FS_FREE_CLUSTERS 488 , 4 |
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[291] | 73 | #define FS_FREE_CLUSTER_HINT 492 , 4 |
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[530] | 74 | /*******************************************************************************/ |
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[258] | 75 | |
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| 76 | #define DIR_ENTRY_SIZE 32 |
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| 77 | |
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[587] | 78 | #define NAME_MAX_SIZE 31 |
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| 79 | |
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[530] | 80 | /******* Directory Entry Structure (32 bytes) **********************************/ |
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[587] | 81 | // offset | length |
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| 82 | #define DIR_NAME 0 , 11 // dir_entry name |
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| 83 | #define DIR_ATTR 11 , 1 // attributes |
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| 84 | #define DIR_NTRES 12 , 1 // reserved for the OS |
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| 85 | #define DIR_CRT_TIMES_TENTH 13 , 1 |
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| 86 | #define DIR_FST_CLUS_HI 20 , 2 // cluster index 16 MSB bits |
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| 87 | #define DIR_WRT_TIME 22 , 2 // time of last write |
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| 88 | #define DIR_WRT_DATE 24 , 2 // date of last write |
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| 89 | #define DIR_FST_CLUS_LO 26 , 2 // cluster index 16 LSB bit |
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| 90 | #define DIR_FILE_SIZE 28 , 4 // file size (up to 4 giga bytes) |
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[530] | 91 | /*******************************************************************************/ |
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[258] | 92 | |
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[530] | 93 | /******* LFN Directory Entry Structure (32 bytes) *****************************/ |
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[587] | 94 | // offset | length |
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| 95 | #define LDIR_ORD 0 , 1 // Sequence number (from 0x01 to 0x0f) |
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| 96 | #define LDIR_NAME_1 1 , 10 // name broken into 3 parts |
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| 97 | #define LDIR_ATTR 11 , 1 // attributes (must be 0x0F) |
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| 98 | #define LDIR_TYPE 12 , 1 // directory type (must be 0x00) |
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| 99 | #define LDIR_CHKSUM 13 , 1 // checksum of name in short dir |
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| 100 | #define LDIR_NAME_2 14 , 12 |
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| 101 | #define LDIR_RSVD 26 , 2 // artifact of previous fat (must be 0) |
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| 102 | #define LDIR_NAME_3 28 , 4 |
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[530] | 103 | /*******************************************************************************/ |
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[258] | 104 | |
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[530] | 105 | /*********************** DIR_ATTR values (attributes) ************************/ |
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[587] | 106 | #define ATTR_READ_ONLY 0x01 |
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| 107 | #define ATTR_HIDDEN 0x02 |
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| 108 | #define ATTR_SYSTEM 0x04 |
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| 109 | #define ATTR_VOLUME_ID 0x08 |
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| 110 | #define ATTR_DIRECTORY 0x10 |
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| 111 | #define ATTR_ARCHIVE 0x20 |
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| 112 | #define ATTR_LONG_NAME_MASK 0x0f // READ_ONLY|HIDDEN|SYSTEM|VOLUME_ID |
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[530] | 113 | /*******************************************************************************/ |
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[258] | 114 | |
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[530] | 115 | /********************* DIR_ORD special values **********************************/ |
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[587] | 116 | #define FREE_ENTRY 0xE5 // this entry is free in the directory |
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| 117 | #define NO_MORE_ENTRY 0x00 // no more entry in the directory |
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[530] | 118 | /*******************************************************************************/ |
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[258] | 119 | |
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[530] | 120 | /******************** CLuster Index Special Values *****************************/ |
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[587] | 121 | #define FREE_CLUSTER 0x00000000 |
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| 122 | #define RESERVED_CLUSTER 0x00000001 |
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| 123 | #define BAD_CLUSTER 0x0FFFFFF7 |
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| 124 | #define END_OF_CHAIN_CLUSTER_MIN 0x0ffffff8 |
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| 125 | #define END_OF_CHAIN_CLUSTER_MAX 0x0fffffff |
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[530] | 126 | /*******************************************************************************/ |
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[258] | 127 | |
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[674] | 128 | #define FAT_INITIALIZED 0xBABEF00D |
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[587] | 129 | |
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| 130 | /******************************************************************************** |
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| 131 | This struct defines a non terminal node in a 64-tree implementing a File-Cache |
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| 132 | associated to an open file, or the Fat-Cache, associated to the FAT itself. |
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| 133 | Each node has 64 children, and we use the void* type, because the children |
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| 134 | can be non-terminal (fat_cache_node_t) or terminal (fat_cache_cluster_t). |
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| 135 | ********************************************************************************/ |
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| 136 | |
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| 137 | typedef struct fat_cache_node_s |
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[258] | 138 | { |
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[587] | 139 | void* children[64]; // pointers on the 64 children |
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| 140 | } fat_cache_node_t; |
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[258] | 141 | |
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[587] | 142 | |
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| 143 | /******************************************************************************** |
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| 144 | This struct defines a cluster descriptor, that is a leaf cell in a 64-tree. |
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| 145 | Each cluster descriptor contains a pointer on a 4K bytes buffer, and the |
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| 146 | lba on block device. |
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| 147 | ********************************************************************************/ |
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| 148 | |
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| 149 | typedef struct fat_cache_desc_s |
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[258] | 150 | { |
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[587] | 151 | unsigned int lba; // cluster lba on block device |
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| 152 | unsigned int dirty; // modified if non zero |
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| 153 | unsigned char* buffer; // pointer on the 4 Kbytes buffer |
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| 154 | } fat_cache_desc_t; |
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[258] | 155 | |
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[587] | 156 | |
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| 157 | /******************************************************************************** |
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| 158 | This struct defines a file/directory inode / size = 64 bytes |
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| 159 | ********************************************************************************/ |
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| 160 | |
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| 161 | typedef struct fat_inode_s |
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| 162 | { |
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| 163 | struct fat_inode_s* parent; // parent directory inode |
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| 164 | struct fat_inode_s* next; // next inode in same directory |
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| 165 | struct fat_inode_s* child; // first children inode (dir only) |
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| 166 | fat_cache_node_t* cache; // pointer on the file_cache root |
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| 167 | unsigned int cluster; // first cluster index in FAT |
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| 168 | unsigned int size; // number of bytes (file only) |
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| 169 | unsigned int count; // number open if file / 0 if dir |
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| 170 | unsigned short dentry; // directory entry index in parent |
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| 171 | unsigned char levels; // number of levels in file_cache |
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| 172 | unsigned char is_dir; // directory if non zero |
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| 173 | char name[32]; // file directory name |
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| 174 | } fat_inode_t; |
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| 175 | |
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| 176 | /******************************************************************************** |
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| 177 | This struct defines a file descriptor (handler) / size = 16 bytes |
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| 178 | ********************************************************************************/ |
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| 179 | |
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| 180 | typedef struct fat_file_desc_s |
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| 181 | { |
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| 182 | unsigned int seek; // current offset value (bytes) |
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| 183 | fat_inode_t* inode; // pointer on inode |
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| 184 | char allocated; // file descriptor allocated |
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| 185 | char read_only; // write protected |
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| 186 | char reserved[6]; // reserved |
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| 187 | } fat_file_desc_t; |
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| 188 | |
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| 189 | /******************************************************************************** |
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| 190 | This struct defines a FAT32 File system descriptor |
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| 191 | *******************************************************************************/ |
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| 192 | |
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| 193 | typedef struct fat_desc_s |
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| 194 | { |
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| 195 | unsigned char block_buffer[512]; // one block buffer (for FS_INFO) |
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| 196 | fat_file_desc_t fd[GIET_OPEN_FILES_MAX]; // file descriptors array |
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| 197 | spin_lock_t fat_lock; // global lock protecting FAT |
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| 198 | fat_inode_t* inode_tree_root; // Inode-Tree root pointer |
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| 199 | fat_cache_node_t* fat_cache_root; // Fat_Cache root pointer |
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| 200 | unsigned int fat_cache_levels; // number of levels in Fat-Cache |
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| 201 | unsigned int block_buffer_lba; // lba of block in block_buffer |
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[674] | 202 | unsigned int initialized; // 0xBABEF00D when FAT initialized |
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[587] | 203 | unsigned int sector_size; // must be 512 |
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| 204 | unsigned int cluster_size; // must be 4096 |
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| 205 | unsigned int fat_lba; // lba of first FAT sector |
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| 206 | unsigned int fat_sectors; // number of sectors in FAT region |
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| 207 | unsigned int data_lba; // lba of first DATA sector |
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| 208 | unsigned int data_sectors; // number of sectors inf DATA region |
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| 209 | unsigned int fs_info_lba; // lba of fs_info |
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| 210 | unsigned int first_free_cluster; // free cluster with smallest index |
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| 211 | unsigned int free_clusters_number; // total number of free clusters |
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| 212 | } fat_desc_t; |
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| 213 | |
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| 214 | |
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[530] | 215 | /*********************** Extern Functions *************************************/ |
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[258] | 216 | |
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[587] | 217 | extern int _fat_init(); |
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[258] | 218 | |
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[587] | 219 | extern int _fat_open( char* pathname, // path from root |
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| 220 | unsigned int flags ); // O_CREATE/O_RDONLY |
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[258] | 221 | |
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[587] | 222 | extern int _fat_close( unsigned int fd_id ); // file descriptor |
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[258] | 223 | |
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[658] | 224 | extern int _fat_file_info( unsigned int fd_id, // file descriptor |
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| 225 | fat_file_info_t* info ); // file info struct |
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[258] | 226 | |
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[587] | 227 | extern int _fat_read( unsigned int fd_id, // file descriptor |
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[709] | 228 | unsigned int vaddr, // destination buffer |
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[707] | 229 | unsigned int count, // number of bytes |
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[709] | 230 | unsigned int extend ); // physical addressing |
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[258] | 231 | |
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[587] | 232 | extern int _fat_write( unsigned int fd_id, // file descriptor |
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[709] | 233 | unsigned int vaddr, // source buffer |
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| 234 | unsigned int count, // number of bytes |
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| 235 | unsigned int extend ); // physical addressing |
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[258] | 236 | |
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[587] | 237 | extern int _fat_lseek( unsigned int fd_id, // file descriptor |
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| 238 | unsigned int offset, // new offset value |
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| 239 | unsigned int whence ); // command type |
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[260] | 240 | |
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[587] | 241 | extern int _fat_remove( char* pathname, // path from root |
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| 242 | unsigned int should_be_dir ); // for checking |
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[258] | 243 | |
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[587] | 244 | extern int _fat_rename( char* old_path, // path from root |
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| 245 | char* new_path ); // path from root |
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[258] | 246 | |
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[587] | 247 | extern int _fat_mkdir( char* pathname ); // path from root |
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[258] | 248 | |
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[658] | 249 | extern int _fat_opendir( char* pathname ); // path from root |
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| 250 | |
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| 251 | extern int _fat_closedir( unsigned int fd_id ); // file descriptor |
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| 252 | |
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| 253 | extern int _fat_readdir( unsigned int fd_id, // file descriptor |
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| 254 | fat_dirent_t* entry ); // directory entry |
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| 255 | |
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[587] | 256 | extern int _fat_load_no_cache( char* pathname, // path from root |
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| 257 | unsigned int buffer_vbase, // buffer base |
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| 258 | unsigned int buffer_size ); // buffer size |
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| 259 | |
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[530] | 260 | /*******************************************************************************/ |
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[258] | 261 | |
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| 262 | |
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| 263 | #endif |
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| 264 | |
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| 265 | |
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| 266 | // Local Variables: |
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| 267 | // tab-width: 4 |
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| 268 | // c-basic-offset: 4 |
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| 269 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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| 270 | // indent-tabs-mode: nil |
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| 271 | // End: |
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| 272 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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| 273 | |
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