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incubator-nuttx/fs/fat/fs_fat32.h

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/****************************************************************************
* fs/fat/fs_fat32.h
*
* Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __FS_FAT_FS_FAT32_H
#define __FS_FAT_FS_FAT32_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <time.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/dirent.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* These offsets describes the master boot record.
*
* The folowing fields are common to FAT12/16/32 (but all value descriptions
* refer to the interpretation under FAT32.
*/
#define BS_JUMP 0 /* 3@0: Jump instruction to boot code (ignored) */
#define BS_OEMNAME 3 /* 8@3: Usually "MSWIN4.1" */
#define BS_BYTESPERSEC 11 /* 2@11: Bytes per sector: 512, 1024, 2048, 4096 */
#define BS_SECPERCLUS 13 /* 1@13: Sectors per allocation unit: 2**n, n=0..7 */
#define BS_RESVDSECCOUNT 14 /* 2@14: Reserved sector count: Usually 32 */
#define BS_NUMFATS 16 /* 1@16: Number of FAT data structures: always 2 */
#define BS_ROOTENTCNT 17 /* 2@17: FAT12/16: Must be 0 for FAT32 */
#define BS_TOTSEC16 19 /* 2@19: FAT12/16: Must be 0, see BS_TOTSEC32 */
#define BS_MEDIA 21 /* 1@21: Media code: f0, f8, f9-fa, fc-ff */
#define BS_FATSZ16 22 /* 2@22: FAT12/16: Must be 0, see BS_FATSZ32 */
#define BS_SECPERTRK 24 /* 2@24: Sectors per track geometry value */
#define BS_NUMHEADS 26 /* 2@26: Number of heads geometry value */
#define BS_HIDSEC 28 /* 4@28: Count of hidden sectors preceding FAT */
#define BS_TOTSEC32 32 /* 4@32: Total count of sectors on the volume */
/* The following fields are only valid for FAT12/16 */
#define BS16_DRVNUM 36 /* 1@36: Drive number for MSDOS bootstrap */
/* 1@37: Reserved (zero) */
#define BS16_BOOTSIG 38 /* 1@38: Extended boot signature: 0x29 if following valid */
#define BS16_VOLID 39 /* 4@39: Volume serial number */
#define BS16_VOLLAB 43 /* 11@43: Volume label */
#define BS16_FILESYSTYPE 54 /* 8@54: "FAT12 ", "FAT16 ", or "FAT " */
#define BS16_BOOTCODE 62 /* Boot code may be placed in the remainder of the sector */
#define BS16_BOOTCODESIZE 448
/* The following fields are only valid for FAT32 */
#define BS32_FATSZ32 36 /* 4@36: Count of sectors occupied by one FAT */
#define BS32_EXTFLAGS 40 /* 2@40: 0-3:Active FAT, 7=0 both FATS, 7=1 one FAT */
#define BS32_FSVER 42 /* 2@42: MSB:Major LSB:Minor revision number (0.0) */
#define BS32_ROOTCLUS 44 /* 4@44: Cluster no. of 1st cluster of root dir */
#define BS32_FSINFO 48 /* 2@48: Sector number of fsinfo structure. Usually 1. */
#define BS32_BKBOOTSEC 50 /* 2@50: Sector number of boot record. Usually 6 */
/* 12@52: Reserved (zero) */
#define BS32_DRVNUM 64 /* 1@64: Drive number for MSDOS bootstrap */
/* 1@65: Reserved (zero) */
#define BS32_BOOTSIG 66 /* 1@66: Extended boot signature: 0x29 if following valid */
#define BS32_VOLID 67 /* 4@67: Volume serial number */
#define BS32_VOLLAB 71 /* 11@71: Volume label */
#define BS32_FILESYSTYPE 82 /* 8@82: "FAT12 ", "FAT16 ", or "FAT " */
#define BS32_BOOTCODE 90 /* Boot code may be placed in the remainder of the sector */
#define BS32_BOOTCODESIZE 420
/* If the sector is not an MBR, then it could have a partition table at
* this offset.
*/
#define MBR_TABLE 446
/* The magic bytes at the end of the MBR are common to FAT12/16/32 */
#define BS_SIGNATURE 510 /* 2@510: Valid MBRs have 0x55aa here */
#define BOOT_SIGNATURE16 0xaa55
#define BOOT_SIGNATURE32 0xaa550000
/* The extended boot signature (BS16/32_BOOTSIG) */
#define EXTBOOT_SIGNATURE 0x29
/****************************************************************************
* These offsets describes the partition table.
*/
/* 446@0: Generally unused and zero; but may
* include IDM Boot Manager menu entry at 8@394 */
#define PART_ENTRY(n) (446+((n) << 4)) /* n = 0,1,2,3 */
#define PART_ENTRY1 446 /* 16@446: Partition table, first entry */
#define PART_ENTRY2 462 /* 16@462: Partition table, second entry */
#define PART_ENTRY3 478 /* 16@478: Partition table, third entry */
#define PART_ENTRY4 494 /* 16@494: Partition table, fourth entry */
#define PART_SIGNATURE 510 /* 2@510: Valid partitions have 0x55aa here */
/****************************************************************************
* These offsets describes one partition table entry. NOTE that ent entries
* are aligned to 16-bit offsets so that the STARTSECTOR and SIZE values are
* not properly aligned.
*/
#define PART_BOOTINDICATOR 0 /* 1@0: Boot indicator (0x80: active;0x00:otherwise) */
#define PART_STARTCHS 1 /* 3@1: Starting Cylinder/Head/Sector values */
#define PART_TYPE 4 /* 1@4: Partition type description */
#define PART_ENDCHS 5 /* 3@5: Ending Cylinder/Head/Sector values */
#define PART_STARTSECTOR 8 /* 4@8: Starting sector */
#define PART_SIZE 12 /* 4@12: Partition size (in sectors) */
/****************************************************************************
* Partition table types.
*/
#define PART_TYPE_NONE 0 /* No partition */
#define PART_TYPE_FAT12 1 /* FAT12 */
#define PART_TYPE_FAT16A 4 /* FAT16 (Partition smaller than 32MB) */
#define PART_TYPE_EXT 5 /* Extended MS-DOS Partition */
#define PART_TYPE_FAT16B 6 /* FAT16 (Partition larger than 32MB) */
#define PART_TYPE_FAT32 11 /* FAT32 (Partition up to 2048Gb) */
#define PART_TYPE_FAT32X 12 /* Same as 11, but uses LBA1 0x13 extensions */
#define PART_TYPE_FAT16X 14 /* Same as 6, but uses LBA1 0x13 extensions */
#define PART_TYPE_EXTX 15 /* Same as 5, but uses LBA1 0x13 extensions */
/****************************************************************************
* Each FAT "short" 8.3 file name directory entry is 32-bytes long.
*
* Sizes and limits
*/
/****************************************************************************
* Each FAT "short" 8.3 file name directory entry is 32-bytes long.
*
* Sizes and limits
*/
#define DIR_MAXFNAME 11 /* Max short name size is 8+3 = 11 */
/* The following define offsets relative to the beginning of a directory
* entry.
*/
#define DIR_NAME 0 /* 11@ 0: NAME: 8 bytes + 3 byte extension */
#define DIR_ATTRIBUTES 11 /* 1@11: File attibutes (see below) */
#define DIR_NTRES 12 /* 1@12: Reserved for use by NT */
#define DIR_CRTTIMETENTH 13 /* 1@13: Tenth sec creation timestamp */
#define DIR_CRTIME 14 /* 2@14: Time file created */
#define DIR_CRDATE 16 /* 2@16: Date file created */
#define DIR_LASTACCDATE 18 /* 2@19: Last access date */
#define DIR_FSTCLUSTHI 20 /* 2@20: MS first cluster number */
#define DIR_WRTTIME 22 /* 2@22: Time of last write */
#define DIR_WRTDATE 24 /* 2@24: Date of last write */
#define DIR_FSTCLUSTLO 26 /* 2@26: LS first cluster number */
#define DIR_FILESIZE 28 /* 4@28: File size in bytes */
#define DIR_SIZE 32 /* The size of one directory entry */
#define DIR_SHIFT 5 /* log2 of DIR_SIZE */
/* First byte of the directory name has special meanings: */
#define DIR0_EMPTY 0xe5 /* The directory entry is empty */
#define DIR0_ALLEMPTY 0x00 /* This entry and all following are empty */
#define DIR0_E5 0x05 /* The actual value is 0xe5 */
/* NTRES flags in the FAT directory */
#define FATNTRES_LCNAME 0x08 /* Lower case in name */
#define FATNTRES_LCEXT 0x10 /* Lower case in extension */
/* Directory indexing helper. Each directory entry is 32-bytes in length.
* The number of directory entries in a sector then varies with the size
* of the sector supported in hardware.
*/
#define DIRSEC_NDXMASK(f) (((f)->fs_hwsectorsize - 1) >> 5)
#define DIRSEC_NDIRS(f) (((f)->fs_hwsectorsize) >> 5)
#define DIRSEC_BYTENDX(f,i) (((i) & DIRSEC_NDXMASK(fs)) << 5)
#define SEC_NDXMASK(f) ((f)->fs_hwsectorsize - 1)
#define SEC_NSECTORS(f,n) ((n) / (f)->fs_hwsectorsize)
#define CLUS_NDXMASK(f) ((f)->fs_fatsecperclus - 1)
/****************************************************************************
* The FAT "long" file name (LFN) directory entry */
#ifdef CONFIG_FAT_LFN
/* Sizes and limits */
# ifndef CONFIG_FAT_MAXFNAME /* The maximum support filename can be limited */
# define LDIR_MAXFNAME 255 /* Max unicode characters in file name */
# elif CONFIG_FAT_MAXFNAME <= 255
# define LDIR_MAXFNAME CONFIG_FAT_MAXFNAME
# else
# error "Illegal value for CONFIG_FAT_MAXFNAME"
# endif
# define LDIR_MAXLFNCHARS 13 /* Max unicode characters in one LFN entry */
# define LDIR_MAXLFNS 20 /* Max number of LFN entries */
/* LFN directory entry offsets */
# define LDIR_SEQ 0 /* 1@ 0: Sequence number */
# define LDIR_WCHAR1_5 1 /* 10@ 1: File name characters 1-5 (5 Unicode characters) */
# define LDIR_ATTRIBUTES 11 /* 1@11: File attributes (always 0x0f) */
# define LDIR_NTRES 12 /* 1@12: Reserved for use by NT (always 0x00) */
# define LDIR_CHECKSUM 13 /* 1@13: Checksum of the DOS filename */
# define LDIR_WCHAR6_11 14 /* 12@14: File name characters 6-11 (6 Unicode characters) */
# define LDIR_FSTCLUSTLO 26 /* 2@26: First cluster (always 0x0000) */
# define LDIR_WCHAR12_13 28 /* 4@28: File name characters 12-13 (2 Unicode characters) */
/* LFN sequence number and allocation status */
# define LDIR0_EMPTY DIR0_EMPTY /* The directory entry is empty */
# define LDIR0_ALLEMPTY DIR0_ALLEMPTY /* This entry and all following are empty */
# define LDIR0_E5 DIR0_E5 /* The actual value is 0xe5 */
# define LDIR0_LAST 0x40 /* Last LFN in file name (appears first) */
# define LDIR0_SEQ_MASK 0x1f /* Mask for sequence number (1-20) */
/* The LFN entry attribute */
# define LDDIR_LFNATTR 0x0f
#endif
/****************************************************************************
* File system types */
#define FSTYPE_FAT12 0
#define FSTYPE_FAT16 1
#define FSTYPE_FAT32 2
/* File buffer flags (ff_bflags) */
#define FFBUFF_VALID 1
#define FFBUFF_DIRTY 2
#define FFBUFF_MODIFIED 4
/* Mount status flags (ff_bflags) */
#define UMOUNT_FORCED 8
/****************************************************************************
* These offset describe the FSINFO sector
*/
#define FSI_LEADSIG 0 /* 4@0: 0x41615252 = "RRaA" */
/* 480@4: Reserved (zero) */
#define FSI_STRUCTSIG 484 /* 4@484: 0x61417272 = "rrAa" */
#define FSI_FREECOUNT 488 /* 4@488: Last free cluster count on volume */
#define FSI_NXTFREE 492 /* 4@492: Cluster number of 1st free cluster */
/* 12@496: Reserved (zero) */
#define FSI_TRAILSIG 508 /* 4@508: 0xaa550000 */
/****************************************************************************
* FAT values
*/
#define FAT_EOF 0x0ffffff8
#define FAT_BAD 0x0ffffff7
/****************************************************************************
* Maximum cluster by FAT type. This is the key value used to distinquish
* between FAT12, 16, and 32.
*/
/* FAT12: For M$, the calculation is ((1 << 12) - 19). But we will follow the
* Linux tradition of allowing slightly more clusters for FAT12.
*/
#define FAT_MAXCLUST12 ((1 << 12) - 16)
/* FAT16: For M$, the calculation is ((1 << 16) - 19). (The uint32_t cast is
* needed for architectures where int is only 16 bits).
*/
#define FAT_MINCLUST16 (FAT_MAXCLUST12 + 1)
#define FAT_MAXCLUST16 (((uint32_t)1 << 16) - 16)
/* FAT32: M$ reserves the MS 4 bits of a FAT32 FAT entry so only 18 bits are
* available. For M$, the calculation is ((1 << 28) - 19). (The uint32_t cast
* is needed for architectures where int is only 16 bits). M$ also claims
* that the minimum size is 65,527.
*/
#define FAT_MINCLUST32 65524
/* #define FAT_MINCLUST32 (FAT_MAXCLUST16 + 1) */
#define FAT_MAXCLUST32 (((uint32_t)1 << 28) - 16)
/****************************************************************************
* Access to data in raw sector data */
#define UBYTE_VAL(p,o) (((uint8_t*)(p))[o])
#define UBYTE_PTR(p,o) &UBYTE_VAL(p,o)
#define UBYTE_PUT(p,o,v) (UBYTE_VAL(p,o)=(uint8_t)(v))
#define UINT16_PTR(p,o) ((uint16_t*)UBYTE_PTR(p,o))
#define UINT16_VAL(p,o) (*UINT16_PTR(p,o))
#define UINT16_PUT(p,o,v) (UINT16_VAL(p,o)=(uint16_t)(v))
#define UINT32_PTR(p,o) ((uint32_t*)UBYTE_PTR(p,o))
#define UINT32_VAL(p,o) (*UINT32_PTR(p,o))
#define UINT32_PUT(p,o,v) (UINT32_VAL(p,o)=(uint32_t)(v))
/* Regardless of the endian-ness of the target or alignment of the data, no
* special operations are required for byte, string or byte array accesses.
* The FAT data stream is little endian so multiple byte values must be
* accessed byte-by-byte for big-endian targets.
*/
#define MBR_GETSECPERCLUS(p) UBYTE_VAL(p,BS_SECPERCLUS)
#define MBR_GETNUMFATS(p) UBYTE_VAL(p,BS_NUMFATS)
#define MBR_GETMEDIA(p) UBYTE_VAL(p,BS_MEDIA)
#define MBR_GETDRVNUM16(p) UBYTE_VAL(p,BS16_DRVNUM)
#define MBR_GETDRVNUM32(p) UBYTE_VAL(p,BS32_DRVNUM)
#define MBR_GETBOOTSIG16(p) UBYTE_VAL(p,BS16_BOOTSIG)
#define MBR_GETBOOTSIG32(p) UBYTE_VAL(p,BS32_BOOTSIG)
#define PART_GETTYPE(n,p) UBYTE_VAL(p,PART_ENTRY(n)+PART_TYPE)
#define PART1_GETTYPE(p) UBYTE_VAL(p,PART_ENTRY1+PART_TYPE)
#define PART2_GETTYPE(p) UBYTE_VAL(p,PART_ENTRY2+PART_TYPE)
#define PART3_GETTYPE(p) UBYTE_VAL(p,PART_ENTRY3+PART_TYPE)
#define PART4_GETTYPE(p) UBYTE_VAL(p,PART_ENTRY4+PART_TYPE)
#define DIR_GETATTRIBUTES(p) UBYTE_VAL(p,DIR_ATTRIBUTES)
#define DIR_GETNTRES(p) UBYTE_VAL(p,DIR_NTRES)
#define DIR_GETCRTTIMETENTH(p) UBYTE_VAL(p,DIR_CRTTIMETENTH)
#ifdef CONFIG_FAT_LFN
# define LDIR_GETSEQ(p) UBYTE_VAL(p,LDIR_SEQ)
# define LDIR_GETATTRIBUTES(p) UBYTE_VAL(p,LDIR_ATTRIBUTES)
# define LDIR_GETNTRES(p) UBYTE_VAL(p,LDIR_NTRES)
# define LDIR_GETCHECKSUM(p) UBYTE_VAL(p,LDIR_CHECKSUM)
#endif
#define MBR_PUTSECPERCLUS(p,v) UBYTE_PUT(p,BS_SECPERCLUS,v)
#define MBR_PUTNUMFATS(p,v) UBYTE_PUT(p,BS_NUMFATS,v)
#define MBR_PUTMEDIA(p,v) UBYTE_PUT(p,BS_MEDIA,v)
#define MBR_PUTDRVNUM16(p,v) UBYTE_PUT(p,BS16_DRVNUM,v)
#define MBR_PUTDRVNUM32(p,v) UBYTE_PUT(p,BS32_DRVNUM,v)
#define MBR_PUTBOOTSIG16(p,v) UBYTE_PUT(p,BS16_BOOTSIG,v)
#define MBR_PUTBOOTSIG32(p,v) UBYTE_PUT(p,BS32_BOOTSIG,v)
#define PART_PUTTYPE(n,p,v) UBYTE_PUT(p,PART_ENTRY(n)+PART_TYPE,v)
#define PART1_PUTTYPE(p,v) UBYTE_PUT(p,PART_ENTRY1+PART_TYPE,v)
#define PART2_PUTTYPE(p,v) UBYTE_PUT(p,PART_ENTRY2+PART_TYPE,v)
#define PART3_PUTTYPE(p,v) UBYTE_PUT(p,PART_ENTRY3+PART_TYPE,v)
#define PART4_PUTTYPE(p,v) UBYTE_PUT(p,PART_ENTRY4+PART_TYPE,v)
#define DIR_PUTATTRIBUTES(p,v) UBYTE_PUT(p,DIR_ATTRIBUTES,v)
#define DIR_PUTNTRES(p,v) UBYTE_PUT(p,DIR_NTRES,v)
#define DIR_PUTCRTTIMETENTH(p,v) UBYTE_PUT(p,DIR_CRTTIMETENTH,v)
#ifdef CONFIG_FAT_LFN
# define LDIR_PUTSEQ(p,v) UBYTE_PUT(p,LDIR_SEQ,v)
# define LDIR_PUTATTRIBUTES(p,v) UBYTE_PUT(p,LDIR_ATTRIBUTES,v)
# define LDIR_PUTNTRES(p,v) UBYTE_PUT(p,LDIR_NTRES,v)
# define LDIR_PUTCHECKSUM(p,v) UBYTE_PUT(p,LDIR_CHECKSUM,v)
#endif
/* For the all targets, unaligned values need to be accessed byte-by-byte.
* Some architectures may handle unaligned accesses with special interrupt
* handlers. But even in that case, it is more efficient to avoid the traps.
*/
/* Unaligned multi-byte access macros */
#define MBR_GETBYTESPERSEC(p) fat_getuint16(UBYTE_PTR(p,BS_BYTESPERSEC))
#define MBR_GETROOTENTCNT(p) fat_getuint16(UBYTE_PTR(p,BS_ROOTENTCNT))
#define MBR_GETTOTSEC16(p) fat_getuint16(UBYTE_PTR(p,BS_TOTSEC16))
#define MBR_GETVOLID16(p) fat_getuint32(UBYTE_PTR(p,BS16_VOLID))
#define MBR_GETVOLID32(p) fat_getuint32(UBYTE_PTR(p,BS32_VOLID))
#define PART_GETSTARTSECTOR(n,p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY(n)+PART_STARTSECTOR))
#define PART_GETSIZE(n,p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY(n)+PART_SIZE))
#define PART1_GETSTARTSECTOR(p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY1+PART_STARTSECTOR))
#define PART1_GETSIZE(p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY1+PART_SIZE))
#define PART2_GETSTARTSECTOR(p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY2+PART_STARTSECTOR))
#define PART2_GETSIZE(p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY2+PART_SIZE))
#define PART3_GETSTARTSECTOR(p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY3+PART_STARTSECTOR))
#define PART3_GETSIZE(p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY3+PART_SIZE))
#define PART4_GETSTARTSECTOR(p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY4+PART_STARTSECTOR))
#define PART4_GETSIZE(p) fat_getuint32(UBYTE_PTR(p,PART_ENTRY4+PART_SIZE))
#define MBR_PUTBYTESPERSEC(p,v) fat_putuint16(UBYTE_PTR(p,BS_BYTESPERSEC),v)
#define MBR_PUTROOTENTCNT(p,v) fat_putuint16(UBYTE_PTR(p,BS_ROOTENTCNT),v)
#define MBR_PUTTOTSEC16(p,v) fat_putuint16(UBYTE_PTR(p,BS_TOTSEC16),v)
#define MBR_PUTVOLID16(p,v) fat_putuint32(UBYTE_PTR(p,BS16_VOLID),v)
#define MBR_PUTVOLID32(p,v) fat_putuint32(UBYTE_PTR(p,BS32_VOLID),v)
#define PART_PUTSTARTSECTOR(n,p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY(n)+PART_STARTSECTOR),v)
#define PART_PUTSIZE(n,p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY(n)+PART_SIZE),v)
#define PART1_PUTSTARTSECTOR(p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY1+PART_STARTSECTOR),v)
#define PART1_PUTSIZE(p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY1+PART_SIZE),v)
#define PART2_PUTSTARTSECTOR(p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY2+PART_STARTSECTOR),v)
#define PART2_PUTSIZE(p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY2+PART_SIZE),v)
#define PART3_PUTSTARTSECTOR(p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY3+PART_STARTSECTOR),v)
#define PART3_PUTSIZE(p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY3+PART_SIZE),v)
#define PART4_PUTSTARTSECTOR(p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY4+PART_STARTSECTOR),v)
#define PART4_PUTSIZE(p,v) fat_putuint32(UBYTE_PTR(p,PART_ENTRY4+PART_SIZE),v)
#ifdef CONFIG_FAT_LFN
# define LDIR_PTRWCHAR1_5(p) UBYTE_PTR(p,LDIR_WCHAR1_5)
# define LDIR_PTRWCHAR6_11(p) UBYTE_PTR(p,LDIR_WCHAR6_11)
# define LDIR_PTRWCHAR12_13(p) UBYTE_PTR(p,LDIR_WCHAR12_13)
#endif
/* But for multi-byte values, the endian-ness of the target vs. the little
* endian order of the byte stream or alignment of the data within the byte
* stream can force special, byte-by-byte accesses.
*/
#ifdef CONFIG_ENDIAN_BIG
/* If the target is big-endian, then even aligned multi-byte values must be
* accessed byte-by-byte.
*/
# define MBR_GETRESVDSECCOUNT(p) fat_getuint16(UBYTE_PTR(p,BS_RESVDSECCOUNT))
# define MBR_GETFATSZ16(p) fat_getuint16(UBYTE_PTR(p,BS_FATSZ16))
# define MBR_GETSECPERTRK(p) fat_getuint16(UBYTE_PTR(p,BS_SECPERTRK))
# define MBR_GETNUMHEADS(p) fat_getuint16(UBYTE_PTR(p,BS_NUMHEADS))
# define MBR_GETHIDSEC(p) fat_getuint32(UBYTE_PTR(p,BS_HIDSEC))
# define MBR_GETTOTSEC32(p) fat_getuint32(UBYTE_PTR(p,BS_TOTSEC32))
# define MBR_GETFATSZ32(p) fat_getuint32(UBYTE_PTR(p,BS32_FATSZ32))
# define MBR_GETEXTFLAGS(p) fat_getuint16(UBYTE_PTR(p,BS32_EXTFLAGS))
# define MBR_GETFSVER(p) fat_getuint16(UBYTE_PTR(p,BS32_FSVER))
# define MBR_GETROOTCLUS(p) fat_getuint32(UBYTE_PTR(p,BS32_ROOTCLUS))
# define MBR_GETFSINFO(p) fat_getuint16(UBYTE_PTR(p,BS32_FSINFO))
# define MBR_GETBKBOOTSEC(p) fat_getuint16(UBYTE_PTR(p,BS32_BKBOOTSEC))
# define MBR_GETSIGNATURE(p) fat_getuint16(UBYTE_PTR(p,BS_SIGNATURE))
# define FSI_GETLEADSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_LEADSIG))
# define FSI_GETSTRUCTSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_STRUCTSIG))
# define FSI_GETFREECOUNT(p) fat_getuint32(UBYTE_PTR(p,FSI_FREECOUNT))
# define FSI_GETNXTFREE(p) fat_getuint32(UBYTE_PTR(p,FSI_NXTFREE))
# define FSI_GETTRAILSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_TRAILSIG))
# define DIR_GETCRTIME(p) fat_getuint16(UBYTE_PTR(p,DIR_CRTIME))
# define DIR_GETCRDATE(p) fat_getuint16(UBYTE_PTR(p,DIR_CRDATE))
# define DIR_GETLASTACCDATE(p) fat_getuint16(UBYTE_PTR(p,DIR_LASTACCDATE))
# define DIR_GETFSTCLUSTHI(p) fat_getuint16(UBYTE_PTR(p,DIR_FSTCLUSTHI))
# define DIR_GETWRTTIME(p) fat_getuint16(UBYTE_PTR(p,DIR_WRTTIME))
# define DIR_GETWRTDATE(p) fat_getuint16(UBYTE_PTR(p,DIR_WRTDATE))
# define DIR_GETFSTCLUSTLO(p) fat_getuint16(UBYTE_PTR(p,DIR_FSTCLUSTLO))
# define DIR_GETFILESIZE(p) fat_getuint32(UBYTE_PTR(p,DIR_FILESIZE))
# ifdef CONFIG_FAT_LFN
# define LDIR_GETWCHAR1(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR1_5))
# define LDIR_GETWCHAR2(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR1_5+2))
# define LDIR_GETWCHAR3(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR1_5+4))
# define LDIR_GETWCHAR4(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR1_5+6))
# define LDIR_GETWCHAR5(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR1_5+8))
# define LDIR_GETWCHAR6(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR6_11))
# define LDIR_GETWCHAR7(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+2))
# define LDIR_GETWCHAR8(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+4))
# define LDIR_GETWCHAR9(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+6))
# define LDIR_GETWCHAR10(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+8))
# define LDIR_GETWCHAR11(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+10))
# define LDIR_GETWCHAR12(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR12_13))
# define LDIR_GETWCHAR13(p) fat_getuint16(UBYTE_PTR(p,LDIR_WCHAR12_13+2))
# define LDIR_GETFSTCLUSTLO(p) fat_getuint16(UBYTE_PTR(p,LDIR_FSTCLUSTLO))
# endif
# define FSI_GETLEADSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_LEADSIG))
# define FSI_GETSTRUCTSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_STRUCTSIG))
# define FSI_GETFREECOUNT(p) fat_getuint32(UBYTE_PTR(p,FSI_FREECOUNT))
# define FSI_GETNXTFREE(p) fat_getuint32(UBYTE_PTR(p,FSI_NXTFREE))
# define FSI_GETTRAILSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_TRAILSIG))
# define FAT_GETFAT16(p,i) fat_getuint16(UBYTE_PTR(p,i))
# define FAT_GETFAT32(p,i) fat_getuint32(UBYTE_PTR(p,i))
# define MBR_PUTRESVDSECCOUNT(p,v) fat_putuint16(UBYTE_PTR(p,BS_RESVDSECCOUNT),v)
# define MBR_PUTFATSZ16(p,v) fat_putuint16(UBYTE_PTR(p,BS_FATSZ16),v)
# define MBR_PUTSECPERTRK(p,v) fat_putuint16(UBYTE_PTR(p,BS_SECPERTRK),v)
# define MBR_PUTNUMHEADS(p,v) fat_putuint16(UBYTE_PTR(p,BS_NUMHEADS),v)
# define MBR_PUTHIDSEC(p,v) fat_putuint32(UBYTE_PTR(p,BS_HIDSEC),v)
# define MBR_PUTTOTSEC32(p,v) fat_putuint32(UBYTE_PTR(p,BS_TOTSEC32),v)
# define MBR_PUTFATSZ32(p,v) fat_putuint32(UBYTE_PTR(p,BS32_FATSZ32),v)
# define MBR_PUTEXTFLAGS(p,v) fat_putuint16(UBYTE_PTR(p,BS32_EXTFLAGS),v)
# define MBR_PUTFSVER(p,v) fat_putuint16(UBYTE_PTR(p,BS32_FSVER),v)
# define MBR_PUTROOTCLUS(p,v) fat_putuint32(UBYTE_PTR(p,BS32_ROOTCLUS),v)
# define MBR_PUTFSINFO(p,v) fat_putuint16(UBYTE_PTR(p,BS32_FSINFO),v)
# define MBR_PUTBKBOOTSEC(p,v) fat_putuint16(UBYTE_PTR(p,BS32_BKBOOTSEC),v)
# define MBR_PUTSIGNATURE(p,v) fat_putuint16(UBYTE_PTR(p,BS_SIGNATURE),v)
# define FSI_PUTLEADSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_LEADSIG),v)
# define FSI_PUTSTRUCTSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_STRUCTSIG),v)
# define FSI_PUTFREECOUNT(p,v) fat_putuint32(UBYTE_PTR(p,FSI_FREECOUNT),v)
# define FSI_PUTNXTFREE(p,v) fat_putuint32(UBYTE_PTR(p,FSI_NXTFREE),v)
# define FSI_PUTTRAILSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_TRAILSIG),v)
# define DIR_PUTCRTIME(p,v) fat_putuint16(UBYTE_PTR(p,DIR_CRTIME),v)
# define DIR_PUTCRDATE(p,v) fat_putuint16(UBYTE_PTR(p,DIR_CRDATE),v)
# define DIR_PUTLASTACCDATE(p,v) fat_putuint16(UBYTE_PTR(p,DIR_LASTACCDATE),v)
# define DIR_PUTFSTCLUSTHI(p,v) fat_putuint16(UBYTE_PTR(p,DIR_FSTCLUSTHI),v)
# define DIR_PUTWRTTIME(p,v) fat_putuint16(UBYTE_PTR(p,DIR_WRTTIME),v)
# define DIR_PUTWRTDATE(p,v) fat_putuint16(UBYTE_PTR(p,DIR_WRTDATE),v)
# define DIR_PUTFSTCLUSTLO(p,v) fat_putuint16(UBYTE_PTR(p,DIR_FSTCLUSTLO),v)
# define DIR_PUTFILESIZE(p,v) fat_putuint32(UBYTE_PTR(p,DIR_FILESIZE),v)
# ifdef CONFIG_FAT_LFN
# define LDIR_PUTWCHAR1(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR1_5),v)
# define LDIR_PUTWCHAR2(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR1_5+2),v)
# define LDIR_PUTWCHAR3(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR1_5+4),v)
# define LDIR_PUTWCHAR4(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR1_5+6),v)
# define LDIR_PUTWCHAR5(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR1_5+8),v)
# define LDIR_PUTWCHAR6(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR6_11),v)
# define LDIR_PUTWCHAR7(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+2),v)
# define LDIR_PUTWCHAR8(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+4),v)
# define LDIR_PUTWCHAR9(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+6),v)
# define LDIR_PUTWCHAR10(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+8),v)
# define LDIR_PUTWCHAR11(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR6_11+10),v)
# define LDIR_PUTWCHAR12(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR12_13),v)
# define LDIR_PUTWCHAR13(p) fat_putuint16(UBYTE_PTR(p,LDIR_WCHAR12_13+2),v)
# endif
# define FSI_PUTLEADSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_LEADSIG),v)
# define FSI_PUTSTRUCTSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_STRUCTSIG),v)
# define FSI_PUTFREECOUNT(p,v) fat_putuint32(UBYTE_PTR(p,FSI_FREECOUNT),v)
# define FSI_PUTNXTFREE(p,v) fat_putuint32(UBYTE_PTR(p,FSI_NXTFREE),v)
# define FSI_PUTTRAILSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_TRAILSIG),v)
# define FAT_PUTFAT16(p,i,v) fat_putuint16(UBYTE_PTR(p,i),v)
# define FAT_PUTFAT32(p,i,v) fat_putuint32(UBYTE_PTR(p,i),v)
#else
/* But nothing special has to be done for the little endian-case for access
* to aligned mulitbyte values.
*/
# define MBR_GETRESVDSECCOUNT(p) UINT16_VAL(p,BS_RESVDSECCOUNT)
# define MBR_GETFATSZ16(p) UINT16_VAL(p,BS_FATSZ16)
# define MBR_GETSECPERTRK(p) UINT16_VAL(p,BS_SECPERTRK)
# define MBR_GETNUMHEADS(p) UINT16_VAL(p,BS_NUMHEADS)
# define MBR_GETHIDSEC(p) UINT32_VAL(p,BS_HIDSEC)
# define MBR_GETTOTSEC32(p) UINT32_VAL(p,BS_TOTSEC32)
# define MBR_GETFATSZ32(p) UINT32_VAL(p,BS32_FATSZ32)
# define MBR_GETEXTFLAGS(p) UINT16_VAL(p,BS32_EXTFLAGS)
# define MBR_GETFSVER(p) UINT16_VAL(p,BS32_FSVER)
# define MBR_GETROOTCLUS(p) UINT32_VAL(p,BS32_ROOTCLUS)
# define MBR_GETFSINFO(p) UINT16_VAL(p,BS32_FSINFO)
# define MBR_GETBKBOOTSEC(p) UINT16_VAL(p,BS32_BKBOOTSEC)
# define MBR_GETSIGNATURE(p) UINT16_VAL(p,BS_SIGNATURE)
# define FSI_GETLEADSIG(p) UINT32_VAL(p,FSI_LEADSIG)
# define FSI_GETSTRUCTSIG(p) UINT32_VAL(p,FSI_STRUCTSIG)
# define FSI_GETFREECOUNT(p) UINT32_VAL(p,FSI_FREECOUNT)
# define FSI_GETNXTFREE(p) UINT32_VAL(p,FSI_NXTFREE)
# define FSI_GETTRAILSIG(p) UINT32_VAL(p,FSI_TRAILSIG)
# define DIR_GETCRTIME(p) UINT16_VAL(p,DIR_CRTIME)
# define DIR_GETCRDATE(p) UINT16_VAL(p,DIR_CRDATE)
# define DIR_GETLASTACCDATE(p) UINT16_VAL(p,DIR_LASTACCDATE)
# define DIR_GETFSTCLUSTHI(p) UINT16_VAL(p,DIR_FSTCLUSTHI)
# define DIR_GETWRTTIME(p) UINT16_VAL(p,DIR_WRTTIME)
# define DIR_GETWRTDATE(p) UINT16_VAL(p,DIR_WRTDATE)
# define DIR_GETFSTCLUSTLO(p) UINT16_VAL(p,DIR_FSTCLUSTLO)
# define DIR_GETFILESIZE(p) UINT32_VAL(p,DIR_FILESIZE)
# ifdef CONFIG_FAT_LFN
# define LDIR_GETWCHAR1(p) UINT16_VAL(p,LDIR_WCHAR1_5)
# define LDIR_GETWCHAR2(p) UINT16_VAL(p,LDIR_WCHAR1_5+2)
# define LDIR_GETWCHAR3(p) UINT16_VAL(p,LDIR_WCHAR1_5+4)
# define LDIR_GETWCHAR4(p) UINT16_VAL(p,LDIR_WCHAR1_5+6)
# define LDIR_GETWCHAR5(p) UINT16_VAL(p,LDIR_WCHAR1_5+8)
# define LDIR_GETWCHAR6(p) UINT16_VAL(p,LDIR_WCHAR6_11)
# define LDIR_GETWCHAR7(p) UINT16_VAL(p,LDIR_WCHAR6_11+2)
# define LDIR_GETWCHAR8(p) UINT16_VAL(p,LDIR_WCHAR6_11+4)
# define LDIR_GETWCHAR9(p) UINT16_VAL(p,LDIR_WCHAR6_11+6)
# define LDIR_GETWCHAR10(p) UINT16_VAL(p,LDIR_WCHAR6_11+8)
# define LDIR_GETWCHAR11(p) UINT16_VAL(p,LDIR_WCHAR6_11+10)
# define LDIR_GETWCHAR12(p) UINT16_VAL(p,LDIR_WCHAR12_13)
# define LDIR_GETWCHAR13(p) UINT16_VAL(p,LDIR_WCHAR12_13+2)
# endif
# define FSI_GETLEADSIG(p) UINT32_VAL(p,FSI_LEADSIG)
# define FSI_GETSTRUCTSIG(p) UINT32_VAL(p,FSI_STRUCTSIG)
# define FSI_GETFREECOUNT(p) UINT32_VAL(p,FSI_FREECOUNT)
# define FSI_GETNXTFREE(p) UINT32_VAL(p,FSI_NXTFREE)
# define FSI_GETTRAILSIG(p) UINT32_VAL(p,FSI_TRAILSIG)
# define FAT_GETFAT16(p,i) UINT16_VAL(p,i)
# define FAT_GETFAT32(p,i) UINT32_VAL(p,i)
# define MBR_PUTRESVDSECCOUNT(p,v) UINT16_PUT(p,BS_RESVDSECCOUNT,v)
# define MBR_PUTFATSZ16(p,v) UINT16_PUT(p,BS_FATSZ16,v)
# define MBR_PUTSECPERTRK(p,v) UINT16_PUT(p,BS_SECPERTRK,v)
# define MBR_PUTNUMHEADS(p,v) UINT16_PUT(p,BS_NUMHEADS,v)
# define MBR_PUTHIDSEC(p,v) UINT32_PUT(p,BS_HIDSEC,v)
# define MBR_PUTTOTSEC32(p,v) UINT32_PUT(p,BS_TOTSEC32,v)
# define MBR_PUTFATSZ32(p,v) UINT32_PUT(p,BS32_FATSZ32,v)
# define MBR_PUTEXTFLAGS(p,v) UINT16_PUT(p,BS32_EXTFLAGS,v)
# define MBR_PUTFSVER(p,v) UINT16_PUT(p,BS32_FSVER,v)
# define MBR_PUTROOTCLUS(p,v) UINT32_PUT(p,BS32_ROOTCLUS,v)
# define MBR_PUTFSINFO(p,v) UINT16_PUT(p,BS32_FSINFO,v)
# define MBR_PUTBKBOOTSEC(p,v) UINT16_PUT(p,BS32_BKBOOTSEC,v)
# define MBR_PUTSIGNATURE(p,v) UINT16_PUT(p,BS_SIGNATURE,v)
# define FSI_PUTLEADSIG(p,v) UINT32_PUT(p,FSI_LEADSIG,v)
# define FSI_PUTSTRUCTSIG(p,v) UINT32_PUT(p,FSI_STRUCTSIG,v)
# define FSI_PUTFREECOUNT(p,v) UINT32_PUT(p,FSI_FREECOUNT,v)
# define FSI_PUTNXTFREE(p,v) UINT32_PUT(p,FSI_NXTFREE,v)
# define FSI_PUTTRAILSIG(p,v) UINT32_PUT(p,FSI_TRAILSIG,v)
# define DIR_PUTCRTIME(p,v) UINT16_PUT(p,DIR_CRTIME,v)
# define DIR_PUTCRDATE(p,v) UINT16_PUT(p,DIR_CRDATE,v)
# define DIR_PUTLASTACCDATE(p,v) UINT16_PUT(p,DIR_LASTACCDATE,v)
# define DIR_PUTFSTCLUSTHI(p,v) UINT16_PUT(p,DIR_FSTCLUSTHI,v)
# define DIR_PUTWRTTIME(p,v) UINT16_PUT(p,DIR_WRTTIME,v)
# define DIR_PUTWRTDATE(p,v) UINT16_PUT(p,DIR_WRTDATE,v)
# define DIR_PUTFSTCLUSTLO(p,v) UINT16_PUT(p,DIR_FSTCLUSTLO,v)
# define DIR_PUTFILESIZE(p,v) UINT32_PUT(p,DIR_FILESIZE,v)
# ifdef CONFIG_FAT_LFN
# define LDIR_PUTWCHAR1(p,v) UINT16_PUT(p,LDIR_WCHAR1_5,v)
# define LDIR_PUTWCHAR2(p,v) UINT16_PUT(p,LDIR_WCHAR1_5+2,v)
# define LDIR_PUTWCHAR3(p,v) UINT16_PUT(p,LDIR_WCHAR1_5+4,v)
# define LDIR_PUTWCHAR4(p,v) UINT16_PUT(p,LDIR_WCHAR1_5+6,v)
# define LDIR_PUTWCHAR5(p,v) UINT16_PUT(p,LDIR_WCHAR1_5+8,v)
# define LDIR_PUTWCHAR6(p,v) UINT16_PUT(p,LDIR_WCHAR6_11,v)
# define LDIR_PUTWCHAR7(p,v) UINT16_PUT(p,LDIR_WCHAR6_11+2,v)
# define LDIR_PUTWCHAR8(p,v) UINT16_PUT(p,LDIR_WCHAR6_11+4,v)
# define LDIR_PUTWCHAR9(p,v) UINT16_PUT(p,LDIR_WCHAR6_11+6,v)
# define LDIR_PUTWCHAR10(p,v) UINT16_PUT(p,LDIR_WCHAR6_11+8,v)
# define LDIR_PUTWCHAR11(p,v) UINT16_PUT(p,LDIR_WCHAR6_11+10,v)
# define LDIR_PUTWCHAR12(p,v) UINT16_PUT(p,LDIR_WCHAR12_13,v)
# define LDIR_PUTWCHAR13(p,v) UINT16_PUT(p,LDIR_WCHAR12_13+2,v)
# endif
# define FSI_PUTLEADSIG(p,v) UINT32_PUT(p,FSI_LEADSIG,v)
# define FSI_PUTSTRUCTSIG(p,v) UINT32_PUT(p,FSI_STRUCTSIG,v)
# define FSI_PUTFREECOUNT(p,v) UINT32_PUT(p,FSI_FREECOUNT,v)
# define FSI_PUTNXTFREE(p,v) UINT32_PUT(p,FSI_NXTFREE,v)
# define FSI_PUTTRAILSIG(p,v) UINT32_PUT(p,FSI_TRAILSIG,v)
# define FAT_PUTFAT16(p,i,v) UINT16_PUT(p,i,v)
# define FAT_PUTFAT32(p,i,v) UINT32_PUT(p,i,v)
#endif
/****************************************************************************
* Name: fat_io_alloc and fat_io_free
*
* Description:
* The FAT file system allocates two I/O buffers for data transfer, each
* are the size of one device sector. One of the buffers is allocated
* once for each FAT volume that is mounted; the other buffers are
* allocated each time a FAT file is opened.
*
* Some hardware, however, may require special DMA-capable memory in
* order to perform the transfers. If CONFIG_FAT_DMAMEMORY is defined
* then the architecture-specific hardware must provide the funtions
* fat_dma_alloc() and fat_dma_free() as prototyped below: fat_dmalloc()
* will allocate DMA-capable memory of the specified size; fat_dmafree()
* is the corresponding function that will be called to free the DMA-
* capable memory.
*
****************************************************************************/
#ifdef CONFIG_FAT_DMAMEMORY
# define fat_io_alloc(s) fat_dma_alloc(s)
# define fat_io_free(m,s) fat_dma_free(m,s)
#else
# define fat_io_alloc(s) kmm_malloc(s)
# define fat_io_free(m,s) kmm_free(m)
#endif
/****************************************************************************
* Public Types
****************************************************************************/
/* This structure represents the overall mountpoint state. An instance of this
* structure is retained as inode private data on each mountpoint that is
* mounted with a fat32 filesystem.
*/
struct fat_file_s;
struct fat_mountpt_s
{
struct inode *fs_blkdriver; /* The block driver inode that hosts the FAT32 fs */
struct fat_file_s *fs_head; /* A list to all files opened on this mountpoint */
sem_t fs_sem; /* Used to assume thread-safe access */
off_t fs_hwsectorsize; /* HW: Sector size reported by block driver*/
off_t fs_hwnsectors; /* HW: The number of sectors reported by the hardware */
off_t fs_fatbase; /* Logical block of start of filesystem (past resd sectors) */
off_t fs_rootbase; /* MBR: Cluster no. of 1st cluster of root dir */
off_t fs_database; /* Logical block of start data sectors */
off_t fs_fsinfo; /* MBR: Sector number of FSINFO sector */
off_t fs_currentsector; /* The sector number buffered in fs_buffer */
uint32_t fs_nclusters; /* Maximum number of data clusters */
uint32_t fs_nfatsects; /* MBR: Count of sectors occupied by one fat */
uint32_t fs_fattotsec; /* MBR: Total count of sectors on the volume */
uint32_t fs_fsifreecount; /* FSI: Last free cluster count on volume */
uint32_t fs_fsinextfree; /* FSI: Cluster number of 1st free cluster */
uint16_t fs_fatresvdseccount; /* MBR: The total number of reserved sectors */
uint16_t fs_rootentcnt; /* MBR: Count of 32-bit root directory entries */
bool fs_mounted; /* true: The file system is ready */
bool fs_dirty; /* true: fs_buffer is dirty */
bool fs_fsidirty; /* true: FSINFO sector must be written to disk */
uint8_t fs_type; /* FSTYPE_FAT12, FSTYPE_FAT16, or FSTYPE_FAT32 */
uint8_t fs_fatnumfats; /* MBR: Number of FATs (probably 2) */
uint8_t fs_fatsecperclus; /* MBR: Sectors per allocation unit: 2**n, n=0..7 */
uint8_t *fs_buffer; /* This is an allocated buffer to hold one sector
* from the device */
};
/* This structure represents on open file under the mountpoint. An instance
* of this structure is retained as struct file specific information on each
* opened file.
*/
struct fat_file_s
{
struct fat_file_s *ff_next; /* Retained in a singly linked list */
uint8_t ff_bflags; /* The file buffer/mount flags */
uint8_t ff_oflags; /* Flags provided when file was opened */
uint8_t ff_sectorsincluster; /* Sectors remaining in cluster */
uint16_t ff_dirindex; /* Index into ff_dirsector to directory entry */
uint32_t ff_currentcluster; /* Current cluster being accessed */
off_t ff_dirsector; /* Sector containing the directory entry */
off_t ff_size; /* Size of the file in bytes */
off_t ff_startcluster; /* Start cluster of file on media */
off_t ff_currentsector; /* Current sector being operated on */
off_t ff_cachesector; /* Current sector in the file buffer */
uint8_t *ff_buffer; /* File buffer (for partial sector accesses) */
};
/* This structure holds the sequence of directory entries used by one
* file element (directory or file). For short file names, this is
* single diretory entry. But for long file names, the is a sequence
* of directory entries. Long directory name entries appear in reverse
* order: Last, next-to-last, ..., first. The "first" long file name
* directory is then following by the short directory name entry. The
* short file name entry contains the real meat of the file data.
*
* So it takes the sector number and entry offset of the last long
* file name entry and of the short file name entry to define the
* sequence. In the case of short file names, the sector number and
* offset will be the same.
*/
struct fat_dirseq_s
{
/* Sector offsets */
uint16_t ds_offset; /* Sector offset to short file name entry */
#ifdef CONFIG_FAT_LFN
uint16_t ds_lfnoffset; /* Sector offset to last long file name entry */
#endif
/* Sector and cluster numbers */
off_t ds_sector; /* Sector of the short file name entry */
#ifdef CONFIG_FAT_LFN
off_t ds_cluster; /* Cluster containing the short file name entry */
off_t ds_lfnsector; /* Sector of the last long name entry */
off_t ds_lfncluster; /* Cluster containing the long file name entry */
off_t ds_startsector; /* Starting sector of the directory */
#endif
};
/* This structure is used internally for describing directory entries */
struct fat_dirinfo_s
{
/* The file/directory name */
#ifdef CONFIG_FAT_LFN
uint8_t fd_lfname[LDIR_MAXFNAME+1]; /* Long filename with terminator */
#endif
uint8_t fd_name[DIR_MAXFNAME]; /* Short 8.3 alias filename (no terminator) */
/* NT flags are not used */
#ifdef CONFIG_FAT_LCNAMES
uint8_t fd_ntflags; /* NTRes lower case flags */
#endif
/* TRUE if this is the root directory */
bool fd_root;
/* The following provides the sequence of directory entries used by the
* file or directory.
*/
struct fat_dirseq_s fd_seq; /* Directory sequence */
/* This is part of the opendir, readdir, ... logic */
struct fs_fatdir_s dir; /* Used with opendir, readdir, etc. */
};
/* Generic helper macros ****************************************************/
#ifndef MIN
# define MIN(a,b) (a < b ? a : b)
#endif
#ifndef MAX
# define MAX(a,b) (a > b ? a : b)
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/* Utitilies to handle unaligned or byte swapped accesses */
EXTERN uint16_t fat_getuint16(uint8_t *ptr);
EXTERN uint32_t fat_getuint32(uint8_t *ptr);
EXTERN void fat_putuint16(uint8_t *ptr, uint16_t value16);
EXTERN void fat_putuint32(uint8_t *ptr, uint32_t value32);
/* Manage the per-mount semaphore that protects access to shared resources */
EXTERN void fat_semtake(struct fat_mountpt_s *fs);
EXTERN void fat_semgive(struct fat_mountpt_s *fs);
/* Get the current time for FAT creation and write times */
EXTERN uint32_t fat_systime2fattime(void);
EXTERN time_t fat_fattime2systime(uint16_t fattime, uint16_t fatdate);
/* Handle hardware interactions for mounting */
EXTERN int fat_mount(struct fat_mountpt_s *fs, bool writeable);
EXTERN int fat_checkmount(struct fat_mountpt_s *fs);
/* low-level hardware access */
EXTERN int fat_hwread(struct fat_mountpt_s *fs, uint8_t *buffer,
off_t sector, unsigned int nsectors);
EXTERN int fat_hwwrite(struct fat_mountpt_s *fs, uint8_t *buffer,
off_t sector, unsigned int nsectors);
/* Cluster / cluster chain access helpers */
EXTERN off_t fat_cluster2sector(struct fat_mountpt_s *fs, uint32_t cluster);
EXTERN off_t fat_getcluster(struct fat_mountpt_s *fs, uint32_t clusterno);
EXTERN int fat_putcluster(struct fat_mountpt_s *fs, uint32_t clusterno,
off_t startsector);
EXTERN int fat_removechain(struct fat_mountpt_s *fs, uint32_t cluster);
EXTERN int32_t fat_extendchain(struct fat_mountpt_s *fs, uint32_t cluster);
#define fat_createchain(fs) fat_extendchain(fs, 0)
/* Help for traversing directory trees and accessing directory entries */
EXTERN int fat_nextdirentry(struct fat_mountpt_s *fs, struct fs_fatdir_s *dir);
EXTERN int fat_finddirentry(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo,
const char *path);
EXTERN int fat_dirnamewrite(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo);
EXTERN int fat_dirwrite(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo,
uint8_t attributes, uint32_t fattime);
EXTERN int fat_allocatedirentry(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo);
EXTERN int fat_freedirentry(struct fat_mountpt_s *fs, struct fat_dirseq_s *seq);
EXTERN int fat_dirname2path(struct fat_mountpt_s *fs, struct fs_dirent_s *dir);
/* File creation and removal helpers */
EXTERN int fat_dirtruncate(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo);
EXTERN int fat_dircreate(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo);
EXTERN int fat_remove(struct fat_mountpt_s *fs, const char *relpath, bool directory);
/* Mountpoint and file buffer cache (for partial sector accesses) */
EXTERN int fat_fscacheflush(struct fat_mountpt_s *fs);
EXTERN int fat_fscacheread(struct fat_mountpt_s *fs, off_t sector);
EXTERN int fat_ffcacheflush(struct fat_mountpt_s *fs, struct fat_file_s *ff);
EXTERN int fat_ffcacheread(struct fat_mountpt_s *fs, struct fat_file_s *ff, off_t sector);
EXTERN int fat_ffcacheinvalidate(struct fat_mountpt_s *fs, struct fat_file_s *ff);
/* FSINFO sector support */
EXTERN int fat_updatefsinfo(struct fat_mountpt_s *fs);
EXTERN int fat_nfreeclusters(struct fat_mountpt_s *fs, off_t *pfreeclusters);
EXTERN int fat_currentsector(struct fat_mountpt_s *fs, struct fat_file_s *ff, off_t position);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __FS_FAT_FS_FAT32_H */
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