sergiotarxz/nuttx-apps
sergiotarxz/nuttx-apps
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Add definitions for the FAT boot record (FBR).

Browse Source
This commit is contained in:
Gregory Nutt 2018-07-22 08:38:06 -06:00
parent 6916fa028b
commit d365707d68
1 changed files with 95 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
fsutils/mkfatfs/fat32.h
View File

@ -165,6 +165,58 @@
#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 */
/****************************************************************************
* Fat Boot Record (FBR).
*
* The FBR is always the very first sector in the partition. Validity check
* is performed by comparing the 16 bit word at offset 1FE to AA55. The
* structure of the FBR is shown below.
*
* NOTE that the fields of the FBR are equivalent to the MBR.
*/
#define FBR_OEMNAME 3 /* 8@3: Usually "MSWIN4.1" */
#define FBR_BYTESPERSEC 11 /* 2@11: Bytes per sector: 512, 1024, 2048, 4096 */
#define FBR_SECPERCLUS 13 /* 1@13: Sectors per allocation unit: 2**n, n=0..7 */
#define FBR_RESVDSECCOUNT 14 /* 2@14: Reserved sector count: Usually 32 */
#define FBR_NUMFATS 16 /* 1@16: Number of FAT data structures: always 2 */
#define FBR_ROOTENTCNT 17 /* 2@17: FAT12/16: Must be 0 for FAT32 */
#define FBR_TOTSEC16 19 /* 2@19: FAT12/16: Must be 0, see FBR_TOTSEC32 */
#define FBR_MEDIA 21 /* 1@21: Media code: f0, f8, f9-fa, fc-ff */
#define FBR_FATSZ16 22 /* 2@22: FAT12/16: Must be 0, see FBR_FATSZ32 */
#define FBR_SECPERTRK 24 /* 2@24: Sectors per track geometry value */
#define FBR_NUMHEADS 26 /* 2@26: Number of heads geometry value */
#define FBR_HIDSEC 28 /* 4@28: Count of hidden sectors preceding FAT */
#define FBR_TOTSEC32 32 /* 4@32: Total count of sectors on the volume */
#define FBR_FATSZ32 36 /* 4@36: Count of sectors occupied by one FAT (FAT32) */
#define FBR_EXTFLAGS 40 /* 2@40: Ext Flags */
#define FBR_FSVER 42 /* 2@42: FS Version */
#define FBR_ROOTCLUS 44 /* 4@44: Cluster no. of 1st cluster of root dir */
#define FBR_FSINFO 48 /* 2@48: FS Info Sector */
#define FBR_BKBOOTSEC 50 /* 2@50: Sector number of boot record. Usually 6 */
/* 52-301 Reserved */
/* The following fields are only valid for FAT12/16 */
#define FBR16_DRVNUM 36 /* 1@36: Drive number for MSDOS bootstrap */
/* 1@37: Reserved (zero) */
#define FBR16_BOOTSIG 38 /* 1@38: Extended boot signature: 0x29 if following valid */
#define FBR16_VOLID 39 /* 4@39: Volume serial number */
#define FBR16_VOLLAB 43 /* 11@43: Volume label */
#define FBR16_FILESYSTYPE 54 /* 8@54: "FAT12 ", "FAT16 ", or "FAT " */
/* The following fields are only valid for FAT32 */
#define FBR32_DRVNUM 64 /* 1@64: Drive number for MSDOS bootstrap */
#define FBR32_BOOTSIG 65 /* 1@65: Extended boot signature: 0x29 if following valid */
#define FBR32_VOLID 66 /* 4@66: Volume serial number */
#define FBR32_VOLLAB 71 /* 11@71: Volume label */
#define FBR32_FILESYSTYPE 82 /* 8@62: "FAT12 ", "FAT16 ", or "FAT " */
/* The magic bytes at the end of the MBR are common to FAT12/16/32 */
#define FBR_SIGNATURE 510 /* 2@510: Valid MBRs have 0x55aa here */
/****************************************************************************
* Each FAT "short" 8.3 file name directory entry is 32-bytes long.
*
@ -400,6 +452,14 @@
#define MBR_PUTBOOTSIG16(p,v) UBYTE_PUT(p,MBR16_BOOTSIG,v)
#define MBR_PUTBOOTSIG32(p,v) UBYTE_PUT(p,MBR32_BOOTSIG,v)
#define FBR_PUTSECPERCLUS(p,v) UBYTE_PUT(p,FBR_SECPERCLUS,v)
#define FBR_PUTNUMFATS(p,v) UBYTE_PUT(p,FBR_NUMFATS,v)
#define FBR_PUTMEDIA(p,v) UBYTE_PUT(p,FBR_MEDIA,v)
#define FBR_PUTDRVNUM16(p,v) UBYTE_PUT(p,FBR16_DRVNUM,v)
#define FBR_PUTDRVNUM32(p,v) UBYTE_PUT(p,FBR32_DRVNUM,v)
#define FBR_PUTBOOTSIG16(p,v) UBYTE_PUT(p,FBR16_BOOTSIG,v)
#define FBR_PUTBOOTSIG32(p,v) UBYTE_PUT(p,FBR32_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)
@ -430,6 +490,12 @@
#define MBR_PUTVOLID16(p,v) FAT_PUTUINT32(UBYTE_PTR(p,MBR16_VOLID),v)
#define MBR_PUTVOLID32(p,v) FAT_PUTUINT32(UBYTE_PTR(p,MBR32_VOLID),v)
#define FBR_PUTBYTESPERSEC(p,v) fat_putuint16(UBYTE_PTR(p,FBR_BYTESPERSEC),v)
#define FBR_PUTROOTENTCNT(p,v) fat_putuint16(UBYTE_PTR(p,FBR_ROOTENTCNT),v)
#define FBR_PUTTOTSEC16(p,v) fat_putuint16(UBYTE_PTR(p,FBR_TOTSEC16),v)
#define FBR_PUTVOLID16(p,v) fat_putuint32(UBYTE_PTR(p,FBR16_VOLID),v)
#define FBR_PUTVOLID32(p,v) fat_putuint32(UBYTE_PTR(p,FBR32_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)
@ -472,6 +538,20 @@
# define MBR_PUTBKBOOTSEC(p,v) FAT_PUTUINT16(UBYTE_PTR(p,MBR32_BKBOOTSEC),v)
# define MBR_PUTSIGNATURE(p,v) FAT_PUTUINT16(UBYTE_PTR(p,MBR_SIGNATURE),v)
# define FBR_PUTRESVDSECCOUNT(p,v) fat_putuint16(UBYTE_PTR(p,FBR_RESVDSECCOUNT),v)
# define FBR_PUTFATSZ16(p,v) fat_putuint16(UBYTE_PTR(p,FBR_FATSZ16),v)
# define FBR_PUTSECPERTRK(p,v) fat_putuint16(UBYTE_PTR(p,FBR_SECPERTRK),v)
# define FBR_PUTNUMHEADS(p,v) fat_putuint16(UBYTE_PTR(p,FBR_NUMHEADS),v)
# define FBR_PUTHIDSEC(p,v) fat_putuint32(UBYTE_PTR(p,FBR_HIDSEC),v)
# define FBR_PUTTOTSEC32(p,v) fat_putuint32(UBYTE_PTR(p,FBR_TOTSEC32),v)
# define FBR_PUTFATSZ32(p,v) fat_putuint32(UBYTE_PTR(p,FBR_FATSZ32),v)
# define FBR_PUTEXTFLAGS(p,v) fat_putuint16(UBYTE_PTR(p,FBR_EXTFLAGS),v)
# define FBR_PUTFSVER(p,v) fat_putuint16(UBYTE_PTR(p,FBR_FSVER),v)
# define FBR_PUTROOTCLUS(p,v) fat_putuint32(UBYTE_PTR(p,FBR_ROOTCLUS),v)
# define FBR_PUTFSINFO(p,v) fat_putuint16(UBYTE_PTR(p,FBR_FSINFO),v)
# define FBR_PUTBKBOOTSEC(p,v) fat_putuint16(UBYTE_PTR(p,FBR_BKBOOTSEC),v)
# define FBR_PUTSIGNATURE(p,v) fat_putuint16(UBYTE_PTR(p,FBR_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)
@ -515,7 +595,7 @@
#else
/* But nothing special has to be done for the little endian-case for access
* to aligned mulitbyte values.
* to aligned multibyte values.
*/
# define MBR_PUTRESVDSECCOUNT(p,v) UINT16_PUT(p,MBR_RESVDSECCOUNT,v)
@ -532,6 +612,20 @@
# define MBR_PUTBKBOOTSEC(p,v) UINT16_PUT(p,MBR32_BKBOOTSEC,v)
# define MBR_PUTSIGNATURE(p,v) UINT16_PUT(p,MBR_SIGNATURE,v)
# define FBR_PUTRESVDSECCOUNT(p,v) UINT16_PUT(p,FBR_RESVDSECCOUNT,v)
# define FBR_PUTFATSZ16(p,v) UINT16_PUT(p,FBR_FATSZ16,v)
# define FBR_PUTSECPERTRK(p,v) UINT16_PUT(p,FBR_SECPERTRK,v)
# define FBR_PUTNUMHEADS(p,v) UINT16_PUT(p,FBR_NUMHEADS,v)
# define FBR_PUTHIDSEC(p,v) UINT32_PUT(p,FBR_HIDSEC,v)
# define FBR_PUTTOTSEC32(p,v) UINT32_PUT(p,FBR_TOTSEC32,v)
# define FBR_PUTFATSZ32(p,v) UINT32_PUT(p,FBR_FATSZ32,v)
# define FBR_PUTEXTFLAGS(p,v) UINT16_PUT(p,FBR_EXTFLAGS,v)
# define FBR_PUTFSVER(p,v) UINT16_PUT(p,FBR_FSVER,v)
# define FBR_PUTROOTCLUS(p,v) UINT32_PUT(p,FBR_ROOTCLUS,v)
# define FBR_PUTFSINFO(p,v) UINT16_PUT(p,FBR_FSINFO,v)
# define FBR_PUTBKBOOTSEC(p,v) UINT16_PUT(p,FBR_BKBOOTSEC,v)
# define FBR_PUTSIGNATURE(p,v) UINT16_PUT(p,FBR_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)