fat.h

WinCE 3.0 BSP, 包含Inter SA1110, Intel_815E, Advantech_PCM9574 等

/*++
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.
Copyright (c) 1995-2000  Microsoft Corporation

Module Name: fat.h

Abstract: Boot loader FAT support code.

Functions: None.

Notes:

--*/

#ifndef _FAT_H_
#define _FAT_H_

// Preprocessor definitions.
//
#define PARTSIG_SIZE    2       // partition signature size (in bytes)
#define PARTTBL_SIZE    64      // whole partition table size (in bytes)
#define PARTACTV_FLAG   0x80    // active partition flag
#define MAX_PARTITIONS  4       // total number of partition table entries
#define SECTOR_SIZE     512     // sector size (in bytes)
#define FAT_EOF         0xfffe  // EOF tag

// FAT boot sector header.
//
#pragma pack(1)
typedef struct
{
    UCHAR rsvd1[3];     // jmp instruction
    UCHAR oemname[8];
    USHORT bytespsect;
    UCHAR sectspclust;
    USHORT numrsvdsects;
    UCHAR numfats;
    USHORT numrootentry;
    USHORT numsects;
    UCHAR mediadesc;
    USHORT sectspfat;
    USHORT sectsptrk;
    USHORT numheads;
    ULONG numhdnsects;
    ULONG numsectshuge;
    UCHAR drivenum;
    UCHAR rsvd2;
    UCHAR sig;
    ULONG volid;
    UCHAR vollabel[11];
    UCHAR fstype[8];
} BSECTHDR, *PBSECTHDR;

// FAT partition table.
//
#pragma pack(1)
typedef struct
{
    UCHAR actvflg;
    UCHAR ssect;
    UCHAR shd;
    UCHAR scyl;
    UCHAR type;
    UCHAR esect;
    UCHAR ehd;
    UCHAR ecyl;
    ULONG slba;
    ULONG size;
} PARTTE, *PPARTTE;

// FAT directory entry.
//
#pragma pack(1)
typedef struct
{
    UCHAR fname[8];
    UCHAR fext[3];
    UCHAR fattr;
    UCHAR foo[10];
    USHORT lmodtime;
    USHORT lmoddate;
    USHORT fclust;
    ULONG fsize;
} DIRENTRY, *PDIRENTRY;


// BIN image and record headers
//
#pragma pack(1)
typedef struct			// Image header (one per BIN image)
{
    CHAR syncbytes[7];
    ULONG imgaddr;
    ULONG imglen;
} IMGHDR, *PIMGHDR;

#pragma pack(1)
typedef struct			// Record header (one per section in image)
{
    ULONG recaddr;
    ULONG reclen;
    ULONG recchksum;
} RECHDR, *PRECHDR;

// File information structure.
//
typedef struct
{
    USHORT curclust;
    ULONG fsize;
    ULONG cursect;
    UCHAR sectreminclust;
    USHORT byteofst;
    USHORT bytesreminsect;
    USHORT clusttlbofst;
} FILEINFO, *PFILEINFO;


// Function prototypes
//
int init_fat(void);
int file_open(PUCHAR pfname);
int file_close(void);
int file_read(PUCHAR pbuf, ULONG len);
int build_clust_list(void);


#endif	// _FAT_H_.