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FAT big endian changes

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git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1419 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Greg Watson
2004-03-17 17:03:02 +00:00
parent f6d05f501e
commit 582231ed01
2 changed files with 61 additions and 41 deletions
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42
src/include/fs/fat.h
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@@ -42,25 +42,27 @@ struct fat_bpb {
__u8 reserved_sects[2]; /* reserved sectors */
__u8 num_fats; /* number of FATs */
__u8 dir_entries[2]; /* root directory entries */
__u8 short_sectors[2]; /* number of sectors */
__u8 short_sectors[2];/* number of sectors */
__u8 media; /* media code (unused) */
__u16 fat_length; /* sectors/FAT */
__u16 secs_track; /* sectors per track */
__u16 heads; /* number of heads */
__u32 hidden; /* hidden sectors (unused) */
__u32 long_sectors; /* number of sectors (if short_sectors == 0) */
__u8 fat_length[2]; /* sectors/FAT */
__u8 secs_track[2]; /* sectors per track */
__u8 heads[2]; /* number of heads */
__u8 hidden[2]; /* hidden sectors (unused) */
__u8 long_sectors[2];/* number of sectors (if short_sectors == 0) */
/* The following fields are only used by FAT32 */
__u32 fat32_length; /* sectors/FAT */
__u16 flags; /* bit 8: fat mirroring, low 4: active fat */
__u8 fat32_length[2];/* sectors/FAT */
__u8 flags[2]; /* bit 8: fat mirroring, low 4: active fat */
__u8 version[2]; /* major, minor filesystem version */
__u32 root_cluster; /* first cluster in root directory */
__u16 info_sector; /* filesystem info sector */
__u16 backup_boot; /* backup boot sector */
__u16 reserved2[6]; /* Unused */
__u8 root_cluster[4];/* first cluster in root directory */
__u8 info_sector[2]; /* filesystem info sector */
__u8 backup_boot[2]; /* backup boot sector */
__u8 reserved2[12]; /* Unused */
};
#define FAT_CVT_U16(bytarr) (* (__u16*)(bytarr))
#define FAT_CVT_U8(byte) (* (__u8*)(byte))
#define FAT_CVT_U16(bytarr) le16_to_cpu(* (__u16*)(bytarr))
#define FAT_CVT_U32(bytarr) le32_to_cpu(* (__u32*)(bytarr))
/*
* Defines how to differentiate a 12-bit and 16-bit FAT.
@@ -84,17 +86,17 @@ struct fat_bpb {
#define FAT_DIRENTRY_LENGTH 32
#define FAT_DIRENTRY_ATTRIB(entry) \
(*((unsigned char *) (entry+11)))
FAT_CVT_U8(entry+11)
#define FAT_DIRENTRY_VALID(entry) \
( ((*((unsigned char *) entry)) != 0) \
&& ((*((unsigned char *) entry)) != 0xE5) \
( (FAT_CVT_U8(entry) != 0) \
&& (FAT_CVT_U8(entry) != 0xE5) \
&& !(FAT_DIRENTRY_ATTRIB(entry) & FAT_ATTRIB_NOT_OK_MASK) )
#define FAT_DIRENTRY_FIRST_CLUSTER(entry) \
((*((unsigned short *) (entry+26)))+(*((unsigned short *) (entry+20)) << 16))
(FAT_CVT_U16(entry+26)+(FAT_CVT_U16(entry+20) << 16))
#define FAT_DIRENTRY_FILELENGTH(entry) \
(*((unsigned long *) (entry+28)))
FAT_CVT_U32(entry+28)
#define FAT_LONGDIR_ID(entry) \
(*((unsigned char *) (entry)))
FAT_CVT_U8(entry)
#define FAT_LONGDIR_ALIASCHECKSUM(entry) \
(*((unsigned char *) (entry+13)))
FAT_CVT_U8(entry+13)