119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1996 Erich Boleyn <erich@uruk.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "pc_slice.h"
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#define SECTORS(geom) ( (geom) & 0xFF )
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#define HEADS(geom) ( ( ( (geom) >> 8 ) & 0xFF ) + 1 )
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#define CYLINDERS(geom) ( ( ( (geom) >> 16 ) & 0x3FF ) + 1 )
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/*
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* Default to all functioning filesystems enabled
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*/
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#if !( defined(FSYS_FFS) || defined(FSYS_FAT) || defined(FSYS_EXT2FS) )
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#define FSYS_FFS
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#define FSYS_FAT
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#define FSYS_EXT2FS
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#endif
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#ifdef FSYS_FFS
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#define FSYS_FFS_NUM 1
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int ffs_mount(void);
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int ffs_read(int addr, int len);
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int ffs_dir(char *dirname);
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#else
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#define FSYS_FFS_NUM 0
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#endif
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#ifdef FSYS_FAT
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#define FSYS_FAT_NUM 1
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int fat_mount(void);
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/* XX FAT filesystem uses block filesystem code for read! */
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int fat_dir(char *dirname);
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#ifdef NO_BLOCK_FILES
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#undef NO_BLOCK_FILES
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#endif /* NO_BLOCK_FILES */
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#else
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#define FSYS_FAT_NUM 0
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#endif
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#ifdef FSYS_EXT2FS
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#define FSYS_EXT2FS_NUM 1
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int ext2fs_mount(void);
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int ext2fs_read(int addr, int len);
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int ext2fs_dir(char *dirname);
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#else
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#define FSYS_EXT2FS_NUM 0
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#endif
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#ifndef NUM_FSYS
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#define NUM_FSYS ( FSYS_FFS_NUM + FSYS_FAT_NUM + FSYS_EXT2FS_NUM )
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#endif
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/* defines for the block filesystem info area */
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#ifndef NO_BLOCK_FILES
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#define BLK_CUR_FILEPOS (*((int*)FSYS_BUF))
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#define BLK_CUR_BLKLIST (*((int*)(FSYS_BUF+4)))
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#define BLK_CUR_BLKNUM (*((int*)(FSYS_BUF+8)))
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#define BLK_MAX_ADDR (FSYS_BUF+0x7FF9)
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#define BLK_BLKSTART(l) (*((int*)l))
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#define BLK_BLKLENGTH(l) (*((int*)(l+4)))
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#define BLK_BLKLIST_START (FSYS_BUF+12)
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#define BLK_BLKLIST_INC_VAL 8
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#endif /* NO_BLOCK_FILES */
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/* this next part is pretty ugly, but it keeps it in one place! */
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struct fsys_entry
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{
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char *name;
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int (*mount_func)(void);
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int (*read_func)(int addr, int len);
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int (*dir_func)(char *dirname);
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};
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#ifndef _DISK_IO_C
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extern int fsmax;
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extern int print_possibilities;
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extern struct fsys_entry fsys_table[NUM_FSYS+1];
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#else
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int fsmax;
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int print_possibilities;
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struct fsys_entry fsys_table[NUM_FSYS+1] =
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{
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#ifdef FSYS_FAT
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{ "fat", fat_mount, 0, fat_dir },
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#endif
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#ifdef FSYS_EXT2FS
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{ "ext2fs", ext2fs_mount, ext2fs_read, ext2fs_dir },
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#endif
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/* XX FFS should come last as it's superblock is commonly crossing tracks
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on floppies from track 1 to 2, while others only use 1. */
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#ifdef FSYS_FFS
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{ "ffs", ffs_mount, ffs_read, ffs_dir },
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#endif
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{ 0, 0, 0, 0 }
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};
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#endif
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