120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/**
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* fs_const.h
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* This file contains consts and macros associated with filesystem.
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* The code is added by zcr, and the file is added by xw. 18/6/17
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*/
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/* TTY */
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#define NR_CONSOLES 3 /* consoles */
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/* max() & min() */
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#define max(a,b) ((a) > (b) ? (a) : (b))
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#define min(a,b) ((a) < (b) ? (a) : (b))
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/* macros for messages */
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#define FD u.m3.m3i1
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#define PATHNAME u.m3.m3p1
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#define FLAGS u.m3.m3i1
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#define NAME_LEN u.m3.m3i2
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#define CNT u.m3.m3i2
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#define REQUEST u.m3.m3i2
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#define PROC_NR u.m3.m3i3
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#define DEVICE u.m3.m3i4
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#define POSITION u.m3.m3l1
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#define BUF u.m3.m3p2
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#define OFFSET u.m3.m3i2
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#define WHENCE u.m3.m3i3
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#define RETVAL u.m3.m3i1
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#define DIOCTL_GET_GEO 1
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/* Hard Drive */
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#define SECTOR_SIZE 512
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#define SECTOR_BITS (SECTOR_SIZE * 8)
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#define SECTOR_SIZE_SHIFT 9
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/* major device numbers (corresponding to kernel/global.c::dd_map[]) */
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#define NO_DEV 0
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#define DEV_FLOPPY 1
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#define DEV_CDROM 2
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#define DEV_HD 3
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#define DEV_CHAR_TTY 4
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#define DEV_SCSI 5
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/* make device number from major and minor numbers */
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#define MAJOR_SHIFT 8
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#define MAKE_DEV(a,b) ((a << MAJOR_SHIFT) | b)
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/* separate major and minor numbers from device number */
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#define MAJOR(x) ((x >> MAJOR_SHIFT) & 0xFF)
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#define MINOR(x) (x & 0xFF)
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#define INVALID_INODE 0
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#define ROOT_INODE 1
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#define MAX_DRIVES 2
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#define NR_PART_PER_DRIVE 4 // 每块硬盘(驱动器)只能有4个主分区, mingxuan
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#define NR_SUB_PER_PART 16 // 每个扩展分区最多有16个逻辑分区, mingxuan
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#define NR_SUB_PER_DRIVE (NR_SUB_PER_PART * NR_PART_PER_DRIVE) //每块硬盘(驱动器)最多有16 * 4 = 64个逻辑分区, mingxuan
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#define NR_PRIM_PER_DRIVE (NR_PART_PER_DRIVE + 1) // 表示的是hd[0～4]这5个分区，因为有些代码中我们把整块硬盘（hd0）和主分区（hd[1～4]）放在一起看待, mingxuan
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/**
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* @def MAX_PRIM
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* Defines the max minor number of the primary partitions.
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* If there are 2 disks, prim_dev ranges in hd[0-9], this macro will
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* equals 9.
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*/
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// MAX_PRIM定义的是主分区的最大值，比如若有两块硬盘，那第一块硬盘的主分区为hd[1～4]，第二块硬盘的主分区为hd[6～9]
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// 所以MAX_PRIM为9，我们定义的hd1a的设备号应大于它，这样通过与MAX_PRIM比较，我们就可以知道一个设备是主分区还是逻辑分区
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// mingxuan
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#define MAX_PRIM (MAX_DRIVES * NR_PRIM_PER_DRIVE - 1) // MAX_PRIM = 2 * 4 - 1 = 9
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#define MAX_SUBPARTITIONS (NR_SUB_PER_DRIVE * MAX_DRIVES) // MAX_SUBPARTITIONS = 64 * 2 = 128
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/* name of drives */
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// added by mingxuan 2020-10-27
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#define PRIMARY_MASTER 0x0
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#define PRIMARY_SLAVE 0x1
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#define SECONDARY_MASTER 0x2
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#define SECONDARY_SLAVE 0x3
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/* device numbers of hard disk */
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#define MINOR_hd0 0x0 // added by mingxuan 2020-10-9
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#define MINOR_hd1 0x1 // added by mingxuan 2020-10-12
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#define MINOR_hd2 0x2 // added by mingxuan 2020-10-12
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#define MINOR_hd1a 0x10
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#define MINOR_hd2a (MINOR_hd1a + NR_SUB_PER_PART) // MINOR_hd2a = 16 + 16
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#define MAJOR_FAT 0x4 //modified by mingxuan 2020-10-22
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#define MINOR_BOOT MINOR_hd2 //modified by mingxuan 2020-10-12
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#define P_PRIMARY 0
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#define P_EXTENDED 1
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#define ORANGES_PART 0x99 /* Orange'S partition */
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#define NO_PART 0x00 /* unused entry */
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#define EXT_PART 0x05 /* extended partition */
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#define NR_FILE_DESC 128 /* FIXME */ //modified by mingxuan 2019-5-19
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#define NR_INODE 64 /* FIXME */
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#define NR_SUPER_BLOCK 8
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/* INODE::i_mode (octal, lower 32 bits reserved) */
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#define I_TYPE_MASK 0170000
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#define I_REGULAR 0100000
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#define I_BLOCK_SPECIAL 0060000
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#define I_DIRECTORY 0040000
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#define I_CHAR_SPECIAL 0020000
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#define I_NAMED_PIPE 0010000
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#define is_special(m) ((((m) & I_TYPE_MASK) == I_BLOCK_SPECIAL) || \
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(((m) & I_TYPE_MASK) == I_CHAR_SPECIAL))
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#define NR_DEFAULT_FILE_SECTS 2048 /* 2048 * 512 = 1MB */
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#define FSBUF_SIZE 0x100000 //added by mingxuan 2019-5-17
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