minix/include/minix/dmap.h
2005-09-16 14:23:14 +00:00

59 lines
2.4 KiB
C

#ifndef _DMAP_H
#define _DMAP_H
#include <minix/sys_config.h>
#include <minix/ipc.h>
/*===========================================================================*
* Device <-> Driver Table *
*===========================================================================*/
/* Device table. This table is indexed by major device number. It provides
* the link between major device numbers and the routines that process them.
* The table can be update dynamically. The field 'dmap_flags' describe an
* entry's current status and determines what control options are possible.
*/
#define DMAP_MUTABLE 0x01 /* mapping can be overtaken */
#define DMAP_BUSY 0x02 /* driver busy with request */
enum dev_style { STYLE_DEV, STYLE_NDEV, STYLE_TTY, STYLE_CLONE };
extern struct dmap {
int _PROTOTYPE ((*dmap_opcl), (int, Dev_t, int, int) );
void _PROTOTYPE ((*dmap_io), (int, message *) );
int dmap_driver;
int dmap_flags;
} dmap[];
/*===========================================================================*
* Major and minor device numbers *
*===========================================================================*/
/* Total number of different devices. */
#define NR_DEVICES 32 /* number of (major) devices */
/* Major and minor device numbers for MEMORY driver. */
#define MEMORY_MAJOR 1 /* major device for memory devices */
# define RAM_DEV 0 /* minor device for /dev/ram */
# define MEM_DEV 1 /* minor device for /dev/mem */
# define KMEM_DEV 2 /* minor device for /dev/kmem */
# define NULL_DEV 3 /* minor device for /dev/null */
# define BOOT_DEV 4 /* minor device for /dev/boot */
# define ZERO_DEV 5 /* minor device for /dev/zero */
#define CTRLR(n) ((n)==0 ? 3 : (8 + 2*((n)-1))) /* magic formula */
/* Full device numbers that are special to the boot monitor and FS. */
# define DEV_RAM 0x0100 /* device number of /dev/ram */
# define DEV_BOOT 0x0104 /* device number of /dev/boot */
#define FLOPPY_MAJOR 2 /* major device for floppy disks */
#define TTY_MAJOR 4 /* major device for ttys */
#define CTTY_MAJOR 5 /* major device for /dev/tty */
#define INET_MAJOR 7 /* major device for inet */
#define LOG_MAJOR 15 /* major device for log driver */
# define IS_KLOG_DEV 0 /* minor device for /dev/klog */
#endif /* _DMAP_H */