devices.h

完整的Bell实验室的嵌入式文件系统TFS

/* device structure:
 *  This structure defines the basic information needed for device
 *  control.  The table of devices is initialized at compile time
 *  with each device assigned an integer device descriptor.
 */
struct device {
    int     (*init)(unsigned long);
    int     (*ctrl)(int,unsigned long,unsigned long);
    int     (*open)(unsigned long,unsigned long);
    int     (*close)();
    int     (*read)(char *,int);
    int     (*write)(char *,int);
    char    *name;
};

extern struct device    devtbl[];

/* Generic driver functions: */
extern  int open(int, unsigned long, unsigned long);
extern  int close(int);
extern  int read(int, char *, int);
extern  int write(int, char *, int);
extern  int init(int, unsigned long);
extern  int ioctl(int, int, unsigned long, unsigned long);
extern  int devInit(int);
extern  int isbaddev(int);
extern  void devtbldump(void);

/* Common ioctl definitions: */
#define INIT        1
#define GOTACHAR    2
#define SETBAUD     3

#define nodriver    0

extern int ConsoleDevice;