driver.h

Minix3.11的源码。[MINIX 3是一个为高可靠性应用而设计的自由且简洁的类UNIX系统。]

/* Types and constants shared between the generic and device dependent
 * device driver code.
 */

#define _POSIX_SOURCE      1	/* tell headers to include POSIX stuff */
#define _MINIX             1	/* tell headers to include MINIX stuff */
#define _SYSTEM		   1	/* get negative error number in <errno.h> */

/* The following are so basic, all the *.c files get them automatically. */
#include <minix/config.h>	/* MUST be first */
#include <ansi.h>		/* MUST be second */
#include <minix/type.h>
#include <minix/ipc.h>
#include <minix/com.h>
#include <minix/callnr.h>
#include <sys/types.h>
#include <minix/const.h>
#include <minix/syslib.h>
#include <minix/sysutil.h>

#include <string.h>
#include <limits.h>
#include <stddef.h>
#include <errno.h>

#include <minix/partition.h>
#include <minix/u64.h>

/* Info about and entry points into the device dependent code. */
struct driver {
  _PROTOTYPE( char *(*dr_name), (void) );
  _PROTOTYPE( int (*dr_open), (struct driver *dp, message *m_ptr) );
  _PROTOTYPE( int (*dr_close), (struct driver *dp, message *m_ptr) );
  _PROTOTYPE( int (*dr_ioctl), (struct driver *dp, message *m_ptr) );
  _PROTOTYPE( struct device *(*dr_prepare), (int device) );
  _PROTOTYPE( int (*dr_transfer), (int proc_nr, int opcode, off_t position,
					iovec_t *iov, unsigned nr_req) );
  _PROTOTYPE( void (*dr_cleanup), (void) );
  _PROTOTYPE( void (*dr_geometry), (struct partition *entry) );
  _PROTOTYPE( void (*dr_signal), (struct driver *dp, message *m_ptr) );
  _PROTOTYPE( void (*dr_alarm), (struct driver *dp, message *m_ptr) );
  _PROTOTYPE( int (*dr_cancel), (struct driver *dp, message *m_ptr) );
  _PROTOTYPE( int (*dr_select), (struct driver *dp, message *m_ptr) );
  _PROTOTYPE( int (*dr_other), (struct driver *dp, message *m_ptr) );
  _PROTOTYPE( int (*dr_hw_int), (struct driver *dp, message *m_ptr) );
};

#if (CHIP == INTEL)

/* Number of bytes you can DMA before hitting a 64K boundary: */
#define dma_bytes_left(phys)    \
   ((unsigned) (sizeof(int) == 2 ? 0 : 0x10000) - (unsigned) ((phys) & 0xFFFF))

#endif /* CHIP == INTEL */

/* Base and size of a partition in bytes. */
struct device {
  u64_t dv_base;
  u64_t dv_size;
};

#define NIL_DEV		((struct device *) 0)

/* Functions defined by driver.c: */
_PROTOTYPE( void driver_task, (struct driver *dr) );
_PROTOTYPE( char *no_name, (void) );
_PROTOTYPE( int do_nop, (struct driver *dp, message *m_ptr) );
_PROTOTYPE( struct device *nop_prepare, (int device) );
_PROTOTYPE( void nop_cleanup, (void) );
_PROTOTYPE( void nop_task, (void) );
_PROTOTYPE( void nop_signal, (struct driver *dp, message *m_ptr) );
_PROTOTYPE( void nop_alarm, (struct driver *dp, message *m_ptr) );
_PROTOTYPE( int nop_cancel, (struct driver *dp, message *m_ptr) );
_PROTOTYPE( int nop_select, (struct driver *dp, message *m_ptr) );
_PROTOTYPE( int do_diocntl, (struct driver *dp, message *m_ptr) );

/* Parameters for the disk drive. */
#define SECTOR_SIZE      512	/* physical sector size in bytes */
#define SECTOR_SHIFT       9	/* for division */
#define SECTOR_MASK      511	/* and remainder */

/* Size of the DMA buffer buffer in bytes. */
#define USE_EXTRA_DMA_BUF  0	/* usually not needed */
#define DMA_BUF_SIZE	(DMA_SECTORS * SECTOR_SIZE)

#if (CHIP == INTEL)
extern u8_t *tmp_buf;			/* the DMA buffer */
#else
extern u8_t tmp_buf[];			/* the DMA buffer */
#endif
extern phys_bytes tmp_phys;		/* phys address of DMA buffer */