saio.h

操作系统SunOS 4.1.3版本的源码

/*	@(#)saio.h 1.1 92/07/30 SMI	*/

/*
 * Copyright (c) 1985 by Sun Microsystems, Inc.
 */

/*
 * header file for standalone I/O package
 */

#include <sys/types.h>
#include <mon/sunromvec.h>

/*
 * io block: the structure passed to or from the device drivers.
 * 
 * Includes pointers to the device
 * in use, a pointer to device-specific data (iopb's or device
 * state information, typically), cells for the use of seek, etc.
 * NOTE: expand at end to preserve compatibility with PROMs
 */
struct saioreq {
	char	si_flgs;
	struct boottab *si_boottab;	/* Points to boottab entry if any */
	char	*si_devdata;		/* Device-specific data pointer */
	int	si_ctlr;		/* Controller number or address */
	int	si_unit;		/* Unit number within controller */
	daddr_t	si_boff;		/* Partition number within unit */
	daddr_t	si_cyloff;
	off_t	si_offset;
	daddr_t	si_bn;			/* Block number to R/W */
	char	*si_ma;			/* Memory address to R/W */
	int	si_cc;			/* Character count to R/W */
	struct	saif *si_sif;		/* interface pointer */
	char 	*si_devaddr;		/* Points to mapped in device */
	char	*si_dmaaddr;		/* Points to allocated DMA space */
};


#define F_READ	01
#define F_WRITE	02
#define F_ALLOC	04
#define F_FILE	010
#define	F_EOF	020	/* EOF on device */
#define F_AJAR	040	/* Descriptor is "ajar:" stopped but not closed. */

/*
 * request codes. Must be the same as F_XXX above
 */
#define	READ	F_READ
#define	WRITE	F_WRITE

/*
 * how many files can be open at once.
 */
#define NFILES	3

/*
 * Ethernet interface descriptor
 */
struct saif {
	int	(*sif_xmit)();		/* transmit packet */
	int	(*sif_poll)();		/* check for and receive packet */
	int	(*sif_reset)();		/* reset interface */
	int	(*sif_macaddr)();	/* MAC address/ ethernet address */
	int	(*sif_prstats)();	/* print cumulative statistics */
};

/*
 * Types of resources that can be allocated by resalloc().
 */
enum RESOURCES { 
	RES_MAINMEM,		/* Main memory, accessible to CPU */
	RES_RAWVIRT,		/* Raw addr space that can be mapped */
	RES_DMAMEM,		/* Memory acc. by CPU and by all DMA I/O */
	RES_DMAVIRT,		/* Raw addr space accessible by DMA I/O */
};
char *resalloc(), *devalloc();


/*
 * Delay units are in microseconds.
 */
#ifdef sparc
#undef	DELAY
#define DELAY(n)        usec_delay(n)
#undef	CDELAY
#define CDELAY(c, n)    \
{ \
        register int N = n; \
        while (--N > 0) { \
                if (c) \
                        break; \
                usec_delay(1); \
        } \
}
#else
#undef DELAY
#define	DELAY(n)	\
{ \
	extern int cpudelay; \
	register int N = (((n)<<4) >> cpudelay); \
 \
	while (--N > 0) ; \
}

#undef CDELAY
#define	CDELAY(c, n)	\
{ \
	extern int cpudelay; \
	register int N = (((n)<<3) >> cpudelay); \
 \
	while (--N > 0) \
		if (c) \
			break; \
}
#endif

/*
 * Translate our virtual address (in DMA-able memory) into a physical DMA
 * address, as it would appear to a Multibus device.  (In VMEbus systems,
 * this assumes a MB/VME adapter.)
 */
#define	MB_DMA_ADDR(x)	(((int)(x))&0x000FFFFF)