4.1cBSD/a/sys/vax/param.h

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/*	param.h	4.2	82/12/09	*/

/*
 * Machine dependent constants for vax.
 */
#define	NBPG	512		/* bytes/page */
#define	PGOFSET	(NBPG-1)	/* byte offset into page */
#define	PGSHIFT	9		/* LOG2(NBPG) */

#define	CLSIZE		2
#define	CLSIZELOG2	1

#define	SSIZE	4		/* initial stack size/NBPG */
#define	SINCR	4		/* increment of stack/NBPG */

#define	UPAGES	8		/* pages of u-area */

/*
 * Some macros for units conversion
 */
/* Core clicks (512 bytes) to segments and vice versa */
#define	ctos(x)	(x)
#define	stoc(x)	(x)

/* Core clicks (512 bytes) to disk blocks */
#define	ctod(x)	(x)
#define	dtoc(x)	(x)
#define	dtob(x)	((x)<<9)

/* clicks to bytes */
#define	ctob(x)	((x)<<9)

/* bytes to clicks */
#define	btoc(x)	((((unsigned)(x)+511)>>9))

/*
 * Macros to decode processor status word.
 */
#define	USERMODE(ps)	(((ps) & PSL_CURMOD) == PSL_CURMOD)
#define	BASEPRI(ps)	(((ps) & PSL_IPL) == 0)

#define	DELAY(n)	{ register int N = (n); while (--N > 0); }