xref: /csrg-svn/sys/sparc/include/param.h (revision 69467)

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)param.h	8.3 (Berkeley) 05/14/95
 *
 * from: $Header: param.h,v 1.13 92/11/26 02:04:38 torek Exp $ (LBL)
 */

/*
 * Machine dependent constants for Sun-4c (SPARCstation)
 */
#define	MACHINE	"sparc"
#define NCPUS 1

#ifdef KERNEL				/* XXX */
#include <machine/cpu.h>		/* XXX */
#endif					/* XXX */

/*
 * Round p (pointer or byte index) up to a correctly-aligned value for
 * the machine's strictest data type.  The result is u_int and must be
 * cast to any desired pointer type.
 */
#define	ALIGNBYTES	7
#define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)

#define	NBPG		4096		/* bytes/page */
#define	PGOFSET		(NBPG-1)	/* byte offset into page */
#define	PGSHIFT		12		/* log2(NBPG) */

#define	KERNBASE	0xf8000000	/* start of kernel virtual space */
#define	KERNTEXTOFF	0xf8004000	/* start of kernel text */
#define	BTOPKERNBASE	((u_long)KERNBASE >> PG_SHIFT)

#define	DEV_BSIZE	512
#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
#define	BLKDEV_IOSIZE	2048
#define	MAXPHYS		(64 * 1024)

#define	CLSIZE		1
#define	CLSIZELOG2	0

/* NOTE: SSIZE and UPAGES must be multiples of CLSIZE */
#define	SSIZE		1		/* initial stack size/NBPG */
#define	UPAGES		2		/* pages of u-area */

/*
 * Constants related to network buffer management.
 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
 * on machines that exchange pages of input or output buffers with mbuf
 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 * of the hardware page size.
 */
#define	MSIZE		128		/* size of an mbuf */
#define	MCLBYTES	2048		/* enough for whole Ethernet packet */
#define	MCLSHIFT	11		/* log2(MCLBYTES) */
#define	MCLOFSET	(MCLBYTES - 1)

#ifndef NMBCLUSTERS
#ifdef GATEWAY
#define	NMBCLUSTERS	512		/* map size, max cluster allocation */
#else
#define	NMBCLUSTERS	256		/* map size, max cluster allocation */
#endif
#endif

/*
 * Size of kernel malloc arena in CLBYTES-sized logical pages.
 */
#ifndef	NKMEMCLUSTERS
#define	NKMEMCLUSTERS	(6 * 1024 * 1024 / CLBYTES)
#endif

/* pages ("clicks") (4096 bytes) to disk blocks */
#define	ctod(x)	((x) << (PGSHIFT - DEV_BSHIFT))
#define	dtoc(x)	((x) >> (PGSHIFT - DEV_BSHIFT))
#define	dtob(x)	((x) << DEV_BSHIFT)

/* pages to bytes */
#define	ctob(x)	((x) << PGSHIFT)

/* bytes to pages */
#define	btoc(x)	(((unsigned)(x) + PGOFSET) >> PGSHIFT)

#define	btodb(bytes)		/* calculates (bytes / DEV_BSIZE) */ \
	((bytes) >> DEV_BSHIFT)
#define	dbtob(db)		/* calculates (db * DEV_BSIZE) */ \
	((db) << DEV_BSHIFT)

/*
 * Map a ``block device block'' to a file system block.
 * This should be device dependent, and should use the bsize
 * field from the disk label.
 * For now though just use DEV_BSIZE.
 */
#define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))

#ifdef KERNEL
#ifndef LOCORE
#define	DELAY(n)	delay(n)
#endif
#else
#define	DELAY(n)	{ register volatile int N = (n); while (--N > 0); }
#endif

#ifndef _SIMPLELOCK_H_
#define _SIMPLELOCK_H_
/*
 * A simple spin lock.
 *
 * This structure only sets one bit of data, but is sized based on the
 * minimum word size that can be operated on by the hardware test-and-set
 * instruction. It is only needed for multiprocessors, as uniprocessors
 * will always run to completion or a sleep. It is an error to hold one
 * of these locks while a process is sleeping.
 */
struct simplelock {
	int	lock_data;
};

#if !defined(DEBUG) && NCPUS > 1
/*
 * The simple-lock routines are the primitives out of which the lock
 * package is built. The machine-dependent code must implement an
 * atomic test_and_set operation that indivisibly sets the simple lock
 * to non-zero and returns its old value. It also assumes that the
 * setting of the lock to zero below is indivisible. Simple locks may
 * only be used for exclusive locks.
 */
static __inline void
simple_lock_init(lkp)
	struct simplelock *lkp;
{

	lkp->lock_data = 0;
}

static __inline void
simple_lock(lkp)
	__volatile struct simplelock *lkp;
{

	while (test_and_set(&lkp->lock_data))
		continue;
}

static __inline int
simple_lock_try(lkp)
	__volatile struct simplelock *lkp;
{

	return (!test_and_set(&lkp->lock_data))
}

static __inline void
simple_unlock(lkp)
	__volatile struct simplelock *lkp;
{

	lkp->lock_data = 0;
}
#endif /* NCPUS > 1 */
#endif /* !_SIMPLELOCK_H_ */