/*	$OpenBSD: param.h,v 1.11 1997/10/02 22:55:43 niklas Exp $ */
/*      $NetBSD: param.h,v 1.24 1997/08/05 13:28:51 ragge Exp $    */
/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. 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, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)param.h	5.8 (Berkeley) 6/28/91
 */

#ifndef _VAX_PARAM_H_
#define _VAX_PARAM_H_

#include <machine/macros.h>
#include <machine/psl.h>

/*
 * Machine dependent constants for VAX.
 */

#define	_MACHINE	vax
#define	MACHINE		"vax"
#define	_MACHINE_ARCH	vax
#define	MACHINE_ARCH	"vax"
#define	MID_MACHINE	MID_VAX

/*
 * Round p (pointer or byte index) up to a correctly-aligned value
 * for all data types (int, long, ...).   The result is u_int and
 * must be cast to any desired pointer type.
 *
 * ALIGNED_POINTER is a boolean macro that checks whether an address
 * is valid to fetch data elements of type t from on this architecture.
 * This does not reflect the optimal alignment, just the possibility
 * (within reasonable limits). 
 *
 */

#define ALIGNBYTES		(sizeof (int) - 1)
#define ALIGN(p)		(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
#define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof (t) - 1)) == 0)

#define	PGSHIFT	 9				/* log2(NBPG) */
#define	NBPG     (1 << PGSHIFT)			/* (1 << PGSHIFT) bytes/page */
#define	PGOFSET	 (NBPG - 1)			/* byte offset into page */
#define	NPTEPG	 (NBPG / (sizeof (struct pte)))

#define	KERNBASE	0x80000000		/* start of kernel virtual */
#define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)

#define	DEV_BSHIFT	9			/* log2(DEV_BSIZE) */
#define	DEV_BSIZE	(1 << DEV_BSHIFT)

#define BLKDEV_IOSIZE 2048
#define	MAXPHYS		(63 * 1024)		/* max raw I/O transfer size */

#define	CLSIZELOG2	1
#define	CLSIZE		2

/* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */
#define	SSIZE	4		/* initial stack size/NBPG */
#define	SINCR	4		/* increment of stack/NBPG */

#define	UPAGES	16		/* pages of u-area */
#define USPACE  (NBPG * UPAGES)

/*
 * 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.
 */

#ifndef	MSIZE
#define	MSIZE		128		/* size of an mbuf */
#endif	/* MSIZE */

#ifndef	MCLSHIFT
#define	MCLSHIFT	10		/* convert bytes to m_buf clusters */
#endif	/* MCLSHIFT */
#define	MCLBYTES	(1 << MCLSHIFT)	/* size of an m_buf cluster */
#define	MCLOFSET	(MCLBYTES - 1)	/* offset within an m_buf cluster */

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

/*
 * Size of kernel malloc arena in CLBYTES-sized logical pages
 */ 

#ifndef NKMEMCLUSTERS
#define	NKMEMCLUSTERS	(2048 * 1024 / CLBYTES)
#endif

/*
 * Some macros for units conversion
 */

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

/* clicks to bytes */
#define	ctob(x)		((x) << PGSHIFT)
#define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
#define	btop(x)		(((unsigned)(x)) >> PGSHIFT)

/* bytes to disk blocks */
#define	btodb(x)	((x) >> DEV_BSHIFT)
#define	dbtob(x)	((x) << DEV_BSHIFT)

/*
 * Map a ``block device block'' to a file system block.
 * This should be device dependent, and will be if we
 * add an entry to cdevsw/bdevsw for that purpose.
 * For now though just use DEV_BSIZE.
 */

#define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))

#define splx(reg)					\
({							\
        int val;					\
							\
        asm __volatile ("mfpr $0x12,%0; mtpr %1,$0x12"	\
                        : "&=g" (val) : "g" (reg));	\
        val;						\
})


#define	spl0()		splx(0)		/* IPL0  */
#define splsoftclock()  splx(8)		/* IPL08 */
#define splsoftnet()    splx(0xc)	/* IPL0C */
#define	splddb()	splx(0xf)	/* IPL0F */
#define splbio()        splx(0x15)	/* IPL15 */
#define splnet()        splx(0x15)	/* IPL15 */
#define spltty()        splx(0x15)	/* IPL15 */
#define splimp()        splx(0x17)	/* IPL17 */
#define splclock()      splx(0x18)	/* IPL18 */
#define splhigh()       splx(0x1f)	/* IPL1F */
#define	splstatclock()	splclock()

/* These are better to use when playing with VAX buses */
#define	spl4()		splx(0x14)
#define	spl5()		splx(0x15)
#define	spl6()		splx(0x16)
#define	spl7()		splx(0x17)

#define	ovbcopy(x,y,z)	bcopy(x, y, z)

#if !defined(VAX410) && !defined(VAX43)
#define vmapbuf(p,q)
#define vunmapbuf(p,q)
#endif

#ifdef _KERNEL
/* Prototype needed for delay() */
#ifndef	_LOCORE
void	delay __P((int));
#endif

#define	DELAY(x) delay(x)
#endif /* _KERNEL */

#endif /* _VAX_PARAM_H_ */