/*	$OpenBSD: param.h,v 1.10 2000/07/28 13:04:29 rahnds Exp $	*/
/*	$NetBSD: param.h,v 1.1 1996/09/30 16:34:28 ws Exp $	*/

/*-
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * 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 TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 */

#ifdef	_KERNEL
#ifndef	_LOCORE
#include <machine/cpu.h>
#endif	/* _LOCORE */
#endif

/*
 * Machine dependent constants for PowerPC (32-bit only currently)
 */
#define	MACHINE		"powerpc"
#define	_MACHINE	powerpc
#define	MACHINE_ARCH	"powerpc"
#define	_MACHINE_ARCH	powerpc

#define	MID_MACHINE	0	/* None but has to be defined */

#define	ALIGNBYTES	(sizeof(double) - 1)
#define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)

#define	PGSHIFT		12
#define	NBPG		4096
#define	PGOFSET		(NBPG - 1)

#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
#define	DEV_BSIZE	(1 << DEV_BSHIFT)
#define	BLKDEV_IOSIZE	NBPG
#define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */

#define	CLSIZELOG2	0
#define	CLSIZE		(1 << CLSIZELOG2)

#define	UPAGES		4
#define	USPACE		(UPAGES * NBPG)

#define	KERNBASE	0x100000

/*
 * 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	MCLSHIFT	11		/* convert bytes to m_buf clusters */
#define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
#define	MCLOFSET	(MCLBYTES - 1)

#ifndef NMBCLUSTERS
#ifdef GATEWAY
#define	NMBCLUSTERS	2048		/* map size, max cluster allocation */
#else
#define	NMBCLUSTERS	1024		/* map size, max cluster allocation */
#endif
#endif

#define MSGBUFSIZE	NBPG

/*
 * Size of kernel malloc arena in CLBYTES-sized logical pages.
 */
#ifndef	NKMEMCLUSTERS
#define	NKMEMCLUSTERS	(16 * 1024 * 1024 / CLBYTES)
#endif

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

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

/*
 * Mach derived conversion macros
 */
#define powerpc_btop(x)	((unsigned)(x) >> PGSHIFT)
#define powerpc_ptob(x)	((unsigned)(x) << PGSHIFT)

/*
 * Segment handling stuff
 */
#define	SEGMENT_LENGTH	0x10000000
#define	SEGMENT_MASK	0xf0000000

/*
 * Fixed segments
 */
#define	USER_SR		13
#define	KERNEL_SR	14
#define	KERNEL_SEGMENT	(0xfffff0 + KERNEL_SR)
#define	EMPTY_SEGMENT	0xfffff0
#define	USER_ADDR	((void *)(USER_SR << ADDR_SR_SHFT))

/*
 * Some system constants
 */
/* do not define HTABENTS, allow system size to determine # entries */
#if 0
#ifndef	HTABENTS
#define	HTABENTS	1024	/* Number of hashslots in HTAB */
#endif
#endif
#ifndef	NPMAPS
#define	NPMAPS		32768	/* Number of pmaps in system */
#endif

/*
 * Temporary kludge till we do (ov)bcopy in assembler
 */
#define	ovbcopy	bcopy