williamr@2: /*-
williamr@2:  * Copyright (c) 1990 The Regents of the University of California.
williamr@2:  * All rights reserved.
williamr@2:  *
williamr@2:  * This code is derived from software contributed to Berkeley by
williamr@2:  * William Jolitz.
williamr@2:  *
williamr@2:  * Redistribution and use in source and binary forms, with or without
williamr@2:  * modification, are permitted provided that the following conditions
williamr@2:  * are met:
williamr@2:  * 1. Redistributions of source code must retain the above copyright
williamr@2:  *    notice, this list of conditions and the following disclaimer.
williamr@2:  * 2. Redistributions in binary form must reproduce the above copyright
williamr@2:  *    notice, this list of conditions and the following disclaimer in the
williamr@2:  *    documentation and/or other materials provided with the distribution.
williamr@2:  * 4. Neither the name of the University nor the names of its contributors
williamr@2:  *    may be used to endorse or promote products derived from this software
williamr@2:  *    without specific prior written permission.
williamr@2:  *
williamr@2:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
williamr@2:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
williamr@2:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
williamr@2:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
williamr@2:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
williamr@2:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
williamr@2:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
williamr@2:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
williamr@2:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
williamr@2:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
williamr@2:  * SUCH DAMAGE.
williamr@2:  *
williamr@2:  *	from: @(#)param.h	5.8 (Berkeley) 6/28/91
williamr@2:  * $FreeBSD: src/sys/i386/include/param.h,v 1.79 2004/11/20 02:29:49 das Exp $
williamr@2:  */
williamr@2: 
williamr@2: /*
williamr@2:  * Machine dependent constants for Intel 386.
williamr@2:  */
williamr@2: 
williamr@2: /*
williamr@2:  * Round p (pointer or byte index) up to a correctly-aligned value
williamr@2:  * for all data types (int, long, ...).   The result is unsigned int
williamr@2:  * and must be cast to any desired pointer type.
williamr@2:  */
williamr@2: 
williamr@2: #ifndef _ALIGNBYTES
williamr@2: #define _ALIGNBYTES	(sizeof(int) - 1)
williamr@2: #endif
williamr@2: #ifndef _ALIGN
williamr@2: #define _ALIGN(p)	(((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
williamr@2: #endif
williamr@2: 
williamr@2: #ifndef _MACHINE
williamr@2: #define	_MACHINE	i386
williamr@2: #endif
williamr@2: #ifndef _MACHINE_ARCH
williamr@2: #define	_MACHINE_ARCH	i386
williamr@2: #endif
williamr@2: 
williamr@2: #ifndef _NO_NAMESPACE_POLLUTION
williamr@2: 
williamr@2: #ifndef _MACHINE_PARAM_H_
williamr@2: #define	_MACHINE_PARAM_H_
williamr@2: 
williamr@2: #ifndef MACHINE
williamr@2: #define MACHINE		"i386"
williamr@2: #endif
williamr@2: #ifndef MACHINE_ARCH
williamr@2: #define	MACHINE_ARCH	"i386"
williamr@2: #endif
williamr@2: #define MID_MACHINE	MID_I386
williamr@2: 
williamr@2: #ifdef SMP
williamr@2: #define MAXCPU		16
williamr@2: #else
williamr@2: #define MAXCPU		1
williamr@2: #endif /* SMP */
williamr@2: 
williamr@2: #define ALIGNBYTES	_ALIGNBYTES
williamr@2: #define ALIGN(p)	_ALIGN(p)
williamr@2: 
williamr@2: #define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
williamr@2: #define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes/page */
williamr@2: #define PAGE_MASK	(PAGE_SIZE-1)
williamr@2: #define NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
williamr@2: 
williamr@2: #ifdef PAE
williamr@2: #define NPGPTD		4
williamr@2: #define PDRSHIFT	21		/* LOG2(NBPDR) */
williamr@2: #else
williamr@2: #define NPGPTD		1
williamr@2: #define PDRSHIFT	22		/* LOG2(NBPDR) */
williamr@2: #endif
williamr@2: 
williamr@2: #define NBPTD		(NPGPTD<<PAGE_SHIFT)
williamr@2: #define NPDEPTD		(NBPTD/(sizeof (pd_entry_t)))
williamr@2: #define NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))
williamr@2: #define NBPDR		(1<<PDRSHIFT)	/* bytes/page dir */
williamr@2: #define PDRMASK		(NBPDR-1)
williamr@2: 
williamr@2: #define IOPAGES	2		/* pages of i/o permission bitmap */
williamr@2: 
williamr@2: #ifndef KSTACK_PAGES
williamr@2: #define KSTACK_PAGES 2		/* Includes pcb! */
williamr@2: #endif
williamr@2: #define KSTACK_GUARD_PAGES 1	/* pages of kstack guard; 0 disables */
williamr@2: 
williamr@2: /*
williamr@2:  * Ceiling on amount of swblock kva space, can be changed via
williamr@2:  * the kern.maxswzone /boot/loader.conf variable.
williamr@2:  */
williamr@2: #ifndef VM_SWZONE_SIZE_MAX
williamr@2: #define VM_SWZONE_SIZE_MAX	(32 * 1024 * 1024)
williamr@2: #endif
williamr@2: 
williamr@2: /*
williamr@2:  * Ceiling on size of buffer cache (really only effects write queueing,
williamr@2:  * the VM page cache is not effected), can be changed via
williamr@2:  * the kern.maxbcache /boot/loader.conf variable.
williamr@2:  */
williamr@2: #ifndef VM_BCACHE_SIZE_MAX
williamr@2: #define VM_BCACHE_SIZE_MAX	(200 * 1024 * 1024)
williamr@2: #endif
williamr@2: 
williamr@2: /*
williamr@2:  * Mach derived conversion macros
williamr@2:  */
williamr@2: #define trunc_page(x)		((x) & ~PAGE_MASK)
williamr@2: #define round_page(x)		(((x) + PAGE_MASK) & ~PAGE_MASK)
williamr@2: #define trunc_4mpage(x)		((x) & ~PDRMASK)
williamr@2: #define round_4mpage(x)		((((x)) + PDRMASK) & ~PDRMASK)
williamr@2: 
williamr@2: #define atop(x)			((x) >> PAGE_SHIFT)
williamr@2: #define ptoa(x)			((x) << PAGE_SHIFT)
williamr@2: 
williamr@2: #define i386_btop(x)		((x) >> PAGE_SHIFT)
williamr@2: #define i386_ptob(x)		((x) << PAGE_SHIFT)
williamr@2: 
williamr@2: #define	pgtok(x)		((x) * (PAGE_SIZE / 1024))
williamr@2: 
williamr@2: #endif /* !_MACHINE_PARAM_H_ */
williamr@2: #endif /* !_NO_NAMESPACE_POLLUTION */