text: /*	$NetBSD: param.h,v 1.61 2006/08/28 13:43:35 yamt 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. 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 _I386_PARAM_H_
  #define _I386_PARAM_H_
  
  /*
   * Machine dependent constants for Intel 386.
   */
  
  #ifdef _KERNEL
  #ifdef _LOCORE
  #include <machine/psl.h>
  #else
  #include <machine/cpu.h>
  #endif
  #endif
  
  #define	_MACHINE	i386
  #define	MACHINE		"i386"
  #define	_MACHINE_ARCH	i386
  #define	MACHINE_ARCH	"i386"
  #define	MID_MACHINE	MID_I386
  
  /*
   * 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)(u_long)(p) + ALIGNBYTES) &~ \
      ALIGNBYTES)
  #define ALIGNED_POINTER(p,t)	1
  
  #define	PGSHIFT		12		/* LOG2(NBPG) */
  #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
  #define	PGOFSET		(NBPG-1)	/* byte offset into page */
  #define	NPTEPG		(NBPG/(sizeof (pt_entry_t)))
  
  #if defined(_KERNEL_OPT)
  #include "opt_kernbase.h"
  #endif /* defined(_KERNEL_OPT) */
  
  #ifdef KERNBASE_LOCORE
  #error "You should only re-define KERNBASE"
  #endif
  
  #ifndef	KERNBASE
  #define	KERNBASE	0xc0000000UL	/* start of kernel virtual space */
  #endif
  
  #define	KERNTEXTOFF	(KERNBASE + 0x100000) /* start of kernel text */
  #define	BTOPKERNBASE	(KERNBASE >> PGSHIFT)
  
  #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
  #define	DEV_BSIZE	(1 << DEV_BSHIFT)
  #define	BLKDEV_IOSIZE	2048
  #ifndef	MAXPHYS
  #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
  #endif
  
  #define	SSIZE		1		/* initial stack size/NBPG */
  #define	SINCR		1		/* increment of stack/NBPG */
  
  #ifdef _KERNEL_OPT
  #include "opt_noredzone.h"
  #endif
  #ifndef UPAGES
  #ifdef NOREDZONE
  #define	UPAGES		2		/* pages of u-area */
  #else
  #define UPAGES		3
  #endif /*NOREDZONE */
  #endif /* !defined(UPAGES) */
  #define	USPACE		(UPAGES * NBPG)	/* total size of u-area */
  
  #ifndef MSGBUFSIZE
  #define MSGBUFSIZE	4*NBPG		/* default message buffer size */
  #endif
  
  /*
   * Constants related to network buffer management.
   * MCLBYTES must be no larger than NBPG (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		256		/* size of an mbuf */
  
  #ifndef MCLSHIFT
  #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
  					/* 2K cluster can hold Ether frame */
  #endif	/* MCLSHIFT */
  
  #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
  
  #ifndef NMBCLUSTERS
  #if defined(_KERNEL_OPT)
  #include "opt_gateway.h"
  #endif
  
  #ifdef GATEWAY
  #define	NMBCLUSTERS	2048		/* map size, max cluster allocation */
  #else
  #define	NMBCLUSTERS	1024		/* map size, max cluster allocation */
  #endif
  #endif
  
  #ifndef NFS_RSIZE
  #define NFS_RSIZE	32768
  #endif
  #ifndef NFS_WSIZE
  #define NFS_WSIZE	32768
  #endif
  
  /*
   * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
   * logical pages.
   */
  #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
  #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
  
  /*
   * Mach derived conversion macros
   */
  #define	x86_round_pdr(x)	((((unsigned)(x)) + PDOFSET) & ~PDOFSET)
  #define	x86_trunc_pdr(x)	((unsigned)(x) & ~PDOFSET)
  #define	x86_btod(x)		((unsigned)(x) >> PDSHIFT)
  #define	x86_dtob(x)		((unsigned)(x) << PDSHIFT)
  #define	x86_round_page(x)	((((unsigned)(x)) + PGOFSET) & ~PGOFSET)
  #define	x86_trunc_page(x)	((unsigned)(x) & ~PGOFSET)
  #define	x86_btop(x)		((unsigned)(x) >> PGSHIFT)
  #define	x86_ptob(x)		((unsigned)(x) << PGSHIFT)
  
  #endif /* _I386_PARAM_H_ */
  