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/* $OpenBSD: param.h,v 1.5 2008/05/04 21:18:00 martin Exp $ */
/* $NetBSD: param.h,v 1.15 2006/08/28 13:43:35 yamt Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved.
* 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
*/
/*
* SuperH dependent constants.
*/
#ifndef _SH_PARAM_H_
#define _SH_PARAM_H_
#define _MACHINE_ARCH sh
#define MACHINE_ARCH "sh"
#ifndef MID_MACHINE
#define MID_MACHINE MID_SH3
#endif
#if defined(_KERNEL) && !defined(_LOCORE)
#include <sh/cpu.h>
#endif
/*
* We use 4K pages on the sh3/sh4. Override the PAGE_* definitions
* to be compile-time constants.
*/
#define PAGE_SHIFT 12
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_MASK (PAGE_SIZE - 1)
#define PGSHIFT PAGE_SHIFT
#define NBPG PAGE_SIZE
#define PGOFSET PAGE_MASK
/*
* 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 DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
#define DEV_BSIZE (1 << DEV_BSHIFT)
#define BLKDEV_IOSIZE 2048
#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
/*
* u-space.
*/
#define UPAGES 3 /* pages of u-area */
#define USPACE (UPAGES * NBPG) /* total size of u-area */
#define USPACE_ALIGN (0)
#if UPAGES == 1
#error "too small u-area"
#elif UPAGES == 2
#define P1_STACK /* kernel stack is P1-area */
#else
#undef P1_STACK /* kernel stack is P3-area */
#endif
#ifndef MSGBUFSIZE
#define MSGBUFSIZE NBPG /* default message buffer size */
#endif
/* pages to disk blocks */
#define ctod(x) ((x) << (PAGE_SHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PAGE_SHIFT - DEV_BSHIFT))
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << DEV_BSHIFT)
/*
* Constants related to network buffer management.
*/
#define NMBCLUSTERS 4096 /* map size, max cluster allocation */
/*
* Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
* logical pages.
*/
#define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT)
#endif /* !_SH3_PARAM_H_ */
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