param.h revision 1.20
1/* $NetBSD: param.h,v 1.20 2010/02/08 19:02:31 joerg Exp $ */ 2 3/*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved. 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)param.h 5.8 (Berkeley) 6/28/91 36 */ 37 38/* 39 * SuperH dependent constants. 40 */ 41 42#ifndef _SH3_PARAM_H_ 43#define _SH3_PARAM_H_ 44 45#if defined(_KERNEL) && !defined(_LOCORE) 46#include <machine/cpu.h> 47#endif 48 49/* NetBSD/sh3 is 4KB page */ 50#define PGSHIFT 12 51#define NBPG (1 << PGSHIFT) 52#define PGOFSET (NBPG - 1) 53 54/* 55 * Round p (pointer or byte index) up to a correctly-aligned value 56 * for all data types (int, long, ...). The result is u_int and 57 * must be cast to any desired pointer type. 58 * 59 * ALIGNED_POINTER is a boolean macro that checks whether an address 60 * is valid to fetch data elements of type t from on this architecture. 61 * This does not reflect the optimal alignment, just the possibility 62 * (within reasonable limits). 63 * 64 */ 65#define ALIGNBYTES (sizeof(int) - 1) 66#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES) 67#define ALIGNED_POINTER(p, t) ((((u_long)(p)) & (sizeof(t) - 1)) == 0) 68 69#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 70#define DEV_BSIZE (1 << DEV_BSHIFT) 71#define BLKDEV_IOSIZE 2048 72#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 73 74/* 75 * u-space. 76 */ 77#define UPAGES 3 /* pages of u-area */ 78#define USPACE (UPAGES * NBPG) /* total size of u-area */ 79#if UPAGES == 1 80#error "too small u-area" 81#elif UPAGES == 2 82#define P1_STACK /* kernel stack is P1-area */ 83#else 84#undef P1_STACK /* kernel stack is P3-area */ 85#endif 86 87#ifndef MSGBUFSIZE 88#define MSGBUFSIZE NBPG /* default message buffer size */ 89#endif 90 91/* 92 * Constants related to network buffer management. 93 * MCLBYTES must be no larger than NBPG (the software page size), and, 94 * on machines that exchange pages of input or output buffers with mbuf 95 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 96 * of the hardware page size. 97 */ 98#define MSIZE 256 /* size of an mbuf */ 99 100#ifndef MCLSHIFT 101#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 102 /* 2K cluster can hold Ether frame */ 103#endif /* MCLSHIFT */ 104 105#define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 106 107/* 108 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 109 * logical pages. 110 */ 111#define NKMEMPAGES_MIN_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT) 112#define NKMEMPAGES_MAX_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT) 113 114#endif /* !_SH3_PARAM_H_ */ 115