1 /* $OpenBSD: param.h,v 1.5 2008/05/04 21:18:00 martin Exp $ */ 2 /* $NetBSD: param.h,v 1.15 2006/08/28 13:43:35 yamt Exp $ */ 3 4 /*- 5 * Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved. 6 * Copyright (c) 1990 The Regents of the University of California. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * William Jolitz. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)param.h 5.8 (Berkeley) 6/28/91 37 */ 38 39 /* 40 * SuperH dependent constants. 41 */ 42 43 #ifndef _SH_PARAM_H_ 44 #define _SH_PARAM_H_ 45 46 #define _MACHINE_ARCH sh 47 #define MACHINE_ARCH "sh" 48 49 #ifndef MID_MACHINE 50 #define MID_MACHINE MID_SH3 51 #endif 52 53 #if defined(_KERNEL) && !defined(_LOCORE) 54 #include <sh/cpu.h> 55 #endif 56 57 /* 58 * We use 4K pages on the sh3/sh4. Override the PAGE_* definitions 59 * to be compile-time constants. 60 */ 61 #define PAGE_SHIFT 12 62 #define PAGE_SIZE (1 << PAGE_SHIFT) 63 #define PAGE_MASK (PAGE_SIZE - 1) 64 65 #define PGSHIFT PAGE_SHIFT 66 #define NBPG PAGE_SIZE 67 #define PGOFSET PAGE_MASK 68 69 /* 70 * Round p (pointer or byte index) up to a correctly-aligned value 71 * for all data types (int, long, ...). The result is u_int and 72 * must be cast to any desired pointer type. 73 * 74 * ALIGNED_POINTER is a boolean macro that checks whether an address 75 * is valid to fetch data elements of type t from on this architecture. 76 * This does not reflect the optimal alignment, just the possibility 77 * (within reasonable limits). 78 * 79 */ 80 #define ALIGNBYTES (sizeof(int) - 1) 81 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES) 82 #define ALIGNED_POINTER(p, t) ((((u_long)(p)) & (sizeof(t) - 1)) == 0) 83 84 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 85 #define DEV_BSIZE (1 << DEV_BSHIFT) 86 #define BLKDEV_IOSIZE 2048 87 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 88 89 /* 90 * u-space. 91 */ 92 #define UPAGES 3 /* pages of u-area */ 93 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 94 #define USPACE_ALIGN (0) 95 #if UPAGES == 1 96 #error "too small u-area" 97 #elif UPAGES == 2 98 #define P1_STACK /* kernel stack is P1-area */ 99 #else 100 #undef P1_STACK /* kernel stack is P3-area */ 101 #endif 102 103 #ifndef MSGBUFSIZE 104 #define MSGBUFSIZE NBPG /* default message buffer size */ 105 #endif 106 107 /* pages to disk blocks */ 108 #define ctod(x) ((x) << (PAGE_SHIFT - DEV_BSHIFT)) 109 #define dtoc(x) ((x) >> (PAGE_SHIFT - DEV_BSHIFT)) 110 111 /* bytes to disk blocks */ 112 #define btodb(x) ((x) >> DEV_BSHIFT) 113 #define dbtob(x) ((x) << DEV_BSHIFT) 114 115 /* 116 * Constants related to network buffer management. 117 */ 118 #define NMBCLUSTERS 4096 /* map size, max cluster allocation */ 119 120 /* 121 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 122 * logical pages. 123 */ 124 #define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT) 125 #define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT) 126 127 #endif /* !_SH3_PARAM_H_ */ 128