1 /* $NetBSD: param.h,v 1.11 2002/05/09 12:28:08 uch 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)param.h 5.8 (Berkeley) 6/28/91 40 */ 41 42 /* 43 * SuperH dependent constants. 44 */ 45 46 #ifndef _SH3_PARAM_H_ 47 #define _SH3_PARAM_H_ 48 49 #if defined(_KERNEL) && !defined(_LOCORE) 50 #include <sh3/cpu.h> 51 #endif 52 53 /* NetBSD/sh3 is 4KB page */ 54 #define PGSHIFT 12 55 #define NBPG (1 << PGSHIFT) 56 #define PGOFSET (NBPG - 1) 57 58 /* 59 * Round p (pointer or byte index) up to a correctly-aligned value 60 * for all data types (int, long, ...). The result is u_int and 61 * must be cast to any desired pointer type. 62 * 63 * ALIGNED_POINTER is a boolean macro that checks whether an address 64 * is valid to fetch data elements of type t from on this architecture. 65 * This does not reflect the optimal alignment, just the possibility 66 * (within reasonable limits). 67 * 68 */ 69 #define ALIGNBYTES (sizeof(int) - 1) 70 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES) 71 #define ALIGNED_POINTER(p, t) ((((u_long)(p)) & (sizeof(t) - 1)) == 0) 72 73 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 74 #define DEV_BSIZE (1 << DEV_BSHIFT) 75 #define BLKDEV_IOSIZE 2048 76 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 77 78 /* 79 * u-space. 80 */ 81 #define UPAGES 3 /* pages of u-area */ 82 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 83 #if UPAGES == 1 84 #error "too small u-area" 85 #elif UPAGES == 2 86 #define P1_STACK /* kernel stack is P1-area */ 87 #else 88 #undef P1_STACK /* kernel stack is P3-area */ 89 #endif 90 91 #ifndef MSGBUFSIZE 92 #define MSGBUFSIZE NBPG /* default message buffer size */ 93 #endif 94 95 /* 96 * Constants related to network buffer management. 97 * MCLBYTES must be no larger than NBPG (the software page size), and, 98 * on machines that exchange pages of input or output buffers with mbuf 99 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 100 * of the hardware page size. 101 */ 102 #define MSIZE 256 /* size of an mbuf */ 103 104 #ifndef MCLSHIFT 105 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 106 /* 2K cluster can hold Ether frame */ 107 #endif /* MCLSHIFT */ 108 109 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 110 111 #ifndef NMBCLUSTERS 112 #if defined(_KERNEL_OPT) 113 #include "opt_gateway.h" 114 #endif 115 116 #ifdef GATEWAY 117 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 118 #else 119 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 120 #endif 121 #endif 122 123 /* 124 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 125 * logical pages. 126 */ 127 #define NKMEMPAGES_MIN_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT) 128 #define NKMEMPAGES_MAX_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT) 129 130 /* pages ("clicks") to disk blocks */ 131 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 132 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 133 134 /* bytes to pages */ 135 #define ctob(x) ((x) << PGSHIFT) 136 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 137 138 /* bytes to disk blocks */ 139 #define dbtob(x) ((x) << DEV_BSHIFT) 140 #define btodb(x) ((x) >> DEV_BSHIFT) 141 #endif /* !_SH3_PARAM_H_ */ 142