1 /* $NetBSD: param.h,v 1.11 2002/02/26 15:13:23 simonb Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1986, 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 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: Utah $Hdr: machparam.h 1.16 92/12/20$ 41 * 42 * @(#)param.h 8.1 (Berkeley) 6/10/93 43 */ 44 #ifndef _M68K_PARAM_H_ 45 #define _M68K_PARAM_H_ 46 47 /* 48 * Machine independent constants for m68k 49 */ 50 #ifndef MACHINE_ARCH 51 #define _MACHINE_ARCH m68k 52 #define MACHINE_ARCH "m68k" 53 #endif 54 #ifndef MID_MACHINE 55 #define MID_MACHINE MID_M68K 56 #endif 57 58 /* 59 * Round p (pointer or byte index) up to a correctly-aligned value for all 60 * data types (int, long, ...). The result is u_int and must be cast to 61 * 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 NBPG (1 << PGSHIFT) /* bytes/page */ 74 #define PGOFSET (NBPG-1) /* byte offset into page */ 75 76 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 77 78 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 79 #define DEV_BSIZE (1 << DEV_BSHIFT) 80 #define BLKDEV_IOSIZE 2048 81 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 82 83 #define SSIZE 1 /* initial stack size/NBPG */ 84 #define SINCR 1 /* increment of stack/NBPG */ 85 86 #define USPACE (UPAGES * NBPG) 87 88 #ifndef MSGBUFSIZE 89 #define MSGBUFSIZE NBPG /* default message buffer size */ 90 #endif 91 92 /* 93 * Constants related to network buffer management. 94 * MCLBYTES must be no larger than NBPG (the software page size), and, 95 * on machines that exchange pages of input or output buffers with mbuf 96 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 97 * of the hardware page size. 98 */ 99 #define MSIZE 256 /* size of an mbuf */ 100 101 #ifndef MCLSHIFT 102 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 103 /* 2K cluster can hold Ether frame */ 104 #endif /* MCLSHIFT */ 105 106 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 107 108 #ifndef NMBCLUSTERS 109 #if defined(_KERNEL_OPT) 110 #include "opt_gateway.h" 111 #endif 112 113 #ifdef GATEWAY 114 # define NMBCLUSTERS 512 /* map size, max cluster allocation */ 115 #else 116 # define NMBCLUSTERS 256 /* map size, max cluster allocation */ 117 #endif 118 #endif 119 120 /* pages ("clicks") to disk blocks */ 121 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 122 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 123 124 /* pages to bytes */ 125 #define ctob(x) ((x) << PGSHIFT) 126 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 127 128 /* bytes to disk blocks */ 129 #define btodb(x) ((x) >> DEV_BSHIFT) 130 #define dbtob(x) ((x) << DEV_BSHIFT) 131 132 /* 133 * Map a ``block device block'' to a file system block. 134 * This should be device dependent, and should use the bsize 135 * field from the disk label. 136 * For now though just use DEV_BSIZE. 137 */ 138 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 139 140 /* 141 * Mach-derived conversion macros 142 */ 143 #define m68k_round_seg(x) ((((unsigned)(x)) + SEGOFSET) & ~SEGOFSET) 144 #define m68k_trunc_seg(x) ((unsigned)(x) & ~SEGOFSET) 145 #define m68k_seg_offset(x) ((unsigned)(x) & SEGOFSET) 146 #define m68k_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 147 #define m68k_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 148 #define m68k_page_offset(x) ((unsigned)(x) & PGOFSET) 149 #define m68k_btop(x) ((unsigned)(x) >> PGSHIFT) 150 #define m68k_ptob(x) ((unsigned)(x) << PGSHIFT) 151 152 #endif /* !_M68K_PARAM_H_ */ 153