1 /* $NetBSD: param.h,v 1.7 1999/12/12 07:45:46 scottr 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 #define _MACHINE_ARCH m68k 51 #define MACHINE_ARCH "m68k" 52 #define MID_MACHINE MID_M68K 53 54 /* 55 * Round p (pointer or byte index) up to a correctly-aligned value for all 56 * data types (int, long, ...). The result is u_int and must be cast to 57 * 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 NBPG (1 << PGSHIFT) /* bytes/page */ 70 #define PGOFSET (NBPG-1) /* byte offset into page */ 71 72 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 73 74 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 75 #define DEV_BSIZE (1 << DEV_BSHIFT) 76 #define BLKDEV_IOSIZE 2048 77 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 78 79 #define SSIZE 1 /* initial stack size/NBPG */ 80 #define SINCR 1 /* increment of stack/NBPG */ 81 82 #define USPACE (UPAGES * NBPG) 83 84 #ifndef MSGBUFSIZE 85 #define MSGBUFSIZE NBPG /* default message buffer size */ 86 #endif 87 88 /* 89 * Constants related to network buffer management. 90 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 91 * on machines that exchange pages of input or output buffers with mbuf 92 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 93 * of the hardware page size. 94 */ 95 #define MSIZE 128 /* size of an mbuf */ 96 97 #ifndef MCLSHIFT 98 # define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 99 #endif /* MCLSHIFT */ 100 101 #define MCLBYTES (1 << MCLSHIFT) 102 #define MCLOFSET (MCLBYTES - 1) 103 #ifndef NMBCLUSTERS 104 105 #if defined(_KERNEL) && !defined(_LKM) 106 #include "opt_gateway.h" 107 #endif /* _KERNEL && ! _LKM */ 108 109 #ifdef GATEWAY 110 # define NMBCLUSTERS 512 /* map size, max cluster allocation */ 111 #else 112 # define NMBCLUSTERS 256 /* map size, max cluster allocation */ 113 #endif 114 #endif 115 116 /* pages ("clicks") to disk blocks */ 117 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 118 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 119 120 /* pages to bytes */ 121 #define ctob(x) ((x) << PGSHIFT) 122 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 123 124 /* bytes to disk blocks */ 125 #define btodb(x) ((x) >> DEV_BSHIFT) 126 #define dbtob(x) ((x) << DEV_BSHIFT) 127 128 /* 129 * Map a ``block device block'' to a file system block. 130 * This should be device dependent, and should use the bsize 131 * field from the disk label. 132 * For now though just use DEV_BSIZE. 133 */ 134 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 135 136 /* 137 * Mach-derived conversion macros 138 */ 139 #define m68k_round_seg(x) ((((unsigned)(x)) + SEGOFSET) & ~SEGOFSET) 140 #define m68k_trunc_seg(x) ((unsigned)(x) & ~SEGOFSET) 141 #define m68k_seg_offset(x) ((unsigned)(x) & SEGOFSET) 142 #define m68k_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 143 #define m68k_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 144 #define m68k_page_offset(x) ((unsigned)(x) & PGOFSET) 145 #define m68k_btop(x) ((unsigned)(x) >> PGSHIFT) 146 #define m68k_ptob(x) ((unsigned)(x) << PGSHIFT) 147 148 #endif /* !_M68K_PARAM_H_ */ 149