1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. 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 * from: @(#)param.h 5.8 (Berkeley) 6/28/91 37 * $FreeBSD$ 38 */ 39 40 #ifndef _MACHINE_PARAM_H_ 41 #define _MACHINE_PARAM_H_ 42 43 /* 44 * Machine dependent constants for Intel 386. 45 */ 46 #ifndef _MACHINE 47 #define _MACHINE i386 48 #endif 49 #ifndef MACHINE 50 #define MACHINE "i386" 51 #endif 52 #ifndef _MACHINE_ARCH 53 #define _MACHINE_ARCH i386 54 #endif 55 #ifndef MACHINE_ARCH 56 #define MACHINE_ARCH "i386" 57 #endif 58 #define MID_MACHINE MID_I386 59 60 /* 61 * OBJFORMAT_NAMES is a comma-separated list of the object formats 62 * that are supported on the architecture. 63 */ 64 #define OBJFORMAT_NAMES "elf", "aout" 65 #define OBJFORMAT_DEFAULT "elf" 66 67 #ifdef SMP 68 #define MAXCPU 16 69 #else 70 #define MAXCPU 1 71 #endif /* SMP */ 72 73 /* 74 * Round p (pointer or byte index) up to a correctly-aligned value 75 * for all data types (int, long, ...). The result is unsigned int 76 * and must be cast to any desired pointer type. 77 */ 78 #define ALIGNBYTES (sizeof(int) - 1) 79 #define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) 80 81 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 82 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 83 #define PAGE_MASK (PAGE_SIZE-1) 84 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 85 86 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 87 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 88 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 89 #define PDRMASK (NBPDR-1) 90 91 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 92 #define DEV_BSIZE (1<<DEV_BSHIFT) 93 94 #ifndef BLKDEV_IOSIZE 95 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 96 #endif 97 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 98 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 99 100 #define IOPAGES 2 /* pages of i/o permission bitmap */ 101 #define UPAGES 2 /* pages of u-area */ 102 103 /* 104 * Constants related to network buffer management. 105 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 106 * on machines that exchange pages of input or output buffers with mbuf 107 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 108 * of the hardware page size. 109 */ 110 #ifndef MSIZE 111 #define MSIZE 256 /* size of an mbuf */ 112 #endif /* MSIZE */ 113 114 #ifndef MCLSHIFT 115 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 116 #endif /* MCLSHIFT */ 117 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 118 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 119 120 /* 121 * Some macros for units conversion 122 */ 123 124 /* clicks to bytes */ 125 #define ctob(x) ((x)<<PAGE_SHIFT) 126 127 /* bytes to clicks */ 128 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 129 130 /* 131 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 132 * want to shift an unsigned type to avoid sign extension and we don't 133 * want to widen `bytes' unnecessarily. Assume that the result fits in 134 * a daddr_t. 135 */ 136 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 137 (sizeof (bytes) > sizeof(long) \ 138 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 139 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 140 141 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 142 ((off_t)(db) << DEV_BSHIFT) 143 144 /* 145 * Mach derived conversion macros 146 */ 147 #define trunc_page(x) ((x) & ~PAGE_MASK) 148 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 149 #define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 150 #define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 151 152 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 153 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 154 155 #define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 156 #define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 157 158 #define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 159 160 #endif /* !_MACHINE_PARAM_H_ */ 161