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 * $Id: param.h,v 1.43 1998/06/14 15:21:27 bde Exp $ 38 */ 39 40 #ifndef _MACHINE_PARAM_H_ 41 #define _MACHINE_PARAM_H_ 42 43 /* 44 * Machine dependent constants for Intel 386. 45 */ 46 47 #define MACHINE "i386" 48 #define MID_MACHINE MID_I386 49 50 #ifdef SMP 51 #define NCPUS 2 52 #else 53 #define NCPUS 1 54 #endif 55 56 /* 57 * Round p (pointer or byte index) up to a correctly-aligned value 58 * for all data types (int, long, ...). The result is unsigned int 59 * and must be cast to any desired pointer type. 60 */ 61 #define ALIGNBYTES (sizeof(int) - 1) 62 #define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) 63 64 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 65 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 66 #define PAGE_MASK (PAGE_SIZE-1) 67 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 68 69 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 70 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 71 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 72 #define PDRMASK (NBPDR-1) 73 74 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 75 #define DEV_BSIZE (1<<DEV_BSHIFT) 76 77 #define BLKDEV_IOSIZE 2048 78 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 79 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 80 81 #define IOPAGES 2 /* pages of i/o permission bitmap */ 82 #define UPAGES 2 /* pages of u-area */ 83 #define UPAGES_HOLE 2 /* pages of "hole" at top of user space where */ 84 /* the upages used to be. DO NOT CHANGE! */ 85 86 /* 87 * Constants related to network buffer management. 88 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 89 * on machines that exchange pages of input or output buffers with mbuf 90 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 91 * of the hardware page size. 92 */ 93 #ifndef MSIZE 94 #define MSIZE 128 /* size of an mbuf */ 95 #endif /* MSIZE */ 96 97 #ifndef MCLSHIFT 98 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 99 #endif /* MCLSHIFT */ 100 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 101 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 102 103 /* 104 * Some macros for units conversion 105 */ 106 107 /* clicks to bytes */ 108 #define ctob(x) ((x)<<PAGE_SHIFT) 109 110 /* bytes to clicks */ 111 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 112 113 /* 114 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 115 * want to shift an unsigned type to avoid sign extension and we don't 116 * want to widen `bytes' unnecessarily. Assume that the result fits in 117 * a daddr_t. 118 */ 119 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 120 (sizeof (bytes) > sizeof(long) \ 121 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 122 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 123 124 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 125 ((off_t)(db) << DEV_BSHIFT) 126 127 /* 128 * Mach derived conversion macros 129 */ 130 #define trunc_page(x) ((unsigned)(x) & ~PAGE_MASK) 131 #define round_page(x) ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK) 132 #define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 133 #define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 134 135 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 136 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 137 138 #define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 139 #define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 140 141 #endif /* !_MACHINE_PARAM_H_ */ 142