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 1.20 1996/05/02 14:20:02 phk 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 /* 51 * Round p (pointer or byte index) up to a correctly-aligned value 52 * for all data types (int, long, ...). The result is unsigned int 53 * and must be cast to any desired pointer type. 54 */ 55 #define ALIGNBYTES (sizeof(int) - 1) 56 #define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) 57 58 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 59 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 60 #define PAGE_MASK (PAGE_SIZE-1) 61 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 62 63 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 64 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 65 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 66 67 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 68 #define DEV_BSIZE (1<<DEV_BSHIFT) 69 70 #define BLKDEV_IOSIZE 2048 71 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 72 73 #define UPAGES 2 /* pages of u-area */ 74 75 /* 76 * Constants related to network buffer management. 77 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 78 * on machines that exchange pages of input or output buffers with mbuf 79 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 80 * of the hardware page size. 81 */ 82 #ifndef MSIZE 83 #define MSIZE 128 /* size of an mbuf */ 84 #endif /* MSIZE */ 85 86 #ifndef MCLSHIFT 87 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 88 #endif /* MCLSHIFT */ 89 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 90 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 91 92 /* 93 * Some macros for units conversion 94 */ 95 /* Core clicks (4096 bytes) to segments and vice versa */ 96 #define ctos(x) (x) 97 #define stoc(x) (x) 98 99 /* Core clicks (4096 bytes) to disk blocks */ 100 #define ctod(x) ((x)<<(PAGE_SHIFT-DEV_BSHIFT)) 101 #define dtoc(x) ((x)>>(PAGE_SHIFT-DEV_BSHIFT)) 102 #define dtob(x) ((x)<<DEV_BSHIFT) 103 104 /* clicks to bytes */ 105 #define ctob(x) ((x)<<PAGE_SHIFT) 106 107 /* bytes to clicks */ 108 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 109 110 /* 111 * This is messy and perhaps slow because `bytes' may be an off_t. We 112 * have to shift an unsigned type to avoid sign extension and we don't 113 * want to widen `bytes' unnecessarily. Assume that off_t is long long 114 * and daddr_t is unsigned long. 115 */ 116 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 117 (sizeof (bytes) > sizeof(long) \ 118 ? (unsigned long)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 119 : (unsigned long)((unsigned long)(bytes) >> DEV_BSHIFT)) 120 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 121 ((unsigned long long)(db) << DEV_BSHIFT) 122 123 /* 124 * Mach derived conversion macros 125 */ 126 #define trunc_page(x) ((unsigned)(x) & ~PAGE_MASK) 127 #define round_page(x) ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK) 128 129 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 130 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 131 132 #define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 133 #define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 134 #define i386_round_page(x) ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK) 135 #define i386_trunc_page(x) ((unsigned)(x) & ~PAGE_MASK) 136 #define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 137 #define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 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