param.h revision 15583
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 1.21 1996/05/02 22:25:17 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 96/* clicks to bytes */ 97#define ctob(x) ((x)<<PAGE_SHIFT) 98 99/* bytes to clicks */ 100#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 101 102/* 103 * This is messy and perhaps slow because `bytes' may be an off_t. We 104 * have to shift an unsigned type to avoid sign extension and we don't 105 * want to widen `bytes' unnecessarily. Assume that off_t is long long 106 * and daddr_t is unsigned long. 107 */ 108#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 109 (sizeof (bytes) > sizeof(long) \ 110 ? (unsigned long)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 111 : (unsigned long)((unsigned long)(bytes) >> DEV_BSHIFT)) 112#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 113 ((unsigned long long)(db) << DEV_BSHIFT) 114 115/* 116 * Mach derived conversion macros 117 */ 118#define trunc_page(x) ((unsigned)(x) & ~PAGE_MASK) 119#define round_page(x) ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK) 120 121#define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 122#define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 123 124#define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 125#define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 126 127#endif /* !_MACHINE_PARAM_H_ */ 128