param.h revision 195376
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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)param.h 5.8 (Berkeley) 6/28/91 33 * $FreeBSD: head/sys/i386/include/param.h 195376 2009-07-05 17:45:48Z sam $ 34 */ 35 36/* 37 * Machine dependent constants for Intel 386. 38 */ 39 40/* 41 * Round p (pointer or byte index) up to a correctly-aligned value 42 * for all data types (int, long, ...). The result is unsigned int 43 * and must be cast to any desired pointer type. 44 */ 45#ifndef _ALIGNBYTES 46#define _ALIGNBYTES (sizeof(int) - 1) 47#endif 48#ifndef _ALIGN 49#define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES) 50#endif 51 52#ifndef _NO_NAMESPACE_POLLUTION 53 54#define __HAVE_ACPI 55#define __PCI_REROUTE_INTERRUPT 56 57#ifndef _MACHINE_PARAM_H_ 58#define _MACHINE_PARAM_H_ 59 60#ifndef MACHINE 61#define MACHINE "i386" 62#endif 63#ifndef MACHINE_ARCH 64#define MACHINE_ARCH "i386" 65#endif 66#define MID_MACHINE MID_I386 67 68#if defined(SMP) || defined(KLD_MODULE) 69#define MAXCPU 32 70#else 71#define MAXCPU 1 72#endif /* SMP || KLD_MODULE */ 73 74#define ALIGNBYTES _ALIGNBYTES 75#define ALIGN(p) _ALIGN(p) 76/* 77 * ALIGNED_POINTER is a boolean macro that checks whether an address 78 * is valid to fetch data elements of type t from on this architecture. 79 * This does not reflect the optimal alignment, just the possibility 80 * (within reasonable limits). 81 */ 82#define ALIGNED_POINTER(p, t) 1 83 84/* 85 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an 86 * architecture. It should be used with appropriate caution. 87 */ 88#define CACHE_LINE_SHIFT 7 89#define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT) 90 91#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 92#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 93#define PAGE_MASK (PAGE_SIZE-1) 94#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 95 96#ifdef PAE 97#define NPGPTD 4 98#define PDRSHIFT 21 /* LOG2(NBPDR) */ 99#define NPGPTD_SHIFT 9 100#else 101#define NPGPTD 1 102#define PDRSHIFT 22 /* LOG2(NBPDR) */ 103#define NPGPTD_SHIFT 10 104#endif 105 106#define NBPTD (NPGPTD<<PAGE_SHIFT) 107#define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 108#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 109#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 110#define PDRMASK (NBPDR-1) 111 112#define IOPAGES 2 /* pages of i/o permission bitmap */ 113 114#ifndef KSTACK_PAGES 115#define KSTACK_PAGES 2 /* Includes pcb! */ 116#endif 117#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 118 119/* 120 * Ceiling on amount of swblock kva space, can be changed via 121 * the kern.maxswzone /boot/loader.conf variable. 122 */ 123#ifndef VM_SWZONE_SIZE_MAX 124#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024) 125#endif 126 127/* 128 * Ceiling on size of buffer cache (really only effects write queueing, 129 * the VM page cache is not effected), can be changed via 130 * the kern.maxbcache /boot/loader.conf variable. 131 */ 132#ifndef VM_BCACHE_SIZE_MAX 133#define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) 134#endif 135 136/* 137 * Mach derived conversion macros 138 */ 139#define trunc_page(x) ((x) & ~PAGE_MASK) 140#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 141#define trunc_4mpage(x) ((x) & ~PDRMASK) 142#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 143 144#define atop(x) ((x) >> PAGE_SHIFT) 145#define ptoa(x) ((x) << PAGE_SHIFT) 146 147#define i386_btop(x) ((x) >> PAGE_SHIFT) 148#define i386_ptob(x) ((x) << PAGE_SHIFT) 149 150#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 151 152#endif /* !_MACHINE_PARAM_H_ */ 153#endif /* !_NO_NAMESPACE_POLLUTION */ 154