param.h revision 302408
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: stable/11/sys/i386/include/param.h 286288 2015-08-04 13:50:52Z kib $ 34 */ 35 36 37#ifndef _I386_INCLUDE_PARAM_H_ 38#define _I386_INCLUDE_PARAM_H_ 39 40#include <machine/_align.h> 41 42/* 43 * Machine dependent constants for Intel 386. 44 */ 45 46 47#define __HAVE_ACPI 48#define __HAVE_PIR 49#define __PCI_REROUTE_INTERRUPT 50 51#ifndef MACHINE 52#define MACHINE "i386" 53#endif 54#ifndef MACHINE_ARCH 55#define MACHINE_ARCH "i386" 56#endif 57#define MID_MACHINE MID_I386 58 59#if defined(SMP) || defined(KLD_MODULE) 60#ifndef MAXCPU 61#define MAXCPU 32 62#endif 63#else 64#define MAXCPU 1 65#endif /* SMP || KLD_MODULE */ 66 67#ifndef MAXMEMDOM 68#define MAXMEMDOM 1 69#endif 70 71#define ALIGNBYTES _ALIGNBYTES 72#define ALIGN(p) _ALIGN(p) 73/* 74 * ALIGNED_POINTER is a boolean macro that checks whether an address 75 * is valid to fetch data elements of type t from on this architecture. 76 * This does not reflect the optimal alignment, just the possibility 77 * (within reasonable limits). 78 */ 79#define ALIGNED_POINTER(p, t) 1 80 81/* 82 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an 83 * architecture. It should be used with appropriate caution. 84 */ 85#define CACHE_LINE_SHIFT 7 86#define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT) 87 88#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 89#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 90#define PAGE_MASK (PAGE_SIZE-1) 91#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 92 93#if defined(PAE) || defined(PAE_TABLES) 94#define NPGPTD 4 95#define PDRSHIFT 21 /* LOG2(NBPDR) */ 96#define NPGPTD_SHIFT 9 97#else 98#define NPGPTD 1 99#define PDRSHIFT 22 /* LOG2(NBPDR) */ 100#define NPGPTD_SHIFT 10 101#endif 102 103#define NBPTD (NPGPTD<<PAGE_SHIFT) 104#define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 105#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 106#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 107#define PDRMASK (NBPDR-1) 108 109#define MAXPAGESIZES 2 /* maximum number of supported page sizes */ 110 111#define IOPAGES 2 /* pages of i/o permission bitmap */ 112 113#ifndef KSTACK_PAGES 114#define KSTACK_PAGES 2 /* Includes pcb! */ 115#endif 116#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 117#if KSTACK_PAGES < 4 118#define TD0_KSTACK_PAGES 4 119#else 120#define TD0_KSTACK_PAGES KSTACK_PAGES 121#endif 122 123/* 124 * Ceiling on amount of swblock kva space, can be changed via 125 * the kern.maxswzone /boot/loader.conf variable. 126 * 127 * 276 is sizeof(struct swblock), but we do not always have a definition 128 * in scope for struct swblock, so we have to hardcode it. Each struct 129 * swblock holds metadata for 32 pages, so in theory, this is enough for 130 * 16 GB of swap. In practice, however, the usable amount is considerably 131 * lower due to fragmentation. 132 */ 133#ifndef VM_SWZONE_SIZE_MAX 134#define VM_SWZONE_SIZE_MAX (276 * 128 * 1024) 135#endif 136 137/* 138 * Ceiling on size of buffer cache (really only effects write queueing, 139 * the VM page cache is not effected), can be changed via 140 * the kern.maxbcache /boot/loader.conf variable. 141 * 142 * The value is equal to the size of the auto-tuned buffer map for 143 * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc(). 144 */ 145#ifndef VM_BCACHE_SIZE_MAX 146#define VM_BCACHE_SIZE_MAX (7224 * 16 * 1024) 147#endif 148 149/* 150 * Mach derived conversion macros 151 */ 152#define trunc_page(x) ((x) & ~PAGE_MASK) 153#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 154#define trunc_4mpage(x) ((x) & ~PDRMASK) 155#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 156 157#define atop(x) ((x) >> PAGE_SHIFT) 158#define ptoa(x) ((x) << PAGE_SHIFT) 159 160#define i386_btop(x) ((x) >> PAGE_SHIFT) 161#define i386_ptob(x) ((x) << PAGE_SHIFT) 162 163#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 164 165#define INKERNEL(va) (((vm_offset_t)(va)) >= VM_MAXUSER_ADDRESS && \ 166 ((vm_offset_t)(va)) < VM_MAX_KERNEL_ADDRESS) 167 168#endif /* !_I386_INCLUDE_PARAM_H_ */ 169