param.h revision 197316 
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 197316 2009-09-18 17:04:57Z alc $
34 */
35
36#include <machine/_align.h>
37
38#ifndef _I386_INCLUDE_PARAM_H_
39#define	_I386_INCLUDE_PARAM_H_
40
41/*
42 * Machine dependent constants for Intel 386.
43 */
44
45/*
46 * Round p (pointer or byte index) up to a correctly-aligned value
47 * for all data types (int, long, ...).   The result is unsigned int
48 * and must be cast to any desired pointer type.
49 */
50#ifndef _ALIGNBYTES
51#define _ALIGNBYTES	(sizeof(int) - 1)
52#endif
53#ifndef _ALIGN
54#define _ALIGN(p)	(((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
55#endif
56
57
58#define __HAVE_ACPI
59#define __PCI_REROUTE_INTERRUPT
60
61#ifndef MACHINE
62#define MACHINE		"i386"
63#endif
64#ifndef MACHINE_ARCH
65#define	MACHINE_ARCH	"i386"
66#endif
67#define MID_MACHINE	MID_I386
68
69#if defined(SMP) || defined(KLD_MODULE)
70#define MAXCPU		32
71#else
72#define MAXCPU		1
73#endif /* SMP || KLD_MODULE */
74
75#define ALIGNBYTES	_ALIGNBYTES
76#define ALIGN(p)	_ALIGN(p)
77/*
78 * ALIGNED_POINTER is a boolean macro that checks whether an address
79 * is valid to fetch data elements of type t from on this architecture.
80 * This does not reflect the optimal alignment, just the possibility
81 * (within reasonable limits).
82 */
83#define	ALIGNED_POINTER(p, t)	1
84
85/*
86 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
87 * architecture.  It should be used with appropriate caution.
88 */
89#define	CACHE_LINE_SHIFT	7
90#define	CACHE_LINE_SIZE		(1 << CACHE_LINE_SHIFT)
91
92#define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
93#define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes/page */
94#define PAGE_MASK	(PAGE_SIZE-1)
95#define NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
96
97#ifdef PAE
98#define NPGPTD		4
99#define PDRSHIFT	21		/* LOG2(NBPDR) */
100#define NPGPTD_SHIFT	9
101#else
102#define NPGPTD		1
103#define PDRSHIFT	22		/* LOG2(NBPDR) */
104#define NPGPTD_SHIFT	10
105#endif
106
107#define NBPTD		(NPGPTD<<PAGE_SHIFT)
108#define NPDEPTD		(NBPTD/(sizeof (pd_entry_t)))
109#define NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))
110#define NBPDR		(1<<PDRSHIFT)	/* bytes/page dir */
111#define PDRMASK		(NBPDR-1)
112
113#define	MAXPAGESIZES	2	/* maximum number of supported page sizes */
114
115#define IOPAGES	2		/* pages of i/o permission bitmap */
116
117#ifndef KSTACK_PAGES
118#define KSTACK_PAGES 2		/* Includes pcb! */
119#endif
120#define KSTACK_GUARD_PAGES 1	/* pages of kstack guard; 0 disables */
121
122/*
123 * Ceiling on amount of swblock kva space, can be changed via
124 * the kern.maxswzone /boot/loader.conf variable.
125 */
126#ifndef VM_SWZONE_SIZE_MAX
127#define VM_SWZONE_SIZE_MAX	(32 * 1024 * 1024)
128#endif
129
130/*
131 * Ceiling on size of buffer cache (really only effects write queueing,
132 * the VM page cache is not effected), can be changed via
133 * the kern.maxbcache /boot/loader.conf variable.
134 */
135#ifndef VM_BCACHE_SIZE_MAX
136#define VM_BCACHE_SIZE_MAX	(200 * 1024 * 1024)
137#endif
138
139/*
140 * Mach derived conversion macros
141 */
142#define trunc_page(x)		((x) & ~PAGE_MASK)
143#define round_page(x)		(((x) + PAGE_MASK) & ~PAGE_MASK)
144#define trunc_4mpage(x)		((x) & ~PDRMASK)
145#define round_4mpage(x)		((((x)) + PDRMASK) & ~PDRMASK)
146
147#define atop(x)			((x) >> PAGE_SHIFT)
148#define ptoa(x)			((x) << PAGE_SHIFT)
149
150#define i386_btop(x)		((x) >> PAGE_SHIFT)
151#define i386_ptob(x)		((x) << PAGE_SHIFT)
152
153#define	pgtok(x)		((x) * (PAGE_SIZE / 1024))
154
155#endif /* !_I386_INCLUDE_PARAM_H_ */
156