param.h revision 249722 
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 249722 2013-04-21 11:12:44Z tijl $
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#define ALIGNBYTES	_ALIGNBYTES
68#define ALIGN(p)	_ALIGN(p)
69/*
70 * ALIGNED_POINTER is a boolean macro that checks whether an address
71 * is valid to fetch data elements of type t from on this architecture.
72 * This does not reflect the optimal alignment, just the possibility
73 * (within reasonable limits).
74 */
75#define	ALIGNED_POINTER(p, t)	1
76
77/*
78 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
79 * architecture.  It should be used with appropriate caution.
80 */
81#define	CACHE_LINE_SHIFT	7
82#define	CACHE_LINE_SIZE		(1 << CACHE_LINE_SHIFT)
83
84#define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
85#define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes/page */
86#define PAGE_MASK	(PAGE_SIZE-1)
87#define NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
88
89#ifdef PAE
90#define NPGPTD		4
91#define PDRSHIFT	21		/* LOG2(NBPDR) */
92#define NPGPTD_SHIFT	9
93#else
94#define NPGPTD		1
95#define PDRSHIFT	22		/* LOG2(NBPDR) */
96#define NPGPTD_SHIFT	10
97#endif
98
99#define NBPTD		(NPGPTD<<PAGE_SHIFT)
100#define NPDEPTD		(NBPTD/(sizeof (pd_entry_t)))
101#define NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))
102#define NBPDR		(1<<PDRSHIFT)	/* bytes/page dir */
103#define PDRMASK		(NBPDR-1)
104
105#define	MAXPAGESIZES	2	/* maximum number of supported page sizes */
106
107#define IOPAGES	2		/* pages of i/o permission bitmap */
108
109#ifndef KSTACK_PAGES
110#define KSTACK_PAGES 2		/* Includes pcb! */
111#endif
112#define KSTACK_GUARD_PAGES 1	/* pages of kstack guard; 0 disables */
113
114/*
115 * Ceiling on amount of swblock kva space, can be changed via
116 * the kern.maxswzone /boot/loader.conf variable.
117 *
118 * 276 is sizeof(struct swblock), but we do not always have a definition
119 * in scope for struct swblock, so we have to hardcode it.  Each struct
120 * swblock holds metadata for 32 pages, so in theory, this is enough for
121 * 16 GB of swap.  In practice, however, the usable amount is considerably
122 * lower due to fragmentation.
123 */
124#ifndef VM_SWZONE_SIZE_MAX
125#define VM_SWZONE_SIZE_MAX	(276 * 128 * 1024)
126#endif
127
128/*
129 * Ceiling on size of buffer cache (really only effects write queueing,
130 * the VM page cache is not effected), can be changed via
131 * the kern.maxbcache /boot/loader.conf variable.
132 *
133 * The value is equal to the size of the auto-tuned buffer map for
134 * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc().
135 */
136#ifndef VM_BCACHE_SIZE_MAX
137#define VM_BCACHE_SIZE_MAX	(7224 * 16 * 1024)
138#endif
139
140/*
141 * Mach derived conversion macros
142 */
143#define trunc_page(x)		((x) & ~PAGE_MASK)
144#define round_page(x)		(((x) + PAGE_MASK) & ~PAGE_MASK)
145#define trunc_4mpage(x)		((x) & ~PDRMASK)
146#define round_4mpage(x)		((((x)) + PDRMASK) & ~PDRMASK)
147
148#define atop(x)			((x) >> PAGE_SHIFT)
149#define ptoa(x)			((x) << PAGE_SHIFT)
150
151#define i386_btop(x)		((x) >> PAGE_SHIFT)
152#define i386_ptob(x)		((x) << PAGE_SHIFT)
153
154#define	pgtok(x)		((x) * (PAGE_SIZE / 1024))
155
156#endif /* !_I386_INCLUDE_PARAM_H_ */
157