param.h revision 223440 
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 223440 2011-06-22 21:04:13Z jhb $
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	__HAVE_PIR
60#define __PCI_REROUTE_INTERRUPT
61
62#ifndef MACHINE
63#define MACHINE		"i386"
64#endif
65#ifndef MACHINE_ARCH
66#define	MACHINE_ARCH	"i386"
67#endif
68#define MID_MACHINE	MID_I386
69
70#if defined(SMP) || defined(KLD_MODULE)
71#define MAXCPU		32
72#else
73#define MAXCPU		1
74#endif /* SMP || KLD_MODULE */
75
76#define ALIGNBYTES	_ALIGNBYTES
77#define ALIGN(p)	_ALIGN(p)
78/*
79 * ALIGNED_POINTER is a boolean macro that checks whether an address
80 * is valid to fetch data elements of type t from on this architecture.
81 * This does not reflect the optimal alignment, just the possibility
82 * (within reasonable limits).
83 */
84#define	ALIGNED_POINTER(p, t)	1
85
86/*
87 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
88 * architecture.  It should be used with appropriate caution.
89 */
90#define	CACHE_LINE_SHIFT	7
91#define	CACHE_LINE_SIZE		(1 << CACHE_LINE_SHIFT)
92
93#define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
94#define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes/page */
95#define PAGE_MASK	(PAGE_SIZE-1)
96#define NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
97
98#ifdef PAE
99#define NPGPTD		4
100#define PDRSHIFT	21		/* LOG2(NBPDR) */
101#define NPGPTD_SHIFT	9
102#else
103#define NPGPTD		1
104#define PDRSHIFT	22		/* LOG2(NBPDR) */
105#define NPGPTD_SHIFT	10
106#endif
107
108#define NBPTD		(NPGPTD<<PAGE_SHIFT)
109#define NPDEPTD		(NBPTD/(sizeof (pd_entry_t)))
110#define NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))
111#define NBPDR		(1<<PDRSHIFT)	/* bytes/page dir */
112#define PDRMASK		(NBPDR-1)
113
114#define	MAXPAGESIZES	2	/* maximum number of supported page sizes */
115
116#define IOPAGES	2		/* pages of i/o permission bitmap */
117
118#ifndef KSTACK_PAGES
119#define KSTACK_PAGES 2		/* Includes pcb! */
120#endif
121#define KSTACK_GUARD_PAGES 1	/* pages of kstack guard; 0 disables */
122
123/*
124 * Ceiling on amount of swblock kva space, can be changed via
125 * the kern.maxswzone /boot/loader.conf variable.
126 */
127#ifndef VM_SWZONE_SIZE_MAX
128#define VM_SWZONE_SIZE_MAX	(32 * 1024 * 1024)
129#endif
130
131/*
132 * Ceiling on size of buffer cache (really only effects write queueing,
133 * the VM page cache is not effected), can be changed via
134 * the kern.maxbcache /boot/loader.conf variable.
135 */
136#ifndef VM_BCACHE_SIZE_MAX
137#define VM_BCACHE_SIZE_MAX	(200 * 1024 * 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