xref: /freebsd/sys/i386/include/param.h (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
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  * $FreeBSD$
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 #define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
78 #define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes/page */
79 #define PAGE_MASK	(PAGE_SIZE-1)
80 #define NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
81 
82 #ifdef PAE
83 #define NPGPTD		4
84 #define PDRSHIFT	21		/* LOG2(NBPDR) */
85 #define NPGPTD_SHIFT	9
86 #else
87 #define NPGPTD		1
88 #define PDRSHIFT	22		/* LOG2(NBPDR) */
89 #define NPGPTD_SHIFT	10
90 #endif
91 
92 #define NBPTD		(NPGPTD<<PAGE_SHIFT)
93 #define NPDEPTD		(NBPTD/(sizeof (pd_entry_t)))
94 #define NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))
95 #define NBPDR		(1<<PDRSHIFT)	/* bytes/page dir */
96 #define PDRMASK		(NBPDR-1)
97 
98 #define IOPAGES	2		/* pages of i/o permission bitmap */
99 
100 #ifndef KSTACK_PAGES
101 #define KSTACK_PAGES 2		/* Includes pcb! */
102 #endif
103 #define KSTACK_GUARD_PAGES 1	/* pages of kstack guard; 0 disables */
104 
105 /*
106  * Ceiling on amount of swblock kva space, can be changed via
107  * the kern.maxswzone /boot/loader.conf variable.
108  */
109 #ifndef VM_SWZONE_SIZE_MAX
110 #define VM_SWZONE_SIZE_MAX	(32 * 1024 * 1024)
111 #endif
112 
113 /*
114  * Ceiling on size of buffer cache (really only effects write queueing,
115  * the VM page cache is not effected), can be changed via
116  * the kern.maxbcache /boot/loader.conf variable.
117  */
118 #ifndef VM_BCACHE_SIZE_MAX
119 #define VM_BCACHE_SIZE_MAX	(200 * 1024 * 1024)
120 #endif
121 
122 /*
123  * Mach derived conversion macros
124  */
125 #define trunc_page(x)		((x) & ~PAGE_MASK)
126 #define round_page(x)		(((x) + PAGE_MASK) & ~PAGE_MASK)
127 #define trunc_4mpage(x)		((x) & ~PDRMASK)
128 #define round_4mpage(x)		((((x)) + PDRMASK) & ~PDRMASK)
129 
130 #define atop(x)			((x) >> PAGE_SHIFT)
131 #define ptoa(x)			((x) << PAGE_SHIFT)
132 
133 #define i386_btop(x)		((x) >> PAGE_SHIFT)
134 #define i386_ptob(x)		((x) << PAGE_SHIFT)
135 
136 #define	pgtok(x)		((x) * (PAGE_SIZE / 1024))
137 
138 #endif /* !_MACHINE_PARAM_H_ */
139 #endif /* !_NO_NAMESPACE_POLLUTION */
140