xref: /freebsd/sys/i386/include/param.h (revision 65b71c48d226f3ef3eb1c4452dccc678a7d2ac96)
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 #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