1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
35 * $FreeBSD: head/sys/i386/include/param.h 343567 2019-01-30 02:07:13Z kib $
36 */
37
38
39 #ifndef _I386_INCLUDE_PARAM_H_
40 #define _I386_INCLUDE_PARAM_H_
41
42 #include <machine/_align.h>
43
44 /*
45 * Machine dependent constants for Intel 386.
46 */
47
48
49 #define __HAVE_ACPI
50 #define __HAVE_PIR
51 #define __PCI_REROUTE_INTERRUPT
52
53 #ifndef MACHINE
54 #define MACHINE "i386"
55 #endif
56 #ifndef MACHINE_ARCH
57 #define MACHINE_ARCH "i386"
58 #endif
59 #define MID_MACHINE MID_I386
60
61 #if defined(SMP) || defined(KLD_MODULE)
62 #ifndef MAXCPU
63 #define MAXCPU 32
64 #endif
65 #else
66 #define MAXCPU 1
67 #endif /* SMP || KLD_MODULE */
68
69 #ifndef MAXMEMDOM
70 #define MAXMEMDOM 1
71 #endif
72
73 #define ALIGNBYTES _ALIGNBYTES
74 #define ALIGN(p) _ALIGN(p)
75 /*
76 * ALIGNED_POINTER is a boolean macro that checks whether an address
77 * is valid to fetch data elements of type t from on this architecture.
78 * This does not reflect the optimal alignment, just the possibility
79 * (within reasonable limits).
80 */
81 #define ALIGNED_POINTER(p, t) 1
82
83 /*
84 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
85 * architecture. It should be used with appropriate caution.
86 */
87 #define CACHE_LINE_SHIFT 6
88 #define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT)
89
90 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
91 #define PAGE_SIZE (1 << PAGE_SHIFT) /* bytes/page */
92 #define PAGE_MASK (PAGE_SIZE - 1)
93 #define NPTEPG (PAGE_SIZE / sizeof(pt_entry_t))
94
95 /* Size in bytes of the page directory */
96 #define NBPTD (NPGPTD << PAGE_SHIFT)
97 /* Number of PDEs in page directory, 2048 for PAE, 1024 for non-PAE */
98 #define NPDEPTD (NBPTD / sizeof(pd_entry_t))
99 /* Number of PDEs in one page of the page directory, 512 vs. 1024 */
100 #define NPDEPG (PAGE_SIZE / sizeof(pd_entry_t))
101 #define PDRMASK (NBPDR - 1)
102 #ifndef PDRSHIFT
103 #define PDRSHIFT i386_pmap_PDRSHIFT
104 #endif
105 #ifndef NBPDR
106 #define NBPDR (1 << PDRSHIFT) /* bytes/page dir */
107 #endif
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 4 /* 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) (TRUE)
166
167 #endif /* !_I386_INCLUDE_PARAM_H_ */
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