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
35#ifndef _I386_INCLUDE_PARAM_H_
36#define _I386_INCLUDE_PARAM_H_
37
38#include <machine/_align.h>
39
40/*
41 * Machine dependent constants for Intel 386.
42 */
43
44#define __HAVE_PIR
45
46#ifndef MACHINE
47#define MACHINE "i386"
48#endif
49#ifndef MACHINE_ARCH
50#define MACHINE_ARCH "i386"
51#endif
52#define MID_MACHINE MID_I386
53
54#ifdef SMP
55#ifndef MAXCPU
56#define MAXCPU 32
57#endif
58#else
59#define MAXCPU 1
60#endif
61
62#ifndef MAXMEMDOM
63#define MAXMEMDOM 1
64#endif
65
66#define ALIGNBYTES _ALIGNBYTES
67#define ALIGN(p) _ALIGN(p)
68/*
69 * ALIGNED_POINTER is a boolean macro that checks whether an address
70 * is valid to fetch data elements of type t from on this architecture.
71 * This does not reflect the optimal alignment, just the possibility
72 * (within reasonable limits).
73 */
74#define ALIGNED_POINTER(p, t) 1
75
76/*
77 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
78 * architecture. It should be used with appropriate caution.
79 */
80#define CACHE_LINE_SHIFT 6
81#define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT)
82
83#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
84#define PAGE_SIZE (1 << PAGE_SHIFT) /* bytes/page */
85#define PAGE_MASK (PAGE_SIZE - 1)
86#define NPTEPG (PAGE_SIZE / sizeof(pt_entry_t))
87
88/* Size in bytes of the page directory */
89#define NBPTD (NPGPTD << PAGE_SHIFT)
90/* Number of PDEs in page directory, 2048 for PAE, 1024 for non-PAE */
91#define NPDEPTD (NBPTD / sizeof(pd_entry_t))
92/* Number of PDEs in one page of the page directory, 512 vs. 1024 */
93#define NPDEPG (PAGE_SIZE / sizeof(pd_entry_t))
94#define PDRMASK (NBPDR - 1)
95#ifndef PDRSHIFT
96#define PDRSHIFT i386_pmap_PDRSHIFT
97#endif
98#ifndef NBPDR
99#define NBPDR (1 << PDRSHIFT) /* bytes/page dir */
100#endif
101
102#define MAXPAGESIZES 2 /* maximum number of supported page sizes */
103
104#define IOPAGES 2 /* pages of i/o permission bitmap */
105
106#ifndef KSTACK_PAGES
107#define KSTACK_PAGES 4 /* Includes pcb! */
108#endif
109#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */
110#if KSTACK_PAGES < 4
111#define TD0_KSTACK_PAGES 4
112#else
113#define TD0_KSTACK_PAGES KSTACK_PAGES
114#endif
115
116/*
117 * Ceiling on amount of swblock kva space, can be changed via
118 * the kern.maxswzone /boot/loader.conf variable.
119 *
120 * 276 is sizeof(struct swblock), but we do not always have a definition
121 * in scope for struct swblock, so we have to hardcode it. Each struct
122 * swblock holds metadata for 32 pages, so in theory, this is enough for
123 * 16 GB of swap. In practice, however, the usable amount is considerably
124 * lower due to fragmentation.
125 */
126#ifndef VM_SWZONE_SIZE_MAX
127#define VM_SWZONE_SIZE_MAX (276 * 128 * 1024)
128#endif
129
130/*
131 * Ceiling on size of buffer cache (really only effects write queueing,
132 * the VM page cache is not effected), can be changed via
133 * the kern.maxbcache /boot/loader.conf variable.
134 *
135 * The value is equal to the size of the auto-tuned buffer map for
136 * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc().
137 */
138#ifndef VM_BCACHE_SIZE_MAX
139#define VM_BCACHE_SIZE_MAX (7224 * 16 * 1024)
140#endif
141
142/*
143 * Mach derived conversion macros
144 */
145#define trunc_4mpage(x) ((x) & ~PDRMASK)
146#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
147
148#define i386_btop(x) ((x) >> PAGE_SHIFT)
149#define i386_ptob(x) ((x) << PAGE_SHIFT)
150
151#define INKERNEL(va) (TRUE)
152
153#endif /* !_I386_INCLUDE_PARAM_H_ */