master
1/* $NetBSD: param.h,v 1.88 2021/05/31 14:38:55 simonb Exp $ */
2
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 * @(#)param.h 5.8 (Berkeley) 6/28/91
35 */
36
37#ifndef _I386_PARAM_H_
38#define _I386_PARAM_H_
39
40#ifdef _KERNEL_OPT
41#include "opt_param.h"
42#endif
43
44/*
45 * Machine dependent constants for Intel 386.
46 */
47
48/*
49 * MAXCPUS must be defined before cpu.h inclusion. Note: i386 might
50 * support more CPUs, but due to the limited KVA space available on
51 * i386, such support would be inefficient. Use amd64 instead.
52 */
53#define MAXCPUS 32
54
55#ifdef _KERNEL
56#include <machine/cpu.h>
57#endif
58
59#define _MACHINE i386
60#define MACHINE "i386"
61#define _MACHINE_ARCH i386
62#define MACHINE_ARCH "i386"
63#define MID_MACHINE MID_I386
64
65#define ALIGNED_POINTER(p,t) 1
66#define ALIGNED_POINTER_LOAD(q,p,t) memcpy((q), (p), sizeof(t))
67
68#define PGSHIFT 12 /* LOG2(NBPG) */
69#define NBPG (1 << PGSHIFT) /* bytes/page */
70#define PGOFSET (NBPG-1) /* byte offset into page */
71#define NPTEPG (NBPG/(sizeof (pt_entry_t)))
72
73#define MAXIOMEM 0xffffffff
74
75/*
76 * Maximum physical memory supported by the implementation.
77 */
78#ifdef PAE
79#define MAXPHYSMEM 0x1000000000ULL /* 64GB */
80#else
81#define MAXPHYSMEM 0x100000000ULL /* 4GB */
82#endif
83
84#if defined(_KERNEL_OPT)
85#include "opt_kernbase.h"
86#endif /* defined(_KERNEL_OPT) */
87
88#ifndef KERNBASE
89#define KERNBASE 0xc0000000UL /* start of kernel virtual space */
90#endif
91
92#define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */
93#define BTOPKERNBASE (KERNBASE >> PGSHIFT)
94
95#define SSIZE 1 /* initial stack size/NBPG */
96#define SINCR 1 /* increment of stack/NBPG */
97
98#ifndef UPAGES
99# ifdef DIAGNOSTIC
100# define UPAGES 3 /* 2 + 1 page for redzone */
101# else
102# define UPAGES 2 /* normal pages of u-area */
103# endif /* DIAGNOSTIC */
104#endif /* !defined(UPAGES) */
105#define USPACE (UPAGES * NBPG) /* total size of u-area */
106#define INTRSTACKSIZE 8192
107
108#ifndef MSGBUFSIZE
109#define MSGBUFSIZE (16*NBPG) /* default message buffer size */
110#endif
111
112/*
113 * Constants related to network buffer management.
114 * MCLBYTES must be no larger than NBPG (the software page size), and,
115 * on machines that exchange pages of input or output buffers with mbuf
116 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
117 * of the hardware page size.
118 */
119#define MSIZE 256 /* size of an mbuf */
120
121#ifndef MCLSHIFT
122#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
123 /* 2K cluster can hold Ether frame */
124#endif /* MCLSHIFT */
125
126#define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */
127
128#ifndef NMBCLUSTERS_MAX
129#define NMBCLUSTERS_MAX (0x4000000 / MCLBYTES) /* Limit to 64MB for clusters */
130#endif
131
132#ifndef NFS_RSIZE
133#define NFS_RSIZE 32768
134#endif
135#ifndef NFS_WSIZE
136#define NFS_WSIZE 32768
137#endif
138
139/*
140 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
141 * logical pages.
142 */
143#define NKMEMPAGES_MIN_DEFAULT ((16 * 1024 * 1024) >> PAGE_SHIFT)
144#define NKMEMPAGES_MAX_DEFAULT ((360 * 1024 * 1024) >> PAGE_SHIFT)
145
146/*
147 * Mach derived conversion macros
148 */
149#define x86_round_pdr(x) \
150 ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
151#define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1))
152#define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT)
153#define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT)
154#define x86_round_page(x) ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET)
155#define x86_trunc_page(x) ((paddr_t)(x) & ~PGOFSET)
156#define x86_btop(x) ((paddr_t)(x) >> PGSHIFT)
157#define x86_ptob(x) ((paddr_t)(x) << PGSHIFT)
158
159#endif /* _I386_PARAM_H_ */