1/* $NetBSD: param.h,v 1.84 2019/01/07 22:00:31 jdolecek 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/*
41 * Machine dependent constants for Intel 386.
42 */
43
44/*
45 * MAXCPUS must be defined before cpu.h inclusion. Note: i386 might
46 * support more CPUs, but due to the limited KVA space available on
47 * i386, such support would be inefficient. Use amd64 instead.
48 */
49#define MAXCPUS 32
50
51#ifdef _KERNEL
52#include <machine/cpu.h>
53#endif
54
55#define _MACHINE i386
56#define MACHINE "i386"
57#define _MACHINE_ARCH i386
58#define MACHINE_ARCH "i386"
59#define MID_MACHINE MID_I386
60
61#define ALIGNED_POINTER(p,t) 1
62
63#define PGSHIFT 12 /* LOG2(NBPG) */
64#define NBPG (1 << PGSHIFT) /* bytes/page */
65#define PGOFSET (NBPG-1) /* byte offset into page */
66#define NPTEPG (NBPG/(sizeof (pt_entry_t)))
67
68#define MAXIOMEM 0xffffffff
69
70/*
71 * Maximum physical memory supported by the implementation.
72 */
73#ifdef PAE
74#define MAXPHYSMEM 0x1000000000ULL /* 64GB */
75#else
76#define MAXPHYSMEM 0x100000000ULL /* 4GB */
77#endif
78
79#if defined(_KERNEL_OPT)
80#include "opt_kernbase.h"
81#endif /* defined(_KERNEL_OPT) */
82
83#ifndef KERNBASE
84#define KERNBASE 0xc0000000UL /* start of kernel virtual space */
85#endif
86
87#define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */
88#define BTOPKERNBASE (KERNBASE >> PGSHIFT)
89
90#define SSIZE 1 /* initial stack size/NBPG */
91#define SINCR 1 /* increment of stack/NBPG */
92
93#ifndef UPAGES
94# ifdef DIAGNOSTIC
95# define UPAGES 3 /* 2 + 1 page for redzone */
96# else
97# define UPAGES 2 /* normal pages of u-area */
98# endif /* DIAGNOSTIC */
99#endif /* !defined(UPAGES) */
100#define USPACE (UPAGES * NBPG) /* total size of u-area */
101#define INTRSTACKSIZE 8192
102
103#ifndef MSGBUFSIZE
104#define MSGBUFSIZE (16*NBPG) /* default message buffer size */
105#endif
106
107/*
108 * Constants related to network buffer management.
109 * MCLBYTES must be no larger than NBPG (the software page size), and,
110 * on machines that exchange pages of input or output buffers with mbuf
111 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
112 * of the hardware page size.
113 */
114#define MSIZE 256 /* size of an mbuf */
115
116#ifndef MCLSHIFT
117#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
118 /* 2K cluster can hold Ether frame */
119#endif /* MCLSHIFT */
120
121#define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */
122
123#ifndef NMBCLUSTERS_MAX
124#define NMBCLUSTERS_MAX (0x4000000 / MCLBYTES) /* Limit to 64MB for clusters */
125#endif
126
127#ifndef NFS_RSIZE
128#define NFS_RSIZE 32768
129#endif
130#ifndef NFS_WSIZE
131#define NFS_WSIZE 32768
132#endif
133
134/*
135 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
136 * logical pages.
137 */
138#define NKMEMPAGES_MIN_DEFAULT ((16 * 1024 * 1024) >> PAGE_SHIFT)
139#define NKMEMPAGES_MAX_DEFAULT ((360 * 1024 * 1024) >> PAGE_SHIFT)
140
141/*
142 * Mach derived conversion macros
143 */
144#define x86_round_pdr(x) \
145 ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
146#define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1))
147#define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT)
148#define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT)
149#define x86_round_page(x) ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET)
150#define x86_trunc_page(x) ((paddr_t)(x) & ~PGOFSET)
151#define x86_btop(x) ((paddr_t)(x) >> PGSHIFT)
152#define x86_ptob(x) ((paddr_t)(x) << PGSHIFT)
153
154#endif /* _I386_PARAM_H_ */
155