1/* $OpenBSD: vmparam.h,v 1.57 2021/03/16 18:04:16 kurt Exp $ */
2/* $NetBSD: vmparam.h,v 1.15 1994/10/27 04:16:34 cgd Exp $ */
3
4/*-
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * William Jolitz.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91
36 */
37
38#ifndef _MACHINE_VMPARAM_H_
39#define _MACHINE_VMPARAM_H_
40/*
41 * Machine dependent constants for 386.
42 */
43
44#define USRSTACK VM_MAXUSER_ADDRESS
45
46/*
47 * Virtual memory related constants, all in bytes
48 */
49#define MAXTSIZ (256*1024*1024) /* max text size */
50#ifndef DFLDSIZ
51#define DFLDSIZ (64*1024*1024) /* initial data size limit */
52#endif
53#ifndef MAXDSIZ
54#define MAXDSIZ (3UL*1024*1024*1024) /* max data size */
55#endif
56#ifndef BRKSIZ
57#define BRKSIZ (128*1024*1024) /* heap gap size */
58#endif
59#ifndef DFLSSIZ
60#define DFLSSIZ (4*1024*1024) /* initial stack size limit */
61#endif
62#ifndef MAXSSIZ
63#define MAXSSIZ (32*1024*1024) /* max stack size */
64#endif
65
66#define STACKGAP_RANDOM 256*1024
67
68/* I386 has a line where all code is executable: 0 - I386_MAX_EXE_ADDR */
69#define I386_MAX_EXE_ADDR 0x20000000 /* exec line */
70
71/* map PIE into 320MB - 448MB address range */
72#define VM_PIE_MIN_ADDR 0x14000000
73#define VM_PIE_MAX_ADDR 0x1C000000
74
75/*
76 * Size of shared memory map
77 */
78#ifndef SHMMAXPGS
79#define SHMMAXPGS 8192
80#endif
81
82/*
83 * Size of User Raw I/O map
84 */
85#define USRIOSIZE 300
86
87/*
88 * Specific addresses being unmapped and used as fillers for free memory.
89 */
90#define DEADBEEF0 0xefffeecc /* malloc's filler */
91#define DEADBEEF1 0xefffaabb /* pool's filler */
92
93/* user/kernel map constants */
94#define VM_MIN_ADDRESS ((vaddr_t)PAGE_SIZE)
95#define VM_MAXUSER_ADDRESS ((vaddr_t)((PDSLOT_PTE<<PDSHIFT) - (2 * PAGE_SIZE)))
96#define VM_MAX_ADDRESS ((vaddr_t)((PDSLOT_PTE<<PDSHIFT) + \
97 (PDSLOT_PTE<<PAGE_SHIFT)))
98#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)KERNBASE)
99#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(PDSLOT_APTE<<PDSHIFT))
100
101/* virtual sizes (bytes) for various kernel submaps */
102#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
103
104#define VM_PHYSSEG_MAX 16 /* actually we could have this many segments */
105#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
106#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
107
108#endif /* _MACHINE_VMPARAM_H_ */