1/* $NetBSD: vmparam.h,v 1.86 2019/02/11 14:59:32 cherry 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 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91
35 */
36
37#ifndef _I386_VMPARAM_H_
38#define _I386_VMPARAM_H_
39
40#include <sys/mutex.h>
41
42/*
43 * Machine dependent constants for 386.
44 */
45
46/*
47 * Page size on the IA-32 is not variable in the traditional sense.
48 * We override the PAGE_* definitions to compile-time constants.
49 */
50#define PAGE_SHIFT 12
51#define PAGE_SIZE (1 << PAGE_SHIFT)
52#define PAGE_MASK (PAGE_SIZE - 1)
53
54/*
55 * Virtual address space arrangement. On 386, both user and kernel
56 * share the address space, not unlike the vax.
57 * USRSTACK is the top (end) of the user stack. Immediately above the
58 * user stack is the page table map, and then kernel address space.
59 */
60#define USRSTACK VM_MAXUSER_ADDRESS
61
62/*
63 * Virtual memory related constants, all in bytes
64 */
65#define MAXTSIZ (256*1024*1024) /* max text size */
66#ifndef DFLDSIZ
67#define DFLDSIZ (256*1024*1024) /* initial data size limit */
68#endif
69#ifndef MAXDSIZ
70#define MAXDSIZ (3U*1024*1024*1024) /* 3G max data size */
71#endif
72#ifndef MAXDSIZ_BU
73#define MAXDSIZ_BU (2U*1024*1024*1024 + /* 2.5G max data size for */ \
74 1U* 512*1024*1024) /* bottom-up allocation */ \
75 /* could be a bit more */
76#endif
77#ifndef DFLSSIZ
78#define DFLSSIZ (2*1024*1024) /* initial stack size limit */
79#endif
80#ifndef MAXSSIZ
81#define MAXSSIZ (64*1024*1024) /* max stack size */
82#endif
83
84/*
85 * IA-32 can't do per-page execute permission, so instead we implement
86 * two executable segments for %cs, one that covers everything and one
87 * that excludes some of the address space (currently just the stack).
88 * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment.
89 */
90#define I386_MAX_EXE_ADDR (USRSTACK - MAXSSIZ)
91
92/*
93 * Size of User Raw I/O map
94 */
95#define USRIOSIZE 300
96
97/*
98 * Mach derived constants
99 */
100
101/* user/kernel map constants */
102#define VM_MIN_ADDRESS ((vaddr_t)0)
103#define VM_MAXUSER_ADDRESS ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT) - PAGE_SIZE)
104#define VM_MAX_ADDRESS \
105 ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT)))
106#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT))
107#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT))
108
109/*
110 * The address to which unspecified mapping requests default
111 */
112#ifdef _KERNEL_OPT
113#include "opt_uvm.h"
114#include "opt_xen.h"
115#endif
116#define __USE_TOPDOWN_VM
117#define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
118 round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU))
119
120/* virtual sizes (bytes) for various kernel submaps */
121#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
122
123#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
124
125#ifdef XENPV
126#define VM_PHYSSEG_MAX 1
127#define VM_NFREELIST 1
128#else
129#define VM_PHYSSEG_MAX 32 /* 1 "hole" + 31 free lists */
130#define VM_NFREELIST 4
131#define VM_FREELIST_FIRST16 3
132#define VM_FREELIST_FIRST1G 2
133#define VM_FREELIST_FIRST4G 1
134#endif /* XENPV */
135#define VM_FREELIST_DEFAULT 0
136
137#endif /* _I386_VMPARAM_H_ */
138