1/* $NetBSD: vmparam.h,v 1.88 2022/08/21 13:15:15 riastradh 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#include <machine/pte.h>
43
44/*
45 * Machine dependent constants for 386.
46 */
47
48/*
49 * Page size on the IA-32 is not variable in the traditional sense.
50 * We override the PAGE_* definitions to compile-time constants.
51 */
52#define PAGE_SHIFT 12
53#define PAGE_SIZE (1 << PAGE_SHIFT)
54#define PAGE_MASK (PAGE_SIZE - 1)
55
56/*
57 * Virtual address space arrangement. On 386, both user and kernel
58 * share the address space, not unlike the vax.
59 * USRSTACK is the top (end) of the user stack. Immediately above the
60 * user stack is the page table map, and then kernel address space.
61 */
62#define USRSTACK VM_MAXUSER_ADDRESS
63
64/*
65 * Virtual memory related constants, all in bytes
66 */
67#define MAXTSIZ (256*1024*1024) /* max text size */
68#ifndef DFLDSIZ
69#define DFLDSIZ (256*1024*1024) /* initial data size limit */
70#endif
71#ifndef MAXDSIZ
72#define MAXDSIZ (3U*1024*1024*1024) /* 3G max data size */
73#endif
74#ifndef MAXDSIZ_BU
75#define MAXDSIZ_BU (2U*1024*1024*1024 + /* 2.5G max data size for */ \
76 1U* 512*1024*1024) /* bottom-up allocation */ \
77 /* could be a bit more */
78#endif
79#ifndef DFLSSIZ
80#define DFLSSIZ (2*1024*1024) /* initial stack size limit */
81#endif
82#ifndef MAXSSIZ
83#define MAXSSIZ (64*1024*1024) /* max stack size */
84#endif
85
86/*
87 * IA-32 can't do per-page execute permission, so instead we implement
88 * two executable segments for %cs, one that covers everything and one
89 * that excludes some of the address space (currently just the stack).
90 * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment.
91 */
92#define I386_MAX_EXE_ADDR (USRSTACK - MAXSSIZ)
93
94/*
95 * Size of User Raw I/O map
96 */
97#define USRIOSIZE 300
98
99/*
100 * See pmap_private.h for details.
101 */
102#ifdef PAE
103#define L2_SLOT_PTE (KERNBASE/NBPD_L2-4) /* 1532: for recursive PDP map */
104#define L2_SLOT_KERN (KERNBASE/NBPD_L2) /* 1536: start of kernel space */
105#else /* PAE */
106#define L2_SLOT_PTE (KERNBASE/NBPD_L2-1) /* 767: for recursive PDP map */
107#define L2_SLOT_KERN (KERNBASE/NBPD_L2) /* 768: start of kernel space */
108#endif /* PAE */
109
110#define L2_SLOT_KERNBASE L2_SLOT_KERN
111
112#define PDIR_SLOT_KERN L2_SLOT_KERN
113#define PDIR_SLOT_PTE L2_SLOT_PTE
114
115/* size of a PDP: usually one page, except for PAE */
116#ifdef PAE
117#define PDP_SIZE 4
118#else
119#define PDP_SIZE 1
120#endif
121
122/* largest value (-1 for APTP space) */
123#define NKL2_MAX_ENTRIES (NTOPLEVEL_PDES - (KERNBASE/NBPD_L2) - 1)
124#define NKL1_MAX_ENTRIES (unsigned long)(NKL2_MAX_ENTRIES * NPDPG)
125
126#define NKL2_KIMG_ENTRIES 0 /* XXX unused */
127
128#define NKL2_START_ENTRIES 0 /* XXX computed on runtime */
129#define NKL1_START_ENTRIES 0 /* XXX unused */
130
131#ifndef XENPV
132#define NTOPLEVEL_PDES (PAGE_SIZE * PDP_SIZE / (sizeof (pd_entry_t)))
133#else /* !XENPV */
134#ifdef PAE
135#define NTOPLEVEL_PDES 1964 /* 1964-2047 reserved by Xen */
136#else /* PAE */
137#define NTOPLEVEL_PDES 1008 /* 1008-1023 reserved by Xen */
138#endif /* PAE */
139#endif /* !XENPV */
140
141/*
142 * Mach derived constants
143 */
144
145/* user/kernel map constants */
146#define VM_MIN_ADDRESS ((vaddr_t)0)
147#define VM_MAXUSER_ADDRESS ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT) - PAGE_SIZE)
148#define VM_MAX_ADDRESS \
149 ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT)))
150#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT))
151#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT))
152
153/*
154 * The address to which unspecified mapping requests default
155 */
156#ifdef _KERNEL_OPT
157#include "opt_uvm.h"
158#include "opt_xen.h"
159#endif
160#define __USE_TOPDOWN_VM
161#define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
162 round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU))
163
164/* virtual sizes (bytes) for various kernel submaps */
165#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
166
167#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
168
169#ifdef XENPV
170#define VM_PHYSSEG_MAX 1
171#define VM_NFREELIST 1
172#else
173#define VM_PHYSSEG_MAX 32 /* 1 "hole" + 31 free lists */
174#define VM_NFREELIST 4
175#define VM_FREELIST_FIRST16 3
176#define VM_FREELIST_FIRST1G 2
177#define VM_FREELIST_FIRST4G 1
178#endif /* XENPV */
179#define VM_FREELIST_DEFAULT 0
180
181#endif /* _I386_VMPARAM_H_ */