master
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 * Copyright (c) 1994 John S. Dyson
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * William Jolitz.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
37 */
38
39#ifndef _MACHINE_VMPARAM_H_
40#define _MACHINE_VMPARAM_H_ 1
41
42/*
43 * Machine dependent constants for 386.
44 */
45
46/*
47 * Virtual memory related constants, all in bytes
48 */
49#define MAXTSIZ (128UL*1024*1024) /* max text size */
50#ifndef DFLDSIZ
51#define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
52#endif
53#ifndef MAXDSIZ
54#define MAXDSIZ (512UL*1024*1024) /* max data size */
55#endif
56#ifndef DFLSSIZ
57#define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
58#endif
59#ifndef MAXSSIZ
60#define MAXSSIZ (64UL*1024*1024) /* max stack size */
61#endif
62#ifndef SGROWSIZ
63#define SGROWSIZ (128UL*1024) /* amount to grow stack */
64#endif
65
66/*
67 * Choose between DENSE and SPARSE based on whether lower execution time or
68 * lower kernel address space consumption is desired. Under PAE, kernel
69 * address space is often in short supply.
70 */
71#ifdef PAE
72#define VM_PHYSSEG_SPARSE
73#else
74#define VM_PHYSSEG_DENSE
75#endif
76
77/*
78 * The number of PHYSSEG entries must be one greater than the number
79 * of phys_avail entries because the phys_avail entry that spans the
80 * largest physical address that is accessible by ISA DMA is split
81 * into two PHYSSEG entries.
82 */
83#define VM_PHYSSEG_MAX 17
84
85/*
86 * Create one free page pool. Since the i386 kernel virtual address
87 * space does not include a mapping onto the machine's entire physical
88 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
89 * pool, VM_FREEPOOL_DEFAULT.
90 */
91#define VM_NFREEPOOL 1
92#define VM_FREEPOOL_DEFAULT 0
93#define VM_FREEPOOL_DIRECT 0
94
95/*
96 * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages
97 * that have physical addresses below 4G but are not accessible by ISA DMA,
98 * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA
99 * DMA.
100 */
101#define VM_NFREELIST 3
102#define VM_FREELIST_DEFAULT 0
103#define VM_FREELIST_DMA32 1
104#define VM_FREELIST_LOWMEM 2
105
106#define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */
107
108/*
109 * Always create DMA32 freelist if there is any memory above 4G.
110 * Bounce dma is extremely fragile and simultaneously intensively
111 * used.
112 */
113#define VM_DMA32_NPAGES_THRESHOLD 1
114
115/*
116 * The largest allocation size is 2MB under PAE and 4MB otherwise.
117 */
118#define VM_NFREEORDER_PAE 10
119#define VM_NFREEORDER_NOPAE 11
120#define VM_NFREEORDER_MAX VM_NFREEORDER_NOPAE
121#define VM_NFREEORDER i386_pmap_VM_NFREEORDER
122
123/*
124 * Enable superpage reservations: 1 level.
125 */
126#ifndef VM_NRESERVLEVEL
127#define VM_NRESERVLEVEL 1
128#endif
129
130/*
131 * Level 0 reservations consist of 512 pages when PAE pagetables are
132 * used, and 1024 pages otherwise.
133 */
134#ifndef VM_LEVEL_0_ORDER
135#define VM_LEVEL_0_ORDER_PAE 9
136#define VM_LEVEL_0_ORDER_NOPAE 10
137#define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER_NOPAE
138#define VM_LEVEL_0_ORDER i386_pmap_VM_LEVEL_0_ORDER
139#else
140#define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER
141#endif
142
143/*
144 * Kernel physical load address.
145 */
146#ifndef KERNLOAD
147#define KERNLOAD (8 * 1024 * 1024)
148#endif /* !defined(KERNLOAD) */
149
150/*
151 * Virtual addresses of things. Derived from the page directory and
152 * page table indexes from pmap.h for precision.
153 * Because of the page that is both a PD and PT, it looks a little
154 * messy at times, but hey, we'll do anything to save a page :-)
155 */
156
157#define VM_MAX_KERNEL_ADDRESS (0xffffffffU - 16 * 1024 * 1024 + 1)
158
159#define VM_MIN_KERNEL_ADDRESS 0
160
161#define KERNBASE KERNLOAD
162
163#define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
164#define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
165
166#define VM_MAXUSER_ADDRESS (0xffffffff - 4 * 1024 * 1024 + 1)
167
168#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
169#define USRSTACK SHAREDPAGE
170
171#define VM_MAX_ADDRESS VADDR(PTDPTDI, 0)
172#define VM_MIN_ADDRESS ((vm_offset_t)0)
173
174#define PMAP_TRM_MIN_ADDRESS VM_MAXUSER_ADDRESS
175#define PMAP_TRM_MAX_ADDRESS 0xffffffff
176
177#define PMAP_MAP_LOW (4 * 1024 * 1024)
178
179/*
180 * KVA layout. The unit of the system allocation is single PDE, which
181 * represents NBPDR bytes, aligned to NBPDR. NBPDR is 4M for non-PAE
182 * page tables, and 2M for PAE, so PAE mode requires twice as many PTDs
183 * to create the same memory map as non-PAE.
184 *
185 * 0x00000000 - 0x003fffff Transient identity map of low memory (0-4M),
186 * normally disabled to catch NULL derefs.
187 * 0x00400000 - 0x007fffff Fixed mapping of the low memory (4-8M).
188 * 0x00800000 - 0xffbfffff KERNBASE (VA) == KERNLOAD (PA), kernel
189 * text + data and all kernel maps. Managed
190 * by MI VM.
191 * 0xffc00000 - 0xffdfffff Recursive kernel page table mapping, pointed
192 * to by PTmap. PTD[] recursively points
193 * into PTmap.
194 * 0xffe00000 - 0xffffffff Kernel/User mode shared PDE, contains GDT,
195 * IDT, TSS, LDT, trampoline code and stacks.
196 * Managed by pmap_trm_alloc().
197 */
198
199/*
200 * How many physical pages per kmem arena virtual page.
201 */
202#ifndef VM_KMEM_SIZE_SCALE
203#define VM_KMEM_SIZE_SCALE (1)
204#endif
205
206/*
207 * Optional floor (in bytes) on the size of the kmem arena.
208 */
209#ifndef VM_KMEM_SIZE_MIN
210#define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
211#endif
212
213/*
214 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
215 * kernel map rounded to the nearest multiple of the superpage size.
216 */
217#ifndef VM_KMEM_SIZE_MAX
218#define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \
219 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
220#endif
221
222/* initial pagein size of beginning of executable file */
223#ifndef VM_INITIAL_PAGEIN
224#define VM_INITIAL_PAGEIN 16
225#endif
226
227#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
228
229#ifndef VM_MAX_AUTOTUNE_MAXUSERS
230#define VM_MAX_AUTOTUNE_MAXUSERS 384
231#endif
232
233#define SFBUF
234#define SFBUF_MAP
235#define SFBUF_CPUSET
236#define SFBUF_PROCESS_PAGE
237
238#define PMAP_HAS_DMAP 0
239#define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; })
240#define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; })
241
242/*
243 * No non-transparent large page support in the pmap.
244 */
245#define PMAP_HAS_LARGEPAGES 0
246
247/*
248 * Need a page dump array for minidump.
249 */
250#define MINIDUMP_PAGE_TRACKING 1
251
252#endif /* _MACHINE_VMPARAM_H_ */