2 * Copyright (c) 1990 The Regents of the University of California.
4 * Copyright (c) 1994 John S. Dyson
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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 * 4. 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.
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
34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
35 * from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
39 #ifndef _MACHINE_VMPARAM_H_
40 #define _MACHINE_VMPARAM_H_
43 * Virtual memory related constants, all in bytes
46 #define MAXTSIZ (1*1024*1024*1024) /* max text size */
49 #define DFLDSIZ (128*1024*1024) /* initial data size limit */
52 #define MAXDSIZ (1*1024*1024*1024) /* max data size */
55 #define DFLSSIZ (128*1024*1024) /* initial stack size limit */
58 #define MAXSSIZ (1*1024*1024*1024) /* max stack size */
61 #define SGROWSIZ (128*1024) /* amount to grow stack */
65 * The time for a process to be blocked before being very swappable.
66 * This is a number of seconds which the system takes as being a non-trivial
67 * amount of real time. You probably shouldn't change this;
68 * it is used in subtle ways (fractions and multiples of it are, that is, like
69 * half of a ``long time'', almost a long time, etc.)
70 * It is related to human patience and other factors which don't really
76 * The physical address space is sparsely populated.
78 #define VM_PHYSSEG_SPARSE
81 * The number of PHYSSEG entries must be one greater than the number
82 * of phys_avail entries because the phys_avail entry that spans the
83 * largest physical address that is accessible by ISA DMA is split
84 * into two PHYSSEG entries.
86 #define VM_PHYSSEG_MAX 64
89 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
90 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
91 * the pool from which physical pages for small UMA objects are
94 #define VM_NFREEPOOL 3
95 #define VM_FREEPOOL_CACHE 2
96 #define VM_FREEPOOL_DEFAULT 0
97 #define VM_FREEPOOL_DIRECT 1
100 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
101 * pages that are above the largest physical address that is
102 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
103 * that are below that address.
105 #define VM_NFREELIST 2
106 #define VM_FREELIST_DEFAULT 0
107 #define VM_FREELIST_ISADMA 1
110 * An allocation size of 16MB is supported in order to optimize the
111 * use of the direct map by UMA. Specifically, a cache line contains
112 * at most four TTEs, collectively mapping 16MB of physical memory.
113 * By reducing the number of distinct 16MB "pages" that are used by UMA,
114 * the physical memory allocator reduces the likelihood of both 4MB
115 * page TLB misses and cache misses caused by 4MB page TLB misses.
117 #define VM_NFREEORDER 12
120 * Enable superpage reservations: 1 level.
122 #ifndef VM_NRESERVLEVEL
123 #define VM_NRESERVLEVEL 1
127 * Level 0 reservations consist of 512 pages.
129 #ifndef VM_LEVEL_0_ORDER
130 #define VM_LEVEL_0_ORDER 9
134 * Address space layout.
136 * UltraSPARC I and II implement a 44 bit virtual address space. The address
137 * space is split into 2 regions at each end of the 64 bit address space, with
138 * an out of range "hole" in the middle. UltraSPARC III implements the full
139 * 64 bit virtual address space, but we don't really have any use for it and
140 * 43 bits of user address space is considered to be "enough", so we ignore it.
142 * Upper region: 0xffffffffffffffff
145 * Hole: 0xfffff7ffffffffff
148 * Lower region: 0x000007ffffffffff
151 * In general we ignore the upper region, and use the lower region as mappable
154 * We define some interesting address constants:
156 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and of the entire 64 bit
157 * address space, mostly just for convenience.
159 * VM_MIN_DIRECT_ADDRESS and VM_MAX_DIRECT_ADDRESS define the start and end
160 * of the direct mapped region. This maps virtual addresses to physical
161 * addresses directly using 4mb tlb entries, with the physical address encoded
162 * in the lower 43 bits of virtual address. These mappings are convenient
163 * because they do not require page tables, and because they never change they
164 * do not require tlb flushes. However, since these mappings are cacheable,
165 * we must ensure that all pages accessed this way are either not double
166 * mapped, or that all other mappings have virtual color equal to physical
167 * color, in order to avoid creating illegal aliases in the data cache.
169 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
170 * mappable kernel virtual address space. VM_MIN_KERNEL_ADDRESS is basically
171 * arbitrary, a convenient address is chosen which allows both the kernel text
172 * and data and the prom's address space to be mapped with 1 4mb tsb page.
173 * VM_MAX_KERNEL_ADDRESS is variable, computed at startup time based on the
174 * amount of physical memory available. Each 4mb tsb page provides 1g of
175 * virtual address space, with the only practical limit being available
178 * VM_MIN_PROM_ADDRESS and VM_MAX_PROM_ADDRESS define the start and end of the
179 * prom address space. On startup the prom's mappings are duplicated in the
180 * kernel tsb, to allow prom memory to be accessed normally by the kernel.
182 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
183 * user address space. There are some hardware errata about using addresses
184 * at the boundary of the va hole, so we allow just under 43 bits of user
185 * address space. Note that the kernel and user address spaces overlap, but
186 * this doesn't matter because they use different tlb contexts, and because
187 * the kernel address space is not mapped into each process' address space.
189 #define VM_MIN_ADDRESS (0x0000000000000000UL)
190 #define VM_MAX_ADDRESS (0xffffffffffffffffUL)
192 #define VM_MIN_DIRECT_ADDRESS (0xfffff80000000000UL)
193 #define VM_MAX_DIRECT_ADDRESS (VM_MAX_ADDRESS)
195 #define VM_MIN_KERNEL_ADDRESS (0x00000000c0000000UL)
196 #define VM_MAX_KERNEL_ADDRESS (vm_max_kernel_address)
198 #define VM_MIN_PROM_ADDRESS (0x00000000f0000000UL)
199 #define VM_MAX_PROM_ADDRESS (0x00000000ffffffffUL)
201 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
202 #define VM_MAX_USER_ADDRESS (0x000007fe00000000UL)
204 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
205 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
207 #define KERNBASE (VM_MIN_KERNEL_ADDRESS)
208 #define PROMBASE (VM_MIN_PROM_ADDRESS)
209 #define USRSTACK (VM_MAX_USER_ADDRESS)
212 * Virtual size (bytes) for various kernel submaps.
215 #define VM_KMEM_SIZE (16*1024*1024)
219 * How many physical pages per KVA page allocated.
220 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
221 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
222 * is the total KVA space allocated for kmem_map.
224 #ifndef VM_KMEM_SIZE_SCALE
225 #define VM_KMEM_SIZE_SCALE (tsb_kernel_ldd_phys == 0 ? 3 : 1)
229 * Ceiling on amount of kmem_map kva space.
231 #ifndef VM_KMEM_SIZE_MAX
232 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
233 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
237 * Initial pagein size of beginning of executable file.
239 #ifndef VM_INITIAL_PAGEIN
240 #define VM_INITIAL_PAGEIN 16
243 #define UMA_MD_SMALL_ALLOC
245 extern u_int tsb_kernel_ldd_phys;
246 extern vm_offset_t vm_max_kernel_address;
248 #endif /* !_MACHINE_VMPARAM_H_ */