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
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18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
39 * from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
43 #ifndef _MACHINE_VMPARAM_H_
44 #define _MACHINE_VMPARAM_H_
47 * Virtual memory related constants, all in bytes
50 #define MAXTSIZ (1*1024*1024*1024) /* max text size */
53 #define DFLDSIZ (128*1024*1024) /* initial data size limit */
56 #define MAXDSIZ (1*1024*1024*1024) /* max data size */
59 #define DFLSSIZ (128*1024*1024) /* initial stack size limit */
62 #define MAXSSIZ (1*1024*1024*1024) /* max stack size */
65 #define SGROWSIZ (128*1024) /* amount to grow stack */
69 * The time for a process to be blocked before being very swappable.
70 * This is a number of seconds which the system takes as being a non-trivial
71 * amount of real time. You probably shouldn't change this;
72 * it is used in subtle ways (fractions and multiples of it are, that is, like
73 * half of a ``long time'', almost a long time, etc.)
74 * It is related to human patience and other factors which don't really
80 * The physical address space is sparsely populated.
82 #define VM_PHYSSEG_SPARSE
85 * The number of PHYSSEG entries must be one greater than the number
86 * of phys_avail entries because the phys_avail entry that spans the
87 * largest physical address that is accessible by ISA DMA is split
88 * into two PHYSSEG entries.
90 #define VM_PHYSSEG_MAX 64
93 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
94 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
95 * the pool from which physical pages for small UMA objects are
98 #define VM_NFREEPOOL 3
99 #define VM_FREEPOOL_CACHE 2
100 #define VM_FREEPOOL_DEFAULT 0
101 #define VM_FREEPOOL_DIRECT 1
104 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
105 * pages that are above the largest physical address that is
106 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
107 * that are below that address.
109 #define VM_NFREELIST 2
110 #define VM_FREELIST_DEFAULT 0
111 #define VM_FREELIST_ISADMA 1
114 * An allocation size of 16MB is supported in order to optimize the
115 * use of the direct map by UMA. Specifically, a cache line contains
116 * at most four TTEs, collectively mapping 16MB of physical memory.
117 * By reducing the number of distinct 16MB "pages" that are used by UMA,
118 * the physical memory allocator reduces the likelihood of both 4MB
119 * page TLB misses and cache misses caused by 4MB page TLB misses.
121 #define VM_NFREEORDER 12
124 * Enable superpage reservations: 1 level.
126 #ifndef VM_NRESERVLEVEL
127 #define VM_NRESERVLEVEL 1
131 * Level 0 reservations consist of 512 pages.
133 #ifndef VM_LEVEL_0_ORDER
134 #define VM_LEVEL_0_ORDER 9
138 * Address space layout.
140 * UltraSPARC I and II implement a 44 bit virtual address space. The address
141 * space is split into 2 regions at each end of the 64 bit address space, with
142 * an out of range "hole" in the middle. UltraSPARC III implements the full
143 * 64 bit virtual address space, but we don't really have any use for it and
144 * 43 bits of user address space is considered to be "enough", so we ignore it.
146 * Upper region: 0xffffffffffffffff
149 * Hole: 0xfffff7ffffffffff
152 * Lower region: 0x000007ffffffffff
155 * In general we ignore the upper region, and use the lower region as mappable
158 * We define some interesting address constants:
160 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and of the entire 64 bit
161 * address space, mostly just for convenience.
163 * VM_MIN_DIRECT_ADDRESS and VM_MAX_DIRECT_ADDRESS define the start and end
164 * of the direct mapped region. This maps virtual addresses to physical
165 * addresses directly using 4mb tlb entries, with the physical address encoded
166 * in the lower 43 bits of virtual address. These mappings are convenient
167 * because they do not require page tables, and because they never change they
168 * do not require tlb flushes. However, since these mappings are cacheable,
169 * we must ensure that all pages accessed this way are either not double
170 * mapped, or that all other mappings have virtual color equal to physical
171 * color, in order to avoid creating illegal aliases in the data cache.
173 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
174 * mappable kernel virtual address space. VM_MIN_KERNEL_ADDRESS is basically
175 * arbitrary, a convenient address is chosen which allows both the kernel text
176 * and data and the prom's address space to be mapped with 1 4mb tsb page.
177 * VM_MAX_KERNEL_ADDRESS is variable, computed at startup time based on the
178 * amount of physical memory available. Each 4mb tsb page provides 1g of
179 * virtual address space, with the only practical limit being available
182 * VM_MIN_PROM_ADDRESS and VM_MAX_PROM_ADDRESS define the start and end of the
183 * prom address space. On startup the prom's mappings are duplicated in the
184 * kernel tsb, to allow prom memory to be accessed normally by the kernel.
186 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
187 * user address space. There are some hardware errata about using addresses
188 * at the boundary of the va hole, so we allow just under 43 bits of user
189 * address space. Note that the kernel and user address spaces overlap, but
190 * this doesn't matter because they use different tlb contexts, and because
191 * the kernel address space is not mapped into each process' address space.
193 #define VM_MIN_ADDRESS (0x0000000000000000UL)
194 #define VM_MAX_ADDRESS (0xffffffffffffffffUL)
196 #define VM_MIN_DIRECT_ADDRESS (0xfffff80000000000UL)
197 #define VM_MAX_DIRECT_ADDRESS (VM_MAX_ADDRESS)
199 #define VM_MIN_KERNEL_ADDRESS (0x00000000c0000000UL)
200 #define VM_MAX_KERNEL_ADDRESS (vm_max_kernel_address)
202 #define VM_MIN_PROM_ADDRESS (0x00000000f0000000UL)
203 #define VM_MAX_PROM_ADDRESS (0x00000000ffffffffUL)
205 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
206 #define VM_MAX_USER_ADDRESS (0x000007fe00000000UL)
208 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
209 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
211 #define KERNBASE (VM_MIN_KERNEL_ADDRESS)
212 #define PROMBASE (VM_MIN_PROM_ADDRESS)
213 #define USRSTACK (VM_MAX_USER_ADDRESS)
216 * Virtual size (bytes) for various kernel submaps.
219 #define VM_KMEM_SIZE (16*1024*1024)
223 * How many physical pages per KVA page allocated.
224 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
225 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
226 * is the total KVA space allocated for kmem_map.
228 #ifndef VM_KMEM_SIZE_SCALE
229 #define VM_KMEM_SIZE_SCALE (3)
233 * Initial pagein size of beginning of executable file.
235 #ifndef VM_INITIAL_PAGEIN
236 #define VM_INITIAL_PAGEIN 16
239 #define UMA_MD_SMALL_ALLOC
241 extern vm_offset_t vm_max_kernel_address;
243 #endif /* !_MACHINE_VMPARAM_H_ */