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.
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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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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
44 #ifndef _MACHINE_VMPARAM_H_
45 #define _MACHINE_VMPARAM_H_
48 * Virtual memory related constants, all in bytes
51 #define MAXTSIZ (1*1024*1024*1024) /* max text size */
54 #define DFLDSIZ (128*1024*1024) /* initial data size limit */
57 #define MAXDSIZ (1*1024*1024*1024) /* max data size */
60 #define DFLSSIZ (128*1024*1024) /* initial stack size limit */
63 #define MAXSSIZ (1*1024*1024*1024) /* max stack size */
66 #define SGROWSIZ (128*1024) /* amount to grow stack */
70 * The time for a process to be blocked before being very swappable.
71 * This is a number of seconds which the system takes as being a non-trivial
72 * amount of real time. You probably shouldn't change this;
73 * it is used in subtle ways (fractions and multiples of it are, that is, like
74 * half of a ``long time'', almost a long time, etc.)
75 * It is related to human patience and other factors which don't really
81 * The physical address space is sparsely populated.
83 #define VM_PHYSSEG_SPARSE
86 * The number of PHYSSEG entries must be one greater than the number
87 * of phys_avail entries because the phys_avail entry that spans the
88 * largest physical address that is accessible by ISA DMA is split
89 * into two PHYSSEG entries.
91 #define VM_PHYSSEG_MAX 64
94 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
95 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
96 * the pool from which physical pages for small UMA objects are
99 #define VM_NFREEPOOL 3
100 #define VM_FREEPOOL_CACHE 2
101 #define VM_FREEPOOL_DEFAULT 0
102 #define VM_FREEPOOL_DIRECT 1
105 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
106 * pages that are above the largest physical address that is
107 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
108 * that are below that address.
110 #define VM_NFREELIST 2
111 #define VM_FREELIST_DEFAULT 0
112 #define VM_FREELIST_ISADMA 1
115 * An allocation size of 16MB is supported in order to optimize the
116 * use of the direct map by UMA. Specifically, a cache line contains
117 * at most four TTEs, collectively mapping 16MB of physical memory.
118 * By reducing the number of distinct 16MB "pages" that are used by UMA,
119 * the physical memory allocator reduces the likelihood of both 4MB
120 * page TLB misses and cache misses caused by 4MB page TLB misses.
122 #define VM_NFREEORDER 12
125 * Disable superpage reservations.
127 #ifndef VM_NRESERVLEVEL
128 #define VM_NRESERVLEVEL 0
132 * Address space layout.
134 * UltraSPARC I and II implement a 44 bit virtual address space. The address
135 * space is split into 2 regions at each end of the 64 bit address space, with
136 * an out of range "hole" in the middle. UltraSPARC III implements the full
137 * 64 bit virtual address space, but we don't really have any use for it and
138 * 43 bits of user address space is considered to be "enough", so we ignore it.
140 * Upper region: 0xffffffffffffffff
143 * Hole: 0xfffff7ffffffffff
146 * Lower region: 0x000007ffffffffff
149 * In general we ignore the upper region, and use the lower region as mappable
152 * We define some interesting address constants:
154 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and of the entire 64 bit
155 * address space, mostly just for convenience.
157 * VM_MIN_DIRECT_ADDRESS and VM_MAX_DIRECT_ADDRESS define the start and end
158 * of the direct mapped region. This maps virtual addresses to physical
159 * addresses directly using 4mb tlb entries, with the physical address encoded
160 * in the lower 43 bits of virtual address. These mappings are convenient
161 * because they do not require page tables, and because they never change they
162 * do not require tlb flushes. However, since these mappings are cacheable,
163 * we must ensure that all pages accessed this way are either not double
164 * mapped, or that all other mappings have virtual color equal to physical
165 * color, in order to avoid creating illegal aliases in the data cache.
167 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
168 * mappable kernel virtual address space. VM_MIN_KERNEL_ADDRESS is basically
169 * arbitrary, a convenient address is chosen which allows both the kernel text
170 * and data and the prom's address space to be mapped with 1 4mb tsb page.
171 * VM_MAX_KERNEL_ADDRESS is variable, computed at startup time based on the
172 * amount of physical memory available. Each 4mb tsb page provides 1g of
173 * virtual address space, with the only practical limit being available
176 * VM_MIN_PROM_ADDRESS and VM_MAX_PROM_ADDRESS define the start and end of the
177 * prom address space. On startup the prom's mappings are duplicated in the
178 * kernel tsb, to allow prom memory to be accessed normally by the kernel.
180 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
181 * user address space. There are some hardware errata about using addresses
182 * at the boundary of the va hole, so we allow just under 43 bits of user
183 * address space. Note that the kernel and user address spaces overlap, but
184 * this doesn't matter because they use different tlb contexts, and because
185 * the kernel address space is not mapped into each process' address space.
187 #define VM_MIN_ADDRESS (0x0000000000000000UL)
188 #define VM_MAX_ADDRESS (0xffffffffffffffffUL)
190 #define VM_MIN_DIRECT_ADDRESS (0xfffff80000000000UL)
191 #define VM_MAX_DIRECT_ADDRESS (VM_MAX_ADDRESS)
193 #define VM_MIN_KERNEL_ADDRESS (0x00000000c0000000UL)
194 #define VM_MAX_KERNEL_ADDRESS (vm_max_kernel_address)
196 #define VM_MIN_PROM_ADDRESS (0x00000000f0000000UL)
197 #define VM_MAX_PROM_ADDRESS (0x00000000ffffffffUL)
199 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
200 #define VM_MAX_USER_ADDRESS (0x000007fe00000000UL)
202 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
203 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
205 #define KERNBASE (VM_MIN_KERNEL_ADDRESS)
206 #define USRSTACK (VM_MAX_USER_ADDRESS)
209 * Virtual size (bytes) for various kernel submaps.
212 #define VM_KMEM_SIZE (16*1024*1024)
216 * How many physical pages per KVA page allocated.
217 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
218 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
219 * is the total KVA space allocated for kmem_map.
221 #ifndef VM_KMEM_SIZE_SCALE
222 #define VM_KMEM_SIZE_SCALE (3)
226 * Initial pagein size of beginning of executable file.
228 #ifndef VM_INITIAL_PAGEIN
229 #define VM_INITIAL_PAGEIN 16
232 #define UMA_MD_SMALL_ALLOC
234 extern vm_offset_t vm_max_kernel_address;
236 #endif /* !_MACHINE_VMPARAM_H_ */