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
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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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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
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34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
39 #ifndef _MACHINE_VMPARAM_H_
40 #define _MACHINE_VMPARAM_H_ 1
43 * Machine dependent constants for 386.
47 * Virtual memory related constants, all in bytes
49 #define MAXTSIZ (128UL*1024*1024) /* max text size */
51 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
54 #define MAXDSIZ (512UL*1024*1024) /* max data size */
57 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
60 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
63 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
67 * The physical address space is densely populated.
69 #define VM_PHYSSEG_DENSE
72 * The number of PHYSSEG entries must be one greater than the number
73 * of phys_avail entries because the phys_avail entry that spans the
74 * largest physical address that is accessible by ISA DMA is split
75 * into two PHYSSEG entries.
77 #define VM_PHYSSEG_MAX 17
80 * Create two free page pools. Since the i386 kernel virtual address
81 * space does not include a mapping onto the machine's entire physical
82 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
83 * pool, VM_FREEPOOL_DEFAULT.
85 #define VM_NFREEPOOL 2
86 #define VM_FREEPOOL_CACHE 1
87 #define VM_FREEPOOL_DEFAULT 0
88 #define VM_FREEPOOL_DIRECT 0
91 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
92 * pages that are above the largest physical address that is
93 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
94 * that are below that address.
96 #define VM_NFREELIST 2
97 #define VM_FREELIST_DEFAULT 0
98 #define VM_FREELIST_ISADMA 1
101 * The largest allocation size is 2MB under PAE and 4MB otherwise.
104 #define VM_NFREEORDER 10
106 #define VM_NFREEORDER 11
110 * Enable superpage reservations: 1 level.
112 #ifndef VM_NRESERVLEVEL
113 #define VM_NRESERVLEVEL 1
117 * Level 0 reservations consist of 512 pages under PAE and 1024 pages
120 #ifndef VM_LEVEL_0_ORDER
122 #define VM_LEVEL_0_ORDER 9
124 #define VM_LEVEL_0_ORDER 10
129 * Kernel physical load address.
132 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
135 #define KERNLOAD (1 << PDRSHIFT)
137 #endif /* !defined(KERNLOAD) */
140 * Virtual addresses of things. Derived from the page directory and
141 * page table indexes from pmap.h for precision.
142 * Because of the page that is both a PD and PT, it looks a little
143 * messy at times, but hey, we'll do anything to save a page :-)
147 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START
149 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
152 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
154 #define KERNBASE VADDR(KPTDI, 0)
156 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
157 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
159 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
161 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
162 #define USRSTACK SHAREDPAGE
164 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
165 #define VM_MIN_ADDRESS ((vm_offset_t)0)
168 * How many physical pages per kmem arena virtual page.
170 #ifndef VM_KMEM_SIZE_SCALE
171 #define VM_KMEM_SIZE_SCALE (3)
175 * Optional floor (in bytes) on the size of the kmem arena.
177 #ifndef VM_KMEM_SIZE_MIN
178 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
182 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
183 * kernel map rounded to the nearest multiple of the superpage size.
185 #ifndef VM_KMEM_SIZE_MAX
186 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \
187 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
190 /* initial pagein size of beginning of executable file */
191 #ifndef VM_INITIAL_PAGEIN
192 #define VM_INITIAL_PAGEIN 16
195 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
197 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
198 #define VM_MAX_AUTOTUNE_MAXUSERS 384
204 #define SFBUF_PROCESS_PAGE
206 #endif /* _MACHINE_VMPARAM_H_ */