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
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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 time for a process to be blocked before being very swappable.
68 * This is a number of seconds which the system takes as being a non-trivial
69 * amount of real time. You probably shouldn't change this;
70 * it is used in subtle ways (fractions and multiples of it are, that is, like
71 * half of a ``long time'', almost a long time, etc.)
72 * It is related to human patience and other factors which don't really
79 * The physical address space is densely populated.
81 #define VM_PHYSSEG_DENSE
84 * The number of PHYSSEG entries must be one greater than the number
85 * of phys_avail entries because the phys_avail entry that spans the
86 * largest physical address that is accessible by ISA DMA is split
87 * into two PHYSSEG entries.
89 #define VM_PHYSSEG_MAX 17
92 * Create two free page pools. Since the i386 kernel virtual address
93 * space does not include a mapping onto the machine's entire physical
94 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
95 * pool, VM_FREEPOOL_DEFAULT.
97 #define VM_NFREEPOOL 2
98 #define VM_FREEPOOL_CACHE 1
99 #define VM_FREEPOOL_DEFAULT 0
100 #define VM_FREEPOOL_DIRECT 0
103 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
104 * pages that are above the largest physical address that is
105 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
106 * that are below that address.
108 #define VM_NFREELIST 2
109 #define VM_FREELIST_DEFAULT 0
110 #define VM_FREELIST_ISADMA 1
113 * The largest allocation size is 2MB under PAE and 4MB otherwise.
116 #define VM_NFREEORDER 10
118 #define VM_NFREEORDER 11
122 * Only one memory domain.
129 * Enable superpage reservations: 1 level.
131 #ifndef VM_NRESERVLEVEL
132 #define VM_NRESERVLEVEL 1
136 * Level 0 reservations consist of 512 pages under PAE and 1024 pages
139 #ifndef VM_LEVEL_0_ORDER
141 #define VM_LEVEL_0_ORDER 9
143 #define VM_LEVEL_0_ORDER 10
148 * Kernel physical load address.
151 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
154 #define KERNLOAD (1 << PDRSHIFT)
156 #endif /* !defined(KERNLOAD) */
159 * Virtual addresses of things. Derived from the page directory and
160 * page table indexes from pmap.h for precision.
161 * Because of the page that is both a PD and PT, it looks a little
162 * messy at times, but hey, we'll do anything to save a page :-)
166 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START
168 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
171 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
173 #define KERNBASE VADDR(KPTDI, 0)
175 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
176 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
178 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
180 #define USRSTACK VM_MAXUSER_ADDRESS
182 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
183 #define VM_MIN_ADDRESS ((vm_offset_t)0)
185 /* virtual sizes (bytes) for various kernel submaps */
187 #define VM_KMEM_SIZE (12 * 1024 * 1024)
191 * How many physical pages per KVA page allocated.
192 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
193 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
194 * is the total KVA space allocated for kmem_map.
196 #ifndef VM_KMEM_SIZE_SCALE
197 #define VM_KMEM_SIZE_SCALE (3)
201 * Ceiling on amount of kmem_map kva space.
203 #ifndef VM_KMEM_SIZE_MAX
204 #define VM_KMEM_SIZE_MAX (320 * 1024 * 1024)
207 /* initial pagein size of beginning of executable file */
208 #ifndef VM_INITIAL_PAGEIN
209 #define VM_INITIAL_PAGEIN 16
212 #endif /* _MACHINE_VMPARAM_H_ */