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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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 #define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */
51 * Virtual memory related constants, all in bytes
53 #define MAXTSIZ (128UL*1024*1024) /* max text size */
55 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
58 #define MAXDSIZ (512UL*1024*1024) /* max data size */
61 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
64 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
67 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
71 * The time for a process to be blocked before being very swappable.
72 * This is a number of seconds which the system takes as being a non-trivial
73 * amount of real time. You probably shouldn't change this;
74 * it is used in subtle ways (fractions and multiples of it are, that is, like
75 * half of a ``long time'', almost a long time, etc.)
76 * It is related to human patience and other factors which don't really
83 * The physical address space is densely populated.
85 #define VM_PHYSSEG_DENSE
88 * The number of PHYSSEG entries must be one greater than the number
89 * of phys_avail entries because the phys_avail entry that spans the
90 * largest physical address that is accessible by ISA DMA is split
91 * into two PHYSSEG entries.
93 #define VM_PHYSSEG_MAX 17
96 * Create two free page pools. Since the i386 kernel virtual address
97 * space does not include a mapping onto the machine's entire physical
98 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
99 * pool, VM_FREEPOOL_DEFAULT.
101 #define VM_NFREEPOOL 2
102 #define VM_FREEPOOL_CACHE 1
103 #define VM_FREEPOOL_DEFAULT 0
104 #define VM_FREEPOOL_DIRECT 0
107 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
108 * pages that are above the largest physical address that is
109 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
110 * that are below that address.
112 #define VM_NFREELIST 2
113 #define VM_FREELIST_DEFAULT 0
114 #define VM_FREELIST_ISADMA 1
117 * The largest allocation size is 2MB under PAE and 4MB otherwise.
120 #define VM_NFREEORDER 10
122 #define VM_NFREEORDER 11
126 * Kernel physical load address.
129 #define KERNLOAD (1 << PDRSHIFT)
133 * Virtual addresses of things. Derived from the page directory and
134 * page table indexes from pmap.h for precision.
135 * Because of the page that is both a PD and PT, it looks a little
136 * messy at times, but hey, we'll do anything to save a page :-)
139 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
140 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
142 #define KERNBASE VADDR(KPTDI, 0)
144 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
145 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
147 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
149 #define USRSTACK VM_MAXUSER_ADDRESS
151 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
152 #define VM_MIN_ADDRESS ((vm_offset_t)0)
154 /* virtual sizes (bytes) for various kernel submaps */
156 #define VM_KMEM_SIZE (12 * 1024 * 1024)
160 * How many physical pages per KVA page allocated.
161 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
162 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
163 * is the total KVA space allocated for kmem_map.
165 #ifndef VM_KMEM_SIZE_SCALE
166 #define VM_KMEM_SIZE_SCALE (3)
170 * Ceiling on amount of kmem_map kva space.
172 #ifndef VM_KMEM_SIZE_MAX
173 #define VM_KMEM_SIZE_MAX (320 * 1024 * 1024)
176 /* initial pagein size of beginning of executable file */
177 #ifndef VM_INITIAL_PAGEIN
178 #define VM_INITIAL_PAGEIN 16
181 #endif /* _MACHINE_VMPARAM_H_ */