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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20 * without specific prior written permission.
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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.
46 #define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */
49 * Virtual memory related constants, all in bytes
51 #define MAXTSIZ (128UL*1024*1024) /* max text size */
53 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
56 #define MAXDSIZ (512UL*1024*1024) /* max data size */
59 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
62 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
65 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
68 #define USRTEXT (1*PAGE_SIZE) /* base of user text XXX bogus */
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 * Kernel physical load address.
86 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
89 #define KERNLOAD (1 << PDRSHIFT)
94 * Virtual addresses of things. Derived from the page directory and
95 * page table indexes from pmap.h for precision.
96 * Because of the page that is both a PD and PT, it looks a little
97 * messy at times, but hey, we'll do anything to save a page :-)
101 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START
103 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
105 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
107 #define KERNBASE VADDR(KPTDI, 0)
109 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
110 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
112 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
114 #define USRSTACK VM_MAXUSER_ADDRESS
116 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
117 #define VM_MIN_ADDRESS ((vm_offset_t)0)
119 /* virtual sizes (bytes) for various kernel submaps */
121 #define VM_KMEM_SIZE (12 * 1024 * 1024)
125 * How many physical pages per KVA page allocated.
126 * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
127 * is the total KVA space allocated for kmem_map.
129 #ifndef VM_KMEM_SIZE_SCALE
130 #define VM_KMEM_SIZE_SCALE (3)
134 * Ceiling on amount of kmem_map kva space.
136 #ifndef VM_KMEM_SIZE_MAX
137 #define VM_KMEM_SIZE_MAX (320 * 1024 * 1024)
140 /* initial pagein size of beginning of executable file */
141 #ifndef VM_INITIAL_PAGEIN
142 #define VM_INITIAL_PAGEIN 16
145 #endif /* _MACHINE_VMPARAM_H_ */