1 /* $NetBSD: vmparam.h,v 1.26 2003/08/07 16:27:47 agc Exp $ */
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34 #ifndef _MACHINE_VMPARAM_H_
35 #define _MACHINE_VMPARAM_H_
38 * Machine dependent constants for ARM.
42 * Virtual memory related constants, all in bytes
45 #define MAXTSIZ (64UL*1024*1024) /* max text size */
48 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
51 #define MAXDSIZ (512UL*1024*1024) /* max data size */
54 #define DFLSSIZ (2UL*1024*1024) /* initial stack size limit */
57 #define MAXSSIZ (8UL*1024*1024) /* max stack size */
60 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
64 * Address space constants
68 * The line between user space and kernel space
69 * Mappings >= KERNEL_BASE are constant across all processes
72 #define KERNBASE 0xc0000000
76 * max number of non-contig chunks of physical RAM you can have
79 #define VM_PHYSSEG_MAX 32
82 * The physical address space may be sparsely populated on some ARM systems.
84 #define VM_PHYSSEG_SPARSE
87 * Create two free page pools. Since the ARM kernel virtual address
88 * space does not include a mapping onto the machine's entire physical
89 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
90 * pool, VM_FREEPOOL_DEFAULT.
92 #define VM_NFREEPOOL 2
93 #define VM_FREEPOOL_CACHE 1
94 #define VM_FREEPOOL_DEFAULT 0
95 #define VM_FREEPOOL_DIRECT 0
98 * We need just one free list: DEFAULT.
100 #define VM_NFREELIST 1
101 #define VM_FREELIST_DEFAULT 0
104 * The largest allocation size is 1MB.
106 #define VM_NFREEORDER 9
109 * Enable superpage reservations: 1 level.
111 #ifndef VM_NRESERVLEVEL
112 #define VM_NRESERVLEVEL 1
116 * Level 0 reservations consist of 256 pages.
118 #ifndef VM_LEVEL_0_ORDER
119 #define VM_LEVEL_0_ORDER 8
122 #define UPT_MAX_ADDRESS VADDR(UPTPTDI + 3, 0)
123 #define UPT_MIN_ADDRESS VADDR(UPTPTDI, 0)
125 #define VM_MIN_ADDRESS (0x00001000)
126 #ifndef VM_MAXUSER_ADDRESS
127 #define VM_MAXUSER_ADDRESS KERNBASE
128 #endif /* VM_MAXUSER_ADDRESS */
129 #define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS
131 #define USRSTACK VM_MAXUSER_ADDRESS
133 /* initial pagein size of beginning of executable file */
134 #ifndef VM_INITIAL_PAGEIN
135 #define VM_INITIAL_PAGEIN 16
138 #ifndef VM_MIN_KERNEL_ADDRESS
139 #define VM_MIN_KERNEL_ADDRESS KERNBASE
142 #define VM_MAX_KERNEL_ADDRESS (vm_max_kernel_address)
145 * How many physical pages per kmem arena virtual page.
147 #ifndef VM_KMEM_SIZE_SCALE
148 #define VM_KMEM_SIZE_SCALE (3)
152 * Optional floor (in bytes) on the size of the kmem arena.
154 #ifndef VM_KMEM_SIZE_MIN
155 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
159 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
162 #ifndef VM_KMEM_SIZE_MAX
163 #define VM_KMEM_SIZE_MAX ((vm_max_kernel_address - \
164 VM_MIN_KERNEL_ADDRESS + 1) * 2 / 5)
167 extern vm_offset_t vm_max_kernel_address;
169 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
171 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
172 #define VM_MAX_AUTOTUNE_MAXUSERS 384
175 #endif /* _MACHINE_VMPARAM_H_ */