1 /* $NetBSD: vmparam.h,v 1.26 2003/08/07 16:27:47 agc Exp $ */
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36 #ifndef _MACHINE_VMPARAM_H_
37 #define _MACHINE_VMPARAM_H_
40 * Machine dependent constants for ARM.
44 * Virtual memory related constants, all in bytes
47 #define MAXTSIZ (256UL*1024*1024) /* max text size */
50 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
53 #define MAXDSIZ (512UL*1024*1024) /* max data size */
56 #define DFLSSIZ (2UL*1024*1024) /* initial stack size limit */
59 #define MAXSSIZ (8UL*1024*1024) /* max stack size */
62 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
66 * Address space constants
70 * The line between user space and kernel space
71 * Mappings >= KERNEL_BASE are constant across all processes
74 #define KERNBASE 0xc0000000
78 * The virtual address the kernel is linked to run at. For armv4/5 platforms
79 * the low-order 30 bits of this must match the low-order bits of the physical
80 * address the kernel is loaded at, so the value is most often provided as a
81 * kernel config option in the std.platform file. For armv6/7 the kernel can
82 * be loaded at any 2MB boundary, and KERNVIRTADDR can also be set to any 2MB
83 * boundary. It is typically overridden in the std.platform file only when
84 * KERNBASE is also set to a lower address to provide more KVA.
87 #define KERNVIRTADDR 0xc0000000
91 * max number of non-contig chunks of physical RAM you can have
94 #define VM_PHYSSEG_MAX 32
97 * The physical address space may be sparsely populated on some ARM systems.
99 #define VM_PHYSSEG_SPARSE
102 * Create one free page pool. Since the ARM kernel virtual address
103 * space does not include a mapping onto the machine's entire physical
104 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
105 * pool, VM_FREEPOOL_DEFAULT.
107 #define VM_NFREEPOOL 1
108 #define VM_FREEPOOL_DEFAULT 0
109 #define VM_FREEPOOL_DIRECT 0
112 * We need just one free list: DEFAULT.
114 #define VM_NFREELIST 1
115 #define VM_FREELIST_DEFAULT 0
118 * The largest allocation size is 1MB.
120 #define VM_NFREEORDER 9
123 * Enable superpage reservations: 1 level.
125 #ifndef VM_NRESERVLEVEL
126 #define VM_NRESERVLEVEL 1
130 * Level 0 reservations consist of 256 pages.
132 #ifndef VM_LEVEL_0_ORDER
133 #define VM_LEVEL_0_ORDER 8
136 #define VM_MIN_ADDRESS (0x00001000)
137 #ifndef VM_MAXUSER_ADDRESS
138 #define VM_MAXUSER_ADDRESS (KERNBASE - 0x00400000) /* !!! PT2MAP_SIZE */
140 #define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS
142 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
143 #define USRSTACK SHAREDPAGE
145 /* initial pagein size of beginning of executable file */
146 #ifndef VM_INITIAL_PAGEIN
147 #define VM_INITIAL_PAGEIN 16
150 #ifndef VM_MIN_KERNEL_ADDRESS
151 #define VM_MIN_KERNEL_ADDRESS KERNBASE
154 #define VM_MAX_KERNEL_ADDRESS (vm_max_kernel_address)
157 * How many physical pages per kmem arena virtual page.
159 #ifndef VM_KMEM_SIZE_SCALE
160 #define VM_KMEM_SIZE_SCALE (3)
164 * Optional floor (in bytes) on the size of the kmem arena.
166 #ifndef VM_KMEM_SIZE_MIN
167 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
171 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
174 #ifndef VM_KMEM_SIZE_MAX
175 #define VM_KMEM_SIZE_MAX ((vm_max_kernel_address - \
176 VM_MIN_KERNEL_ADDRESS + 1) * 2 / 5)
179 extern vm_offset_t vm_max_kernel_address;
181 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
183 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
184 #define VM_MAX_AUTOTUNE_MAXUSERS 384
190 #define PMAP_HAS_DMAP 0
191 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; })
192 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; })
194 #define DEVMAP_MAX_VADDR ARM_VECTORS_HIGH
197 * No non-transparent large page support in the pmap.
199 #define PMAP_HAS_LARGEPAGES 0
202 * Need a page dump array for minidump.
204 #define MINIDUMP_PAGE_TRACKING 1
206 #endif /* _MACHINE_VMPARAM_H_ */