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
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
35 * from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
39 #ifndef _MACHINE_VMPARAM_H_
40 #define _MACHINE_VMPARAM_H_
43 * Virtual memory related constants, all in bytes
46 #define MAXTSIZ (1*1024*1024*1024) /* max text size */
49 #define DFLDSIZ (128*1024*1024) /* initial data size limit */
52 #define MAXDSIZ (1*1024*1024*1024) /* max data size */
55 #define DFLSSIZ (128*1024*1024) /* initial stack size limit */
58 #define MAXSSIZ (1*1024*1024*1024) /* max stack size */
61 #define SGROWSIZ (128*1024) /* amount to grow stack */
65 * The physical address space is sparsely populated.
67 #define VM_PHYSSEG_SPARSE
70 * The number of PHYSSEG entries must be one greater than the number
71 * of phys_avail entries because the phys_avail entry that spans the
72 * largest physical address that is accessible by ISA DMA is split
73 * into two PHYSSEG entries.
75 #define VM_PHYSSEG_MAX 64
78 * Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
79 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
80 * the pool from which physical pages for small UMA objects are
83 #define VM_NFREEPOOL 2
84 #define VM_FREEPOOL_DEFAULT 0
85 #define VM_FREEPOOL_DIRECT 1
88 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
89 * pages that are above the largest physical address that is
90 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
91 * that are below that address.
93 #define VM_NFREELIST 2
94 #define VM_FREELIST_DEFAULT 0
95 #define VM_FREELIST_ISADMA 1
98 * An allocation size of 16MB is supported in order to optimize the
99 * use of the direct map by UMA. Specifically, a cache line contains
100 * at most four TTEs, collectively mapping 16MB of physical memory.
101 * By reducing the number of distinct 16MB "pages" that are used by UMA,
102 * the physical memory allocator reduces the likelihood of both 4MB
103 * page TLB misses and cache misses caused by 4MB page TLB misses.
105 #define VM_NFREEORDER 12
108 * Disable superpage reservations.
110 #ifndef VM_NRESERVLEVEL
111 #define VM_NRESERVLEVEL 0
115 * Level 0 reservations consist of 512 pages.
117 #ifndef VM_LEVEL_0_ORDER
118 #define VM_LEVEL_0_ORDER 9
122 * Address space layout.
124 * RISC-V implements up to a 48 bit virtual address space. The address space is
125 * split into 2 regions at each end of the 64 bit address space, with an
126 * out of range "hole" in the middle.
128 * We limit the size of the two spaces to 39 bits each.
130 * Upper region: 0xffffffffffffffff
133 * Hole: 0xffffff7fffffffff
136 * Lower region: 0x0000007fffffffff
139 * We use the upper region for the kernel, and the lower region for userland.
141 * We define some interesting address constants:
143 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
144 * 64 bit address space, mostly just for convenience.
146 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
147 * mappable kernel virtual address space.
149 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
150 * user address space.
152 #define VM_MIN_ADDRESS (0x0000000000000000UL)
153 #define VM_MAX_ADDRESS (0xffffffffffffffffUL)
155 /* 32 GiB of kernel addresses */
156 #define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
157 #define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)
159 /* 128 GiB maximum for the direct map region */
160 #define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
161 #define DMAP_MAX_ADDRESS (0xfffffff000000000UL)
163 #define DMAP_MIN_PHYSADDR (dmap_phys_base)
164 #define DMAP_MAX_PHYSADDR (dmap_phys_max)
166 /* True if pa is in the dmap range */
167 #define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
168 (pa) < DMAP_MAX_PHYSADDR)
169 /* True if va is in the dmap range */
170 #define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
171 (va) < (dmap_max_addr))
173 #define PMAP_HAS_DMAP 1
174 #define PHYS_TO_DMAP(pa) \
176 KASSERT(PHYS_IN_DMAP(pa), \
177 ("%s: PA out of range, PA: 0x%lx", __func__, \
178 (vm_paddr_t)(pa))); \
179 ((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \
182 #define DMAP_TO_PHYS(va) \
184 KASSERT(VIRT_IN_DMAP(va), \
185 ("%s: VA out of range, VA: 0x%lx", __func__, \
186 (vm_offset_t)(va))); \
187 ((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \
190 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
191 #define VM_MAX_USER_ADDRESS (0x0000004000000000UL)
193 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
194 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
196 #define KERNBASE (VM_MIN_KERNEL_ADDRESS)
197 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
198 #define USRSTACK SHAREDPAGE
200 #define KERNENTRY (0)
203 * How many physical pages per kmem arena virtual page.
205 #ifndef VM_KMEM_SIZE_SCALE
206 #define VM_KMEM_SIZE_SCALE (3)
210 * Optional floor (in bytes) on the size of the kmem arena.
212 #ifndef VM_KMEM_SIZE_MIN
213 #define VM_KMEM_SIZE_MIN (16 * 1024 * 1024)
217 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
220 #ifndef VM_KMEM_SIZE_MAX
221 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
222 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
226 * Initial pagein size of beginning of executable file.
228 #ifndef VM_INITIAL_PAGEIN
229 #define VM_INITIAL_PAGEIN 16
234 * #define UMA_MD_SMALL_ALLOC
238 extern vm_paddr_t dmap_phys_base;
239 extern vm_paddr_t dmap_phys_max;
240 extern vm_offset_t dmap_max_addr;
241 extern u_int tsb_kernel_ldd_phys;
242 extern vm_offset_t vm_max_kernel_address;
243 extern vm_offset_t init_pt_va;
246 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
248 #define DEVMAP_MAX_VADDR VM_MAX_KERNEL_ADDRESS
250 #endif /* !_MACHINE_VMPARAM_H_ */