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
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.
72 #define VM_PHYSSEG_MAX 64
75 * Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
76 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
77 * the pool from which physical pages for small UMA objects are
80 #define VM_NFREEPOOL 2
81 #define VM_FREEPOOL_DEFAULT 0
82 #define VM_FREEPOOL_DIRECT 1
85 * Create one free page list: VM_FREELIST_DEFAULT is for all physical
88 #define VM_NFREELIST 1
89 #define VM_FREELIST_DEFAULT 0
92 * An allocation size of 16MB is supported in order to optimize the
93 * use of the direct map by UMA. Specifically, a cache line contains
94 * at most four TTEs, collectively mapping 16MB of physical memory.
95 * By reducing the number of distinct 16MB "pages" that are used by UMA,
96 * the physical memory allocator reduces the likelihood of both 4MB
97 * page TLB misses and cache misses caused by 4MB page TLB misses.
99 #define VM_NFREEORDER 12
102 * Disable superpage reservations.
104 #ifndef VM_NRESERVLEVEL
105 #define VM_NRESERVLEVEL 0
109 * Level 0 reservations consist of 512 pages.
111 #ifndef VM_LEVEL_0_ORDER
112 #define VM_LEVEL_0_ORDER 9
116 * Address space layout.
118 * RISC-V implements up to a 48 bit virtual address space. The address space is
119 * split into 2 regions at each end of the 64 bit address space, with an
120 * out of range "hole" in the middle.
122 * We limit the size of the two spaces to 39 bits each.
124 * Upper region: 0xffffffffffffffff
127 * Hole: 0xffffff7fffffffff
130 * Lower region: 0x0000007fffffffff
133 * We use the upper region for the kernel, and the lower region for userland.
135 * We define some interesting address constants:
137 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
138 * 64 bit address space, mostly just for convenience.
140 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
141 * mappable kernel virtual address space.
143 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
144 * user address space.
146 #define VM_MIN_ADDRESS (0x0000000000000000UL)
147 #define VM_MAX_ADDRESS (0xffffffffffffffffUL)
149 /* 32 GiB of kernel addresses */
150 #define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
151 #define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)
153 /* 128 GiB maximum for the direct map region */
154 #define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
155 #define DMAP_MAX_ADDRESS (0xfffffff000000000UL)
157 #define DMAP_MIN_PHYSADDR (dmap_phys_base)
158 #define DMAP_MAX_PHYSADDR (dmap_phys_max)
160 /* True if pa is in the dmap range */
161 #define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
162 (pa) < DMAP_MAX_PHYSADDR)
163 /* True if va is in the dmap range */
164 #define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
165 (va) < (dmap_max_addr))
167 #define PMAP_HAS_DMAP 1
168 #define PHYS_TO_DMAP(pa) \
170 KASSERT(PHYS_IN_DMAP(pa), \
171 ("%s: PA out of range, PA: 0x%lx", __func__, \
172 (vm_paddr_t)(pa))); \
173 ((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \
176 #define DMAP_TO_PHYS(va) \
178 KASSERT(VIRT_IN_DMAP(va), \
179 ("%s: VA out of range, VA: 0x%lx", __func__, \
180 (vm_offset_t)(va))); \
181 ((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \
184 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
185 #define VM_MAX_USER_ADDRESS (0x0000004000000000UL)
187 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
188 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
190 #define KERNBASE (VM_MIN_KERNEL_ADDRESS)
191 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
192 #define USRSTACK SHAREDPAGE
194 #define KERNENTRY (0)
197 * How many physical pages per kmem arena virtual page.
199 #ifndef VM_KMEM_SIZE_SCALE
200 #define VM_KMEM_SIZE_SCALE (3)
204 * Optional floor (in bytes) on the size of the kmem arena.
206 #ifndef VM_KMEM_SIZE_MIN
207 #define VM_KMEM_SIZE_MIN (16 * 1024 * 1024)
211 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
214 #ifndef VM_KMEM_SIZE_MAX
215 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
216 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
220 * Initial pagein size of beginning of executable file.
222 #ifndef VM_INITIAL_PAGEIN
223 #define VM_INITIAL_PAGEIN 16
226 #define UMA_MD_SMALL_ALLOC
229 extern vm_paddr_t dmap_phys_base;
230 extern vm_paddr_t dmap_phys_max;
231 extern vm_offset_t dmap_max_addr;
232 extern u_int tsb_kernel_ldd_phys;
233 extern vm_offset_t vm_max_kernel_address;
234 extern vm_offset_t init_pt_va;
237 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
239 #define DEVMAP_MAX_VADDR VM_MAX_KERNEL_ADDRESS
241 #endif /* !_MACHINE_VMPARAM_H_ */