1 /*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 * Copyright (c) 1994 John S. Dyson
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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.
21 *
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)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
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
36 * $FreeBSD$
37 */
38
39 #ifndef _MACHINE_VMPARAM_H_
40 #define _MACHINE_VMPARAM_H_
41
42 /*
43 * Virtual memory related constants, all in bytes
44 */
45 #ifndef MAXTSIZ
46 #define MAXTSIZ (1*1024*1024*1024) /* max text size */
47 #endif
48 #ifndef DFLDSIZ
49 #define DFLDSIZ (128*1024*1024) /* initial data size limit */
50 #endif
51 #ifndef MAXDSIZ
52 #define MAXDSIZ (1*1024*1024*1024) /* max data size */
53 #endif
54 #ifndef DFLSSIZ
55 #define DFLSSIZ (128*1024*1024) /* initial stack size limit */
56 #endif
57 #ifndef MAXSSIZ
58 #define MAXSSIZ (1*1024*1024*1024) /* max stack size */
59 #endif
60 #ifndef SGROWSIZ
61 #define SGROWSIZ (128*1024) /* amount to grow stack */
62 #endif
63
64 /*
65 * The physical address space is sparsely populated.
66 */
67 #define VM_PHYSSEG_SPARSE
68
69 /*
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.
74 */
75 #define VM_PHYSSEG_MAX 64
76
77 /*
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
81 * allocated.
82 */
83 #define VM_NFREEPOOL 2
84 #define VM_FREEPOOL_DEFAULT 0
85 #define VM_FREEPOOL_DIRECT 1
86
87 /*
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.
92 */
93 #define VM_NFREELIST 2
94 #define VM_FREELIST_DEFAULT 0
95 #define VM_FREELIST_ISADMA 1
96
97 /*
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.
104 */
105 #define VM_NFREEORDER 12
106
107 /*
108 * Enable superpage reservations: 1 level.
109 */
110 #ifndef VM_NRESERVLEVEL
111 #define VM_NRESERVLEVEL 1
112 #endif
113
114 /*
115 * Level 0 reservations consist of 512 pages.
116 */
117 #ifndef VM_LEVEL_0_ORDER
118 #define VM_LEVEL_0_ORDER 9
119 #endif
120
121 /**
122 * Address space layout.
123 *
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.
127 *
128 * We limit the size of the two spaces to 39 bits each.
129 *
130 * Upper region: 0xffffffffffffffff
131 * 0xffffff8000000000
132 *
133 * Hole: 0xffffff7fffffffff
134 * 0x0000008000000000
135 *
136 * Lower region: 0x0000007fffffffff
137 * 0x0000000000000000
138 *
139 * We use the upper region for the kernel, and the lower region for userland.
140 *
141 * We define some interesting address constants:
142 *
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.
145 *
146 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
147 * mappable kernel virtual address space.
148 *
149 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
150 * user address space.
151 */
152 #define VM_MIN_ADDRESS (0x0000000000000000UL)
153 #define VM_MAX_ADDRESS (0xffffffffffffffffUL)
154
155 /* 32 GiB of kernel addresses */
156 #define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
157 #define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)
158
159 /* Direct Map for 128 GiB of PA: 0x0 - 0x1fffffffff */
160 #define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
161 #define DMAP_MAX_ADDRESS (0xffffffefffffffffUL)
162
163 #define DMAP_MIN_PHYSADDR (0x0000000000000000UL)
164 #define DMAP_MAX_PHYSADDR (DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS)
165
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_ADDRESS)
172
173 #define PHYS_TO_DMAP(pa) \
174 ({ \
175 KASSERT(PHYS_IN_DMAP(pa), \
176 ("%s: PA out of range, PA: 0x%lx", __func__, \
177 (vm_paddr_t)(pa))); \
178 (pa) | DMAP_MIN_ADDRESS; \
179 })
180
181 #define DMAP_TO_PHYS(va) \
182 ({ \
183 KASSERT(VIRT_IN_DMAP(va), \
184 ("%s: VA out of range, VA: 0x%lx", __func__, \
185 (vm_offset_t)(va))); \
186 (va) & ~DMAP_MIN_ADDRESS; \
187 })
188
189 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
190 #define VM_MAX_USER_ADDRESS (0x0000004000000000UL)
191
192 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
193 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
194
195 #define KERNBASE (VM_MIN_KERNEL_ADDRESS)
196 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
197 #define USRSTACK SHAREDPAGE
198
199 #define KERNENTRY (0x200)
200
201 /*
202 * How many physical pages per kmem arena virtual page.
203 */
204 #ifndef VM_KMEM_SIZE_SCALE
205 #define VM_KMEM_SIZE_SCALE (3)
206 #endif
207
208 /*
209 * Optional floor (in bytes) on the size of the kmem arena.
210 */
211 #ifndef VM_KMEM_SIZE_MIN
212 #define VM_KMEM_SIZE_MIN (16 * 1024 * 1024)
213 #endif
214
215 /*
216 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
217 * kernel map.
218 */
219 #ifndef VM_KMEM_SIZE_MAX
220 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
221 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
222 #endif
223
224 /*
225 * Initial pagein size of beginning of executable file.
226 */
227 #ifndef VM_INITIAL_PAGEIN
228 #define VM_INITIAL_PAGEIN 16
229 #endif
230
231 /*
232 * RISCVTODO
233 * #define UMA_MD_SMALL_ALLOC
234 */
235
236 extern u_int tsb_kernel_ldd_phys;
237 extern vm_offset_t vm_max_kernel_address;
238 extern vm_offset_t init_pt_va;
239
240 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
241
242 #define DEVMAP_MAX_VADDR VM_MAX_KERNEL_ADDRESS
243
244 #endif /* !_MACHINE_VMPARAM_H_ */
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