xref: /freebsd/sys/riscv/include/vmparam.h (revision 7029da5c36f2d3cf6bb6c81bf551229f416399e8)
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.
71  */
72 #define	VM_PHYSSEG_MAX		64
73 
74 /*
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
78  * allocated.
79  */
80 #define	VM_NFREEPOOL		2
81 #define	VM_FREEPOOL_DEFAULT	0
82 #define	VM_FREEPOOL_DIRECT	1
83 
84 /*
85  * Create one free page list: VM_FREELIST_DEFAULT is for all physical
86  * pages.
87  */
88 #define	VM_NFREELIST		1
89 #define	VM_FREELIST_DEFAULT	0
90 
91 /*
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.
98  */
99 #define	VM_NFREEORDER		12
100 
101 /*
102  * Enable superpage reservations: 1 level.
103  */
104 #ifndef	VM_NRESERVLEVEL
105 #define	VM_NRESERVLEVEL		1
106 #endif
107 
108 /*
109  * Level 0 reservations consist of 512 pages.
110  */
111 #ifndef	VM_LEVEL_0_ORDER
112 #define	VM_LEVEL_0_ORDER	9
113 #endif
114 
115 /**
116  * Address space layout.
117  *
118  * RISC-V implements multiple paging modes with different virtual address space
119  * sizes: SV32, SV39 and SV48.  SV39 permits a virtual address space size of
120  * 512GB and uses a three-level page table.  Since this is large enough for most
121  * purposes, we currently use SV39 for both userland and the kernel, avoiding
122  * the extra translation step required by SV48.
123  *
124  * The address space is split into two regions at each end of the 64-bit address
125  * space:
126  *
127  * 0x0000000000000000 - 0x0000003fffffffff    256GB user map
128  * 0x0000004000000000 - 0xffffffbfffffffff    unmappable
129  * 0xffffffc000000000 - 0xffffffc7ffffffff    32GB kernel map
130  * 0xffffffc800000000 - 0xffffffcfffffffff    32GB unused
131  * 0xffffffd000000000 - 0xffffffefffffffff    128GB direct map
132  * 0xfffffff000000000 - 0xffffffffffffffff    64GB unused
133  *
134  * The kernel is loaded at the beginning of the kernel map.
135  *
136  * We define some interesting address constants:
137  *
138  * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
139  * 64 bit address space, mostly just for convenience.
140  *
141  * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
142  * mappable kernel virtual address space.
143  *
144  * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
145  * user address space.
146  */
147 #define	VM_MIN_ADDRESS		(0x0000000000000000UL)
148 #define	VM_MAX_ADDRESS		(0xffffffffffffffffUL)
149 
150 #define	VM_MIN_KERNEL_ADDRESS	(0xffffffc000000000UL)
151 #define	VM_MAX_KERNEL_ADDRESS	(0xffffffc800000000UL)
152 
153 #define	DMAP_MIN_ADDRESS	(0xffffffd000000000UL)
154 #define	DMAP_MAX_ADDRESS	(0xfffffff000000000UL)
155 
156 #define	DMAP_MIN_PHYSADDR	(dmap_phys_base)
157 #define	DMAP_MAX_PHYSADDR	(dmap_phys_max)
158 
159 /* True if pa is in the dmap range */
160 #define	PHYS_IN_DMAP(pa)	((pa) >= DMAP_MIN_PHYSADDR && \
161     (pa) < DMAP_MAX_PHYSADDR)
162 /* True if va is in the dmap range */
163 #define	VIRT_IN_DMAP(va)	((va) >= DMAP_MIN_ADDRESS && \
164     (va) < (dmap_max_addr))
165 
166 #define	PMAP_HAS_DMAP	1
167 #define	PHYS_TO_DMAP(pa)						\
168 ({									\
169 	KASSERT(PHYS_IN_DMAP(pa),					\
170 	    ("%s: PA out of range, PA: 0x%lx", __func__,		\
171 	    (vm_paddr_t)(pa)));						\
172 	((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS;			\
173 })
174 
175 #define	DMAP_TO_PHYS(va)						\
176 ({									\
177 	KASSERT(VIRT_IN_DMAP(va),					\
178 	    ("%s: VA out of range, VA: 0x%lx", __func__,		\
179 	    (vm_offset_t)(va)));					\
180 	((va) - DMAP_MIN_ADDRESS) + dmap_phys_base;			\
181 })
182 
183 #define	VM_MIN_USER_ADDRESS	(0x0000000000000000UL)
184 #define	VM_MAX_USER_ADDRESS	(0x0000004000000000UL)
185 
186 #define	VM_MINUSER_ADDRESS	(VM_MIN_USER_ADDRESS)
187 #define	VM_MAXUSER_ADDRESS	(VM_MAX_USER_ADDRESS)
188 
189 #define	KERNBASE		(VM_MIN_KERNEL_ADDRESS)
190 #define	SHAREDPAGE		(VM_MAXUSER_ADDRESS - PAGE_SIZE)
191 #define	USRSTACK		SHAREDPAGE
192 
193 #define	KERNENTRY		(0)
194 
195 /*
196  * How many physical pages per kmem arena virtual page.
197  */
198 #ifndef VM_KMEM_SIZE_SCALE
199 #define	VM_KMEM_SIZE_SCALE	(3)
200 #endif
201 
202 /*
203  * Optional floor (in bytes) on the size of the kmem arena.
204  */
205 #ifndef VM_KMEM_SIZE_MIN
206 #define	VM_KMEM_SIZE_MIN	(16 * 1024 * 1024)
207 #endif
208 
209 /*
210  * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
211  * kernel map.
212  */
213 #ifndef VM_KMEM_SIZE_MAX
214 #define	VM_KMEM_SIZE_MAX	((VM_MAX_KERNEL_ADDRESS - \
215     VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
216 #endif
217 
218 /*
219  * Initial pagein size of beginning of executable file.
220  */
221 #ifndef	VM_INITIAL_PAGEIN
222 #define	VM_INITIAL_PAGEIN	16
223 #endif
224 
225 #define	UMA_MD_SMALL_ALLOC
226 
227 #ifndef LOCORE
228 extern vm_paddr_t dmap_phys_base;
229 extern vm_paddr_t dmap_phys_max;
230 extern vm_offset_t dmap_max_addr;
231 extern vm_offset_t vm_max_kernel_address;
232 extern vm_offset_t init_pt_va;
233 #endif
234 
235 #define	ZERO_REGION_SIZE	(64 * 1024)	/* 64KB */
236 
237 #define	DEVMAP_MAX_VADDR	VM_MAX_KERNEL_ADDRESS
238 
239 #endif /* !_MACHINE_VMPARAM_H_ */
240