xref: /freebsd/sys/amd64/include/vmparam.h (revision bc96366c864c07ef352edb92017357917c75b36c)
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  * Copyright (c) 2003 Peter Wemm
7  * All rights reserved.
8  *
9  * This code is derived from software contributed to Berkeley by
10  * William Jolitz.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. All advertising materials mentioning features or use of this software
21  *    must display the following acknowledgement:
22  *	This product includes software developed by the University of
23  *	California, Berkeley and its contributors.
24  * 4. Neither the name of the University nor the names of its contributors
25  *    may be used to endorse or promote products derived from this software
26  *    without specific prior written permission.
27  *
28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38  * SUCH DAMAGE.
39  *
40  *	from: @(#)vmparam.h	5.9 (Berkeley) 5/12/91
41  * $FreeBSD$
42  */
43 
44 
45 #ifndef _MACHINE_VMPARAM_H_
46 #define	_MACHINE_VMPARAM_H_ 1
47 
48 /*
49  * Machine dependent constants for AMD64.
50  */
51 
52 /*
53  * Virtual memory related constants, all in bytes
54  */
55 #define	MAXTSIZ		(128UL*1024*1024)	/* max text size */
56 #ifndef DFLDSIZ
57 #define	DFLDSIZ		(32768UL*1024*1024)	/* initial data size limit */
58 #endif
59 #ifndef MAXDSIZ
60 #define	MAXDSIZ		(32768UL*1024*1024)	/* max data size */
61 #endif
62 #ifndef	DFLSSIZ
63 #define	DFLSSIZ		(8UL*1024*1024)		/* initial stack size limit */
64 #endif
65 #ifndef	MAXSSIZ
66 #define	MAXSSIZ		(512UL*1024*1024)	/* max stack size */
67 #endif
68 #ifndef SGROWSIZ
69 #define	SGROWSIZ	(128UL*1024)		/* amount to grow stack */
70 #endif
71 
72 /*
73  * We provide a machine specific single page allocator through the use
74  * of the direct mapped segment.  This uses 2MB pages for reduced
75  * TLB pressure.
76  */
77 #define	UMA_MD_SMALL_ALLOC
78 
79 /*
80  * The physical address space is densely populated.
81  */
82 #define	VM_PHYSSEG_DENSE
83 
84 /*
85  * The number of PHYSSEG entries must be one greater than the number
86  * of phys_avail entries because the phys_avail entry that spans the
87  * largest physical address that is accessible by ISA DMA is split
88  * into two PHYSSEG entries.
89  */
90 #define	VM_PHYSSEG_MAX		63
91 
92 /*
93  * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
94  * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
95  * the pool from which physical pages for page tables and small UMA
96  * objects are allocated.
97  */
98 #define	VM_NFREEPOOL		3
99 #define	VM_FREEPOOL_CACHE	2
100 #define	VM_FREEPOOL_DEFAULT	0
101 #define	VM_FREEPOOL_DIRECT	1
102 
103 /*
104  * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages
105  * that have physical addresses below 4G but are not accessible by ISA DMA,
106  * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA
107  * DMA.
108  */
109 #define	VM_NFREELIST		3
110 #define	VM_FREELIST_DEFAULT	0
111 #define	VM_FREELIST_DMA32	1
112 #define	VM_FREELIST_ISADMA	2
113 
114 /*
115  * Create the DMA32 free list only if the number of physical pages above
116  * physical address 4G is at least 16M, which amounts to 64GB of physical
117  * memory.
118  */
119 #define	VM_DMA32_NPAGES_THRESHOLD	16777216
120 
121 /*
122  * An allocation size of 16MB is supported in order to optimize the
123  * use of the direct map by UMA.  Specifically, a cache line contains
124  * at most 8 PDEs, collectively mapping 16MB of physical memory.  By
125  * reducing the number of distinct 16MB "pages" that are used by UMA,
126  * the physical memory allocator reduces the likelihood of both 2MB
127  * page TLB misses and cache misses caused by 2MB page TLB misses.
128  */
129 #define	VM_NFREEORDER		13
130 
131 /*
132  * Enable superpage reservations: 1 level.
133  */
134 #ifndef	VM_NRESERVLEVEL
135 #define	VM_NRESERVLEVEL		1
136 #endif
137 
138 /*
139  * Level 0 reservations consist of 512 pages.
140  */
141 #ifndef	VM_LEVEL_0_ORDER
142 #define	VM_LEVEL_0_ORDER	9
143 #endif
144 
145 #ifdef	SMP
146 #define	PA_LOCK_COUNT	256
147 #endif
148 
149 /*
150  * Virtual addresses of things.  Derived from the page directory and
151  * page table indexes from pmap.h for precision.
152  *
153  * 0x0000000000000000 - 0x00007fffffffffff   user map
154  * 0x0000800000000000 - 0xffff7fffffffffff   does not exist (hole)
155  * 0xffff800000000000 - 0xffff804020100fff   recursive page table (512GB slot)
156  * 0xffff804020101000 - 0xfffff7ffffffffff   unused
157  * 0xfffff80000000000 - 0xfffffbffffffffff   4TB direct map
158  * 0xfffffc0000000000 - 0xfffffdffffffffff   unused
159  * 0xfffffe0000000000 - 0xffffffffffffffff   2TB kernel map
160  *
161  * Within the kernel map:
162  *
163  * 0xffffffff80000000                        KERNBASE
164  */
165 
166 #define	VM_MIN_KERNEL_ADDRESS	KVADDR(KPML4BASE, 0, 0, 0)
167 #define	VM_MAX_KERNEL_ADDRESS	KVADDR(KPML4BASE + NKPML4E - 1, \
168 					NPDPEPG-1, NPDEPG-1, NPTEPG-1)
169 
170 #define	DMAP_MIN_ADDRESS	KVADDR(DMPML4I, 0, 0, 0)
171 #define	DMAP_MAX_ADDRESS	KVADDR(DMPML4I + NDMPML4E, 0, 0, 0)
172 
173 #define	KERNBASE		KVADDR(KPML4I, KPDPI, 0, 0)
174 
175 #define	UPT_MAX_ADDRESS		KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
176 #define	UPT_MIN_ADDRESS		KVADDR(PML4PML4I, 0, 0, 0)
177 
178 #define	VM_MAXUSER_ADDRESS	UVADDR(NUPML4E, 0, 0, 0)
179 
180 #define	SHAREDPAGE		(VM_MAXUSER_ADDRESS - PAGE_SIZE)
181 #define	USRSTACK		SHAREDPAGE
182 
183 #define	VM_MAX_ADDRESS		UPT_MAX_ADDRESS
184 #define	VM_MIN_ADDRESS		(0)
185 
186 /*
187  * XXX Allowing dmaplimit == 0 is a temporary workaround for vt(4) efifb's
188  * early use of PHYS_TO_DMAP before the mapping is actually setup. This works
189  * because the result is not actually accessed until later, but the early
190  * vt fb startup needs to be reworked.
191  */
192 #define	PHYS_TO_DMAP(x)	({						\
193 	KASSERT(dmaplimit == 0 || (x) < dmaplimit,			\
194 	    ("physical address %#jx not covered by the DMAP",		\
195 	    (uintmax_t)x));						\
196 	(x) | DMAP_MIN_ADDRESS; })
197 
198 #define	DMAP_TO_PHYS(x)	({						\
199 	KASSERT((x) < (DMAP_MIN_ADDRESS + dmaplimit) &&			\
200 	    (x) >= DMAP_MIN_ADDRESS,					\
201 	    ("virtual address %#jx not covered by the DMAP",		\
202 	    (uintmax_t)x));						\
203 	(x) & ~DMAP_MIN_ADDRESS; })
204 
205 /*
206  * How many physical pages per kmem arena virtual page.
207  */
208 #ifndef VM_KMEM_SIZE_SCALE
209 #define	VM_KMEM_SIZE_SCALE	(1)
210 #endif
211 
212 /*
213  * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
214  * kernel map.
215  */
216 #ifndef VM_KMEM_SIZE_MAX
217 #define	VM_KMEM_SIZE_MAX	((VM_MAX_KERNEL_ADDRESS - \
218     VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
219 #endif
220 
221 /* initial pagein size of beginning of executable file */
222 #ifndef VM_INITIAL_PAGEIN
223 #define	VM_INITIAL_PAGEIN	16
224 #endif
225 
226 #define	ZERO_REGION_SIZE	(2 * 1024 * 1024)	/* 2MB */
227 
228 #endif /* _MACHINE_VMPARAM_H_ */
229