FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_param.h
1 /* $NetBSD: uvm_param.h,v 1.19 2004/04/04 18:21:49 pk Exp $ */
2
3 /*
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * The Mach Operating System project at Carnegie-Mellon University.
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 * @(#)vm_param.h 8.2 (Berkeley) 1/9/95
35 *
36 *
37 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
38 * All rights reserved.
39 *
40 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
41 *
42 * Permission to use, copy, modify and distribute this software and
43 * its documentation is hereby granted, provided that both the copyright
44 * notice and this permission notice appear in all copies of the
45 * software, derivative works or modified versions, and any portions
46 * thereof, and that both notices appear in supporting documentation.
47 *
48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
50 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
51 *
52 * Carnegie Mellon requests users of this software to return to
53 *
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
58 *
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
61 */
62
63 /*
64 * Machine independent virtual memory parameters.
65 */
66
67 #ifndef _VM_PARAM_
68 #define _VM_PARAM_
69
70 #ifdef _KERNEL_OPT
71 #include "opt_uvm.h"
72 #endif
73 #ifdef _KERNEL
74 #include <machine/vmparam.h>
75 #include <sys/resourcevar.h>
76 #endif
77
78 #if defined(_KERNEL)
79
80 #if defined(PAGE_SIZE)
81
82 /*
83 * If PAGE_SIZE is defined at this stage, it must be a constant.
84 */
85
86 #if PAGE_SIZE == 0
87 #error Invalid PAGE_SIZE definition
88 #endif
89
90 /*
91 * If the platform does not need to support a variable PAGE_SIZE,
92 * then provide default values for MIN_PAGE_SIZE and MAX_PAGE_SIZE.
93 */
94
95 #if !defined(MIN_PAGE_SIZE)
96 #define MIN_PAGE_SIZE PAGE_SIZE
97 #endif /* ! MIN_PAGE_SIZE */
98
99 #if !defined(MAX_PAGE_SIZE)
100 #define MAX_PAGE_SIZE PAGE_SIZE
101 #endif /* ! MAX_PAGE_SIZE */
102
103 #else /* ! PAGE_SIZE */
104
105 /*
106 * PAGE_SIZE is not a constant; MIN_PAGE_SIZE and MAX_PAGE_SIZE must
107 * be defined.
108 */
109
110 #if !defined(MIN_PAGE_SIZE)
111 #error MIN_PAGE_SIZE not defined
112 #endif
113
114 #if !defined(MAX_PAGE_SIZE)
115 #error MAX_PAGE_SIZE not defined
116 #endif
117
118 #endif /* PAGE_SIZE */
119
120 /*
121 * MIN_PAGE_SIZE and MAX_PAGE_SIZE must be constants.
122 */
123
124 #if MIN_PAGE_SIZE == 0
125 #error Invalid MIN_PAGE_SIZE definition
126 #endif
127
128 #if MAX_PAGE_SIZE == 0
129 #error Invalid MAX_PAGE_SIZE definition
130 #endif
131
132 /*
133 * If MIN_PAGE_SIZE and MAX_PAGE_SIZE are not equal, then we must use
134 * non-constant PAGE_SIZE, et al for LKMs.
135 */
136 #if (MIN_PAGE_SIZE != MAX_PAGE_SIZE) && defined(_LKM)
137 #undef PAGE_SIZE
138 #undef PAGE_MASK
139 #undef PAGE_SHIFT
140 #endif
141
142 /*
143 * Now provide PAGE_SIZE, PAGE_MASK, and PAGE_SHIFT if we do not
144 * have ones that are compile-time constants.
145 */
146 #if !defined(PAGE_SIZE)
147 #define PAGE_SIZE uvmexp.pagesize /* size of page */
148 #define PAGE_MASK uvmexp.pagemask /* size of page - 1 */
149 #define PAGE_SHIFT uvmexp.pageshift /* bits to shift for pages */
150 #endif /* PAGE_SIZE */
151
152 #endif /* _KERNEL */
153
154 /*
155 * CTL_VM identifiers
156 */
157 #define VM_METER 1 /* struct vmmeter */
158 #define VM_LOADAVG 2 /* struct loadavg */
159 #define VM_UVMEXP 3 /* struct uvmexp */
160 #define VM_NKMEMPAGES 4 /* kmem_map pages */
161 #define VM_UVMEXP2 5 /* struct uvmexp_sysctl */
162 #define VM_ANONMIN 6
163 #define VM_EXECMIN 7
164 #define VM_FILEMIN 8
165 #define VM_MAXSLP 9
166 #define VM_USPACE 10
167 #define VM_ANONMAX 11
168 #define VM_EXECMAX 12
169 #define VM_FILEMAX 13
170
171 #define VM_MAXID 14 /* number of valid vm ids */
172
173 #define CTL_VM_NAMES { \
174 { 0, 0 }, \
175 { "vmmeter", CTLTYPE_STRUCT }, \
176 { "loadavg", CTLTYPE_STRUCT }, \
177 { "uvmexp", CTLTYPE_STRUCT }, \
178 { "nkmempages", CTLTYPE_INT }, \
179 { "uvmexp2", CTLTYPE_STRUCT }, \
180 { "anonmin", CTLTYPE_INT }, \
181 { "execmin", CTLTYPE_INT }, \
182 { "filemin", CTLTYPE_INT }, \
183 { "maxslp", CTLTYPE_INT }, \
184 { "uspace", CTLTYPE_INT }, \
185 { "anonmax", CTLTYPE_INT }, \
186 { "execmax", CTLTYPE_INT }, \
187 { "filemax", CTLTYPE_INT }, \
188 }
189
190 #ifndef ASSEMBLER
191 /*
192 * Convert addresses to pages and vice versa.
193 * No rounding is used.
194 */
195 #ifdef _KERNEL
196 #define atop(x) (((paddr_t)(x)) >> PAGE_SHIFT)
197 #define ptoa(x) ((vaddr_t)((vaddr_t)(x) << PAGE_SHIFT))
198
199 /*
200 * Round off or truncate to the nearest page. These will work
201 * for either addresses or counts (i.e., 1 byte rounds to 1 page).
202 */
203 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
204 #define trunc_page(x) ((x) & ~PAGE_MASK)
205
206 /*
207 * Set up the default mapping address (VM_DEFAULT_ADDRESS) according to:
208 *
209 * USE_TOPDOWN_VM: a kernel option to enable on a per-kernel basis
210 * which only be used on ports that define...
211 * __HAVE_TOPDOWN_VM: a per-port option to offer the topdown option
212 *
213 * __USE_TOPDOWN_VM: a per-port option to unconditionally use it
214 *
215 * if __USE_TOPDOWN_VM is defined, the port can specify a default vm
216 * address, or we will use the topdown default from below. If it is
217 * NOT defined, then the port can offer topdown as an option, but it
218 * MUST define the VM_DEFAULT_ADDRESS macro itself.
219 */
220 #if defined(USE_TOPDOWN_VM) || defined(__USE_TOPDOWN_VM)
221 # if !defined(__HAVE_TOPDOWN_VM) && !defined(__USE_TOPDOWN_VM)
222 # error "Top down memory allocation not enabled for this system"
223 # else /* !__HAVE_TOPDOWN_VM && !__USE_TOPDOWN_VM */
224 # define __USING_TOPDOWN_VM
225 # if !defined(VM_DEFAULT_ADDRESS)
226 # if !defined(__USE_TOPDOWN_VM)
227 # error "Top down memory allocation not configured for this system"
228 # else /* !__USE_TOPDOWN_VM */
229 # define VM_DEFAULT_ADDRESS(da, sz) \
230 trunc_page(VM_MAXUSER_ADDRESS - MAXSSIZ - (sz))
231 # endif /* !__USE_TOPDOWN_VM */
232 # endif /* !VM_DEFAULT_ADDRESS */
233 # endif /* !__HAVE_TOPDOWN_VM && !__USE_TOPDOWN_VM */
234 #endif /* USE_TOPDOWN_VM || __USE_TOPDOWN_VM */
235
236 #if !defined(__USING_TOPDOWN_VM)
237 # if defined(VM_DEFAULT_ADDRESS)
238 # error "Default vm address should not be defined here"
239 # else /* VM_DEFAULT_ADDRESS */
240 # define VM_DEFAULT_ADDRESS(da, sz) round_page((vaddr_t)(da) + (vsize_t)maxdmap)
241 # endif /* VM_DEFAULT_ADDRESS */
242 #endif /* !__USING_TOPDOWN_VM */
243
244 extern int ubc_nwins; /* number of UBC mapping windows */
245 extern int ubc_winshift; /* shift for a UBC mapping window */
246
247 #else
248 /* out-of-kernel versions of round_page and trunc_page */
249 #define round_page(x) \
250 ((((vaddr_t)(x) + (vm_page_size - 1)) / vm_page_size) * \
251 vm_page_size)
252 #define trunc_page(x) \
253 ((((vaddr_t)(x)) / vm_page_size) * vm_page_size)
254
255 #endif /* _KERNEL */
256 #endif /* ASSEMBLER */
257 #endif /* _VM_PARAM_ */
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