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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
1d7f5b47 DG |
4 | * Copyright (c) 1994 John S. Dyson |
5 | * All rights reserved. | |
15637ed4 RG |
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. All advertising materials mentioning features or use of this software | |
19 | * must display the following acknowledgement: | |
20 | * This product includes software developed by the University of | |
21 | * California, Berkeley and its contributors. | |
22 | * 4. Neither the name of the University nor the names of its contributors | |
23 | * may be used to endorse or promote products derived from this software | |
24 | * without specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
36 | * SUCH DAMAGE. | |
37 | * | |
adc13511 | 38 | * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 |
4c321944 | 39 | * $Id: vmparam.h,v 1.11 1994/01/14 16:24:00 davidg Exp $ |
15637ed4 RG |
40 | */ |
41 | ||
42 | ||
126bd309 GW |
43 | #ifndef _MACHINE_VMPARAM_H_ |
44 | #define _MACHINE_VMPARAM_H_ 1 | |
45 | ||
15637ed4 RG |
46 | /* |
47 | * Machine dependent constants for 386. | |
48 | */ | |
49 | ||
50 | /* | |
51 | * Virtual address space arrangement. On 386, both user and kernel | |
52 | * share the address space, not unlike the vax. | |
53 | * USRTEXT is the start of the user text/data space, while USRSTACK | |
54 | * is the top (end) of the user stack. Immediately above the user stack | |
55 | * resides the user structure, which is UPAGES long and contains the | |
56 | * kernel stack. | |
57 | * | |
58 | * Immediately after the user structure is the page table map, and then | |
59 | * kernal address space. | |
60 | */ | |
fde1aeb2 | 61 | #define USRTEXT 0UL |
1d7f5b47 | 62 | /* #define USRSTACK 0xFDBFE000UL */ |
15637ed4 | 63 | #define BTOPUSRSTACK (0xFDC00-(UPAGES)) /* btop(USRSTACK) */ |
fde1aeb2 | 64 | #define LOWPAGES 0UL |
15637ed4 RG |
65 | #define HIGHPAGES UPAGES |
66 | ||
67 | /* | |
68 | * Virtual memory related constants, all in bytes | |
69 | */ | |
c97b55c1 | 70 | #define MAXTSIZ (16UL*1024*1024) /* max text size */ |
15637ed4 | 71 | #ifndef DFLDSIZ |
c97b55c1 | 72 | #define DFLDSIZ (64UL*1024*1024) /* initial data size limit */ |
15637ed4 RG |
73 | #endif |
74 | #ifndef MAXDSIZ | |
c97b55c1 | 75 | #define MAXDSIZ (128UL*1024*1024) /* max data size */ |
15637ed4 RG |
76 | #endif |
77 | #ifndef DFLSSIZ | |
4c321944 | 78 | #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ |
15637ed4 RG |
79 | #endif |
80 | #ifndef MAXSSIZ | |
c97b55c1 | 81 | #define MAXSSIZ (64UL*1024*1024) /* max stack size */ |
15637ed4 | 82 | #endif |
4c321944 DG |
83 | #ifndef SGROWSIZ |
84 | #define SGROWSIZ (128UL*1024) /* amount to grow stack */ | |
85 | #endif | |
15637ed4 RG |
86 | |
87 | /* | |
88 | * Default sizes of swap allocation chunks (see dmap.h). | |
89 | * The actual values may be changed in vminit() based on MAXDSIZ. | |
90 | * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024. | |
91 | */ | |
92 | #define DMMIN 32 /* smallest swap allocation */ | |
93 | #define DMMAX 4096 /* largest potential swap allocation */ | |
94 | #define DMTEXT 1024 /* swap allocation for text */ | |
95 | ||
96 | /* | |
97 | * Sizes of the system and user portions of the system page table. | |
98 | */ | |
99 | #define SYSPTSIZE (2*NPTEPG) | |
100 | #define USRPTSIZE (2*NPTEPG) | |
101 | ||
37186655 RG |
102 | /* |
103 | * Size of the Shared Memory Pages page table. | |
104 | */ | |
04595c74 | 105 | #ifndef SHMMAXPGS |
adc13511 | 106 | #define SHMMAXPGS 512 /* XXX until we have more kmap space */ |
37186655 RG |
107 | #endif |
108 | ||
15637ed4 RG |
109 | /* |
110 | * Size of User Raw I/O map | |
111 | */ | |
1d7f5b47 | 112 | #define USRIOSIZE 1024 |
15637ed4 RG |
113 | |
114 | /* | |
115 | * The size of the clock loop. | |
116 | */ | |
117 | #define LOOPPAGES (maxfree - firstfree) | |
118 | ||
119 | /* | |
120 | * The time for a process to be blocked before being very swappable. | |
121 | * This is a number of seconds which the system takes as being a non-trivial | |
122 | * amount of real time. You probably shouldn't change this; | |
123 | * it is used in subtle ways (fractions and multiples of it are, that is, like | |
124 | * half of a ``long time'', almost a long time, etc.) | |
125 | * It is related to human patience and other factors which don't really | |
126 | * change over time. | |
127 | */ | |
128 | #define MAXSLP 20 | |
129 | ||
130 | /* | |
131 | * A swapped in process is given a small amount of core without being bothered | |
132 | * by the page replacement algorithm. Basically this says that if you are | |
133 | * swapped in you deserve some resources. We protect the last SAFERSS | |
134 | * pages against paging and will just swap you out rather than paging you. | |
135 | * Note that each process has at least UPAGES+CLSIZE pages which are not | |
136 | * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this | |
137 | * number just means a swapped in process is given around 25k bytes. | |
138 | * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), | |
139 | * so we loan each swapped in process memory worth 100$, or just admit | |
140 | * that we don't consider it worthwhile and swap it out to disk which costs | |
141 | * $30/mb or about $0.75. | |
142 | * { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17 | |
143 | * on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) } | |
144 | */ | |
145 | #define SAFERSS 8 /* nominal ``small'' resident set size | |
146 | protected against replacement */ | |
147 | ||
148 | /* | |
149 | * DISKRPM is used to estimate the number of paging i/o operations | |
150 | * which one can expect from a single disk controller. | |
151 | */ | |
152 | #define DISKRPM 60 | |
153 | ||
154 | /* | |
155 | * Klustering constants. Klustering is the gathering | |
156 | * of pages together for pagein/pageout, while clustering | |
157 | * is the treatment of hardware page size as though it were | |
158 | * larger than it really is. | |
159 | * | |
160 | * KLMAX gives maximum cluster size in CLSIZE page (cluster-page) | |
161 | * units. Note that KLMAX*CLSIZE must be <= DMMIN in dmap.h. | |
162 | */ | |
163 | ||
164 | #define KLMAX (4/CLSIZE) | |
165 | #define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */ | |
166 | #define KLIN (4/CLSIZE) /* default data/stack in klust */ | |
167 | #define KLTXT (4/CLSIZE) /* default text in klust */ | |
168 | #define KLOUT (4/CLSIZE) | |
169 | ||
170 | /* | |
171 | * KLSDIST is the advance or retard of the fifo reclaim for sequential | |
172 | * processes data space. | |
173 | */ | |
174 | #define KLSDIST 3 /* klusters advance/retard for seq. fifo */ | |
175 | ||
176 | /* | |
177 | * Paging thresholds (see vm_sched.c). | |
178 | * Strategy of 1/19/85: | |
179 | * lotsfree is 512k bytes, but at most 1/4 of memory | |
180 | * desfree is 200k bytes, but at most 1/8 of memory | |
181 | * minfree is 64k bytes, but at most 1/2 of desfree | |
182 | */ | |
183 | #define LOTSFREE (512 * 1024) | |
184 | #define LOTSFREEFRACT 4 | |
185 | #define DESFREE (200 * 1024) | |
186 | #define DESFREEFRACT 8 | |
187 | #define MINFREE (64 * 1024) | |
188 | #define MINFREEFRACT 2 | |
189 | ||
190 | /* | |
191 | * There are two clock hands, initially separated by HANDSPREAD bytes | |
192 | * (but at most all of user memory). The amount of time to reclaim | |
193 | * a page once the pageout process examines it increases with this | |
194 | * distance and decreases as the scan rate rises. | |
195 | */ | |
196 | #define HANDSPREAD (2 * 1024 * 1024) | |
197 | ||
198 | /* | |
199 | * The number of times per second to recompute the desired paging rate | |
200 | * and poke the pagedaemon. | |
201 | */ | |
202 | #define RATETOSCHEDPAGING 4 | |
203 | ||
204 | /* | |
205 | * Believed threshold (in megabytes) for which interleaved | |
206 | * swapping area is desirable. | |
207 | */ | |
208 | #define LOTSOFMEM 2 | |
209 | ||
210 | #define mapin(pte, v, pfnum, prot) \ | |
211 | {(*(int *)(pte) = ((pfnum)<<PGSHIFT) | (prot)) ; } | |
212 | ||
213 | /* | |
214 | * Mach derived constants | |
215 | */ | |
216 | ||
217 | /* user/kernel map constants */ | |
1d7f5b47 DG |
218 | #define KERNBASE (0-(NKPDE+1)*(NBPG*NPTEPG)) |
219 | #define KERNSIZE (NKPDE*NBPG*NPTEPG) | |
220 | ||
15637ed4 | 221 | #define VM_MIN_ADDRESS ((vm_offset_t)0) |
1d7f5b47 DG |
222 | #define VM_MAXUSER_ADDRESS ((vm_offset_t)KERNBASE - (NBPG*(NPTEPG+UPAGES))) |
223 | #define USRSTACK VM_MAXUSER_ADDRESS | |
224 | #define UPT_MIN_ADDRESS ((vm_offset_t)KERNBASE - (NBPG*NPTEPG)) | |
225 | #define UPT_MAX_ADDRESS ((vm_offset_t)KERNBASE - (NBPG*(NKPDE+2))) | |
15637ed4 | 226 | #define VM_MAX_ADDRESS UPT_MAX_ADDRESS |
1d7f5b47 | 227 | #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE - (NBPG*(NKPDE+2))) |
15637ed4 | 228 | #define UPDT VM_MIN_KERNEL_ADDRESS |
1d7f5b47 DG |
229 | #define KPT_MIN_ADDRESS ((vm_offset_t)(KERNBASE) - (NBPG*(NKPDE+1))) |
230 | #define KPT_MAX_ADDRESS ((vm_offset_t)(KERNBASE) - NBPG) | |
231 | #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)ALT_MIN_ADDRESS - NBPG) | |
232 | #define ALT_MIN_ADDRESS ((vm_offset_t)((APTDPTDI) << 22)) | |
233 | #define HIGHPAGES UPAGES | |
234 | ||
15637ed4 RG |
235 | |
236 | /* virtual sizes (bytes) for various kernel submaps */ | |
237 | #define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) | |
adc13511 | 238 | #define VM_KMEM_SIZE (16 * 1024 * 1024) |
15637ed4 RG |
239 | #define VM_PHYS_SIZE (USRIOSIZE*CLBYTES) |
240 | ||
15637ed4 RG |
241 | /* pcb base */ |
242 | #define pcbb(p) ((u_int)(p)->p_addr) | |
243 | ||
244 | /* | |
245 | * Flush MMU TLB | |
246 | */ | |
247 | ||
248 | #ifndef I386_CR3PAT | |
249 | #define I386_CR3PAT 0x0 | |
250 | #endif | |
251 | ||
252 | #ifdef notyet | |
253 | #define _cr3() ({u_long rtn; \ | |
254 | asm (" movl %%cr3,%%eax; movl %%eax,%0 " \ | |
255 | : "=g" (rtn) \ | |
256 | : \ | |
257 | : "ax"); \ | |
258 | rtn; \ | |
259 | }) | |
260 | ||
261 | #define load_cr3(s) ({ u_long val; \ | |
262 | val = (s) | I386_CR3PAT; \ | |
263 | asm ("movl %0,%%eax; movl %%eax,%%cr3" \ | |
264 | : \ | |
265 | : "g" (val) \ | |
266 | : "ax"); \ | |
267 | }) | |
268 | ||
269 | #define tlbflush() ({ u_long val; \ | |
270 | val = u.u_pcb.pcb_ptd | I386_CR3PAT; \ | |
271 | asm ("movl %0,%%eax; movl %%eax,%%cr3" \ | |
272 | : \ | |
273 | : "g" (val) \ | |
274 | : "ax"); \ | |
275 | }) | |
276 | #endif | |
126bd309 | 277 | #endif /* _MACHINE_VMPARAM_H_ */ |