1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
37 * $Id$
38 */
39
40
41/*
42 * Machine dependent constants for 386.
43 */
44
45/*
46 * Virtual address space arrangement. On 386, both user and kernel
47 * share the address space, not unlike the vax.
48 * USRTEXT is the start of the user text/data space, while USRSTACK
49 * is the top (end) of the user stack. Immediately above the user stack
50 * resides the user structure, which is UPAGES long and contains the
51 * kernel stack.
52 *
53 * Immediately after the user structure is the page table map, and then
54 * kernal address space.
55 */
56#define USRTEXT 0
57#define USRSTACK 0xFDBFE000
58#define BTOPUSRSTACK (0xFDC00-(UPAGES)) /* btop(USRSTACK) */
59#define LOWPAGES 0
60#define HIGHPAGES UPAGES
61
62/*
63 * Virtual memory related constants, all in bytes
64 */
65#define MAXTSIZ (6*1024*1024) /* max text size */
66#ifndef DFLDSIZ
67#define DFLDSIZ (16*1024*1024) /* initial data size limit */
68#endif
69#ifndef MAXDSIZ
70#define MAXDSIZ (32*1024*1024) /* max data size */
71#endif
72#ifndef DFLSSIZ
73#define DFLSSIZ (512*1024) /* initial stack size limit */
74#endif
75#ifndef MAXSSIZ
76#define MAXSSIZ (8*1024*1024) /* max stack size */
77#endif
78
79/*
80 * Default sizes of swap allocation chunks (see dmap.h).
81 * The actual values may be changed in vminit() based on MAXDSIZ.
82 * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
83 */
84#define DMMIN 32 /* smallest swap allocation */
85#define DMMAX 4096 /* largest potential swap allocation */
86#define DMTEXT 1024 /* swap allocation for text */
87
88/*
89 * Sizes of the system and user portions of the system page table.
90 */
91#define SYSPTSIZE (2*NPTEPG)
92#define USRPTSIZE (2*NPTEPG)
93
94/*
95 * Size of the Shared Memory Pages page table.
96 */
97#ifndef SHMMAXPGS
98#define SHMMAXPGS 512 /* XXX until we have more kmap space */
99#endif
100
101/*
102 * Size of User Raw I/O map
103 */
104#define USRIOSIZE 300
105
106/*
107 * The size of the clock loop.
108 */
109#define LOOPPAGES (maxfree - firstfree)
110
111/*
112 * The time for a process to be blocked before being very swappable.
113 * This is a number of seconds which the system takes as being a non-trivial
114 * amount of real time. You probably shouldn't change this;
115 * it is used in subtle ways (fractions and multiples of it are, that is, like
116 * half of a ``long time'', almost a long time, etc.)
117 * It is related to human patience and other factors which don't really
118 * change over time.
119 */
120#define MAXSLP 20
121
122/*
123 * A swapped in process is given a small amount of core without being bothered
124 * by the page replacement algorithm. Basically this says that if you are
125 * swapped in you deserve some resources. We protect the last SAFERSS
126 * pages against paging and will just swap you out rather than paging you.
127 * Note that each process has at least UPAGES+CLSIZE pages which are not
128 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
129 * number just means a swapped in process is given around 25k bytes.
130 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
131 * so we loan each swapped in process memory worth 100$, or just admit
132 * that we don't consider it worthwhile and swap it out to disk which costs
133 * $30/mb or about $0.75.
134 * { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17
135 * on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) }
136 */
137#define SAFERSS 8 /* nominal ``small'' resident set size
138 protected against replacement */
139
140/*
141 * DISKRPM is used to estimate the number of paging i/o operations
142 * which one can expect from a single disk controller.
143 */
144#define DISKRPM 60
145
146/*
147 * Klustering constants. Klustering is the gathering
148 * of pages together for pagein/pageout, while clustering
149 * is the treatment of hardware page size as though it were
150 * larger than it really is.
151 *
152 * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
153 * units. Note that KLMAX*CLSIZE must be <= DMMIN in dmap.h.
154 */
155
156#define KLMAX (4/CLSIZE)
157#define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */
158#define KLIN (4/CLSIZE) /* default data/stack in klust */
159#define KLTXT (4/CLSIZE) /* default text in klust */
160#define KLOUT (4/CLSIZE)
161
162/*
163 * KLSDIST is the advance or retard of the fifo reclaim for sequential
164 * processes data space.
165 */
166#define KLSDIST 3 /* klusters advance/retard for seq. fifo */
167
168/*
169 * Paging thresholds (see vm_sched.c).
170 * Strategy of 1/19/85:
171 * lotsfree is 512k bytes, but at most 1/4 of memory
172 * desfree is 200k bytes, but at most 1/8 of memory
173 * minfree is 64k bytes, but at most 1/2 of desfree
174 */
175#define LOTSFREE (512 * 1024)
176#define LOTSFREEFRACT 4
177#define DESFREE (200 * 1024)
178#define DESFREEFRACT 8
179#define MINFREE (64 * 1024)
180#define MINFREEFRACT 2
181
182/*
183 * There are two clock hands, initially separated by HANDSPREAD bytes
184 * (but at most all of user memory). The amount of time to reclaim
185 * a page once the pageout process examines it increases with this
186 * distance and decreases as the scan rate rises.
187 */
188#define HANDSPREAD (2 * 1024 * 1024)
189
190/*
191 * The number of times per second to recompute the desired paging rate
192 * and poke the pagedaemon.
193 */
194#define RATETOSCHEDPAGING 4
195
196/*
197 * Believed threshold (in megabytes) for which interleaved
198 * swapping area is desirable.
199 */
200#define LOTSOFMEM 2
201
202#define mapin(pte, v, pfnum, prot) \
203 {(*(int *)(pte) = ((pfnum)<<PGSHIFT) | (prot)) ; }
204
205/*
206 * Mach derived constants
207 */
208
209/* user/kernel map constants */
210#define VM_MIN_ADDRESS ((vm_offset_t)0)
211#define VM_MAXUSER_ADDRESS ((vm_offset_t)0xFDBFE000)
212#define UPT_MIN_ADDRESS ((vm_offset_t)0xFDC00000)
213#define UPT_MAX_ADDRESS ((vm_offset_t)0xFDFF7000)
214#define VM_MAX_ADDRESS UPT_MAX_ADDRESS
215#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xFDFF7000)
216#define UPDT VM_MIN_KERNEL_ADDRESS
217#define KPT_MIN_ADDRESS ((vm_offset_t)0xFDFF8000)
218#define KPT_MAX_ADDRESS ((vm_offset_t)0xFDFFF000)
219#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFF7FF000)
220
221/* virtual sizes (bytes) for various kernel submaps */
222#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
223#define VM_KMEM_SIZE (16 * 1024 * 1024)
224#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
225
226/* pcb base */
227#define pcbb(p) ((u_int)(p)->p_addr)
228
229/*
230 * Flush MMU TLB
231 */
232
233#ifndef I386_CR3PAT
234#define I386_CR3PAT 0x0
235#endif
236
237#ifdef notyet
238#define _cr3() ({u_long rtn; \
239 asm (" movl %%cr3,%%eax; movl %%eax,%0 " \
240 : "=g" (rtn) \
241 : \
242 : "ax"); \
243 rtn; \
244})
245
246#define load_cr3(s) ({ u_long val; \
247 val = (s) | I386_CR3PAT; \
248 asm ("movl %0,%%eax; movl %%eax,%%cr3" \
249 : \
250 : "g" (val) \
251 : "ax"); \
252})
253
254#define tlbflush() ({ u_long val; \
255 val = u.u_pcb.pcb_ptd | I386_CR3PAT; \
256 asm ("movl %0,%%eax; movl %%eax,%%cr3" \
257 : \
258 : "g" (val) \
259 : "ax"); \
260})
261#endif
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
37 * $Id$
38 */
39
40
41/*
42 * Machine dependent constants for 386.
43 */
44
45/*
46 * Virtual address space arrangement. On 386, both user and kernel
47 * share the address space, not unlike the vax.
48 * USRTEXT is the start of the user text/data space, while USRSTACK
49 * is the top (end) of the user stack. Immediately above the user stack
50 * resides the user structure, which is UPAGES long and contains the
51 * kernel stack.
52 *
53 * Immediately after the user structure is the page table map, and then
54 * kernal address space.
55 */
56#define USRTEXT 0
57#define USRSTACK 0xFDBFE000
58#define BTOPUSRSTACK (0xFDC00-(UPAGES)) /* btop(USRSTACK) */
59#define LOWPAGES 0
60#define HIGHPAGES UPAGES
61
62/*
63 * Virtual memory related constants, all in bytes
64 */
65#define MAXTSIZ (6*1024*1024) /* max text size */
66#ifndef DFLDSIZ
67#define DFLDSIZ (16*1024*1024) /* initial data size limit */
68#endif
69#ifndef MAXDSIZ
70#define MAXDSIZ (32*1024*1024) /* max data size */
71#endif
72#ifndef DFLSSIZ
73#define DFLSSIZ (512*1024) /* initial stack size limit */
74#endif
75#ifndef MAXSSIZ
76#define MAXSSIZ (8*1024*1024) /* max stack size */
77#endif
78
79/*
80 * Default sizes of swap allocation chunks (see dmap.h).
81 * The actual values may be changed in vminit() based on MAXDSIZ.
82 * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
83 */
84#define DMMIN 32 /* smallest swap allocation */
85#define DMMAX 4096 /* largest potential swap allocation */
86#define DMTEXT 1024 /* swap allocation for text */
87
88/*
89 * Sizes of the system and user portions of the system page table.
90 */
91#define SYSPTSIZE (2*NPTEPG)
92#define USRPTSIZE (2*NPTEPG)
93
94/*
95 * Size of the Shared Memory Pages page table.
96 */
97#ifndef SHMMAXPGS
98#define SHMMAXPGS 512 /* XXX until we have more kmap space */
99#endif
100
101/*
102 * Size of User Raw I/O map
103 */
104#define USRIOSIZE 300
105
106/*
107 * The size of the clock loop.
108 */
109#define LOOPPAGES (maxfree - firstfree)
110
111/*
112 * The time for a process to be blocked before being very swappable.
113 * This is a number of seconds which the system takes as being a non-trivial
114 * amount of real time. You probably shouldn't change this;
115 * it is used in subtle ways (fractions and multiples of it are, that is, like
116 * half of a ``long time'', almost a long time, etc.)
117 * It is related to human patience and other factors which don't really
118 * change over time.
119 */
120#define MAXSLP 20
121
122/*
123 * A swapped in process is given a small amount of core without being bothered
124 * by the page replacement algorithm. Basically this says that if you are
125 * swapped in you deserve some resources. We protect the last SAFERSS
126 * pages against paging and will just swap you out rather than paging you.
127 * Note that each process has at least UPAGES+CLSIZE pages which are not
128 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
129 * number just means a swapped in process is given around 25k bytes.
130 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
131 * so we loan each swapped in process memory worth 100$, or just admit
132 * that we don't consider it worthwhile and swap it out to disk which costs
133 * $30/mb or about $0.75.
134 * { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17
135 * on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) }
136 */
137#define SAFERSS 8 /* nominal ``small'' resident set size
138 protected against replacement */
139
140/*
141 * DISKRPM is used to estimate the number of paging i/o operations
142 * which one can expect from a single disk controller.
143 */
144#define DISKRPM 60
145
146/*
147 * Klustering constants. Klustering is the gathering
148 * of pages together for pagein/pageout, while clustering
149 * is the treatment of hardware page size as though it were
150 * larger than it really is.
151 *
152 * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
153 * units. Note that KLMAX*CLSIZE must be <= DMMIN in dmap.h.
154 */
155
156#define KLMAX (4/CLSIZE)
157#define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */
158#define KLIN (4/CLSIZE) /* default data/stack in klust */
159#define KLTXT (4/CLSIZE) /* default text in klust */
160#define KLOUT (4/CLSIZE)
161
162/*
163 * KLSDIST is the advance or retard of the fifo reclaim for sequential
164 * processes data space.
165 */
166#define KLSDIST 3 /* klusters advance/retard for seq. fifo */
167
168/*
169 * Paging thresholds (see vm_sched.c).
170 * Strategy of 1/19/85:
171 * lotsfree is 512k bytes, but at most 1/4 of memory
172 * desfree is 200k bytes, but at most 1/8 of memory
173 * minfree is 64k bytes, but at most 1/2 of desfree
174 */
175#define LOTSFREE (512 * 1024)
176#define LOTSFREEFRACT 4
177#define DESFREE (200 * 1024)
178#define DESFREEFRACT 8
179#define MINFREE (64 * 1024)
180#define MINFREEFRACT 2
181
182/*
183 * There are two clock hands, initially separated by HANDSPREAD bytes
184 * (but at most all of user memory). The amount of time to reclaim
185 * a page once the pageout process examines it increases with this
186 * distance and decreases as the scan rate rises.
187 */
188#define HANDSPREAD (2 * 1024 * 1024)
189
190/*
191 * The number of times per second to recompute the desired paging rate
192 * and poke the pagedaemon.
193 */
194#define RATETOSCHEDPAGING 4
195
196/*
197 * Believed threshold (in megabytes) for which interleaved
198 * swapping area is desirable.
199 */
200#define LOTSOFMEM 2
201
202#define mapin(pte, v, pfnum, prot) \
203 {(*(int *)(pte) = ((pfnum)<<PGSHIFT) | (prot)) ; }
204
205/*
206 * Mach derived constants
207 */
208
209/* user/kernel map constants */
210#define VM_MIN_ADDRESS ((vm_offset_t)0)
211#define VM_MAXUSER_ADDRESS ((vm_offset_t)0xFDBFE000)
212#define UPT_MIN_ADDRESS ((vm_offset_t)0xFDC00000)
213#define UPT_MAX_ADDRESS ((vm_offset_t)0xFDFF7000)
214#define VM_MAX_ADDRESS UPT_MAX_ADDRESS
215#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xFDFF7000)
216#define UPDT VM_MIN_KERNEL_ADDRESS
217#define KPT_MIN_ADDRESS ((vm_offset_t)0xFDFF8000)
218#define KPT_MAX_ADDRESS ((vm_offset_t)0xFDFFF000)
219#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFF7FF000)
220
221/* virtual sizes (bytes) for various kernel submaps */
222#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
223#define VM_KMEM_SIZE (16 * 1024 * 1024)
224#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
225
226/* pcb base */
227#define pcbb(p) ((u_int)(p)->p_addr)
228
229/*
230 * Flush MMU TLB
231 */
232
233#ifndef I386_CR3PAT
234#define I386_CR3PAT 0x0
235#endif
236
237#ifdef notyet
238#define _cr3() ({u_long rtn; \
239 asm (" movl %%cr3,%%eax; movl %%eax,%0 " \
240 : "=g" (rtn) \
241 : \
242 : "ax"); \
243 rtn; \
244})
245
246#define load_cr3(s) ({ u_long val; \
247 val = (s) | I386_CR3PAT; \
248 asm ("movl %0,%%eax; movl %%eax,%%cr3" \
249 : \
250 : "g" (val) \
251 : "ax"); \
252})
253
254#define tlbflush() ({ u_long val; \
255 val = u.u_pcb.pcb_ptd | I386_CR3PAT; \
256 asm ("movl %0,%%eax; movl %%eax,%%cr3" \
257 : \
258 : "g" (val) \
259 : "ax"); \
260})
261#endif