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 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91
37 */
38
39
40/*
41 * Machine dependent constants for 386.
42 */
43
44/*
45 * Virtual address space arrangement. On 386, both user and kernel
46 * share the address space, not unlike the vax.
47 * USRTEXT is the start of the user text/data space, while USRSTACK
48 * is the top (end) of the user stack. Immediately above the user stack
49 * resides the user structure, which is UPAGES long and contains the
50 * kernel stack.
51 *
52 * Immediately after the user structure is the page table map, and then
53 * kernal address space.
54 */
55#define USRTEXT 0
56#define USRSTACK 0xFDBFE000
57#define BTOPUSRSTACK (0xFDC00-(UPAGES)) /* btop(USRSTACK) */
58#define LOWPAGES 0
59#define HIGHPAGES UPAGES
60
61/*
62 * Virtual memory related constants, all in bytes
63 */
64#define MAXTSIZ (6*1024*1024) /* max text size */
65#ifndef DFLDSIZ
66#define DFLDSIZ (16*1024*1024) /* initial data size limit */
67#endif
68#ifndef MAXDSIZ
69#define MAXDSIZ (32*1024*1024) /* max data size */
70#endif
71#ifndef DFLSSIZ
72#define DFLSSIZ (512*1024) /* initial stack size limit */
73#endif
74#ifndef MAXSSIZ
75#define MAXSSIZ (8*1024*1024) /* max stack size */
76#endif
77
78/*
79 * Default sizes of swap allocation chunks (see dmap.h).
80 * The actual values may be changed in vminit() based on MAXDSIZ.
81 * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
82 */
83#define DMMIN 32 /* smallest swap allocation */
84#define DMMAX 4096 /* largest potential swap allocation */
85#define DMTEXT 1024 /* swap allocation for text */
86
87/*
88 * Sizes of the system and user portions of the system page table.
89 */
90#define SYSPTSIZE (2*NPTEPG)
91#define USRPTSIZE (2*NPTEPG)
92
93/*
94 * Size of the Shared Memory Pages page table.
95 */
96#ifndef SHMMAXPGS
97#define SHMMAXPGS 64 /* XXX until we have more kmap space */
98#endif
99
100/*
101 * Size of User Raw I/O map
102 */
103#define USRIOSIZE 300
104
105/*
106 * The size of the clock loop.
107 */
108#define LOOPPAGES (maxfree - firstfree)
109
110/*
111 * The time for a process to be blocked before being very swappable.
112 * This is a number of seconds which the system takes as being a non-trivial
113 * amount of real time. You probably shouldn't change this;
114 * it is used in subtle ways (fractions and multiples of it are, that is, like
115 * half of a ``long time'', almost a long time, etc.)
116 * It is related to human patience and other factors which don't really
117 * change over time.
118 */
119#define MAXSLP 20
120
121/*
122 * A swapped in process is given a small amount of core without being bothered
123 * by the page replacement algorithm. Basically this says that if you are
124 * swapped in you deserve some resources. We protect the last SAFERSS
125 * pages against paging and will just swap you out rather than paging you.
126 * Note that each process has at least UPAGES+CLSIZE pages which are not
127 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
128 * number just means a swapped in process is given around 25k bytes.
129 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
130 * so we loan each swapped in process memory worth 100$, or just admit
131 * that we don't consider it worthwhile and swap it out to disk which costs
132 * $30/mb or about $0.75.
133 * { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17
134 * on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) }
135 */
136#define SAFERSS 8 /* nominal ``small'' resident set size
137 protected against replacement */
138
139/*
140 * DISKRPM is used to estimate the number of paging i/o operations
141 * which one can expect from a single disk controller.
142 */
143#define DISKRPM 60
144
145/*
146 * Klustering constants. Klustering is the gathering
147 * of pages together for pagein/pageout, while clustering
148 * is the treatment of hardware page size as though it were
149 * larger than it really is.
150 *
151 * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
152 * units. Note that KLMAX*CLSIZE must be <= DMMIN in dmap.h.
153 */
154
155#define KLMAX (4/CLSIZE)
156#define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */
157#define KLIN (4/CLSIZE) /* default data/stack in klust */
158#define KLTXT (4/CLSIZE) /* default text in klust */
159#define KLOUT (4/CLSIZE)
160
161/*
162 * KLSDIST is the advance or retard of the fifo reclaim for sequential
163 * processes data space.
164 */
165#define KLSDIST 3 /* klusters advance/retard for seq. fifo */
166
167/*
168 * Paging thresholds (see vm_sched.c).
169 * Strategy of 1/19/85:
170 * lotsfree is 512k bytes, but at most 1/4 of memory
171 * desfree is 200k bytes, but at most 1/8 of memory
172 * minfree is 64k bytes, but at most 1/2 of desfree
173 */
174#define LOTSFREE (512 * 1024)
175#define LOTSFREEFRACT 4
176#define DESFREE (200 * 1024)
177#define DESFREEFRACT 8
178#define MINFREE (64 * 1024)
179#define MINFREEFRACT 2
180
181/*
182 * There are two clock hands, initially separated by HANDSPREAD bytes
183 * (but at most all of user memory). The amount of time to reclaim
184 * a page once the pageout process examines it increases with this
185 * distance and decreases as the scan rate rises.
186 */
187#define HANDSPREAD (2 * 1024 * 1024)
188
189/*
190 * The number of times per second to recompute the desired paging rate
191 * and poke the pagedaemon.
192 */
193#define RATETOSCHEDPAGING 4
194
195/*
196 * Believed threshold (in megabytes) for which interleaved
197 * swapping area is desirable.
198 */
199#define LOTSOFMEM 2
200
201#define mapin(pte, v, pfnum, prot) \
202 {(*(int *)(pte) = ((pfnum)<<PGSHIFT) | (prot)) ; }
203
204/*
205 * Mach derived constants
206 */
207
208/* user/kernel map constants */
209#define VM_MIN_ADDRESS ((vm_offset_t)0)
210#define VM_MAXUSER_ADDRESS ((vm_offset_t)0xFDBFE000)
211#define UPT_MIN_ADDRESS ((vm_offset_t)0xFDC00000)
212#define UPT_MAX_ADDRESS ((vm_offset_t)0xFDFF7000)
213#define VM_MAX_ADDRESS UPT_MAX_ADDRESS
214#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xFDFF7000)
215#define UPDT VM_MIN_KERNEL_ADDRESS
216#define KPT_MIN_ADDRESS ((vm_offset_t)0xFDFF8000)
217#define KPT_MAX_ADDRESS ((vm_offset_t)0xFDFFF000)
218#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFF7FF000)
219
220/* virtual sizes (bytes) for various kernel submaps */
221#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
222#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)
223#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
224
225/* # of kernel PT pages (initial only, can grow dynamically) */
226#define VM_KERNEL_PT_PAGES ((vm_size_t)2) /* XXX: SYSPTSIZE */
227
228/* pcb base */
229#define pcbb(p) ((u_int)(p)->p_addr)
230
231/*
232 * Flush MMU TLB
233 */
234
235#ifndef I386_CR3PAT
236#define I386_CR3PAT 0x0
237#endif
238
239#ifdef notyet
240#define _cr3() ({u_long rtn; \
241 asm (" movl %%cr3,%%eax; movl %%eax,%0 " \
242 : "=g" (rtn) \
243 : \
244 : "ax"); \
245 rtn; \
246})
247
248#define load_cr3(s) ({ u_long val; \
249 val = (s) | I386_CR3PAT; \
250 asm ("movl %0,%%eax; movl %%eax,%%cr3" \
251 : \
252 : "g" (val) \
253 : "ax"); \
254})
255
256#define tlbflush() ({ u_long val; \
257 val = u.u_pcb.pcb_ptd | I386_CR3PAT; \
258 asm ("movl %0,%%eax; movl %%eax,%%cr3" \
259 : \
260 : "g" (val) \
261 : "ax"); \
262})
263#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 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91
37 */
38
39
40/*
41 * Machine dependent constants for 386.
42 */
43
44/*
45 * Virtual address space arrangement. On 386, both user and kernel
46 * share the address space, not unlike the vax.
47 * USRTEXT is the start of the user text/data space, while USRSTACK
48 * is the top (end) of the user stack. Immediately above the user stack
49 * resides the user structure, which is UPAGES long and contains the
50 * kernel stack.
51 *
52 * Immediately after the user structure is the page table map, and then
53 * kernal address space.
54 */
55#define USRTEXT 0
56#define USRSTACK 0xFDBFE000
57#define BTOPUSRSTACK (0xFDC00-(UPAGES)) /* btop(USRSTACK) */
58#define LOWPAGES 0
59#define HIGHPAGES UPAGES
60
61/*
62 * Virtual memory related constants, all in bytes
63 */
64#define MAXTSIZ (6*1024*1024) /* max text size */
65#ifndef DFLDSIZ
66#define DFLDSIZ (16*1024*1024) /* initial data size limit */
67#endif
68#ifndef MAXDSIZ
69#define MAXDSIZ (32*1024*1024) /* max data size */
70#endif
71#ifndef DFLSSIZ
72#define DFLSSIZ (512*1024) /* initial stack size limit */
73#endif
74#ifndef MAXSSIZ
75#define MAXSSIZ (8*1024*1024) /* max stack size */
76#endif
77
78/*
79 * Default sizes of swap allocation chunks (see dmap.h).
80 * The actual values may be changed in vminit() based on MAXDSIZ.
81 * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
82 */
83#define DMMIN 32 /* smallest swap allocation */
84#define DMMAX 4096 /* largest potential swap allocation */
85#define DMTEXT 1024 /* swap allocation for text */
86
87/*
88 * Sizes of the system and user portions of the system page table.
89 */
90#define SYSPTSIZE (2*NPTEPG)
91#define USRPTSIZE (2*NPTEPG)
92
93/*
94 * Size of the Shared Memory Pages page table.
95 */
96#ifndef SHMMAXPGS
97#define SHMMAXPGS 64 /* XXX until we have more kmap space */
98#endif
99
100/*
101 * Size of User Raw I/O map
102 */
103#define USRIOSIZE 300
104
105/*
106 * The size of the clock loop.
107 */
108#define LOOPPAGES (maxfree - firstfree)
109
110/*
111 * The time for a process to be blocked before being very swappable.
112 * This is a number of seconds which the system takes as being a non-trivial
113 * amount of real time. You probably shouldn't change this;
114 * it is used in subtle ways (fractions and multiples of it are, that is, like
115 * half of a ``long time'', almost a long time, etc.)
116 * It is related to human patience and other factors which don't really
117 * change over time.
118 */
119#define MAXSLP 20
120
121/*
122 * A swapped in process is given a small amount of core without being bothered
123 * by the page replacement algorithm. Basically this says that if you are
124 * swapped in you deserve some resources. We protect the last SAFERSS
125 * pages against paging and will just swap you out rather than paging you.
126 * Note that each process has at least UPAGES+CLSIZE pages which are not
127 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
128 * number just means a swapped in process is given around 25k bytes.
129 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
130 * so we loan each swapped in process memory worth 100$, or just admit
131 * that we don't consider it worthwhile and swap it out to disk which costs
132 * $30/mb or about $0.75.
133 * { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17
134 * on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) }
135 */
136#define SAFERSS 8 /* nominal ``small'' resident set size
137 protected against replacement */
138
139/*
140 * DISKRPM is used to estimate the number of paging i/o operations
141 * which one can expect from a single disk controller.
142 */
143#define DISKRPM 60
144
145/*
146 * Klustering constants. Klustering is the gathering
147 * of pages together for pagein/pageout, while clustering
148 * is the treatment of hardware page size as though it were
149 * larger than it really is.
150 *
151 * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
152 * units. Note that KLMAX*CLSIZE must be <= DMMIN in dmap.h.
153 */
154
155#define KLMAX (4/CLSIZE)
156#define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */
157#define KLIN (4/CLSIZE) /* default data/stack in klust */
158#define KLTXT (4/CLSIZE) /* default text in klust */
159#define KLOUT (4/CLSIZE)
160
161/*
162 * KLSDIST is the advance or retard of the fifo reclaim for sequential
163 * processes data space.
164 */
165#define KLSDIST 3 /* klusters advance/retard for seq. fifo */
166
167/*
168 * Paging thresholds (see vm_sched.c).
169 * Strategy of 1/19/85:
170 * lotsfree is 512k bytes, but at most 1/4 of memory
171 * desfree is 200k bytes, but at most 1/8 of memory
172 * minfree is 64k bytes, but at most 1/2 of desfree
173 */
174#define LOTSFREE (512 * 1024)
175#define LOTSFREEFRACT 4
176#define DESFREE (200 * 1024)
177#define DESFREEFRACT 8
178#define MINFREE (64 * 1024)
179#define MINFREEFRACT 2
180
181/*
182 * There are two clock hands, initially separated by HANDSPREAD bytes
183 * (but at most all of user memory). The amount of time to reclaim
184 * a page once the pageout process examines it increases with this
185 * distance and decreases as the scan rate rises.
186 */
187#define HANDSPREAD (2 * 1024 * 1024)
188
189/*
190 * The number of times per second to recompute the desired paging rate
191 * and poke the pagedaemon.
192 */
193#define RATETOSCHEDPAGING 4
194
195/*
196 * Believed threshold (in megabytes) for which interleaved
197 * swapping area is desirable.
198 */
199#define LOTSOFMEM 2
200
201#define mapin(pte, v, pfnum, prot) \
202 {(*(int *)(pte) = ((pfnum)<<PGSHIFT) | (prot)) ; }
203
204/*
205 * Mach derived constants
206 */
207
208/* user/kernel map constants */
209#define VM_MIN_ADDRESS ((vm_offset_t)0)
210#define VM_MAXUSER_ADDRESS ((vm_offset_t)0xFDBFE000)
211#define UPT_MIN_ADDRESS ((vm_offset_t)0xFDC00000)
212#define UPT_MAX_ADDRESS ((vm_offset_t)0xFDFF7000)
213#define VM_MAX_ADDRESS UPT_MAX_ADDRESS
214#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xFDFF7000)
215#define UPDT VM_MIN_KERNEL_ADDRESS
216#define KPT_MIN_ADDRESS ((vm_offset_t)0xFDFF8000)
217#define KPT_MAX_ADDRESS ((vm_offset_t)0xFDFFF000)
218#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFF7FF000)
219
220/* virtual sizes (bytes) for various kernel submaps */
221#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
222#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)
223#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
224
225/* # of kernel PT pages (initial only, can grow dynamically) */
226#define VM_KERNEL_PT_PAGES ((vm_size_t)2) /* XXX: SYSPTSIZE */
227
228/* pcb base */
229#define pcbb(p) ((u_int)(p)->p_addr)
230
231/*
232 * Flush MMU TLB
233 */
234
235#ifndef I386_CR3PAT
236#define I386_CR3PAT 0x0
237#endif
238
239#ifdef notyet
240#define _cr3() ({u_long rtn; \
241 asm (" movl %%cr3,%%eax; movl %%eax,%0 " \
242 : "=g" (rtn) \
243 : \
244 : "ax"); \
245 rtn; \
246})
247
248#define load_cr3(s) ({ u_long val; \
249 val = (s) | I386_CR3PAT; \
250 asm ("movl %0,%%eax; movl %%eax,%%cr3" \
251 : \
252 : "g" (val) \
253 : "ax"); \
254})
255
256#define tlbflush() ({ u_long val; \
257 val = u.u_pcb.pcb_ptd | I386_CR3PAT; \
258 asm ("movl %0,%%eax; movl %%eax,%%cr3" \
259 : \
260 : "g" (val) \
261 : "ax"); \
262})
263#endif