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 262