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