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Diffstat (limited to 'sys/arch/i386/include/vmparam.h')
| -rw-r--r-- | sys/arch/i386/include/vmparam.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/sys/arch/i386/include/vmparam.h b/sys/arch/i386/include/vmparam.h new file mode 100644 index 00000000000..43a99016713 --- /dev/null +++ b/sys/arch/i386/include/vmparam.h @@ -0,0 +1,145 @@ +/* $NetBSD: vmparam.h,v 1.15 1994/10/27 04:16:34 cgd Exp $ */ + +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * William Jolitz. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)vmparam.h 5.9 (Berkeley) 5/12/91 + */ + + +/* + * Machine dependent constants for 386. + */ + +/* + * Virtual address space arrangement. On 386, both user and kernel + * share the address space, not unlike the vax. + * USRTEXT is the start of the user text/data space, while USRSTACK + * is the top (end) of the user stack. Immediately above the user stack + * resides the user structure, which is UPAGES long and contains the + * kernel stack. + * + * Immediately after the user structure is the page table map, and then + * kernal address space. + */ +#define USRTEXT CLBYTES +#define USRSTACK VM_MAXUSER_ADDRESS + +/* + * Virtual memory related constants, all in bytes + */ +#define MAXTSIZ (8*1024*1024) /* max text size */ +#ifndef DFLDSIZ +#define DFLDSIZ (16*1024*1024) /* initial data size limit */ +#endif +#ifndef MAXDSIZ +#define MAXDSIZ (256*1024*1024) /* max data size */ +#endif +#ifndef DFLSSIZ +#define DFLSSIZ (512*1024) /* initial stack size limit */ +#endif +#ifndef MAXSSIZ +#define MAXSSIZ (8*1024*1024) /* max stack size */ +#endif + +/* + * Default sizes of swap allocation chunks (see dmap.h). + * The actual values may be changed in vminit() based on MAXDSIZ. + * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024. + */ +#define DMMIN 32 /* smallest swap allocation */ +#define DMMAX 4096 /* largest potential swap allocation */ +#define DMTEXT 1024 /* swap allocation for text */ + +/* + * Size of shared memory map + */ +#ifndef SHMMAXPGS +#define SHMMAXPGS 1024 +#endif + +/* + * Size of User Raw I/O map + */ +#define USRIOSIZE 300 + +/* + * The time for a process to be blocked before being very swappable. + * This is a number of seconds which the system takes as being a non-trivial + * amount of real time. You probably shouldn't change this; + * it is used in subtle ways (fractions and multiples of it are, that is, like + * half of a ``long time'', almost a long time, etc.) + * It is related to human patience and other factors which don't really + * change over time. + */ +#define MAXSLP 20 + +/* + * A swapped in process is given a small amount of core without being bothered + * by the page replacement algorithm. Basically this says that if you are + * swapped in you deserve some resources. We protect the last SAFERSS + * pages against paging and will just swap you out rather than paging you. + * Note that each process has at least UPAGES+CLSIZE pages which are not + * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this + * number just means a swapped in process is given around 25k bytes. + * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), + * so we loan each swapped in process memory worth 100$, or just admit + * that we don't consider it worthwhile and swap it out to disk which costs + * $30/mb or about $0.75. + * { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17 + * on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) } + */ +#define SAFERSS 8 /* nominal ``small'' resident set size + protected against replacement */ + +/* + * Mach derived constants + */ + +/* user/kernel map constants */ +#define VM_MIN_ADDRESS ((vm_offset_t)0) +/* PTDPTDI<<PDSHIFT - UPAGES*NBPG */ +#define VM_MAXUSER_ADDRESS ((vm_offset_t)0xf7bfe000) +/* PTDPTDI<<PDSHIFT + PTDPTDI<<PGSHIFT */ +#define VM_MAX_ADDRESS ((vm_offset_t)0xf7fdf000) +/* KPTDI<<PDSHIFT */ +#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xf8000000) +/* APTDPTDI<<PDSHIFT */ +#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xffc00000) + +/* virtual sizes (bytes) for various kernel submaps */ +#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) +#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES) +#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES) |