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Diffstat (limited to 'sys/arch/sun3/include/vmparam.h')
| -rw-r--r-- | sys/arch/sun3/include/vmparam.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/sys/arch/sun3/include/vmparam.h b/sys/arch/sun3/include/vmparam.h new file mode 100644 index 00000000000..1fac8109288 --- /dev/null +++ b/sys/arch/sun3/include/vmparam.h @@ -0,0 +1,161 @@ +/* $NetBSD: vmparam.h,v 1.14 1995/09/26 04:02:10 gwr Exp $ */ + +/* + * Copyright (c) 1994 Gordon W. Ross + * Copyright (c) 1993 Adam Glass + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * 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. + * + * from: Utah $Hdr: vmparam.h 1.16 91/01/18$ + * from: @(#)vmparam.h 7.3 (Berkeley) 5/7/91 + * vmparam.h,v 1.2 1993/05/22 07:58:38 cgd Exp + */ + +/* + * Machine dependent constants for Sun3 + * + * The Sun3 has limited total kernel virtual space (32MB) and + * can not use main memory for page tables. (All active PTEs + * must be installed in special translation RAM in the MMU). + * Therefore, parameters that would normally configure the + * size of various page tables are irrelevant. Only things + * that consume portions of kernel virtual (KV) space matter, + * and those things should be chosen to conserve KV space. + */ + +/* + * USRTEXT is the start of the user text/data space, while + * USRSTACK is the top (end) of the user stack. + */ +#define USRTEXT NBPG /* Start of user text */ +#define USRSTACK KERNBASE /* High end of user stack */ + +/* + * Virtual memory related constants, all in bytes + */ +#ifndef MAXTSIZ +#define MAXTSIZ (8*1024*1024) /* max text size */ +#endif +#ifndef DFLDSIZ +#define DFLDSIZ (8*1024*1024) /* initial data size limit */ +#endif +#ifndef MAXDSIZ +#define MAXDSIZ (32*1024*1024) /* max data size */ +#endif +#ifndef DFLSSIZ +#define DFLSSIZ (512*1024) /* initial stack size limit */ +#endif +#ifndef MAXSSIZ +#define MAXSSIZ MAXDSIZ /* 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. + * DMMIN should be at least ctod(1) so that vtod() works. + * vminit() insures this. + */ +#define DMMIN 32 /* smallest swap allocation */ +#define DMMAX 4096 /* largest potential swap allocation */ + +/* + * PTEs for mapping user space into the kernel for phyio operations. + * The actual limitation for physio requests will be the DVMA space, + * and that is fixed by hardware design at 1MB. We could make the + * physio map larger than that, but it would not buy us much. + */ +#ifndef USRIOSIZE +#define USRIOSIZE 128 /* 1 MB */ +#endif + +/* + * PTEs for system V style shared memory. + * This is basically slop for kmempt which we actually allocate (malloc) from. + */ +#ifndef SHMMAXPGS +#define SHMMAXPGS 512 /* 4 MB */ +#endif + +/* + * 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. + */ +#define SAFERSS 4 /* nominal ``small'' resident set size + protected against replacement */ + +/* + * Mach-derived constants, virtual memory map: + * + * 0000.0000 user space + * 0E00.0000 kernel space + * 0FE0.0000 monitor map (devices) + * 0FF0.0000 DVMA space + * 0FFE.0000 monitor RAM seg. + * 0FFF.E000 monitor RAM page + */ + +/* user/kernel map constants */ +#define VM_MIN_ADDRESS ((vm_offset_t)0) +#define VM_MAX_ADDRESS ((vm_offset_t)KERNBASE) +#define VM_MAXUSER_ADDRESS ((vm_offset_t)KERNBASE) +#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE) +#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0x0FE00000) + +/* 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) |