NetBSD/sys/arch/sun3/include/vmparam3.h

124 lines
4.5 KiB
C

/* $NetBSD: vmparam3.h,v 1.28 2000/02/11 19:30:30 thorpej 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.
* The Sun3 has only 224 MB of user-virtual space,
* so we need to be conservative with these limits.
*/
#ifndef MAXTSIZ
#define MAXTSIZ (8*1024*1024) /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ (16*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
/*
* 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
/*
* Mach-derived constants:
*/
/* 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)KERN_END)
/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE (USRIOSIZE*NBPG)
#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
#define VM_NFREELIST 1
#define VM_FREELIST_DEFAULT 0