NetBSD/sys/arch/i386/include/vmparam.h

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/* $NetBSD: vmparam.h,v 1.45 2001/11/15 18:06:14 soren Exp $ */
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/*-
* 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.
*
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* @(#)vmparam.h 5.9 (Berkeley) 5/12/91
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*/
#ifndef _VMPARAM_H_
#define _VMPARAM_H_
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/*
* Machine dependent constants for 386.
*/
/*
* Page size on the IA-32 is not variable in the traditional sense.
* We override the PAGE_* definitions to compile-time constants.
*/
#define PAGE_SHIFT 12
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_MASK (PAGE_SIZE - 1)
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/*
* 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.
*/
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#define USRTEXT NBPG
#define USRSTACK VM_MAXUSER_ADDRESS
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/*
* Virtual memory related constants, all in bytes
*/
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#define MAXTSIZ (64*1024*1024) /* max text size */
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#ifndef DFLDSIZ
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#define DFLDSIZ (128*1024*1024) /* initial data size limit */
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#endif
#ifndef MAXDSIZ
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#define MAXDSIZ (1*1024*1024*1024) /* max data size */
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#endif
#ifndef DFLSSIZ
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#define DFLSSIZ (2*1024*1024) /* initial stack size limit */
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#endif
#ifndef MAXSSIZ
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#define MAXSSIZ (32*1024*1024) /* max stack size */
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#endif
/*
* Size of shared memory map
*/
#ifndef SHMMAXPGS
#define SHMMAXPGS 2048
#endif
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/*
* Size of User Raw I/O map
*/
#define USRIOSIZE 300
/*
* Mach derived constants
*/
/* user/kernel map constants */
#define VM_MIN_ADDRESS ((vaddr_t)0)
#define VM_MAXUSER_ADDRESS \
((vaddr_t)((PDSLOT_PTE << PDSHIFT) - (UPAGES * NBPG)))
#define VM_MAX_ADDRESS \
((vaddr_t)((PDSLOT_PTE << PDSHIFT) + (PDSLOT_PTE << PGSHIFT)))
#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDSLOT_KERN << PDSHIFT))
#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(PDSLOT_APTE << PDSHIFT))
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/* XXX max. amount of KVM to be used by buffers. */
#ifndef VM_MAX_KERNEL_BUF
#define VM_MAX_KERNEL_BUF (384 * 1024 * 1024)
#endif
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/* virtual sizes (bytes) for various kernel submaps */
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#define VM_PHYS_SIZE (USRIOSIZE*NBPG)
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#define VM_PHYSSEG_MAX 5 /* 1 "hole" + 4 free lists */
#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
#define VM_NFREELIST 2
#define VM_FREELIST_DEFAULT 0
#define VM_FREELIST_FIRST16 1
#define __HAVE_PMAP_PHYSSEG
/*
* pmap specific data stored in the vm_physmem[] array
*/
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struct pmap_physseg {
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struct pv_head *pvhead; /* pv_head array */
char *attrs; /* attrs array */
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};
#endif /* _VMPARAM_H_ */