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vmparam.h revision 1.52 
      1 /*	$NetBSD: vmparam.h,v 1.52 2003/07/22 13:55:33 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)vmparam.h	5.9 (Berkeley) 5/12/91
     39  */
     40 
     41 #ifndef _VMPARAM_H_
     42 #define _VMPARAM_H_
     43 
     44 /*
     45  * Machine dependent constants for 386.
     46  */
     47 
     48 /*
     49  * Page size on the IA-32 is not variable in the traditional sense.
     50  * We override the PAGE_* definitions to compile-time constants.
     51  */
     52 #define	PAGE_SHIFT	12
     53 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     54 #define	PAGE_MASK	(PAGE_SIZE - 1)
     55 
     56 /*
     57  * Virtual address space arrangement. On 386, both user and kernel
     58  * share the address space, not unlike the vax.
     59  * USRSTACK is the top (end) of the user stack. Immediately above the
     60  * user stack is the page table map, and then kernel address space.
     61  */
     62 #define	USRSTACK	VM_MAXUSER_ADDRESS
     63 
     64 /*
     65  * Virtual memory related constants, all in bytes
     66  */
     67 #define	MAXTSIZ		(64*1024*1024)		/* max text size */
     68 #ifndef DFLDSIZ
     69 #define	DFLDSIZ		(128*1024*1024)		/* initial data size limit */
     70 #endif
     71 #ifndef MAXDSIZ
     72 #define	MAXDSIZ		(1*1024*1024*1024)	/* max data size */
     73 #endif
     74 #ifndef	DFLSSIZ
     75 #define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
     76 #endif
     77 #ifndef	MAXSSIZ
     78 #define	MAXSSIZ		(32*1024*1024)		/* max stack size */
     79 #endif
     80 
     81 /*
     82  * Size of shared memory map
     83  */
     84 #ifndef SHMMAXPGS
     85 #define SHMMAXPGS	2048
     86 #endif
     87 
     88 /*
     89  * Size of User Raw I/O map
     90  */
     91 #define	USRIOSIZE 	300
     92 
     93 /*
     94  * Mach derived constants
     95  */
     96 
     97 /* user/kernel map constants */
     98 #define VM_MIN_ADDRESS		((vaddr_t)0)
     99 #define	VM_MAXUSER_ADDRESS	((vaddr_t)(PDSLOT_PTE << PDSHIFT))
    100 #define	VM_MAX_ADDRESS		\
    101 		((vaddr_t)((PDSLOT_PTE << PDSHIFT) + (PDSLOT_PTE << PGSHIFT)))
    102 #define	VM_MIN_KERNEL_ADDRESS	((vaddr_t)(PDSLOT_KERN << PDSHIFT))
    103 #define	VM_MAX_KERNEL_ADDRESS	((vaddr_t)(PDSLOT_APTE << PDSHIFT))
    104 
    105 /*
    106  * The address to which unspecified mapping requests default
    107  */
    108 #ifdef _KERNEL_OPT
    109 #include "opt_uvm.h"
    110 #endif
    111 #define __HAVE_TOPDOWN_VM
    112 #ifdef USE_TOPDOWN_VM
    113 #define VM_DEFAULT_ADDRESS(da, sz) \
    114 	trunc_page(VM_MAXUSER_ADDRESS - MAXSSIZ - (sz))
    115 #endif
    116 
    117 /* XXX max. amount of KVM to be used by buffers. */
    118 #ifndef VM_MAX_KERNEL_BUF
    119 #define VM_MAX_KERNEL_BUF	(384 * 1024 * 1024)
    120 #endif
    121 
    122 /* virtual sizes (bytes) for various kernel submaps */
    123 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    124 
    125 #define VM_PHYSSEG_MAX		5	/* 1 "hole" + 4 free lists */
    126 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
    127 #define VM_PHYSSEG_NOADD		/* can't add RAM after vm_mem_init */
    128 
    129 #define	VM_NFREELIST		2
    130 #define	VM_FREELIST_DEFAULT	0
    131 #define	VM_FREELIST_FIRST16	1
    132 
    133 #define	__HAVE_VM_PAGE_MD
    134 #define	VM_MDPAGE_INIT(pg)					\
    135 	memset(&(pg)->mdpage, 0, sizeof((pg)->mdpage));		\
    136 	simple_lock_init(&(pg)->mdpage.mp_pvhead.pvh_lock);	\
    137 
    138 struct pv_entry;
    139 
    140 struct pv_head {
    141 	struct simplelock pvh_lock;	/* locks every pv on this list */
    142 	struct pv_entry *pvh_list;	/* head of list (locked by pvh_lock) */
    143 };
    144 
    145 struct vm_page_md {
    146 	struct pv_head mp_pvhead;
    147 	int mp_attrs;
    148 };
    149 
    150 #endif /* _VMPARAM_H_ */
    151