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vmparam.h revision 1.54 
      1 /*	$NetBSD: vmparam.h,v 1.54 2003/08/24 17:52:33 chs 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)vmparam.h	5.9 (Berkeley) 5/12/91
     35  */
     36 
     37 #ifndef _VMPARAM_H_
     38 #define _VMPARAM_H_
     39 
     40 /*
     41  * Machine dependent constants for 386.
     42  */
     43 
     44 /*
     45  * Page size on the IA-32 is not variable in the traditional sense.
     46  * We override the PAGE_* definitions to compile-time constants.
     47  */
     48 #define	PAGE_SHIFT	12
     49 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     50 #define	PAGE_MASK	(PAGE_SIZE - 1)
     51 
     52 /*
     53  * Virtual address space arrangement. On 386, both user and kernel
     54  * share the address space, not unlike the vax.
     55  * USRSTACK is the top (end) of the user stack. Immediately above the
     56  * user stack is the page table map, and then kernel address space.
     57  */
     58 #define	USRSTACK	VM_MAXUSER_ADDRESS
     59 
     60 /*
     61  * Virtual memory related constants, all in bytes
     62  */
     63 #define	MAXTSIZ		(64*1024*1024)		/* max text size */
     64 #ifndef DFLDSIZ
     65 #define	DFLDSIZ		(128*1024*1024)		/* initial data size limit */
     66 #endif
     67 #ifndef MAXDSIZ
     68 #define	MAXDSIZ		(1*1024*1024*1024)	/* max data size */
     69 #endif
     70 #ifndef	DFLSSIZ
     71 #define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
     72 #endif
     73 #ifndef	MAXSSIZ
     74 #define	MAXSSIZ		(32*1024*1024)		/* max stack size */
     75 #endif
     76 
     77 /*
     78  * IA-32 can't do per-page execute permission, so instead we implement
     79  * two executable segments for %cs, one that covers everything and one
     80  * that excludes some of the address space (currently just the stack).
     81  * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment.
     82  */
     83 #define I386_MAX_EXE_ADDR	(USRSTACK - MAXSSIZ)
     84 
     85 /*
     86  * Size of shared memory map
     87  */
     88 #ifndef SHMMAXPGS
     89 #define SHMMAXPGS	2048
     90 #endif
     91 
     92 /*
     93  * Size of User Raw I/O map
     94  */
     95 #define	USRIOSIZE 	300
     96 
     97 /*
     98  * Mach derived constants
     99  */
    100 
    101 /* user/kernel map constants */
    102 #define VM_MIN_ADDRESS		((vaddr_t)0)
    103 #define	VM_MAXUSER_ADDRESS	((vaddr_t)(PDSLOT_PTE << PDSHIFT))
    104 #define	VM_MAX_ADDRESS		\
    105 		((vaddr_t)((PDSLOT_PTE << PDSHIFT) + (PDSLOT_PTE << PGSHIFT)))
    106 #define	VM_MIN_KERNEL_ADDRESS	((vaddr_t)(PDSLOT_KERN << PDSHIFT))
    107 #define	VM_MAX_KERNEL_ADDRESS	((vaddr_t)(PDSLOT_APTE << PDSHIFT))
    108 
    109 /*
    110  * The address to which unspecified mapping requests default
    111  */
    112 #ifdef _KERNEL_OPT
    113 #include "opt_uvm.h"
    114 #endif
    115 #define __HAVE_TOPDOWN_VM
    116 #ifdef USE_TOPDOWN_VM
    117 #define VM_DEFAULT_ADDRESS(da, sz) \
    118 	trunc_page(USRSTACK - MAXSSIZ - (sz))
    119 #endif
    120 
    121 /* XXX max. amount of KVM to be used by buffers. */
    122 #ifndef VM_MAX_KERNEL_BUF
    123 #define VM_MAX_KERNEL_BUF	(384 * 1024 * 1024)
    124 #endif
    125 
    126 /* virtual sizes (bytes) for various kernel submaps */
    127 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    128 
    129 #define VM_PHYSSEG_MAX		5	/* 1 "hole" + 4 free lists */
    130 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
    131 #define VM_PHYSSEG_NOADD		/* can't add RAM after vm_mem_init */
    132 
    133 #define	VM_NFREELIST		2
    134 #define	VM_FREELIST_DEFAULT	0
    135 #define	VM_FREELIST_FIRST16	1
    136 
    137 #define	__HAVE_VM_PAGE_MD
    138 #define	VM_MDPAGE_INIT(pg)					\
    139 	memset(&(pg)->mdpage, 0, sizeof((pg)->mdpage));		\
    140 	simple_lock_init(&(pg)->mdpage.mp_pvhead.pvh_lock);	\
    141 
    142 struct pv_entry;
    143 
    144 struct pv_head {
    145 	struct simplelock pvh_lock;	/* locks every pv on this list */
    146 	struct pv_entry *pvh_list;	/* head of list (locked by pvh_lock) */
    147 };
    148 
    149 struct vm_page_md {
    150 	struct pv_head mp_pvhead;
    151 	int mp_attrs;
    152 };
    153 
    154 #endif /* _VMPARAM_H_ */
    155