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vmparam.h revision 1.74 
      1 /*	$NetBSD: vmparam.h,v 1.74 2012/05/07 16:16:44 joerg 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 _I386_VMPARAM_H_
     38 #define _I386_VMPARAM_H_
     39 
     40 #include <sys/tree.h>
     41 #include <sys/mutex.h>
     42 
     43 /*
     44  * Machine dependent constants for 386.
     45  */
     46 
     47 /*
     48  * Page size on the IA-32 is not variable in the traditional sense.
     49  * We override the PAGE_* definitions to compile-time constants.
     50  */
     51 #define	PAGE_SHIFT	12
     52 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     53 #define	PAGE_MASK	(PAGE_SIZE - 1)
     54 
     55 /*
     56  * Virtual address space arrangement. On 386, both user and kernel
     57  * share the address space, not unlike the vax.
     58  * USRSTACK is the top (end) of the user stack. Immediately above the
     59  * user stack is the page table map, and then kernel address space.
     60  */
     61 #define	USRSTACK	VM_MAXUSER_ADDRESS
     62 
     63 /*
     64  * Virtual memory related constants, all in bytes
     65  */
     66 #define	MAXTSIZ		(256*1024*1024)		/* max text size */
     67 #ifndef DFLDSIZ
     68 #define	DFLDSIZ		(256*1024*1024)		/* initial data size limit */
     69 #endif
     70 #ifndef MAXDSIZ
     71 #define	MAXDSIZ		(3U*1024*1024*1024)	/* max data size */
     72 #endif
     73 #ifndef	DFLSSIZ
     74 #define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
     75 #endif
     76 #ifndef	MAXSSIZ
     77 #define	MAXSSIZ		(64*1024*1024)		/* max stack size */
     78 #endif
     79 
     80 /*
     81  * IA-32 can't do per-page execute permission, so instead we implement
     82  * two executable segments for %cs, one that covers everything and one
     83  * that excludes some of the address space (currently just the stack).
     84  * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment.
     85  */
     86 #define I386_MAX_EXE_ADDR	(USRSTACK - MAXSSIZ)
     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)(PDIR_SLOT_PTE << L2_SHIFT))
    100 #define	VM_MAX_ADDRESS		\
    101 	((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT)))
    102 #define	VM_MIN_KERNEL_ADDRESS	((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT))
    103 #define	VM_MAX_KERNEL_ADDRESS	((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT))
    104 
    105 /*
    106  * The address to which unspecified mapping requests default
    107  */
    108 #ifdef _KERNEL_OPT
    109 #include "opt_uvm.h"
    110 #include "opt_xen.h"
    111 #endif
    112 #define __USE_TOPDOWN_VM
    113 #define VM_DEFAULT_ADDRESS(da, sz) \
    114 	trunc_page(USRSTACK - MAXSSIZ - (sz))
    115 
    116 /* XXX max. amount of KVM to be used by buffers. */
    117 #ifndef VM_MAX_KERNEL_BUF
    118 #define VM_MAX_KERNEL_BUF	(384 * 1024 * 1024)
    119 #endif
    120 
    121 /* virtual sizes (bytes) for various kernel submaps */
    122 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    123 
    124 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
    125 
    126 #ifdef XEN
    127 #define	VM_PHYSSEG_MAX		1
    128 #define	VM_NFREELIST		1
    129 #else
    130 #define	VM_PHYSSEG_MAX		10	/* 1 "hole" + 9 free lists */
    131 #define	VM_NFREELIST		2
    132 #define	VM_FREELIST_FIRST16	1
    133 #endif /* XEN */
    134 #define	VM_FREELIST_DEFAULT	0
    135 
    136 #endif /* _I386_VMPARAM_H_ */
    137