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vmparam.h revision 1.79 
      1 /*	$NetBSD: vmparam.h,v 1.79 2014/01/28 17:46:01 christos 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)	/* 3G max data size */
     72 #endif
     73 #ifndef MAXDSIZ_BU
     74 #define	MAXDSIZ_BU	(2U*1024*1024*1024 +	/* 2.5G max data size for */ \
     75 			 1U* 512*1024*1024)	/* bottom-up allocation */ \
     76 						/* could be a bit more */
     77 #endif
     78 #ifndef	DFLSSIZ
     79 #define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
     80 #endif
     81 #ifndef	MAXSSIZ
     82 #define	MAXSSIZ		(64*1024*1024)		/* max stack size */
     83 #endif
     84 
     85 /*
     86  * IA-32 can't do per-page execute permission, so instead we implement
     87  * two executable segments for %cs, one that covers everything and one
     88  * that excludes some of the address space (currently just the stack).
     89  * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment.
     90  */
     91 #define I386_MAX_EXE_ADDR	(USRSTACK - MAXSSIZ)
     92 
     93 /*
     94  * Size of User Raw I/O map
     95  */
     96 #define	USRIOSIZE 	300
     97 
     98 /*
     99  * Mach derived constants
    100  */
    101 
    102 /* user/kernel map constants */
    103 #define VM_MIN_ADDRESS		((vaddr_t)0)
    104 #define	VM_MAXUSER_ADDRESS	((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT))
    105 #define	VM_MAX_ADDRESS		\
    106 	((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT)))
    107 #define	VM_MIN_KERNEL_ADDRESS	((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT))
    108 #define	VM_MAX_KERNEL_ADDRESS	((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT))
    109 
    110 /*
    111  * The address to which unspecified mapping requests default
    112  */
    113 #ifdef _KERNEL_OPT
    114 #include "opt_uvm.h"
    115 #include "opt_xen.h"
    116 #endif
    117 #define __USE_TOPDOWN_VM
    118 #define VM_DEFAULT_ADDRESS_TOPDOWN(da, sz) \
    119     trunc_page(USRSTACK - MAXSSIZ - (sz))
    120 #define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
    121     round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU))
    122 
    123 /* XXX max. amount of KVM to be used by buffers. */
    124 #ifndef VM_MAX_KERNEL_BUF
    125 #define VM_MAX_KERNEL_BUF	(384 * 1024 * 1024)
    126 #endif
    127 
    128 /* virtual sizes (bytes) for various kernel submaps */
    129 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    130 
    131 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
    132 
    133 #ifdef XEN
    134 #define	VM_PHYSSEG_MAX		1
    135 #define	VM_NFREELIST		1
    136 #else
    137 #define	VM_PHYSSEG_MAX		32	/* 1 "hole" + 31 free lists */
    138 #define	VM_NFREELIST		2
    139 #define	VM_FREELIST_FIRST16	1
    140 #endif /* XEN */
    141 #define	VM_FREELIST_DEFAULT	0
    142 
    143 #endif /* _I386_VMPARAM_H_ */
    144