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vmparam.h revision 1.6 
      1 /*	$NetBSD: vmparam.h,v 1.6 2002/03/03 11:22:58 chris Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef	_ARM32_VMPARAM_H_
     37 #define	_ARM32_VMPARAM_H_
     38 
     39 #ifdef _KERNEL
     40 
     41 #include <arm/arm32/vmparam.h>
     42 
     43 /*
     44  * Address space constants
     45  */
     46 
     47 /*
     48  * The line between user space and kernel space
     49  * Mappings >= KERNEL_SPACE_START are constant across all processes
     50  */
     51 #define	KERNEL_SPACE_START	0xf0000000
     52 
     53 /* Various constants used by the MD code*/
     54 #define	KERNEL_BASE		0xf0000000
     55 #define	KERNEL_TEXT_BASE	KERNEL_BASE
     56 #define	ALT_PAGE_TBLS_BASE	0xf0c00000
     57 #define	KERNEL_VM_BASE		0xf1000000
     58 /*
     59  * The Kernel VM Size varies depending on the machine depending on how
     60  * much space is needed (and where) for other mappings.
     61  * In some cases the chosen value may not be the maximum in order that
     62  * we don't waste memory with kernel pages tables as we can't currently
     63  * grow the kernel page tables after booting.
     64  * You only need to increase these values if you find that the number of
     65  * buffers is being limited due to lack of VA space.
     66  */
     67 /*
     68  * The range 0xf1000000 - 0xf5ffffff is available for kernel VM space
     69  * Fixed mappings exist from 0xf6000000 - 0xffffffff
     70  */
     71 #define	KERNEL_VM_SIZE		0x05000000
     72 
     73 #define	PROCESS_PAGE_TBLS_BASE	PAGE_TABLE_SPACE_START
     74 
     75 /*
     76  * Override the default pager_map size, there's not enough KVA.
     77  */
     78 #define PAGER_MAP_SIZE		(4 * 1024 * 1024)
     79 
     80 /*
     81  * Size of User Raw I/O map
     82  */
     83 
     84 #define USRIOSIZE       300
     85 
     86 /* XXX max. amount of KVM to be used by buffers. */
     87 #ifndef VM_MAX_KERNEL_BUF
     88 #define VM_MAX_KERNEL_BUF \
     89 	((KERNEL_VM_SIZE) * 4 / 10)
     90 #endif
     91 
     92 /* virtual sizes (bytes) for various kernel submaps */
     93 
     94 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
     95 
     96 /*
     97  * max number of non-contig chunks of physical RAM you can have
     98  */
     99 
    100 #define	VM_PHYSSEG_MAX		32
    101 
    102 /*
    103  * when converting a physical address to a vm_page structure, we
    104  * want to use a binary search on the chunks of physical memory
    105  * to find our RAM
    106  */
    107 
    108 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
    109 
    110 /*
    111  * this indicates that we can't add RAM to the VM system after the
    112  * vm system is init'd.
    113  */
    114 
    115 #define	VM_PHYSSEG_NOADD
    116 
    117 /*
    118  * we support 2 free lists:
    119  *
    120  *	- DEFAULT for all systems
    121  *	- ISADMA for the ISA DMA range on Sharks only
    122  *	- RPCDMA for the DMA range on RiscPC's + Kinetic cards
    123  */
    124 
    125 #define	VM_NFREELIST		2
    126 #define	VM_FREELIST_DEFAULT	0
    127 #define	VM_FREELIST_ISADMA	1
    128 #define VM_FREELIST_RPCDMA	1
    129 
    130 #endif /* _KERNEL */
    131 
    132 #endif	/* _ARM32_VMPARAM_H_ */
    133