vmparam.h revision 1.1 
1/*	$NetBSD: vmparam.h,v 1.1 2013/07/18 22:08:59 matt Exp $	*/
2/*-
3 * Copyright (c) 2013 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Matt Thomas of 3am Software Foundry.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef _EVBCF_VMPARAM_H_
32#define _EVBCF_VMPARAM_H_
33
34/*
35 * Machine dependent VM constants for EVBCF (Coldfire)
36 */
37
38/*
39 * We use 4K pages on coldfire.  Override the PAGE_* definitions
40 * to be compile-time constants.
41 */
42#define	PAGE_SHIFT	PGSHIFT
43#define	PAGE_SIZE	(1 << PAGE_SHIFT)
44#define	PAGE_MASK	(PAGE_SIZE - 1)
45
46/*
47 * USRSTACK is the top (end) of the user stack.
48 */
49#define	USRSTACK	VM_MAXUSER_ADDRESS	/* Start of user stack */
50
51/*
52 * Virtual memory related constants, all in bytes
53 */
54#ifndef MAXTSIZ
55#define	MAXTSIZ		(16*1024*1024)		/* max text size */
56#endif
57#ifndef DFLDSIZ
58#define	DFLDSIZ		(64*1024*1024)		/* initial data size limit */
59#endif
60#ifndef MAXDSIZ
61#define	MAXDSIZ		(128*1024*1024)		/* max data size */
62#endif
63#ifndef	DFLSSIZ
64#define	DFLSSIZ		(512*1024)		/* initial stack size limit */
65#endif
66#ifndef	MAXSSIZ
67#define	MAXSSIZ		(16*1024*1024)		/* max stack size */
68#endif
69
70/*
71 * PTEs for mapping user space into the kernel for phyio operations.
72 * One page is enough to handle 4MB of simultaneous raw IO operations.
73 */
74#ifndef USRIOSIZE
75#define USRIOSIZE	(1 * NPTEPG)		/* 4MB */
76#endif
77
78/* user/kernel map constants */
79#define VM_MIN_ADDRESS		((vaddr_t)0)
80#define VM_MAXUSER_ADDRESS	((vaddr_t)0xBFF00000)
81#define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
82#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0xC0000000)
83#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)-PAGE_SIZE)
84
85/* virtual sizes (bytes) for various kernel submaps */
86#define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
87
88/*
89 * Constants which control the way the VM system deals with memory segments.
90 * The evbcf port has one physical memory segment.
91 */
92#define	VM_PHYSSEG_MAX		1
93#define	VM_PHYSSEG_STRAT	VM_PSTRAT_RANDOM
94
95#define	VM_NFREELIST		1
96#define	VM_FREELIST_DEFAULT	0
97
98#endif /* _EVBCF_VMPARAM_H_ */
99