param.h revision 1.19 
1/*	$NetBSD: param.h,v 1.19 2005/12/11 12:18:43 christos Exp $	*/
2
3/*-
4 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
5 * Copyright (C) 1995, 1996 TooLs GmbH.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#ifndef _POWERPC_PARAM_H
35#define	_POWERPC_PARAM_H
36
37#ifdef	_KERNEL
38#if defined(_KERNEL_OPT)
39#include "opt_ppcarch.h"
40#endif
41#ifndef	_LOCORE
42#include <machine/cpu.h>
43#endif	/* _LOCORE */
44#endif
45
46/*
47 * Machine dependent constants for PowerPC (32-bit only currently)
48 */
49#ifndef MACHINE
50#define	MACHINE		"powerpc"
51#endif
52#define	MACHINE_ARCH	"powerpc"
53#define	MID_MACHINE	MID_POWERPC
54
55#define	ALIGNBYTES		(sizeof(double) - 1)
56#define	ALIGN(p)		(((u_long)(p) + ALIGNBYTES) & ~ALIGNBYTES)
57#define	ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
58
59#ifdef PPC_IBM4XX
60#define	PGSHIFT		14	/* Use 16KB to reduce TLB thrashing */
61#define	UPAGES		1
62#else
63#define	PGSHIFT		12
64#define	UPAGES		4
65#endif
66#define	NBPG		(1 << PGSHIFT)	/* Page size */
67#define	PGOFSET		(NBPG - 1)
68
69#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
70#define	DEV_BSIZE	(1 << DEV_BSHIFT)
71#define	BLKDEV_IOSIZE	NBPG
72#ifndef MAXPHYS
73#define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
74#endif
75
76#define	USPACE		(UPAGES * NBPG)
77
78#ifndef	MSGBUFSIZE
79#define	MSGBUFSIZE	(2*NBPG)	/* default message buffer size */
80#endif
81
82#ifndef KERNBASE
83#define	KERNBASE	0x100000
84#endif
85
86/*
87 * Constants related to network buffer management.
88 * MCLBYTES must be no larger than NBPG (the software page size), and,
89 * on machines that exchange pages of input or output buffers with mbuf
90 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
91 * of the hardware page size.
92 */
93#ifndef MSIZE
94#define	MSIZE		256		/* size of an mbuf */
95#endif
96#ifndef MCLSHIFT
97#define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
98#endif
99#define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
100
101#ifndef NMBCLUSTERS
102
103#if defined(_KERNEL_OPT)
104#include "opt_gateway.h"
105#endif
106
107#ifdef GATEWAY
108#define	NMBCLUSTERS	2048		/* map size, max cluster allocation */
109#else
110#define	NMBCLUSTERS	1024		/* map size, max cluster allocation */
111#endif
112#endif
113
114/*
115 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
116 * logical pages.
117 */
118#ifndef NKMEMPAGES_MIN_DEFAULT
119#define	NKMEMPAGES_MIN_DEFAULT	((16 * 1024 * 1024) >> PAGE_SHIFT)
120#endif
121#ifndef NKMEMPAGES_MAX_DEFAULT
122#define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
123#endif
124
125/*
126 * pages ("clicks") to disk blocks
127 */
128#define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
129#define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
130/*
131 * bytes to pages
132 */
133#define	ctob(x)		((x) << PGSHIFT)
134#define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
135
136/*
137 * bytes to disk blocks
138 */
139#define	dbtob(x)	((x) << DEV_BSHIFT)
140#define	btodb(x)	((x) >> DEV_BSHIFT)
141
142#endif /* _POWERPC_PARAM_H_ */
143