param.h revision 1.15 
1/*	$NetBSD: param.h,v 1.15 2010/02/08 19:02:29 joerg Exp $	*/
2
3/*	$OpenBSD: param.h,v 1.12 2001/07/06 02:07:41 provos Exp $	*/
4
5/*
6 * Copyright (c) 1988-1994, The University of Utah and
7 * the Computer Systems Laboratory at the University of Utah (CSL).
8 * All rights reserved.
9 *
10 * Permission to use, copy, modify and distribute this software is hereby
11 * granted provided that (1) source code retains these copyright, permission,
12 * and disclaimer notices, and (2) redistributions including binaries
13 * reproduce the notices in supporting documentation, and (3) all advertising
14 * materials mentioning features or use of this software display the following
15 * acknowledgement: ``This product includes software developed by the
16 * Computer Systems Laboratory at the University of Utah.''
17 *
18 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
19 * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
20 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
21 *
22 * CSL requests users of this software to return to csl-dist@cs.utah.edu any
23 * improvements that they make and grant CSL redistribution rights.
24 *
25 * 	Utah $Hdr: param.h 1.18 94/12/16$
26 */
27
28#ifdef _KERNEL
29#include <machine/cpu.h>
30#endif
31
32/*
33 * Machine dependent constants for PA-RISC.
34 */
35
36#define	_MACHINE_ARCH	hppa
37#define	MACHINE_ARCH	"hppa"
38#define	MID_MACHINE	MID_HPPA
39
40/*
41 * Round p (pointer or byte index) up to a correctly-aligned value for all
42 * data types (int, long, ...).   The result is u_int and must be cast to
43 * any desired pointer type.
44 */
45#define	ALIGNBYTES	7
46#define	ALIGN(p)	(((u_long)(p) + ALIGNBYTES) &~ ALIGNBYTES)
47#define	ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t) - 1)) == 0)
48
49#define	PGSHIFT		12		/* LOG2(NBPG) */
50#define	NBPG		(1 << PGSHIFT)	/* bytes/page */
51#define	PGOFSET		(NBPG-1)	/* byte offset into page */
52
53#define	SEGSHIFT	(PGSHIFT + (PGSHIFT-PTESHIFT))	/* LOG2(NBSEG) */
54#define NBSEG		(1 << SEGSHIFT)	/* bytes/segment (quadrant) */
55#define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
56
57#define	KERNBASE	0x00000000	/* start of kernel virtual */
58#define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
59
60#define	DEV_BSIZE	512
61#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
62#define BLKDEV_IOSIZE	2048
63#define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
64
65#define	SSIZE		(1)		/* initial stack size/NBPG */
66#define	SINCR		(1)		/* increment of stack/NBPG */
67
68#ifdef DIAGNOSTIC
69#define	UPAGES		5		/* pages of u-area + redzone */
70#else
71#define	UPAGES		4		/* pages of u-area */
72#endif
73#define	USPACE		(UPAGES * NBPG)	/* pages for user struct and kstack */
74
75#ifndef	MSGBUFSIZE
76#define	MSGBUFSIZE	2*NBPG		/* default message buffer size */
77#endif
78
79/*
80 * Constants related to network buffer management.
81 * MCLBYTES must be no larger than the software page size, and,
82 * on machines that exchange pages of input or output buffers with mbuf
83 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
84 * of the hardware page size.
85 */
86#define	MSIZE		256		/* size of an mbuf */
87#define	MCLSHIFT	11
88#define	MCLBYTES	(1 << MCLSHIFT)	/* large enough for ether MTU */
89#define	MCLOFSET	(MCLBYTES - 1)
90
91/*
92 * Size of kernel malloc arena in logical pages
93 */
94#define NKMEMPAGES_MIN_DEFAULT  ((16 * 1024 * 1024) >> PAGE_SHIFT)
95#define NKMEMPAGES_MAX_DEFAULT  ((16 * 1024 * 1024) >> PAGE_SHIFT)
96
97/*
98 * Mach derived conversion macros
99 */
100
101#define btop(x)		((unsigned long)(x) >> PGSHIFT)
102#define ptob(x)		((unsigned long)(x) << PGSHIFT)
103