param.h revision 1.18 
1/*	$NetBSD: param.h,v 1.18 2012/02/04 17:56:16 para 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#define	PGSHIFT		12		/* LOG2(NBPG) */
41#define	NBPG		(1 << PGSHIFT)	/* bytes/page */
42#define	PGOFSET		(NBPG-1)	/* byte offset into page */
43
44#define	SEGSHIFT	(PGSHIFT + (PGSHIFT-PTESHIFT))	/* LOG2(NBSEG) */
45#define NBSEG		(1 << SEGSHIFT)	/* bytes/segment (quadrant) */
46#define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
47
48#define	KERNBASE	0x00000000	/* start of kernel virtual */
49#define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
50
51#define	DEV_BSIZE	512
52#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
53#define BLKDEV_IOSIZE	2048
54#define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
55
56#define	SSIZE		(1)		/* initial stack size/NBPG */
57#define	SINCR		(1)		/* increment of stack/NBPG */
58
59#ifdef DIAGNOSTIC
60#define	UPAGES		5		/* pages of u-area + redzone */
61#else
62#define	UPAGES		4		/* pages of u-area */
63#endif
64#define	USPACE		(UPAGES * NBPG)	/* pages for user struct and kstack */
65
66#ifndef	MSGBUFSIZE
67#define	MSGBUFSIZE	2*NBPG		/* default message buffer size */
68#endif
69
70/*
71 * Constants related to network buffer management.
72 * MCLBYTES must be no larger than the software page size, and,
73 * on machines that exchange pages of input or output buffers with mbuf
74 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
75 * of the hardware page size.
76 */
77#define	MSIZE		256		/* size of an mbuf */
78#define	MCLSHIFT	11
79#define	MCLBYTES	(1 << MCLSHIFT)	/* large enough for ether MTU */
80#define	MCLOFSET	(MCLBYTES - 1)
81
82/*
83 * Size of kernel malloc arena in logical pages
84 */
85#define NKMEMPAGES_MIN_DEFAULT  ((16 * 1024 * 1024) >> PAGE_SHIFT)
86#define NKMEMPAGES_MAX_DEFAULT  ((128 * 1024 * 1024) >> PAGE_SHIFT)
87
88/*
89 * Mach derived conversion macros
90 */
91
92#define btop(x)		((unsigned long)(x) >> PGSHIFT)
93#define ptob(x)		((unsigned long)(x) << PGSHIFT)
94