param.h revision 1.22 
1/*	$NetBSD: param.h,v 1.22 2019/01/07 22:00:31 jdolecek 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	hppa
37#define	MACHINE		"hppa"
38#define	_MACHINE_ARCH	hppa
39#define	MACHINE_ARCH	"hppa"
40#define	MID_MACHINE	MID_HPPA
41
42#define	PGSHIFT		12		/* LOG2(NBPG) */
43#define	NBPG		(1 << PGSHIFT)	/* bytes/page */
44#define	PGOFSET		(NBPG-1)	/* byte offset into page */
45
46#define	SEGSHIFT	(PGSHIFT + (PGSHIFT-PTESHIFT))	/* LOG2(NBSEG) */
47#define NBSEG		(1 << SEGSHIFT)	/* bytes/segment (quadrant) */
48#define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
49
50#define	KERNBASE	0x00000000	/* start of kernel virtual */
51#define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
52
53#define	SSIZE		(1)		/* initial stack size/NBPG */
54#define	SINCR		(1)		/* increment of stack/NBPG */
55
56#ifdef DIAGNOSTIC
57#define	UPAGES		5		/* pages of u-area + redzone */
58#else
59#define	UPAGES		4		/* pages of u-area */
60#endif
61#define	USPACE		(UPAGES * NBPG)	/* pages for user struct and kstack */
62
63#ifndef	MSGBUFSIZE
64#define	MSGBUFSIZE	(2*NBPG)	/* default message buffer size */
65#endif
66
67/*
68 * Constants related to network buffer management.
69 * MCLBYTES must be no larger than the software page size, and,
70 * on machines that exchange pages of input or output buffers with mbuf
71 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
72 * of the hardware page size.
73 */
74#define	MSIZE		256		/* size of an mbuf */
75#define	MCLSHIFT	11
76#define	MCLBYTES	(1 << MCLSHIFT)	/* large enough for ether MTU */
77#define	MCLOFSET	(MCLBYTES - 1)
78
79/*
80 * Size of kernel malloc arena in logical pages
81 */
82#define NKMEMPAGES_MIN_DEFAULT  ((16 * 1024 * 1024) >> PAGE_SHIFT)
83#define NKMEMPAGES_MAX_DEFAULT  ((256 * 1024 * 1024) >> PAGE_SHIFT)
84
85/*
86 * Mach derived conversion macros
87 */
88
89#define btop(x)		((unsigned long)(x) >> PGSHIFT)
90#define ptob(x)		((unsigned long)(x) << PGSHIFT)
91