1/*	$NetBSD: param.h,v 1.24 2021/05/31 14:38:55 simonb Exp $	*/
2
3/*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: Utah $Hdr: machparam.h 1.16 92/12/20$
37 *
38 *	@(#)param.h	8.1 (Berkeley) 6/10/93
39 */
40
41#ifndef _M68K_PARAM_H_
42#define _M68K_PARAM_H_
43
44#ifdef _KERNEL_OPT
45#include "opt_param.h"
46#endif
47
48/*
49 * Machine independent constants for m68k
50 */
51#ifndef	MACHINE_ARCH
52#define	_MACHINE_ARCH	m68k
53#define	MACHINE_ARCH	"m68k"
54#endif
55#ifndef	MID_MACHINE
56#define	MID_MACHINE	MID_M68K
57#endif
58#ifndef _KERNEL
59#undef MACHINE
60#define MACHINE "m68k"
61#endif
62
63#define	NBPG		(1 << PGSHIFT)	/* bytes/page */
64#define	PGOFSET		(NBPG-1)	/* byte offset into page */
65
66#define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
67
68#define	SSIZE		1		/* initial stack size/NBPG */
69#define	SINCR		1		/* increment of stack/NBPG */
70
71#define	USPACE		(UPAGES * NBPG)
72
73#ifndef MSGBUFSIZE
74#define MSGBUFSIZE	NBPG		/* default message buffer size */
75#endif
76
77/*
78 * Constants related to network buffer management.
79 * MCLBYTES must be no larger than NBPG (the software page size), and,
80 * on machines that exchange pages of input or output buffers with mbuf
81 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
82 * of the hardware page size.
83 */
84#define	MSIZE		256		/* size of an mbuf */
85
86#ifndef MCLSHIFT
87#define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
88					/* 2K cluster can hold Ether frame */
89#endif	/* MCLSHIFT */
90
91#define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
92
93/*
94 * Mach-derived conversion macros
95 */
96#define	m68k_round_page(x)	((((vaddr_t)(x)) + PGOFSET) & ~PGOFSET)
97#define	m68k_trunc_page(x)	((vaddr_t)(x) & ~PGOFSET)
98#define	m68k_page_offset(x)	((vaddr_t)(x) & PGOFSET)
99#define	m68k_btop(x)		((vaddr_t)(x) >> PGSHIFT)
100#define	m68k_ptob(x)		((vaddr_t)(x) << PGSHIFT)
101
102/* Default audio blocksize in msec.  See sys/dev/audio/audio.c */
103#if defined(_KERNEL)
104#define	__AUDIO_BLK_MS (40)
105#endif
106
107#endif	/* !_M68K_PARAM_H_ */
108