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Pull up following revision(s) (requested by isaki in ticket #911):

	sys/dev/audio/audiodef.h: revision 1.13
	sys/dev/audio/audiodef.h: revision 1.14
	sys/arch/sparc/include/param.h: revision 1.74
	sys/arch/evbarm/conf/GENERIC64: revision 1.148
	sys/arch/sh3/include/param.h: revision 1.25
	sys/arch/evbarm/conf/GENERIC: revision 1.75
	sys/arch/m68k/include/param.h: revision 1.23
	sys/arch/amd64/conf/GENERIC: revision 1.564
	sys/arch/hppa/include/param.h: revision 1.27
	sys/dev/audio/audio.c: revision 1.68
	sys/arch/vax/include/param.h: revision 1.63
	sys/dev/audio/audio.c: revision 1.69

Reduce default AUDIO_BLK_MS from 40msec to 10msec on all platform except m68k
(m68k uses 40msec default as before).  And remove the option from GENERIC.

- It's not good idea to set such parameter in individual GENERICs.
- 4msec is (probably no problem for most modern real hardware but)
  too aggressive to be default.
- 10msec is too severe for antique machines but it's hard to draw a line.

Set AUDIO_BLK_MS 40 msec on other old(slow) architectures not only m68k.

Thanks tsutsui@ for comment about architecture choice.
And move it from audiodef.h to audio.c as suggested by joerg@.


Move machine dependent AUDIO_BLK_MS default value to <machine/param.h>.
If the port has __AUDIO_BLK_MS in <machine/param.h>, it will be used.

Otherwise the default value (currently 10 msec) defined in audio.c will
be used.  This mechanism is for very old ports which cannot satisfactorily
handle 10 msec block.  Currently hppa, m68k, sh3, sparc(!64) and vax are.

For port maintainers, if general models in your port cannot satisfactorily
handle 10 msec block, please consider to define your suitable longer period
(40 msec would be a good first choice).

But please don't be eager to make the default value shorter.
<machine/param.h> was discussed in source-changes-d.  It's better than
ifdef storm, or adding 60+ new header files in every arch/*/include/
directories for this.  Thanks mrg@, ad@, and everyone.
http://mail-index.netbsd.org/source-changes-d/2020/05/01/msg012572.html

/*	$NetBSD: param.h,v 1.24.4.1 2020/05/18 18:12:25 martin Exp $	*/

/*-
 * Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved.
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)param.h	5.8 (Berkeley) 6/28/91
 */

/*
 * SuperH dependent constants.
 */

#ifndef _SH3_PARAM_H_
#define	_SH3_PARAM_H_

#if defined(_KERNEL) && !defined(_LOCORE)
#include <machine/cpu.h>
#endif

/* NetBSD/sh3 is 4KB page */
#define	PGSHIFT			12
#define	NBPG			(1 << PGSHIFT)
#define	PGOFSET			(NBPG - 1)

/*
 * u-space.
 */
#define	UPAGES		3		/* pages of u-area */
#define	USPACE		(UPAGES * NBPG)	/* total size of u-area */
#if UPAGES == 1
#error "too small u-area"
#elif UPAGES == 2
#define	P1_STACK	/* kernel stack is P1-area */
#else
#undef	P1_STACK	/* kernel stack is P3-area */
#endif

#ifndef MSGBUFSIZE
#define	MSGBUFSIZE	NBPG		/* default message buffer size */
#endif

/*
 * Constants related to network buffer management.
 * MCLBYTES must be no larger than NBPG (the software page size), and,
 * on machines that exchange pages of input or output buffers with mbuf
 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 * of the hardware page size.
 */
#define	MSIZE		256		/* size of an mbuf */

#ifndef MCLSHIFT
#define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
					/* 2K cluster can hold Ether frame */
#endif	/* MCLSHIFT */

#define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */

/*
 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
 * logical pages.
 */
#define	NKMEMPAGES_MIN_DEFAULT	((16 * 1024 * 1024) >> PAGE_SHIFT)
#define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)

/* Default audio blocksize in msec.  See sys/dev/audio/audio.c */
#if defined(_KERNEL)
#define	__AUDIO_BLK_MS (40)
#endif

#endif /* !_SH3_PARAM_H_ */