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      1 /*	$NetBSD: param.h,v 1.36 2026/05/12 02:16:27 thorpej 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 #if defined(__mc68010__)
     52 #define	_MACHINE_ARCH	m68000
     53 #define	MACHINE_ARCH	"m68000"
     54 #else
     55 #define	_MACHINE_ARCH	m68k
     56 #define	MACHINE_ARCH	"m68k"
     57 #endif /* __mc68010__ */
     58 
     59 #ifndef	MID_MACHINE
     60 #define	MID_MACHINE	MID_M68K
     61 #endif
     62 
     63 #ifndef _KERNEL
     64 #undef MACHINE
     65 #define MACHINE "m68k"
     66 #endif
     67 
     68 #if defined(_KERNEL) || defined(_STANDALONE)
     69 
     70 	/* XXX this is still needed by the coredump module */
     71 #define	USPACE		8192		/* sizeof kernel stack + pcb */
     72 
     73 #if !defined(_MODULE)
     74 
     75 #ifndef KERNBASE
     76 #define	KERNBASE	0x00000000	/* start of kernel virtual */
     77 #endif
     78 
     79 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     80 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     81 
     82 #define	UPAGES		(USPACE >> PGSHIFT)
     83 
     84 #ifndef MSGBUFSIZE
     85 #define MSGBUFSIZE	8192		/* default message buffer size */
     86 #endif
     87 
     88 #if defined(__mc68010__)
     89 /*
     90  * Clamp UBC parameters; the default consume way to much kernel VA space,
     91  * and it's in short supply on 68010.  (Actually, the defaults exceed the
     92  * total available on the 68010.)
     93  *
     94  * XXX Perhaps these can be tuned upwards eventually?
     95  */
     96 #define	UBC_WINSHIFT	13		/* 8KB */
     97 #define	UBC_NWINS	32		/* -> 256KB */
     98 
     99 /*
    100  * Limit the number of concurrent exec(2) calls on 68010, as they
    101  * consume kernel VA space.
    102  */
    103 #define	MAXEXEC		1
    104 #endif /* __mc68010__ */
    105 
    106 /*
    107  * Mach-derived conversion macros
    108  */
    109 #define	m68k_round_page(x)	((((vaddr_t)(x)) + PGOFSET) & ~PGOFSET)
    110 #define	m68k_trunc_page(x)	((vaddr_t)(x) & ~PGOFSET)
    111 #define	m68k_page_offset(x)	((vaddr_t)(x) & PGOFSET)
    112 #define	m68k_btop(x)		((vaddr_t)(x) >> PGSHIFT)
    113 #define	m68k_ptob(x)		((vaddr_t)(x) << PGSHIFT)
    114 
    115 #endif /* _MODULE */
    116 
    117 #endif /* _KERNEL || _STANDALONE */
    118 
    119 /*
    120  * Constants related to network buffer management.
    121  * MCLBYTES must be no larger than NBPG (the software page size), and,
    122  * on machines that exchange pages of input or output buffers with mbuf
    123  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    124  * of the hardware page size.
    125  */
    126 #define	MSIZE		256		/* size of an mbuf */
    127 
    128 #ifndef MCLSHIFT
    129 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    130 					/* 2K cluster can hold Ether frame */
    131 #endif	/* MCLSHIFT */
    132 
    133 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    134 
    135 #if defined(_KERNEL)
    136 void	delay(unsigned int);
    137 #define	DELAY(us)	delay(us)
    138 
    139 /* Default audio blocksize in msec.  See sys/dev/audio/audio.c */
    140 #define	__AUDIO_BLK_MS (40)
    141 #endif
    142 
    143 #endif	/* !_M68K_PARAM_H_ */
    144