/*      $NetBSD: param.h,v 1.64 2021/05/31 14:38:56 simonb Exp $    */
/*-
* 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
*/

#ifndef _VAX_PARAM_H_
#define _VAX_PARAM_H_

#ifdef _KERNEL_OPT
#include "opt_param.h"
#endif

/*
* Machine dependent constants for VAX.
*/

#define _MACHINE        vax
#define MACHINE         "vax"
#define _MACHINE_ARCH   vax
#define MACHINE_ARCH    "vax"
#define MID_MACHINE     MID_VAX

#define PGSHIFT         12                      /* LOG2(NBPG) */
#define NBPG            (1 << PGSHIFT)          /* (1 << PGSHIFT) bytes/page */
#define PGOFSET         (NBPG - 1)              /* byte offset into page */

#define VAX_PGSHIFT     9
#define VAX_NBPG        (1 << VAX_PGSHIFT)
#define VAX_PGOFSET     (VAX_NBPG - 1)
#define VAX_NPTEPG      (VAX_NBPG / 4)

#define KERNBASE        0x80000000              /* start of kernel virtual */

#define UPAGES          2               /* pages of u-area */
#define USPACE          (NBPG*UPAGES)
#define REDZONEADDR     (VAX_NBPG*3)    /* Must be > sizeof(struct pcb) */

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

/*
* KVA is very tight on vax, reduce the amount of KVA used by pipe
* "direct" write code to reasonably low value.
*/
#ifndef PIPE_DIRECT_CHUNK
#define PIPE_DIRECT_CHUNK       65536
#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  ((4 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT  ((4 * 1024 * 1024) >> PAGE_SHIFT)

/*
* Some macros for units conversion
*/

#define btop(x)         ((x) >> PGSHIFT)

/* MD conversion macros */
#define vax_btoc(x)     (((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT)
#define vax_btop(x)     (((unsigned)(x)) >> VAX_PGSHIFT)

#ifdef _KERNEL
#include <machine/intr.h>

/* Prototype needed for delay() */
#ifndef _LOCORE
void    delay(int);
/* inline macros used inside kernel */
#include <machine/macros.h>
#endif

#define DELAY(x) delay(x)
#define MAXEXEC 1

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

#endif /* _KERNEL */

#endif /* _VAX_PARAM_H_ */