/* $NetBSD: param.h,v 1.53 2026/05/10 16:07:55 thorpej Exp $ */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department and Ralph Campbell.
 *
 * 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.
 *
 * from: Utah $Hdr: machparam.h 1.11 89/08/14$
 *
 *      @(#)param.h     8.1 (Berkeley) 6/10/93
 */

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

/*
 * Machine dependent constants for the Alpha.
 */
#define _MACHINE        alpha
#define MACHINE         "alpha"
#define _MACHINE_ARCH   alpha
#define MACHINE_ARCH    "alpha"
#define MID_MACHINE     MID_ALPHA

#ifdef _KERNEL
#include <machine/cpu.h>
#else
#define ALPHA_PGSHIFT   13
#endif

/*
 * Compiler assumes 16 byte stack alignment, per recommendation of
 * Alpha Architecture Handbook.
 */
#define STACK_ALIGNBYTES        (16 - 1)

#define NBPG            (1 << ALPHA_PGSHIFT)            /* bytes/page */
#define PGOFSET         (NBPG-1)                        /* byte off. into pg */
#define PGSHIFT         ALPHA_PGSHIFT                   /* LOG2(NBPG) */

#define KERNBASE        0xfffffc0000a00000      /* start of kernel virtual */

#define UPAGES          2                       /* pages of u-area */
#define USPACE          (UPAGES * NBPG)         /* total size of u-area */

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

/*
 * EV4 (21064) and EV5 (21164) have a 32-byte cache line size.
 * EV6 (21264) and EV7 (21364) have a 64-byte cache line size.
 */

/*
 * 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.
 * No enforced maximum on alpha
 */
#define NKMEMPAGES_MIN_DEFAULT  ((16 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_UNLIMITED        1

/*
 * Mach derived conversion macros
 */
#define alpha_round_page(x)     ((((unsigned long)(x)) + NBPG - 1) & ~(NBPG-1))
#define alpha_trunc_page(x)     ((unsigned long)(x) & ~(NBPG-1))
#define alpha_btop(x)           ((unsigned long)(x) >> PGSHIFT)
#define alpha_ptob(x)           ((unsigned long)(x) << PGSHIFT)

#ifdef _KERNEL
#ifndef _LOCORE

#include <machine/intr.h>

#ifndef __HIDE_DELAY
void    delay(unsigned long);
#define DELAY(n)        delay(n)
#endif

#endif
#endif /* !_KERNEL */