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      1 /* $NetBSD: param.h,v 1.53 2026/05/10 16:07:55 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  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 and Ralph Campbell.
     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 $Hdr: machparam.h 1.11 89/08/14$
     37  *
     38  *	@(#)param.h	8.1 (Berkeley) 6/10/93
     39  */
     40 
     41 #ifdef _KERNEL_OPT
     42 #include "opt_param.h"
     43 #endif
     44 
     45 /*
     46  * Machine dependent constants for the Alpha.
     47  */
     48 #define	_MACHINE	alpha
     49 #define	MACHINE		"alpha"
     50 #define	_MACHINE_ARCH	alpha
     51 #define	MACHINE_ARCH	"alpha"
     52 #define	MID_MACHINE	MID_ALPHA
     53 
     54 #ifdef _KERNEL
     55 #include <machine/cpu.h>
     56 #else
     57 #define ALPHA_PGSHIFT	13
     58 #endif
     59 
     60 /*
     61  * Compiler assumes 16 byte stack alignment, per recommendation of
     62  * Alpha Architecture Handbook.
     63  */
     64 #define	STACK_ALIGNBYTES	(16 - 1)
     65 
     66 #define	NBPG		(1 << ALPHA_PGSHIFT)		/* bytes/page */
     67 #define	PGOFSET		(NBPG-1)			/* byte off. into pg */
     68 #define	PGSHIFT		ALPHA_PGSHIFT			/* LOG2(NBPG) */
     69 
     70 #define	KERNBASE	0xfffffc0000a00000	/* start of kernel virtual */
     71 
     72 #define	UPAGES		2			/* pages of u-area */
     73 #define	USPACE		(UPAGES * NBPG)		/* total size of u-area */
     74 
     75 #ifndef MSGBUFSIZE
     76 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     77 #endif
     78 
     79 /*
     80  * EV4 (21064) and EV5 (21164) have a 32-byte cache line size.
     81  * EV6 (21264) and EV7 (21364) have a 64-byte cache line size.
     82  */
     83 
     84 /*
     85  * Constants related to network buffer management.
     86  * MCLBYTES must be no larger than NBPG (the software page size), and,
     87  * on machines that exchange pages of input or output buffers with mbuf
     88  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     89  * of the hardware page size.
     90  */
     91 #define	MSIZE		256		/* size of an mbuf */
     92 
     93 #ifndef MCLSHIFT
     94 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     95 					/* 2K cluster can hold Ether frame */
     96 #endif	/* MCLSHIFT */
     97 
     98 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     99 
    100 /*
    101  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    102  * logical pages.
    103  * No enforced maximum on alpha
    104  */
    105 #define	NKMEMPAGES_MIN_DEFAULT	((16 * 1024 * 1024) >> PAGE_SHIFT)
    106 #define	NKMEMPAGES_MAX_UNLIMITED	1
    107 
    108 /*
    109  * Mach derived conversion macros
    110  */
    111 #define	alpha_round_page(x)	((((unsigned long)(x)) + NBPG - 1) & ~(NBPG-1))
    112 #define	alpha_trunc_page(x)	((unsigned long)(x) & ~(NBPG-1))
    113 #define	alpha_btop(x)		((unsigned long)(x) >> PGSHIFT)
    114 #define	alpha_ptob(x)		((unsigned long)(x) << PGSHIFT)
    115 
    116 #ifdef _KERNEL
    117 #ifndef _LOCORE
    118 
    119 #include <machine/intr.h>
    120 
    121 #ifndef __HIDE_DELAY
    122 void	delay(unsigned long);
    123 #define	DELAY(n)	delay(n)
    124 #endif
    125 
    126 #endif
    127 #endif /* !_KERNEL */
    128