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      1 /*	$NetBSD: param.h,v 1.31 2025/04/20 22:32:49 riastradh Exp $	*/
      2 
      3 /*	$OpenBSD: param.h,v 1.12 2001/07/06 02:07:41 provos Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 1988-1994, The University of Utah and
      7  * the Computer Systems Laboratory at the University of Utah (CSL).
      8  * All rights reserved.
      9  *
     10  * Permission to use, copy, modify and distribute this software is hereby
     11  * granted provided that (1) source code retains these copyright, permission,
     12  * and disclaimer notices, and (2) redistributions including binaries
     13  * reproduce the notices in supporting documentation, and (3) all advertising
     14  * materials mentioning features or use of this software display the following
     15  * acknowledgement: ``This product includes software developed by the
     16  * Computer Systems Laboratory at the University of Utah.''
     17  *
     18  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
     19  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
     20  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     21  *
     22  * CSL requests users of this software to return to csl-dist (at) cs.utah.edu any
     23  * improvements that they make and grant CSL redistribution rights.
     24  *
     25  * 	Utah $Hdr: param.h 1.18 94/12/16$
     26  */
     27 
     28 #ifdef _KERNEL
     29 #include <machine/cpu.h>
     30 #ifdef _KERNEL_OPT
     31 #include "opt_param.h"
     32 #endif
     33 #endif
     34 
     35 /*
     36  * Machine dependent constants for PA-RISC.
     37  */
     38 
     39 #define	_MACHINE	hppa
     40 #define	MACHINE		"hppa"
     41 #define	_MACHINE_ARCH	hppa
     42 #define	MACHINE_ARCH	"hppa"
     43 #define	MID_MACHINE	MID_HPPA
     44 
     45 #define	PGSHIFT		12		/* LOG2(NBPG) */
     46 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     47 #define	PGOFSET		(NBPG - 1)	/* byte offset into page */
     48 
     49 #define	SEGSHIFT	(PGSHIFT + (PGSHIFT-PTESHIFT))	/* LOG2(NBSEG) */
     50 #define NBSEG		(1 << SEGSHIFT)	/* bytes/segment (quadrant) */
     51 #define	SEGOFSET	(NBSEG - 1)	/* byte offset into segment */
     52 
     53 #define	KERNBASE	0x00000000	/* start of kernel virtual */
     54 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
     55 
     56 #define	SSIZE		(1)		/* initial stack size/NBPG */
     57 #define	SINCR		(1)		/* increment of stack/NBPG */
     58 
     59 #ifdef DIAGNOSTIC
     60 #define	UPAGES		5		/* pages of u-area + redzone */
     61 #else
     62 #define	UPAGES		4		/* pages of u-area */
     63 #endif
     64 #define	USPACE		(UPAGES * NBPG)	/* pages for user struct and kstack */
     65 
     66 #ifndef	MSGBUFSIZE
     67 #define	MSGBUFSIZE	(4 * NBPG)	/* default message buffer size */
     68 #endif
     69 
     70 /*
     71  * Constants related to network buffer management.
     72  * MCLBYTES must be no larger than the software page size, and,
     73  * on machines that exchange pages of input or output buffers with mbuf
     74  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     75  * of the hardware page size.
     76  */
     77 #define	MSIZE		256		/* size of an mbuf */
     78 #define	MCLSHIFT	11
     79 #define	MCLBYTES	(1 << MCLSHIFT)	/* large enough for ether MTU */
     80 #define	MCLOFSET	(MCLBYTES - 1)
     81 
     82 #define	STACK_ALIGNBYTES	(64 - 1)
     83 
     84 /*
     85  * Size of kernel malloc arena in logical pages
     86  */
     87 #define NKMEMPAGES_MIN_DEFAULT  ((16 * 1024 * 1024) >> PAGE_SHIFT)
     88 #define NKMEMPAGES_MAX_DEFAULT  ((256 * 1024 * 1024) >> PAGE_SHIFT)
     89 
     90 /*
     91  * Mach derived conversion macros
     92  */
     93 
     94 #define btop(x)		((unsigned long)(x) >> PGSHIFT)
     95 #define ptob(x)		((unsigned long)(x) << PGSHIFT)
     96 
     97 /* Default audio blocksize in msec.  See sys/dev/audio/audio.c */
     98 #if defined(_KERNEL)
     99 #define	__AUDIO_BLK_MS (40)
    100 #endif
    101