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param.h revision 1.21 
      1 /*	$NetBSD: param.h,v 1.21 2015/10/27 22:28:56 mrg 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 #endif
     31 
     32 /*
     33  * Machine dependent constants for PA-RISC.
     34  */
     35 
     36 #define	_MACHINE	hppa
     37 #define	MACHINE		"hppa"
     38 #define	_MACHINE_ARCH	hppa
     39 #define	MACHINE_ARCH	"hppa"
     40 #define	MID_MACHINE	MID_HPPA
     41 
     42 #define	PGSHIFT		12		/* LOG2(NBPG) */
     43 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     44 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     45 
     46 #define	SEGSHIFT	(PGSHIFT + (PGSHIFT-PTESHIFT))	/* LOG2(NBSEG) */
     47 #define NBSEG		(1 << SEGSHIFT)	/* bytes/segment (quadrant) */
     48 #define	SEGOFSET	(NBSEG-1)	/* byte offset into segment */
     49 
     50 #define	KERNBASE	0x00000000	/* start of kernel virtual */
     51 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
     52 
     53 #define	DEV_BSIZE	512
     54 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     55 #define BLKDEV_IOSIZE	2048
     56 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     57 
     58 #define	SSIZE		(1)		/* initial stack size/NBPG */
     59 #define	SINCR		(1)		/* increment of stack/NBPG */
     60 
     61 #ifdef DIAGNOSTIC
     62 #define	UPAGES		5		/* pages of u-area + redzone */
     63 #else
     64 #define	UPAGES		4		/* pages of u-area */
     65 #endif
     66 #define	USPACE		(UPAGES * NBPG)	/* pages for user struct and kstack */
     67 
     68 #ifndef	MSGBUFSIZE
     69 #define	MSGBUFSIZE	(2*NBPG)	/* default message buffer size */
     70 #endif
     71 
     72 /*
     73  * Constants related to network buffer management.
     74  * MCLBYTES must be no larger than the software page size, and,
     75  * on machines that exchange pages of input or output buffers with mbuf
     76  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     77  * of the hardware page size.
     78  */
     79 #define	MSIZE		256		/* size of an mbuf */
     80 #define	MCLSHIFT	11
     81 #define	MCLBYTES	(1 << MCLSHIFT)	/* large enough for ether MTU */
     82 #define	MCLOFSET	(MCLBYTES - 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