* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
* @(#)param.h 7.7 (Berkeley) %G%
* Machine dependent constants for vax.
* Definitions for byte order,
* according to byte significance from low address to high.
#define LITTLE 1234 /* least-significant byte first (vax) */
#define BIG 4321 /* most-significant byte first */
#define PDP 3412 /* LSB first in word, MSW first in long (pdp) */
#define ENDIAN LITTLE /* byte order on vax */
* Macros for network/external number representation conversion.
#if ENDIAN == BIG && !defined(lint)
unsigned short ntohs(), htons();
unsigned long ntohl(), htonl();
#define KERNBASE 0x80000000 /* start of kernel virtual */
#define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT)
#define KERNBASE 0x80000000 /* start of kernel virtual */
#define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT)
#define NBPG 512 /* bytes/page */
#define PGOFSET (NBPG-1) /* byte offset into page */
#define PGSHIFT 9 /* LOG2(NBPG) */
#define NPTEPG (NBPG/(sizeof (struct pte)))
#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
#define BLKDEV_IOSIZE 2048
#define MAXPHYS (63 * 1024) /* max raw I/O transfer size */
* Devices without disk labels and the swap virtual device
* use "blocks" of exactly pagesize. Devices with disk labels
* use device-dependent sector sizes for block and character interfaces.
#define DEV_BSHIFT PGSHIFT /* log2(DEV_BSIZE) */
#define BLKDEV_IOSIZE NBPG /* NBPG for unlabeled block devices */
#define MAXPHYS (63 * 1024) /* max raw I/O transfer size */
#define SSIZE 4 /* initial stack size/NBPG */
#define SINCR 4 /* increment of stack/NBPG */
#define UPAGES 10 /* pages of u-area */
* Some macros for units conversion
/* Core clicks (512 bytes) to segments and vice versa */
/* Core clicks (512 bytes) to disk blocks */
#define dtob(x) ((x)<<PGSHIFT)
/* Core clicks (512 bytes) to disk blocks; deprecated */
#define ctod(x) (x) /* XXX */
#define dtoc(x) (x) /* XXX */
#define dtob(x) ((x)<<PGSHIFT) /* XXX */
#define btoc(x) ((((unsigned)(x)+511)>>9))
#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
((unsigned)(bytes) >> DEV_BSHIFT)
#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
((unsigned)(db) << DEV_BSHIFT)
* Map a ``block device block'' to a file system block.
* This should be device dependent, and will be if we
* add an entry to cdevsw/bdevsw for that purpose.
* For now though just use DEV_BSIZE.
#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
/* bytes to "disk blocks" and back; deprecated */
#define btodb(bytes) ((unsigned)(bytes) >> DEV_BSHIFT) /* XXX */
#define dbtob(db) ((unsigned)(db) << DEV_BSHIFT) /* XXX */
* Macros to decode processor status word.
#define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD)
#define BASEPRI(ps) (((ps) & PSL_IPL) == 0)
#define DELAY(n) { register int N = cpuspeed * (n); while (--N > 0); }
#define DELAY(n) { register int N = (n); while (--N > 0); }