usr/src/sys/vax/machparam.h

/*
 * 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.
 *
 *      @(#)machparam.h 7.10 (Berkeley) 1/21/88
 */

/*
 * Machine dependent constants for VAX.
 */
#define MACHINE "vax"

#ifndef BYTE_ORDER
#include <machine/endian.h>
#endif

#define CHAR_BIT        NBBY
#define CHAR_MAX        0x7f
#define CHAR_MIN        0x80
#define CLK_TCK         60                      /* for times() */
#define INT_MAX         0x7fffffff
#define INT_MIN         0x80000000
#define LONG_MAX        0x7fffffff
#define LONG_MIN        0x80000000
#define SCHAR_MAX       0x7f
#define SCHAR_MIN       0x80
#define SHRT_MAX        0x7fff
#define SHRT_MIN        0x8000
#define UCHAR_MAX       0xff
#define UINT_MAX        0xffffffff
#define ULONG_MAX       0xffffffff
#define USHRT_MAX       0xffff

#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 KERNBASE        0x80000000      /* start of kernel virtual */
#define BTOPKERNBASE    ((u_long)KERNBASE >> PGSHIFT)

#define DEV_BSIZE       512
#define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
#define BLKDEV_IOSIZE   2048
#define MAXPHYS         (63 * 1024)     /* max raw I/O transfer size */

#define CLSIZE          2
#define CLSIZELOG2      1

#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 */
#define ctos(x) (x)
#define stoc(x) (x)

/* Core clicks (512 bytes) to disk blocks */
#define ctod(x) (x)
#define dtoc(x) (x)
#define dtob(x) ((x)<<PGSHIFT)

/* clicks to bytes */
#define ctob(x) ((x)<<9)

/* bytes to clicks */
#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))

/*
 * Macros to decode processor status word.
 */
#define USERMODE(ps)    (((ps) & PSL_CURMOD) == PSL_CURMOD)
#define BASEPRI(ps)     (((ps) & PSL_IPL) == 0)

#ifdef KERNEL
#ifndef LOCORE
int     cpuspeed;
#define DELAY(n)        { register int N = cpuspeed * (n); while (--N > 0); }
#endif

#else KERNEL
#define DELAY(n)        { register int N = (n); while (--N > 0); }
#endif KERNEL