usr/src/sys/tahoe/include/param.h

/*
 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)param.h     7.1 (Berkeley) %G%
 */

/*
 * Machine dependent constants for TAHOE.
 */
#define MACHINE "tahoe"

#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            1024            /* bytes/page */
#define PGOFSET         (NBPG-1)        /* byte offset into page */
#define PGSHIFT         10              /* LOG2(NBPG) */
#define NPTEPG          (NBPG/(sizeof (struct pte)))

#define KERNBASE        0xc0000000      /* start of kernel virtual */
#define BTOPKERNBASE    ((u_long)KERNBASE >> PGSHIFT)

#define KERNBASE        0xc0000000      /* start of kernel virtual */
#define BTOPKERNBASE    ((u_long)KERNBASE >> PGSHIFT)

#ifndef SECSIZE
#define DEV_BSIZE       1024
#define DEV_BSHIFT      10              /* log2(DEV_BSIZE) */
#define BLKDEV_IOSIZE   1024            /* NBPG for physical controllers */
#define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
#else SECSIZE
/*
 * 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_BSIZE       NBPG
#define DEV_BSHIFT      PGSHIFT         /* log2(DEV_BSIZE) */
#define BLKDEV_IOSIZE   NBPG            /* NBPG for unlabeled block devices */
#endif SECSIZE
#define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */

#define CLSIZE          1
#define CLSIZELOG2      0

#define SSIZE           2               /* initial stack size/NBPG */
#define SINCR           2               /* increment of stack/NBPG */
#define UPAGES          6               /* pages of u-area (2 stack pages) */

#define MAXCKEY 255             /* maximal allowed code key */
#define MAXDKEY 255             /* maximal allowed data key */
#define NCKEY   (MAXCKEY+1)     /* # code keys, including 0 (reserved) */
#define NDKEY   (MAXDKEY+1)     /* # data keys, including 0 (reserved) */

/*
 * Some macros for units conversion
 */
/* Core clicks (1024 bytes) to segments and vice versa */
#define ctos(x) (x)
#define stoc(x) (x)

#ifndef SECSIZE
/* Core clicks (1024 bytes) to disk blocks */
#define ctod(x) (x)
#define dtoc(x) (x)
#define dtob(x) ((x)<<PGSHIFT)
#else SECSIZE
/* Core clicks (1024 bytes) to disk blocks; deprecated */
#define ctod(x) (x)                             /* XXX */
#define dtoc(x) (x)                             /* XXX */
#define dtob(x) ((x)<<PGSHIFT)                  /* XXX */
#endif SECSIZE

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

/* bytes to clicks */
#define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT))

#ifndef SECSIZE
#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))
#else SECSIZE
/* bytes to "disk blocks" and back; deprecated */
#define btodb(bytes)    ((unsigned)(bytes) >> DEV_BSHIFT)       /* XXX */
#define dbtob(db)       ((unsigned)(db) << DEV_BSHIFT)          /* XXX */
#endif SECSIZE

/*
 * 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 = 3*(n); while (--N > 0); }