usr/src/sys/vax/include/param.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.
 *
 *      @(#)param.h     7.15 (Berkeley) %G%
 */

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

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

#include <machine/machlimits.h>

/*
 * Round p (pointer or byte index) up to a correctly-aligned value
 * for all data types (int, long, ...).   The result is u_int and
 * must be cast to any desired pointer type.
 */
#define ALIGN(p)        (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1))

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

#ifndef SECSIZE
#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 */
#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         (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          16              /* pages of u-area */

/*
 * Constants related to network buffer management.
 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
 * on machines that exchange pages of input or output buffers with mbuf
 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 * of the hardware page size.
 */
#define MSIZE           128             /* size of an mbuf */
#define MAPPED_MBUFS                    /* can do scatter-gather I/O */
#if CLBYTES > 1024
#define MCLBYTES        1024
#define MCLSHIFT        10
#define MCLOFSET        (MCLBYTES - 1)
#else
#define MCLBYTES        CLBYTES
#define MCLSHIFT        CLSHIFT
#define MCLOFSET        CLOFSET
#endif
#ifdef GATEWAY
#define NMBCLUSTERS     512             /* map size, max cluster allocation */
#else
#define NMBCLUSTERS     256             /* map size, max cluster allocation */
#endif

/*
 * Some macros for units conversion
 */
/* Core clicks (512 bytes) to segments and vice versa */
#define ctos(x) (x)
#define stoc(x) (x)

#ifndef SECSIZE
/* Core clicks (512 bytes) to disk blocks */
#define ctod(x) (x)
#define dtoc(x) (x)
#define dtob(x) ((x)<<PGSHIFT)
#else SECSIZE
/* Core clicks (512 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)<<9)

/* bytes to clicks */
#define btoc(x) ((((unsigned)(x)+511)>>9))

#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)

#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