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

/*
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Lawrence Berkeley Laboratory.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)param.h     7.4 (Berkeley) %G%
 *
 * from: $Header: param.h,v 1.14 93/04/07 01:34:00 torek Exp $ (LBL)
 */

/*
 * Machine dependent constants for Sun-4c (SPARCstation)
 */
#define MACHINE "sparc"

#ifdef KERNEL                           /* XXX */
#include <machine/cpu.h>                /* XXX */
#endif                                  /* XXX */

/*
 * Round p (pointer or byte index) up to a correctly-aligned value for
 * the machine's strictest data type.  The result is u_int and must be
 * cast to any desired pointer type.
 */
#define ALIGNBYTES      7
#define ALIGN(p)        (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)

#define NBPG            4096            /* bytes/page */
#define PGOFSET         (NBPG-1)        /* byte offset into page */
#define PGSHIFT         12              /* log2(NBPG) */

#define KERNBASE        0xf8000000      /* start of kernel virtual space */
#define KERNTEXTOFF     0xf8004000      /* start of kernel text */
#define BTOPKERNBASE    ((u_long)KERNBASE >> PG_SHIFT)

#define DEV_BSIZE       512
#define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
#define BLKDEV_IOSIZE   2048
#define MAXPHYS         (64 * 1024)

#define CLSIZE          1
#define CLSIZELOG2      0

/* NOTE: SSIZE and UPAGES must be multiples of CLSIZE */
#define SSIZE           1               /* initial stack size/NBPG */
#define UPAGES          2               /* 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 MCLBYTES        2048            /* enough for whole Ethernet packet */
#define MCLSHIFT        11              /* log2(MCLBYTES) */
#define MCLOFSET        (MCLBYTES - 1)

#ifndef NMBCLUSTERS
#ifdef GATEWAY
#define NMBCLUSTERS     512             /* map size, max cluster allocation */
#else
#define NMBCLUSTERS     256             /* map size, max cluster allocation */
#endif
#endif

/*
 * Size of kernel malloc arena in CLBYTES-sized logical pages.
 */
#ifndef NKMEMCLUSTERS
#define NKMEMCLUSTERS   (6 * 1024 * 1024 / CLBYTES)
#endif

/* pages ("clicks") (4096 bytes) to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
#define dtob(x) ((x) << DEV_BSHIFT)

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

/* bytes to pages */
#define btoc(x) (((unsigned)(x) + PGOFSET) >> PGSHIFT)

#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 should use the bsize
 * field from the disk label.
 * For now though just use DEV_BSIZE.
 */
#define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))

#ifdef KERNEL
#ifndef LOCORE
int cpuspeed;           /* XXX for sysctl(hw.cpuspeed) only; should remove */
#define DELAY(n)        delay(n)
#endif
#else
#define DELAY(n)        { register volatile int N = (n); while (--N > 0); }
#endif