bsd/arm/param.h

   1 /*
   2  * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
   3  */
   4 /*-
   5  * Copyright (c) 1990, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  * (c) UNIX System Laboratories, Inc.
   8  * All or some portions of this file are derived from material licensed
   9  * to the University of California by American Telephone and Telegraph
  10  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  11  * the permission of UNIX System Laboratories, Inc.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *      @(#)param.h     8.1 (Berkeley) 4/4/95
  42  */
  43
  44 /*
  45  * Machine dependent constants for ARM
  46  */
  47
  48 #ifndef _ARM_PARAM_H_
  49 #define _ARM_PARAM_H_
  50
  51 #include <arm/_param.h>
  52
  53 /*
  54  * Round p (pointer or byte index) up to a correctly-aligned value for all
  55  * data types (int, long, ...).   The result is unsigned int and must be
  56  * cast to any desired pointer type.
  57  */
  58 #define ALIGNBYTES      __DARWIN_ALIGNBYTES
  59 #define ALIGN(p)        __DARWIN_ALIGN(p)
  60
  61 #define NBPG            4096            /* bytes/page */
  62 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  63 #define PGSHIFT         12              /* LOG2(NBPG) */
  64
  65 #define DEV_BSIZE       512
  66 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  67 #define BLKDEV_IOSIZE   2048
  68 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  69
  70 #define CLSIZE          1
  71 #define CLSIZELOG2      0
  72
  73 /*
  74  * Constants related to network buffer management.
  75  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  76  * on machines that exchange pages of input or output buffers with mbuf
  77  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  78  * of the hardware page size.
  79  */
  80 #define MSIZESHIFT      8                       /* 256 */
  81 #define MSIZE           (1 << MSIZESHIFT)       /* size of an mbuf */
  82 #define MCLSHIFT        11                      /* 2048 */
  83 #define MCLBYTES        (1 << MCLSHIFT)         /* size of an mbuf cluster */
  84 #define MBIGCLSHIFT     12                      /* 4096 */
  85 #define MBIGCLBYTES     (1 << MBIGCLSHIFT)      /* size of a big cluster */
  86 #define M16KCLSHIFT     14                      /* 16384 */
  87 #define M16KCLBYTES     (1 << M16KCLSHIFT)      /* size of a jumbo cluster */
  88
  89 #define MCLOFSET        (MCLBYTES - 1)
  90 #ifndef NMBCLUSTERS
  91 #define NMBCLUSTERS     CONFIG_NMBCLUSTERS      /* cl map size */
  92 #endif
  93
  94 /*
  95  * Some macros for units conversion
  96  */
  97 /* Core clicks (NeXT_page_size bytes) to segments and vice versa */
  98 #define ctos(x) (x)
  99 #define stoc(x) (x)
 100
 101 /* Core clicks (4096 bytes) to disk blocks */
 102 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
 103 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
 104 #define dtob(x) ((x)<<DEV_BSHIFT)
 105
 106 /* clicks to bytes */
 107 #define ctob(x) ((x)<<PGSHIFT)
 108
 109 /* bytes to clicks */
 110 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
 111
 112 #ifdef __APPLE__
 113 #define  btodb(bytes, devBlockSize)         \
 114         ((unsigned)(bytes) / devBlockSize)
 115 #define  dbtob(db, devBlockSize)            \
 116         ((unsigned)(db) * devBlockSize)
 117 #else
 118 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 119         ((unsigned)(bytes) >> DEV_BSHIFT)
 120 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 121         ((unsigned)(db) << DEV_BSHIFT)
 122 #endif
 123
 124 /*
 125  * Map a ``block device block'' to a file system block.
 126  * This should be device dependent, and will be if we
 127  * add an entry to cdevsw/bdevsw for that purpose.
 128  * For now though just use DEV_BSIZE.
 129  */
 130 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 131
 132 /*
 133  * Macros to decode (and encode) processor status word.
 134  */
 135 #define STATUS_WORD(rpl, ipl)   (((ipl) << 8) | (rpl))
 136 #define USERMODE(x)             (((x) & 3) == 3)
 137 #define BASEPRI(x)              (((x) & (255 << 8)) == 0)
 138
 139
 140 #if     defined(KERNEL) || defined(STANDALONE)
 141 #define DELAY(n) delay(n)
 142
 143 #else   /* defined(KERNEL) || defined(STANDALONE) */
 144 #define DELAY(n)        { int N = (n); while (--N > 0); }
 145 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 146
 147 #endif /* _ARM_PARAM_H_ */