bsd/ppc/param.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /* Copyright (c) 1993,1995 NeXT Computer, Inc. All Rights Reserved */
  26 /*
  27  * The NEXTSTEP Software License Agreement specifies the terms
  28  * and conditions for redistribution.
  29  *
  30  */
  31
  32 #ifndef _PPC_PARAM_H_
  33 #define _PPC_PARAM_H_
  34
  35 /*
  36  * Round p (pointer or byte index) up to a correctly-aligned value for all
  37  * data types (int, long, ...).   The result is u_int and must be cast to
  38  * any desired pointer type.
  39  */
  40 #define ALIGNBYTES      3
  41 #define ALIGN(p)        (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  42
  43 #define NBPG            4096            /* bytes/page */
  44 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  45 #define PGSHIFT         12              /* LOG2(NBPG) */
  46
  47 #define NBSEG           0x40000000      /* bytes/segment (quadrant) */
  48 #define SEGOFSET        (NBSEG-1)       /* byte offset into segment */
  49 #define SEGSHIFT        30              /* LOG2(NBSEG) */
  50
  51 #define DEV_BSIZE       512
  52 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  53 #define BLKDEV_IOSIZE   2048
  54 #define MAXPHYS         (128 * 1024)    /* max raw I/O transfer size */
  55
  56 #define STACK_GROWTH_UP 0               /* stack grows to lower addresses */
  57
  58 #define CLSIZE          1
  59 #define CLSIZELOG2      0
  60
  61 #define STACKSIZE 4                     /* pages in kernel stack */
  62 #define UPAGES  0       /* total pages in u-area */
  63                                         /* red zone is beyond this */
  64
  65 /*
  66  * Constants related to network buffer management.
  67  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  68  * on machines that exchange pages of input or output buffers with mbuf
  69  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  70  * of the hardware page size.
  71  */
  72 #define MSIZE           256             /* size of an mbuf */
  73 #define MCLBYTES        2048            /* large enough for ether MTU */
  74 #define MCLSHIFT        11
  75 #define MCLOFSET        (MCLBYTES - 1)
  76 #ifndef NMBCLUSTERS
  77 #if GATEWAY
  78 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
  79 #else
  80 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)
  81                 /* cl map size was  0.5MB when MSIZE was 128, now it's 1MB*/
  82 #endif
  83 #endif
  84
  85 /* pages ("clicks") (NBPG bytes) to disk blocks */
  86 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
  87 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
  88 #define dtob(x) ((x)<<DEV_BSHIFT)
  89
  90 /* pages to bytes */
  91 #define ctob(x) ((x)<<PGSHIFT)
  92
  93 /* bytes to pages */
  94 #define btoc(x) (((unsigned)(x)+(PGOFSET))>>PGSHIFT)
  95 #ifdef __APPLE__
  96 #define  btodb(bytes, devBlockSize)         \
  97         ((unsigned)(bytes) / devBlockSize)
  98 #define  dbtob(db, devBlockSize)            \
  99              ((unsigned)(db) * devBlockSize)
 100 #else
 101 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 102         ((unsigned)(bytes) >> DEV_BSHIFT)
 103 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 104         ((unsigned)(db) << DEV_BSHIFT)
 105 #endif
 106
 107 /*
 108  * Map a ``block device block'' to a file system block.
 109  * This should be device dependent, and should use the bsize
 110  * field from the disk label.
 111  * For now though just use DEV_BSIZE.
 112  */
 113 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 114
 115 /* from machdep/ppc/proc_reg.h */
 116 #ifdef __BIG_ENDIAN__
 117 #define ENDIAN_MASK(val,size) (1 << (size-1 - val))
 118 #else
 119 #error code not ported to little endian targets yet
 120 #endif /* __BIG_ENDIAN__ */
 121
 122 #ifndef MASK
 123 #define MASK(PART)      ENDIAN_MASK(PART ## _BIT, 32)
 124 #endif
 125
 126 #define MSR_EE_BIT      16
 127 #define MSR_PR_BIT      17
 128 #define USERMODE(msr) (msr & MASK(MSR_PR) ? TRUE : FALSE)
 129 #define BASEPRI(msr) (msr & MASK(MSR_EE) ? TRUE : FALSE)
 130 /* end of from proc_reg.h */
 131
 132 #if     defined(KERNEL) || defined(STANDALONE)
 133 #define DELAY(n) delay(n)
 134 #else
 135 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 136 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 137
 138 #define NPIDS           16      /* maximum number of PIDs per process */
 139 #define NIOPIDS         8       /* maximum number of IO space PIDs */
 140
 141 #endif  /* _PPC_PARAM_H_ */