bsd/ppc/param.h

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /* Copyright (c) 1993,1995 NeXT Computer, Inc. All Rights Reserved */
  24
  25 #ifndef _PPC_PARAM_H_
  26 #define _PPC_PARAM_H_
  27
  28 /*
  29  * Round p (pointer or byte index) up to a correctly-aligned value for all
  30  * data types (int, long, ...).   The result is unsigned int and must be
  31  * cast to any desired pointer type.
  32  */
  33 #define ALIGNBYTES      3
  34 #define ALIGN(p)        (((unsigned int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  35
  36 #define NBPG            4096            /* bytes/page */
  37 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  38 #define PGSHIFT         12              /* LOG2(NBPG) */
  39
  40 #define NBSEG           0x40000000      /* bytes/segment (quadrant) */
  41 #define SEGOFSET        (NBSEG-1)       /* byte offset into segment */
  42 #define SEGSHIFT        30              /* LOG2(NBSEG) */
  43
  44 #define DEV_BSIZE       512
  45 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  46 #define BLKDEV_IOSIZE   2048
  47 #define MAXPHYS         (128 * 1024)    /* max raw I/O transfer size */
  48
  49 #define STACK_GROWTH_UP 0               /* stack grows to lower addresses */
  50
  51 #define CLSIZE          1
  52 #define CLSIZELOG2      0
  53
  54 #define STACKSIZE 4                     /* pages in kernel stack */
  55 #define UPAGES  0       /* total pages in u-area */
  56                                         /* red zone is beyond this */
  57
  58 /*
  59  * Constants related to network buffer management.
  60  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  61  * on machines that exchange pages of input or output buffers with mbuf
  62  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  63  * of the hardware page size.
  64  */
  65 #define MSIZE           256             /* size of an mbuf */
  66 #define MCLBYTES        2048            /* large enough for ether MTU */
  67 #define MCLSHIFT        11
  68 #define MCLOFSET        (MCLBYTES - 1)
  69 #ifndef NMBCLUSTERS
  70 #if GATEWAY
  71 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
  72 #else
  73 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)
  74                 /* cl map size was  0.5MB when MSIZE was 128, now it's 1MB*/
  75 #endif
  76 #endif
  77
  78 /* pages ("clicks") (NBPG bytes) to disk blocks */
  79 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
  80 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
  81 #define dtob(x) ((x)<<DEV_BSHIFT)
  82
  83 /* pages to bytes */
  84 #define ctob(x) ((x)<<PGSHIFT)
  85
  86 /* bytes to pages */
  87 #define btoc(x) (((unsigned)(x)+(PGOFSET))>>PGSHIFT)
  88 #ifdef __APPLE__
  89 #define  btodb(bytes, devBlockSize)         \
  90         ((unsigned)(bytes) / devBlockSize)
  91 #define  dbtob(db, devBlockSize)            \
  92              ((unsigned)(db) * devBlockSize)
  93 #else
  94 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
  95         ((unsigned)(bytes) >> DEV_BSHIFT)
  96 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
  97         ((unsigned)(db) << DEV_BSHIFT)
  98 #endif
  99
 100 /*
 101  * Map a ``block device block'' to a file system block.
 102  * This should be device dependent, and should use the bsize
 103  * field from the disk label.
 104  * For now though just use DEV_BSIZE.
 105  */
 106 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 107
 108 /* from machdep/ppc/proc_reg.h */
 109 #ifdef __BIG_ENDIAN__
 110 #define ENDIAN_MASK(val,size) (1 << (size-1 - val))
 111 #else
 112 #error code not ported to little endian targets yet
 113 #endif /* __BIG_ENDIAN__ */
 114
 115 #ifndef MASK
 116 #define MASK(PART)      ENDIAN_MASK(PART ## _BIT, 32)
 117 #endif
 118
 119 #define MSR_EE_BIT      16
 120 #define MSR_PR_BIT      17
 121 #define USERMODE(msr) (msr & MASK(MSR_PR) ? TRUE : FALSE)
 122 #define BASEPRI(msr) (msr & MASK(MSR_EE) ? TRUE : FALSE)
 123 /* end of from proc_reg.h */
 124
 125 #if     defined(KERNEL) || defined(STANDALONE)
 126 #define DELAY(n) delay(n)
 127 #else
 128 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 129 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 130
 131 #define NPIDS           16      /* maximum number of PIDs per process */
 132 #define NIOPIDS         8       /* maximum number of IO space PIDs */
 133
 134 #endif  /* _PPC_PARAM_H_ */