bsd/ppc/param.h

   1 /*
   2  * Copyright (c) 2000-2004, 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright (c) 1993,1995 NeXT Computer, Inc. All Rights Reserved */
  29
  30 #ifndef _PPC_PARAM_H_
  31 #define _PPC_PARAM_H_
  32
  33 /*
  34  * Round p (pointer or byte index) up to a correctly-aligned value for all
  35  * data types (int, long, ...).   The result is unsigned long and must be
  36  * cast to any desired pointer type.
  37  */
  38 #define ALIGNBYTES      (sizeof(unsigned long) - 1)
  39 #define ALIGN(p)        ((unsigned long)((char *)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  40
  41 #define NBPG            4096            /* bytes/page */
  42 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  43 #define PGSHIFT         12              /* LOG2(NBPG) */
  44
  45 #define NBSEG           0x40000000      /* bytes/segment (quadrant) */
  46 #define SEGOFSET        (NBSEG-1)       /* byte offset into segment */
  47 #define SEGSHIFT        30              /* LOG2(NBSEG) */
  48
  49 #define DEV_BSIZE       512
  50 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  51 #define BLKDEV_IOSIZE   2048
  52 #define MAXPHYS         (128 * 1024)    /* max raw I/O transfer size */
  53
  54 #define STACK_GROWTH_UP 0               /* stack grows to lower addresses */
  55
  56 #define CLSIZE          1
  57 #define CLSIZELOG2      0
  58
  59 #define STACKSIZE 4                     /* pages in kernel stack */
  60 #define UPAGES  0       /* total pages in u-area */
  61                                         /* red zone is beyond this */
  62
  63 /*
  64  * Constants related to network buffer management.
  65  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  66  * on machines that exchange pages of input or output buffers with mbuf
  67  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  68  * of the hardware page size.
  69  */
  70 #define MSIZE           256             /* size of an mbuf */
  71 #define MCLBYTES        2048            /* large enough for ether MTU */
  72 #define MCLSHIFT        11
  73 #define MCLOFSET        (MCLBYTES - 1)
  74 #ifndef NMBCLUSTERS
  75 #if GATEWAY
  76 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
  77 #else
  78 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)
  79                 /* cl map size was  0.5MB when MSIZE was 128, now it's 1MB*/
  80 #endif
  81 #endif
  82
  83 /* pages ("clicks") (NBPG bytes) to disk blocks */
  84 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
  85 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
  86 #define dtob(x) ((x)<<DEV_BSHIFT)
  87
  88 /* pages to bytes */
  89 #define ctob(x) ((x)<<PGSHIFT)
  90
  91 /* bytes to pages */
  92 #define btoc(x) (((unsigned)(x)+(PGOFSET))>>PGSHIFT)
  93 #ifdef __APPLE__
  94 #define  btodb(bytes, devBlockSize)         \
  95         ((unsigned)(bytes) / devBlockSize)
  96 #define  dbtob(db, devBlockSize)            \
  97              ((unsigned)(db) * devBlockSize)
  98 #else
  99 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 100         ((unsigned)(bytes) >> DEV_BSHIFT)
 101 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 102         ((unsigned)(db) << DEV_BSHIFT)
 103 #endif
 104
 105 /*
 106  * Map a ``block device block'' to a file system block.
 107  * This should be device dependent, and should use the bsize
 108  * field from the disk label.
 109  * For now though just use DEV_BSIZE.
 110  */
 111 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 112
 113 /* from machdep/ppc/proc_reg.h */
 114 #ifdef __BIG_ENDIAN__
 115 #define ENDIAN_MASK(val,size) (1 << (size-1 - val))
 116 #else
 117 #error code not ported to little endian targets yet
 118 #endif /* __BIG_ENDIAN__ */
 119
 120 #ifndef MASK
 121 #define MASK(PART)      ENDIAN_MASK(PART ## _BIT, 32)
 122 #endif
 123
 124 #define MSR_EE_BIT      16
 125 #define MSR_PR_BIT      17
 126 #define USERMODE(msr) (msr & MASK(MSR_PR) ? TRUE : FALSE)
 127 #define BASEPRI(msr) (msr & MASK(MSR_EE) ? TRUE : FALSE)
 128 /* end of from proc_reg.h */
 129
 130 #if     defined(KERNEL) || defined(STANDALONE)
 131 #define DELAY(n) delay(n)
 132 #else
 133 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 134 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 135
 136 #define NPIDS           16      /* maximum number of PIDs per process */
 137 #define NIOPIDS         8       /* maximum number of IO space PIDs */
 138
 139 #endif  /* _PPC_PARAM_H_ */