bsd/ppc/param.h

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1993,1995 NeXT Computer, Inc. All Rights Reserved */
  23
  24 #ifndef _PPC_PARAM_H_
  25 #define _PPC_PARAM_H_
  26
  27 /*
  28  * Round p (pointer or byte index) up to a correctly-aligned value for all
  29  * data types (int, long, ...).   The result is unsigned int and must be
  30  * cast to any desired pointer type.
  31  */
  32 #define ALIGNBYTES      3
  33 #define ALIGN(p)        (((unsigned int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  34
  35 #define NBPG            4096            /* bytes/page */
  36 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  37 #define PGSHIFT         12              /* LOG2(NBPG) */
  38
  39 #define NBSEG           0x40000000      /* bytes/segment (quadrant) */
  40 #define SEGOFSET        (NBSEG-1)       /* byte offset into segment */
  41 #define SEGSHIFT        30              /* LOG2(NBSEG) */
  42
  43 #define DEV_BSIZE       512
  44 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  45 #define BLKDEV_IOSIZE   2048
  46 #define MAXPHYS         (128 * 1024)    /* max raw I/O transfer size */
  47
  48 #define STACK_GROWTH_UP 0               /* stack grows to lower addresses */
  49
  50 #define CLSIZE          1
  51 #define CLSIZELOG2      0
  52
  53 #define STACKSIZE 4                     /* pages in kernel stack */
  54 #define UPAGES  0       /* total pages in u-area */
  55                                         /* red zone is beyond this */
  56
  57 /*
  58  * Constants related to network buffer management.
  59  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  60  * on machines that exchange pages of input or output buffers with mbuf
  61  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  62  * of the hardware page size.
  63  */
  64 #define MSIZE           256             /* size of an mbuf */
  65 #define MCLBYTES        2048            /* large enough for ether MTU */
  66 #define MCLSHIFT        11
  67 #define MCLOFSET        (MCLBYTES - 1)
  68 #ifndef NMBCLUSTERS
  69 #if GATEWAY
  70 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
  71 #else
  72 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)
  73                 /* cl map size was  0.5MB when MSIZE was 128, now it's 1MB*/
  74 #endif
  75 #endif
  76
  77 /* pages ("clicks") (NBPG bytes) to disk blocks */
  78 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
  79 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
  80 #define dtob(x) ((x)<<DEV_BSHIFT)
  81
  82 /* pages to bytes */
  83 #define ctob(x) ((x)<<PGSHIFT)
  84
  85 /* bytes to pages */
  86 #define btoc(x) (((unsigned)(x)+(PGOFSET))>>PGSHIFT)
  87 #ifdef __APPLE__
  88 #define  btodb(bytes, devBlockSize)         \
  89         ((unsigned)(bytes) / devBlockSize)
  90 #define  dbtob(db, devBlockSize)            \
  91              ((unsigned)(db) * devBlockSize)
  92 #else
  93 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
  94         ((unsigned)(bytes) >> DEV_BSHIFT)
  95 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
  96         ((unsigned)(db) << DEV_BSHIFT)
  97 #endif
  98
  99 /*
 100  * Map a ``block device block'' to a file system block.
 101  * This should be device dependent, and should use the bsize
 102  * field from the disk label.
 103  * For now though just use DEV_BSIZE.
 104  */
 105 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 106
 107 /* from machdep/ppc/proc_reg.h */
 108 #ifdef __BIG_ENDIAN__
 109 #define ENDIAN_MASK(val,size) (1 << (size-1 - val))
 110 #else
 111 #error code not ported to little endian targets yet
 112 #endif /* __BIG_ENDIAN__ */
 113
 114 #ifndef MASK
 115 #define MASK(PART)      ENDIAN_MASK(PART ## _BIT, 32)
 116 #endif
 117
 118 #define MSR_EE_BIT      16
 119 #define MSR_PR_BIT      17
 120 #define USERMODE(msr) (msr & MASK(MSR_PR) ? TRUE : FALSE)
 121 #define BASEPRI(msr) (msr & MASK(MSR_EE) ? TRUE : FALSE)
 122 /* end of from proc_reg.h */
 123
 124 #if     defined(KERNEL) || defined(STANDALONE)
 125 #define DELAY(n) delay(n)
 126 #else
 127 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 128 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 129
 130 #define NPIDS           16      /* maximum number of PIDs per process */
 131 #define NIOPIDS         8       /* maximum number of IO space PIDs */
 132
 133 #endif  /* _PPC_PARAM_H_ */