bsd/ppc/param.h

   1 /*
   2  * Copyright (c) 2000 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  * The NEXTSTEP Software License Agreement specifies the terms
  25  * and conditions for redistribution.
  26  *
  27  */
  28
  29 #ifndef _PPC_PARAM_H_
  30 #define _PPC_PARAM_H_
  31
  32 /*
  33  * Round p (pointer or byte index) up to a correctly-aligned value for all
  34  * data types (int, long, ...).   The result is u_int and must be cast to
  35  * any desired pointer type.
  36  */
  37 #define ALIGNBYTES      3
  38 #define ALIGN(p)        (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  39
  40 #define NBPG            4096            /* bytes/page */
  41 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  42 #define PGSHIFT         12              /* LOG2(NBPG) */
  43
  44 #define NBSEG           0x40000000      /* bytes/segment (quadrant) */
  45 #define SEGOFSET        (NBSEG-1)       /* byte offset into segment */
  46 #define SEGSHIFT        30              /* LOG2(NBSEG) */
  47
  48 #define DEV_BSIZE       512
  49 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  50 #define BLKDEV_IOSIZE   2048
  51 #define MAXPHYS         (128 * 1024)    /* max raw I/O transfer size */
  52
  53 #define STACK_GROWTH_UP 0               /* stack grows to lower addresses */
  54
  55 #define CLSIZE          1
  56 #define CLSIZELOG2      0
  57
  58 #define STACKSIZE 4                     /* pages in kernel stack */
  59 #define UPAGES  (USIZE+STACKSIZE)       /* total pages in u-area */
  60                                         /* red zone is beyond this */
  61
  62 /*
  63  * Constants related to network buffer management.
  64  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  65  * on machines that exchange pages of input or output buffers with mbuf
  66  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  67  * of the hardware page size.
  68  */
  69 #define MSIZE           256             /* size of an mbuf */
  70 #define MCLBYTES        2048            /* large enough for ether MTU */
  71 #define MCLSHIFT        11
  72 #define MCLOFSET        (MCLBYTES - 1)
  73 #ifndef NMBCLUSTERS
  74 #if GATEWAY
  75 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
  76 #else
  77 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)
  78                 /* cl map size was  0.5MB when MSIZE was 128, now it's 1MB*/
  79 #endif
  80 #endif
  81
  82 /* pages ("clicks") (NBPG bytes) to disk blocks */
  83 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
  84 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
  85 #define dtob(x) ((x)<<DEV_BSHIFT)
  86
  87 /* pages to bytes */
  88 #define ctob(x) ((x)<<PGSHIFT)
  89
  90 /* bytes to pages */
  91 #define btoc(x) (((unsigned)(x)+(PGOFSET))>>PGSHIFT)
  92 #ifdef __APPLE__
  93 #define  btodb(bytes, devBlockSize)         \
  94         ((unsigned)(bytes) / devBlockSize)
  95 #define  dbtob(db, devBlockSize)            \
  96              ((unsigned)(db) * devBlockSize)
  97 #else
  98 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
  99         ((unsigned)(bytes) >> DEV_BSHIFT)
 100 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 101         ((unsigned)(db) << DEV_BSHIFT)
 102 #endif
 103
 104 /*
 105  * Map a ``block device block'' to a file system block.
 106  * This should be device dependent, and should use the bsize
 107  * field from the disk label.
 108  * For now though just use DEV_BSIZE.
 109  */
 110 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 111
 112 /* from machdep/ppc/proc_reg.h */
 113 #if __BIG_ENDIAN__
 114 #define ENDIAN_MASK(val,size) (1 << (size-1 - val))
 115 #else
 116 #error code not ported to little endian targets yet
 117 #endif /* __BIG_ENDIAN__ */
 118
 119 #ifndef MASK
 120 #define MASK(PART)      ENDIAN_MASK(PART ## _BIT, 32)
 121 #endif
 122
 123 #define MSR_EE_BIT      16
 124 #define MSR_PR_BIT      17
 125 #define USERMODE(msr) (msr & MASK(MSR_PR) ? TRUE : FALSE)
 126 #define BASEPRI(msr) (msr & MASK(MSR_EE) ? TRUE : FALSE)
 127 /* end of from proc_reg.h */
 128
 129 #if     defined(KERNEL) || defined(STANDALONE)
 130 #define DELAY(n) delay(n)
 131 #else
 132 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 133 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 134
 135 #define NPIDS           16      /* maximum number of PIDs per process */
 136 #define NIOPIDS         8       /* maximum number of IO space PIDs */
 137
 138 #endif  /* _PPC_PARAM_H_ */