The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/include/param.h

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    1 /*      $OpenBSD: param.h,v 1.11 1998/08/30 22:05:35 millert Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1988 University of Utah.
    5  * Copyright (c) 1992, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * the Systems Programming Group of the University of Utah Computer
   10  * Science Department and Ralph Campbell.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: Utah Hdr: machparam.h 1.11 89/08/14
   37  *      from: @(#)param.h       8.1 (Berkeley) 6/10/93
   38  *      JNPR: param.h,v 1.6.2.1 2007/09/10 07:49:36 girish
   39  * $FreeBSD: releng/8.4/sys/mips/include/param.h 228296 2011-12-06 00:13:40Z gonzo $
   40  */
   41 
   42 #ifndef _MACHINE_PARAM_H_
   43 #define _MACHINE_PARAM_H_
   44 
   45 #include <sys/cdefs.h>
   46 #ifdef _KERNEL
   47 #ifndef _LOCORE
   48 #include <machine/cpu.h>
   49 #endif
   50 #endif
   51 
   52 #define __PCI_REROUTE_INTERRUPT
   53 
   54 #ifndef MACHINE
   55 #define MACHINE         "mips"
   56 #endif
   57 #ifndef MACHINE_ARCH
   58 #define MACHINE_ARCH    "mips"
   59 #endif
   60 
   61 /*
   62  * OBJFORMAT_NAMES is a comma-separated list of the object formats
   63  * that are supported on the architecture.
   64  */
   65 #define OBJFORMAT_NAMES         "elf"
   66 #define OBJFORMAT_DEFAULT       "elf"
   67 
   68 #define MID_MACHINE     0       /* None but has to be defined */
   69 
   70 #ifdef SMP
   71 #define MAXSMPCPU       32
   72 #define MAXCPU          MAXSMPCPU
   73 #else
   74 #define MAXSMPCPU       1
   75 #define MAXCPU          1
   76 #endif
   77 
   78 /*
   79  * Round p (pointer or byte index) up to a correctly-aligned value for all
   80  * data types (int, long, ...).   The result is u_long and must be cast to
   81  * any desired pointer type.
   82  */
   83 #define _ALIGNBYTES     7
   84 #define _ALIGN(p)       (((u_long)(p) + _ALIGNBYTES) &~ _ALIGNBYTES)
   85 
   86 #define ALIGNBYTES      _ALIGNBYTES
   87 #define ALIGN(p)        _ALIGN(p)
   88 /*
   89  * ALIGNED_POINTER is a boolean macro that checks whether an address
   90  * is valid to fetch data elements of type t from on this architecture.
   91  * This does not reflect the optimal alignment, just the possibility
   92  * (within reasonable limits). 
   93  */
   94 #define ALIGNED_POINTER(p, t)   ((((unsigned long)(p)) & (sizeof (t) - 1)) == 0)
   95 
   96 /*
   97  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
   98  * architecture.  It should be used with appropriate caution.
   99  */
  100 #define CACHE_LINE_SHIFT        6
  101 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
  102 
  103 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
  104 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
  105 #define PAGE_MASK       (PAGE_SIZE-1)
  106 
  107 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
  108 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
  109 
  110 #if defined(__mips_n64)
  111 #define SEGSHIFT        31              /* LOG2(NBSEG) */
  112 #define NBSEG           (1ul << SEGSHIFT)       /* bytes/segment */
  113 #define PDRSHIFT        22              /* second level */
  114 #define PDRMASK         ((1 << PDRSHIFT) - 1)
  115 #else
  116 #define SEGSHIFT        22              /* LOG2(NBSEG) */
  117 #define NBSEG           (1 << SEGSHIFT) /* bytes/segment */
  118 #define PDRSHIFT        SEGSHIFT        /* alias for SEG in 32 bit */
  119 #define PDRMASK         ((1 << PDRSHIFT) - 1)
  120 #endif
  121 #define NBPDR           (1 << PDRSHIFT) /* bytes/pagedir */
  122 #define SEGMASK         (NBSEG-1)       /* byte offset into segment */
  123 
  124 #define MAXPAGESIZES    1               /* maximum number of supported page sizes */
  125 
  126 #define BLKDEV_IOSIZE   2048            /* xxx: Why is this 1/2 page? */
  127 #define MAXDUMPPGS      1               /* xxx: why is this only one? */
  128 
  129 /*
  130  * The kernel stack needs to be aligned on a (PAGE_SIZE * 2) boundary.
  131  */
  132 #define KSTACK_PAGES            2       /* kernel stack */
  133 #define KSTACK_GUARD_PAGES      2       /* pages of kstack guard; 0 disables */
  134 
  135 #define UPAGES                  2
  136 
  137 /* pages ("clicks") (4096 bytes) to disk blocks */
  138 #define ctod(x)         ((x) << (PAGE_SHIFT - DEV_BSHIFT))
  139 #define dtoc(x)         ((x) >> (PAGE_SHIFT - DEV_BSHIFT))
  140 
  141 /*
  142  * Map a ``block device block'' to a file system block.
  143  * This should be device dependent, and should use the bsize
  144  * field from the disk label.
  145  * For now though just use DEV_BSIZE.
  146  */
  147 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
  148 
  149 /*
  150  * Mach derived conversion macros
  151  */
  152 #define round_page(x)           (((unsigned long)(x) + PAGE_MASK) & ~PAGE_MASK)
  153 #define trunc_page(x)           ((unsigned long)(x) & ~PAGE_MASK)
  154 
  155 #define atop(x)                 ((unsigned long)(x) >> PAGE_SHIFT)
  156 #define ptoa(x)                 ((unsigned long)(x) << PAGE_SHIFT)
  157 
  158 #define mips_btop(x)            ((unsigned long)(x) >> PAGE_SHIFT)
  159 #define mips_ptob(x)            ((unsigned long)(x) << PAGE_SHIFT)
  160 
  161 #define pgtok(x)                ((unsigned long)(x) * (PAGE_SIZE / 1024))
  162 
  163 #ifndef _KERNEL
  164 #define DELAY(n)        { register int N = (n); while (--N > 0); }
  165 #endif /* !_KERNEL */
  166 
  167 #endif /* !_MACHINE_PARAM_H_ */

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