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  * $FreeBSD$
   40  */
   41 
   42 #ifndef _MIPS_INCLUDE_PARAM_H_
   43 #define _MIPS_INCLUDE_PARAM_H_
   44 
   45 #include <machine/_align.h>
   46 
   47 #include <sys/cdefs.h>
   48 #ifdef _KERNEL
   49 #ifndef _LOCORE
   50 #include <machine/cpu.h>
   51 #endif
   52 #endif
   53 
   54 #define __PCI_REROUTE_INTERRUPT
   55 
   56 #ifndef MACHINE
   57 #define MACHINE         "mips"
   58 #endif
   59 #ifndef MACHINE_ARCH
   60 #if _BYTE_ORDER == _BIG_ENDIAN
   61 #ifdef __mips_n64
   62 #define MACHINE_ARCH    "mips64eb"
   63 #elif defined(__mips_n32)
   64 #define MACHINE_ARCH    "mipsn32eb"
   65 #else
   66 #define MACHINE_ARCH    "mipseb"
   67 #endif
   68 #else
   69 #ifdef __mips_n64
   70 #define MACHINE_ARCH    "mips64el"
   71 #elif defined(__mips_n32)
   72 #define MACHINE_ARCH    "mipsn32el"
   73 #else
   74 #define MACHINE_ARCH    "mipsel"
   75 #endif
   76 #endif
   77 #endif
   78 
   79 /*
   80  * OBJFORMAT_NAMES is a comma-separated list of the object formats
   81  * that are supported on the architecture.
   82  */
   83 #define OBJFORMAT_NAMES         "elf"
   84 #define OBJFORMAT_DEFAULT       "elf"
   85 
   86 #define MID_MACHINE     0       /* None but has to be defined */
   87 
   88 #ifdef SMP
   89 #define MAXSMPCPU       32
   90 #ifndef MAXCPU
   91 #define MAXCPU          MAXSMPCPU
   92 #endif
   93 #else
   94 #define MAXSMPCPU       1
   95 #define MAXCPU          1
   96 #endif
   97 
   98 /*
   99  * Round p (pointer or byte index) up to a correctly-aligned value for all
  100  * data types (int, long, ...).   The result is u_int and must be cast to
  101  * any desired pointer type.
  102  */
  103 
  104 #define ALIGNBYTES      _ALIGNBYTES
  105 #define ALIGN(p)        _ALIGN(p)
  106 /*
  107  * ALIGNED_POINTER is a boolean macro that checks whether an address
  108  * is valid to fetch data elements of type t from on this architecture.
  109  * This does not reflect the optimal alignment, just the possibility
  110  * (within reasonable limits). 
  111  */
  112 #define ALIGNED_POINTER(p, t)   ((((unsigned long)(p)) & (sizeof (t) - 1)) == 0)
  113 
  114 /*
  115  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
  116  * architecture.  It should be used with appropriate caution.
  117  */
  118 #define CACHE_LINE_SHIFT        6
  119 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
  120 
  121 #define PAGE_SHIFT              12              /* LOG2(PAGE_SIZE) */
  122 #define PAGE_SIZE               (1<<PAGE_SHIFT) /* bytes/page */
  123 #define PAGE_MASK               (PAGE_SIZE-1)
  124 
  125 #define NPTEPG                  (PAGE_SIZE/(sizeof (pt_entry_t)))
  126 #define NPDEPG                  (PAGE_SIZE/(sizeof (pd_entry_t)))
  127 
  128 #if defined(__mips_n32) || defined(__mips_n64) /*  PHYSADDR_64_BIT */
  129 #define NPTEPGSHIFT             9               /* LOG2(NPTEPG) */
  130 #else
  131 #define NPTEPGSHIFT             10               /* LOG2(NPTEPG) */
  132 #endif
  133 
  134 #ifdef __mips_n64
  135 #define NPDEPGSHIFT             9               /* LOG2(NPTEPG) */
  136 #define SEGSHIFT                (PAGE_SHIFT + NPTEPGSHIFT + NPDEPGSHIFT)
  137 #define NBSEG                   (1ul << SEGSHIFT)
  138 #define PDRSHIFT                (PAGE_SHIFT + NPTEPGSHIFT)
  139 #define PDRMASK                 ((1 << PDRSHIFT) - 1)
  140 #else
  141 #define NPDEPGSHIFT             10               /* LOG2(NPTEPG) */
  142 #define SEGSHIFT                (PAGE_SHIFT + NPTEPGSHIFT)
  143 #define NBSEG                   (1 << SEGSHIFT) /* bytes/segment */
  144 #define PDRSHIFT                SEGSHIFT        /* alias for SEG in 32 bit */
  145 #define PDRMASK                 ((1 << PDRSHIFT) - 1)
  146 #endif
  147 #define NBPDR                   (1 << PDRSHIFT) /* bytes/pagedir */
  148 #define SEGMASK                 (NBSEG - 1)     /* byte offset into segment */
  149 
  150 #define MAXPAGESIZES            1               /* max supported pagesizes */
  151 
  152 #define BLKDEV_IOSIZE           2048            /* xxx: Why is this 1/2 page? */
  153 #define MAXDUMPPGS              1               /* xxx: why is this only one? */
  154 
  155 /*
  156  * The kernel stack needs to be aligned on a (PAGE_SIZE * 2) boundary.
  157  */
  158 #define KSTACK_PAGES            2       /* kernel stack */
  159 #define KSTACK_GUARD_PAGES      2       /* pages of kstack guard; 0 disables */
  160 
  161 #define UPAGES                  2
  162 
  163 /* pages ("clicks") (4096 bytes) to disk blocks */
  164 #define ctod(x)                 ((x) << (PAGE_SHIFT - DEV_BSHIFT))
  165 #define dtoc(x)                 ((x) >> (PAGE_SHIFT - DEV_BSHIFT))
  166 
  167 /*
  168  * Map a ``block device block'' to a file system block.
  169  * This should be device dependent, and should use the bsize
  170  * field from the disk label.
  171  * For now though just use DEV_BSIZE.
  172  */
  173 #define bdbtofsb(bn)            ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
  174 
  175 /*
  176  * Mach derived conversion macros
  177  */
  178 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  179 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  180 
  181 #define atop(x)                 ((x) >> PAGE_SHIFT)
  182 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  183 
  184 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  185 
  186 #endif /* !_MIPS_INCLUDE_PARAM_H_ */

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