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/amd64/include/param.h

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    1 /*-
    2  * Copyright (c) 2002 David E. O'Brien.  All rights reserved.
    3  * Copyright (c) 1992, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * the Systems Programming Group of the University of Utah Computer
    8  * Science Department and Ralph Campbell.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)param.h     8.1 (Berkeley) 6/10/93
   39  * $FreeBSD: releng/9.0/sys/amd64/include/param.h 224217 2011-07-19 13:00:30Z attilio $
   40  */
   41 
   42 
   43 #ifndef _AMD64_INCLUDE_PARAM_H_
   44 #define _AMD64_INCLUDE_PARAM_H_
   45 
   46 #include <machine/_align.h>
   47 
   48 /*
   49  * Machine dependent constants for AMD64.
   50  */
   51 
   52 
   53 #define __HAVE_ACPI
   54 #define __PCI_REROUTE_INTERRUPT
   55 
   56 #ifndef MACHINE
   57 #define MACHINE         "amd64"
   58 #endif
   59 #ifndef MACHINE_ARCH
   60 #define MACHINE_ARCH    "amd64"
   61 #endif
   62 #ifndef MACHINE_ARCH32
   63 #define MACHINE_ARCH32  "i386"
   64 #endif
   65 
   66 #if defined(SMP) || defined(KLD_MODULE)
   67 #ifndef MAXCPU
   68 #define MAXCPU          64
   69 #endif
   70 #else
   71 #define MAXCPU          1
   72 #endif
   73 
   74 #define ALIGNBYTES              _ALIGNBYTES
   75 #define ALIGN(p)                _ALIGN(p)
   76 /*
   77  * ALIGNED_POINTER is a boolean macro that checks whether an address
   78  * is valid to fetch data elements of type t from on this architecture.
   79  * This does not reflect the optimal alignment, just the possibility
   80  * (within reasonable limits). 
   81  */
   82 #define ALIGNED_POINTER(p, t)   1
   83 
   84 /*
   85  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
   86  * architecture.  It should be used with appropriate caution.
   87  */
   88 #define CACHE_LINE_SHIFT        7
   89 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
   90 
   91 /* Size of the level 1 page table units */
   92 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   93 #define NPTEPGSHIFT     9               /* LOG2(NPTEPG) */
   94 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   95 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   96 #define PAGE_MASK       (PAGE_SIZE-1)
   97 /* Size of the level 2 page directory units */
   98 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
   99 #define NPDEPGSHIFT     9               /* LOG2(NPDEPG) */
  100 #define PDRSHIFT        21              /* LOG2(NBPDR) */
  101 #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
  102 #define PDRMASK         (NBPDR-1)
  103 /* Size of the level 3 page directory pointer table units */
  104 #define NPDPEPG         (PAGE_SIZE/(sizeof (pdp_entry_t)))
  105 #define NPDPEPGSHIFT    9               /* LOG2(NPDPEPG) */
  106 #define PDPSHIFT        30              /* LOG2(NBPDP) */
  107 #define NBPDP           (1<<PDPSHIFT)   /* bytes/page dir ptr table */
  108 #define PDPMASK         (NBPDP-1)
  109 /* Size of the level 4 page-map level-4 table units */
  110 #define NPML4EPG        (PAGE_SIZE/(sizeof (pml4_entry_t)))
  111 #define NPML4EPGSHIFT   9               /* LOG2(NPML4EPG) */
  112 #define PML4SHIFT       39              /* LOG2(NBPML4) */
  113 #define NBPML4          (1UL<<PML4SHIFT)/* bytes/page map lev4 table */
  114 #define PML4MASK        (NBPML4-1)
  115 
  116 #define MAXPAGESIZES    3       /* maximum number of supported page sizes */
  117 
  118 #define IOPAGES 2               /* pages of i/o permission bitmap */
  119 
  120 #ifndef KSTACK_PAGES
  121 #define KSTACK_PAGES    4       /* pages of kstack (with pcb) */
  122 #endif
  123 #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
  124 
  125 /*
  126  * Ceiling on amount of swblock kva space, can be changed via
  127  * the kern.maxswzone /boot/loader.conf variable.
  128  */
  129 #ifndef VM_SWZONE_SIZE_MAX
  130 #define VM_SWZONE_SIZE_MAX      (32 * 1024 * 1024)
  131 #endif
  132 
  133 /*
  134  * Mach derived conversion macros
  135  */
  136 #define round_page(x)   ((((unsigned long)(x)) + PAGE_MASK) & ~(PAGE_MASK))
  137 #define trunc_page(x)   ((unsigned long)(x) & ~(PAGE_MASK))
  138 #define trunc_2mpage(x) ((unsigned long)(x) & ~PDRMASK)
  139 #define round_2mpage(x) ((((unsigned long)(x)) + PDRMASK) & ~PDRMASK)
  140 #define trunc_1gpage(x) ((unsigned long)(x) & ~PDPMASK)
  141 
  142 #define atop(x)         ((unsigned long)(x) >> PAGE_SHIFT)
  143 #define ptoa(x)         ((unsigned long)(x) << PAGE_SHIFT)
  144 
  145 #define amd64_btop(x)   ((unsigned long)(x) >> PAGE_SHIFT)
  146 #define amd64_ptob(x)   ((unsigned long)(x) << PAGE_SHIFT)
  147 
  148 #define pgtok(x)        ((unsigned long)(x) * (PAGE_SIZE / 1024)) 
  149 
  150 #endif /* !_AMD64_INCLUDE_PARAM_H_ */

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