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/i386/include/param.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990 The Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * William Jolitz.
    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. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)param.h       5.8 (Berkeley) 6/28/91
   35  * $FreeBSD$
   36  */
   37 
   38 #ifndef _I386_INCLUDE_PARAM_H_
   39 #define _I386_INCLUDE_PARAM_H_
   40 
   41 #include <machine/_align.h>
   42 
   43 /*
   44  * Machine dependent constants for Intel 386.
   45  */
   46 
   47 #define __HAVE_ACPI
   48 #define __HAVE_PIR
   49 #define __PCI_REROUTE_INTERRUPT
   50 
   51 #ifndef MACHINE
   52 #define MACHINE         "i386"
   53 #endif
   54 #ifndef MACHINE_ARCH
   55 #define MACHINE_ARCH    "i386"
   56 #endif
   57 #define MID_MACHINE     MID_I386
   58 
   59 #ifdef SMP
   60 #ifndef MAXCPU
   61 #define MAXCPU          32
   62 #endif
   63 #else
   64 #define MAXCPU          1
   65 #endif
   66 
   67 #ifndef MAXMEMDOM
   68 #define MAXMEMDOM       1
   69 #endif
   70 
   71 #define ALIGNBYTES      _ALIGNBYTES
   72 #define ALIGN(p)        _ALIGN(p)
   73 /*
   74  * ALIGNED_POINTER is a boolean macro that checks whether an address
   75  * is valid to fetch data elements of type t from on this architecture.
   76  * This does not reflect the optimal alignment, just the possibility
   77  * (within reasonable limits). 
   78  */
   79 #define ALIGNED_POINTER(p, t)   1
   80 
   81 /*
   82  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
   83  * architecture.  It should be used with appropriate caution.
   84  */
   85 #define CACHE_LINE_SHIFT        6
   86 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
   87 
   88 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   89 #define PAGE_SIZE       (1 << PAGE_SHIFT)       /* bytes/page */
   90 #define PAGE_MASK       (PAGE_SIZE - 1)
   91 #define NPTEPG          (PAGE_SIZE / sizeof(pt_entry_t))
   92 
   93 /* Size in bytes of the page directory */
   94 #define NBPTD           (NPGPTD << PAGE_SHIFT)
   95 /* Number of PDEs in page directory, 2048 for PAE, 1024 for non-PAE */
   96 #define NPDEPTD         (NBPTD / sizeof(pd_entry_t))
   97 /* Number of PDEs in one page of the page directory, 512 vs. 1024 */
   98 #define NPDEPG          (PAGE_SIZE / sizeof(pd_entry_t))
   99 #define PDRMASK         (NBPDR - 1)
  100 #ifndef PDRSHIFT
  101 #define PDRSHIFT        i386_pmap_PDRSHIFT
  102 #endif
  103 #ifndef NBPDR
  104 #define NBPDR           (1 << PDRSHIFT) /* bytes/page dir */
  105 #endif
  106 
  107 #define MAXPAGESIZES    2       /* maximum number of supported page sizes */
  108 
  109 #define IOPAGES 2               /* pages of i/o permission bitmap */
  110 
  111 #ifndef KSTACK_PAGES
  112 #define KSTACK_PAGES 4          /* Includes pcb! */
  113 #endif
  114 #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
  115 #if KSTACK_PAGES < 4
  116 #define TD0_KSTACK_PAGES 4
  117 #else
  118 #define TD0_KSTACK_PAGES KSTACK_PAGES
  119 #endif
  120 
  121 /*
  122  * Ceiling on amount of swblock kva space, can be changed via
  123  * the kern.maxswzone /boot/loader.conf variable.
  124  *
  125  * 276 is sizeof(struct swblock), but we do not always have a definition
  126  * in scope for struct swblock, so we have to hardcode it.  Each struct
  127  * swblock holds metadata for 32 pages, so in theory, this is enough for
  128  * 16 GB of swap.  In practice, however, the usable amount is considerably
  129  * lower due to fragmentation.
  130  */
  131 #ifndef VM_SWZONE_SIZE_MAX
  132 #define VM_SWZONE_SIZE_MAX      (276 * 128 * 1024)
  133 #endif
  134 
  135 /*
  136  * Ceiling on size of buffer cache (really only effects write queueing,
  137  * the VM page cache is not effected), can be changed via
  138  * the kern.maxbcache /boot/loader.conf variable.
  139  *
  140  * The value is equal to the size of the auto-tuned buffer map for
  141  * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc().
  142  */
  143 #ifndef VM_BCACHE_SIZE_MAX
  144 #define VM_BCACHE_SIZE_MAX      (7224 * 16 * 1024)
  145 #endif
  146 
  147 /*
  148  * Mach derived conversion macros
  149  */
  150 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  151 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  152 #define trunc_4mpage(x)         ((x) & ~PDRMASK)
  153 #define round_4mpage(x)         ((((x)) + PDRMASK) & ~PDRMASK)
  154 
  155 #define atop(x)                 ((x) >> PAGE_SHIFT)
  156 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  157 
  158 #define i386_btop(x)            ((x) >> PAGE_SHIFT)
  159 #define i386_ptob(x)            ((x) << PAGE_SHIFT)
  160 
  161 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  162 
  163 #define INKERNEL(va)            (TRUE)
  164 
  165 #endif /* !_I386_INCLUDE_PARAM_H_ */

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