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: head/sys/i386/include/param.h 343567 2019-01-30 02:07:13Z kib $
   36  */
   37 
   38 
   39 #ifndef _I386_INCLUDE_PARAM_H_
   40 #define _I386_INCLUDE_PARAM_H_
   41 
   42 #include <machine/_align.h>
   43 
   44 /*
   45  * Machine dependent constants for Intel 386.
   46  */
   47 
   48 
   49 #define __HAVE_ACPI
   50 #define __HAVE_PIR
   51 #define __PCI_REROUTE_INTERRUPT
   52 
   53 #ifndef MACHINE
   54 #define MACHINE         "i386"
   55 #endif
   56 #ifndef MACHINE_ARCH
   57 #define MACHINE_ARCH    "i386"
   58 #endif
   59 #define MID_MACHINE     MID_I386
   60 
   61 #if defined(SMP) || defined(KLD_MODULE)
   62 #ifndef MAXCPU
   63 #define MAXCPU          32
   64 #endif
   65 #else
   66 #define MAXCPU          1
   67 #endif /* SMP || KLD_MODULE */
   68 
   69 #ifndef MAXMEMDOM
   70 #define MAXMEMDOM       1
   71 #endif
   72 
   73 #define ALIGNBYTES      _ALIGNBYTES
   74 #define ALIGN(p)        _ALIGN(p)
   75 /*
   76  * ALIGNED_POINTER is a boolean macro that checks whether an address
   77  * is valid to fetch data elements of type t from on this architecture.
   78  * This does not reflect the optimal alignment, just the possibility
   79  * (within reasonable limits). 
   80  */
   81 #define ALIGNED_POINTER(p, t)   1
   82 
   83 /*
   84  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
   85  * architecture.  It should be used with appropriate caution.
   86  */
   87 #define CACHE_LINE_SHIFT        6
   88 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
   89 
   90 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   91 #define PAGE_SIZE       (1 << PAGE_SHIFT)       /* bytes/page */
   92 #define PAGE_MASK       (PAGE_SIZE - 1)
   93 #define NPTEPG          (PAGE_SIZE / sizeof(pt_entry_t))
   94 
   95 /* Size in bytes of the page directory */
   96 #define NBPTD           (NPGPTD << PAGE_SHIFT)
   97 /* Number of PDEs in page directory, 2048 for PAE, 1024 for non-PAE */
   98 #define NPDEPTD         (NBPTD / sizeof(pd_entry_t))
   99 /* Number of PDEs in one page of the page directory, 512 vs. 1024 */
  100 #define NPDEPG          (PAGE_SIZE / sizeof(pd_entry_t))
  101 #define PDRMASK         (NBPDR - 1)
  102 #ifndef PDRSHIFT
  103 #define PDRSHIFT        i386_pmap_PDRSHIFT
  104 #endif
  105 #ifndef NBPDR
  106 #define NBPDR           (1 << PDRSHIFT) /* bytes/page dir */
  107 #endif
  108 
  109 #define MAXPAGESIZES    2       /* maximum number of supported page sizes */
  110 
  111 #define IOPAGES 2               /* pages of i/o permission bitmap */
  112 
  113 #ifndef KSTACK_PAGES
  114 #define KSTACK_PAGES 4          /* Includes pcb! */
  115 #endif
  116 #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
  117 #if KSTACK_PAGES < 4
  118 #define TD0_KSTACK_PAGES 4
  119 #else
  120 #define TD0_KSTACK_PAGES KSTACK_PAGES
  121 #endif
  122 
  123 /*
  124  * Ceiling on amount of swblock kva space, can be changed via
  125  * the kern.maxswzone /boot/loader.conf variable.
  126  *
  127  * 276 is sizeof(struct swblock), but we do not always have a definition
  128  * in scope for struct swblock, so we have to hardcode it.  Each struct
  129  * swblock holds metadata for 32 pages, so in theory, this is enough for
  130  * 16 GB of swap.  In practice, however, the usable amount is considerably
  131  * lower due to fragmentation.
  132  */
  133 #ifndef VM_SWZONE_SIZE_MAX
  134 #define VM_SWZONE_SIZE_MAX      (276 * 128 * 1024)
  135 #endif
  136 
  137 /*
  138  * Ceiling on size of buffer cache (really only effects write queueing,
  139  * the VM page cache is not effected), can be changed via
  140  * the kern.maxbcache /boot/loader.conf variable.
  141  *
  142  * The value is equal to the size of the auto-tuned buffer map for
  143  * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc().
  144  */
  145 #ifndef VM_BCACHE_SIZE_MAX
  146 #define VM_BCACHE_SIZE_MAX      (7224 * 16 * 1024)
  147 #endif
  148 
  149 /*
  150  * Mach derived conversion macros
  151  */
  152 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  153 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  154 #define trunc_4mpage(x)         ((x) & ~PDRMASK)
  155 #define round_4mpage(x)         ((((x)) + PDRMASK) & ~PDRMASK)
  156 
  157 #define atop(x)                 ((x) >> PAGE_SHIFT)
  158 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  159 
  160 #define i386_btop(x)            ((x) >> PAGE_SHIFT)
  161 #define i386_ptob(x)            ((x) << PAGE_SHIFT)
  162 
  163 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  164 
  165 #define INKERNEL(va)            (TRUE)
  166 
  167 #endif /* !_I386_INCLUDE_PARAM_H_ */

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