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  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   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: @(#)param.h       5.8 (Berkeley) 6/28/91
   37  * $FreeBSD: stable/4/sys/i386/include/param.h 118695 2003-08-09 16:21:21Z luoqi $
   38  */
   39 
   40 /*
   41  * Machine dependent constants for Intel 386.
   42  */
   43 
   44 /*
   45  * Round p (pointer or byte index) up to a correctly-aligned value
   46  * for all data types (int, long, ...).   The result is unsigned int
   47  * and must be cast to any desired pointer type.
   48  */
   49 #ifndef _ALIGNBYTES
   50 #define _ALIGNBYTES     (sizeof(int) - 1)
   51 #endif
   52 #ifndef _ALIGN
   53 #define _ALIGN(p)       (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
   54 #endif
   55 
   56 #ifndef _MACHINE
   57 #define _MACHINE        i386
   58 #endif
   59 #ifndef _MACHINE_ARCH
   60 #define _MACHINE_ARCH   i386
   61 #endif
   62 
   63 #ifndef _NO_NAMESPACE_POLLUTION
   64 
   65 #ifndef _MACHINE_PARAM_H_
   66 #define _MACHINE_PARAM_H_
   67 
   68 #ifndef MACHINE
   69 #define MACHINE         "i386"
   70 #endif
   71 #ifndef MACHINE_ARCH
   72 #define MACHINE_ARCH    "i386"
   73 #endif
   74 #define MID_MACHINE     MID_I386
   75 
   76 /*
   77  * OBJFORMAT_NAMES is a comma-separated list of the object formats
   78  * that are supported on the architecture.
   79  */
   80 #define OBJFORMAT_NAMES         "elf", "aout"
   81 #define OBJFORMAT_DEFAULT       "elf"
   82 
   83 #ifdef SMP
   84 #define MAXCPU          16
   85 #else
   86 #define MAXCPU          1
   87 #endif /* SMP */
   88 
   89 #define ALIGNBYTES      _ALIGNBYTES
   90 #define ALIGN(p)        _ALIGN(p)
   91 
   92 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   93 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   94 #define PAGE_MASK       (PAGE_SIZE-1)
   95 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   96 
   97 #ifdef PAE
   98 #define NPGPTD          4
   99 #define PDRSHIFT        21              /* LOG2(NBPDR) */
  100 #else
  101 #define NPGPTD          1
  102 #define PDRSHIFT        22              /* LOG2(NBPDR) */
  103 #endif
  104 
  105 #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
  106 #define PDRMASK         (NBPDR-1)
  107 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
  108 #define NPDEPTD         (NPDEPG*NPGPTD)
  109 
  110 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  111 #define DEV_BSIZE       (1<<DEV_BSHIFT)
  112 
  113 #ifndef BLKDEV_IOSIZE
  114 #define BLKDEV_IOSIZE   PAGE_SIZE       /* default block device I/O size */
  115 #endif
  116 #define DFLTPHYS        (64 * 1024)     /* default max raw I/O transfer size */
  117 #define MAXPHYS         (128 * 1024)    /* max raw I/O transfer size */
  118 #define MAXDUMPPGS      (DFLTPHYS/PAGE_SIZE)
  119 
  120 #define IOPAGES 2               /* pages of i/o permission bitmap */
  121 #define UPAGES  3               /* pages of u-area */
  122 
  123 /*
  124  * Ceiling on amount of swblock kva space, can be changed via
  125  * kern.maxswzone /boot/loader.conf variable.
  126  */
  127 #ifndef VM_SWZONE_SIZE_MAX
  128 #define VM_SWZONE_SIZE_MAX      (32 * 1024 * 1024)
  129 #endif
  130 
  131 /*
  132  * Ceiling on size of buffer cache (really only effects write queueing,
  133  * the VM page cache is not effected), can be changed via
  134  * kern.maxbcache /boot/loader.conf variable.
  135  */
  136 #ifndef VM_BCACHE_SIZE_MAX
  137 #define VM_BCACHE_SIZE_MAX      (200 * 1024 * 1024)
  138 #endif
  139 
  140 
  141 /*
  142  * Constants related to network buffer management.
  143  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  144  * on machines that exchange pages of input or output buffers with mbuf
  145  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  146  * of the hardware page size.
  147  */
  148 #ifndef MSIZE
  149 #define MSIZE           256             /* size of an mbuf */
  150 #endif  /* MSIZE */
  151 
  152 #ifndef MCLSHIFT
  153 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
  154 #endif  /* MCLSHIFT */
  155 #define MCLBYTES        (1 << MCLSHIFT) /* size of an m_buf cluster */
  156 #define MCLOFSET        (MCLBYTES - 1)  /* offset within an m_buf cluster */
  157 
  158 /*
  159  * Some macros for units conversion
  160  */
  161 
  162 /* clicks to bytes */
  163 #define ctob(x) ((x)<<PAGE_SHIFT)
  164 
  165 /* bytes to clicks */
  166 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
  167 
  168 /*
  169  * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We
  170  * want to shift an unsigned type to avoid sign extension and we don't
  171  * want to widen `bytes' unnecessarily.  Assume that the result fits in
  172  * a daddr_t.
  173  */
  174 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
  175         (sizeof (bytes) > sizeof(long) \
  176          ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
  177          : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
  178 
  179 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
  180         ((off_t)(db) << DEV_BSHIFT)
  181 
  182 /*
  183  * Mach derived conversion macros
  184  */
  185 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  186 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  187 #define trunc_4mpage(x)         ((x) & ~PDRMASK)
  188 #define round_4mpage(x)         ((((x)) + PDRMASK) & ~PDRMASK)
  189 
  190 #define atop(x)                 ((x) >> PAGE_SHIFT)
  191 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  192 
  193 #define i386_btop(x)            ((x) >> PAGE_SHIFT)
  194 #define i386_ptob(x)            ((x) << PAGE_SHIFT)
  195 
  196 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  197 
  198 #ifdef _KERNEL
  199 
  200 /*
  201  * We put here the definition of two debugging macros/function which
  202  * are very convenient to have available.
  203  * The macro is called TSTMP() and is used to timestamp events in the
  204  * kernel using the TSC register, and export them to userland through
  205  * the sysctl variable debug.timestamp, which is a circular buffer
  206  * holding pairs of u_int32_t variables <timestamp, argument> .
  207  * They can be retrieved with something like
  208  *
  209  *      sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
  210  *
  211  * The function _TSTMP() is defined in i386/isa/clock.c. It does not
  212  * try to grab any locks or block interrupts or identify which CPU it
  213  * is running on. You are supposed to know what to do if you use it.
  214  *
  215  * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
  216  * config file, otherwise they default to an empty block.
  217  */
  218 
  219 #ifdef KERN_TIMESTAMP
  220 extern void _TSTMP(u_int32_t argument);
  221 #define TSTMP(class, unit, event, par)  _TSTMP( \
  222         (((class) &   0x0f) << 28 ) |           \
  223         (((unit)  &   0x0f) << 24 ) |           \
  224         (((event) &   0xff) << 16 ) |           \
  225         (((par)   & 0xffff)       )   )
  226 
  227 #else /* !KERN_TIMESTAMP */
  228 #define        _TSTMP(x)                       {}
  229 #define        TSTMP(class, unit, event, par)  _TSTMP(0)
  230 #endif /* !KERN_TIMESTAMP */
  231 #endif /* _KERNEL */
  232 
  233 #endif /* !_MACHINE_PARAM_H_ */
  234 #endif /* !_NO_NAMESPACE_POLLUTION */

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