FreeBSD/Linux Kernel Cross Reference
sys/libkern/libkern/sysctl.h

     /*
      * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
      * Version 2.0 (the 'License'). You may not use this file except in
      * compliance with the License. The rights granted to you under the License
     * may not be used to create, or enable the creation or redistribution of,
     * unlawful or unlicensed copies of an Apple operating system, or to
     * circumvent, violate, or enable the circumvention or violation of, any
     * terms of an Apple operating system software license agreement.
     * 
     * Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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     * Please see the License for the specific language governing rights and
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     */
    
    #ifndef LIBKERN_SYSCTL_H
    #define LIBKERN_SYSCTL_H
    
    #include <sys/cdefs.h>
    
    __BEGIN_DECLS
    
    #include <sys/types.h>
    
    /*
     * These are the support HW selectors for sysctlbyname.  Parameters that are byte counts or frequencies are 64 bit numbers.
     * All other parameters are 32 bit numbers.
     *
     *   hw.memsize                - The number of bytes of physical memory in the system.
     *
     *   hw.ncpu                   - The maximum number of processors that could be available this boot.
     *                               Use this value for sizing of static per processor arrays; i.e. processor load statistics.
     *
     *   hw.activecpu              - The number of processors currently available for executing threads.
     *                               Use this number to determine the number threads to create in SMP aware applications.
     *                               This number can change when power management modes are changed.
     *
     *   hw.physicalcpu            - The number of physical processors available in the current power management mode.
     *   hw.physicalcpu_max        - The maximum number of physical processors that could be available this boot
     *
     *   hw.logicalcpu             - The number of logical processors available in the current power management mode.
     *   hw.logicalcpu_max         - The maximum number of logical processors that could be available this boot
     *
     *   hw.tbfrequency            - This gives the time base frequency used by the OS and is the basis of all timing services.
     *                               In general is is better to use mach's or higher level timing services, but this value
     *                               is needed to convert the PPC Time Base registers to real time.
     *
     *   hw.cpufrequency           - These values provide the current, min and max cpu frequency.  The min and max are for
     *   hw.cpufrequency_max       - all power management modes.  The current frequency is the max frequency in the current mode.
     *   hw.cpufrequency_min       - All frequencies are in Hz.
     *
     *   hw.busfrequency           - These values provide the current, min and max bus frequency.  The min and max are for
     *   hw.busfrequency_max       - all power management modes.  The current frequency is the max frequency in the current mode.
     *   hw.busfrequency_min       - All frequencies are in Hz.
     *
     *   hw.cputype                - These values provide the mach-o cpu type and subtype.  A complete list is in <mach/machine.h>
     *   hw.cpusubtype             - These values should be used to determine what processor family the running cpu is from so that
     *                               the best binary can be chosen, or the best dynamic code generated.  They should not be used
     *                               to determine if a given processor feature is available.
     *   hw.cputhreadtype          - This value will be present if the processor supports threads.  Like hw.cpusubtype this selector
     *                               should not be used to infer features, and only used to name the processors thread architecture.
     *                               The values are defined in <mach/machine.h>
     *
     *   hw.byteorder              - Gives the byte order of the processor.  4321 for big endian, 1234 for little.
     *
     *   hw.pagesize               - Gives the size in bytes of the pages used by the processor and VM system.
     *
     *   hw.cachelinesize          - Gives the size in bytes of the processor's cache lines.
     *                               This value should be use to control the strides of loops that use cache control instructions
     *                               like dcbz, dcbt or dcbst.
     *
     *   hw.l1dcachesize           - These values provide the size in bytes of the L1, L2 and L3 caches.  If a cache is not present
     *   hw.l1icachesize           - then the selector will return and error.
     *   hw.l2cachesize            -
     *   hw.l3cachesize            -
     *
     *
     * These are the selectors for optional processor features.  Selectors that return errors are not support on the system.
     * Supported features will return 1 if they are recommended or 0 if they are supported but are not expected to help performance.
     * Future versions of these selectors may return larger values as necessary so it is best to test for non zero.
     *
     *   hw.optional.floatingpoint - Floating Point Instructions
     *   hw.optional.altivec       - AltiVec Instructions
     *   hw.optional.graphicsops   - Graphics Operations
     *   hw.optional.64bitops      - 64-bit Instructions
     *   hw.optional.fsqrt         - HW Floating Point Square Root Instruction
    *   hw.optional.stfiwx        - Store Floating Point as Integer Word Indexed Instructions
    *   hw.optional.dcba          - Data Cache Block Allocate Instruction
    *   hw.optional.datastreams   - Data Streams Instructions
    *   hw.optional.dcbtstreams   - Data Cache Block Touch Steams Instruction Form
    *
    */
   
   /*
    * Sysctl handling
    */
   int     sysctlbyname(const char *, void *, size_t *, void *, size_t);
   
   __END_DECLS
   
   #endif  /* LIBKERN_SYSCTL_H */

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