#  Copyright 2009 Max Howell and other contributors.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions
#  are met:
#
#  1. Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#  2. Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
#  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
#  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
#  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
#  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
#  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
#  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
#  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

class Hardware
  # These methods use info spewed out by sysctl.
  # Look in <mach/machine.h> for decoding info.

  def self.cpu_type
    @@cpu_type ||= `/usr/sbin/sysctl -n hw.cputype`.to_i

    case @@cpu_type
    when 7
      :intel
    when 18
      :ppc
    else
      :dunno
    end
  end

  def self.intel_family
    @@intel_family ||= `/usr/sbin/sysctl -n hw.cpufamily`.to_i

    case @@intel_family
    when 0x73d67300 # Yonah: Core Solo/Duo
      :core
    when 0x426f69ef # Merom: Core 2 Duo
      :core2
    when 0x78ea4fbc # Penryn
      :penryn
    when 0x6b5a4cd2 # Nehalem
      :nehalem
    else
      :dunno
    end
  end

  def self.processor_count
    @@processor_count ||= `/usr/sbin/sysctl -n hw.ncpu`.to_i
  end

  def self.is_64_bit?
    self.sysctl_bool("hw.cpu64bit_capable")
  end

protected
  def self.sysctl_bool(property)
    result = nil
    IO.popen("/usr/sbin/sysctl -n #{property} 2>/dev/null") do |f|
      result = f.gets.to_i # should be 0 or 1
    end
    $?.success? && result == 1 # sysctl call succeded and printed 1
  end
end