src/dev/x86/I8259.py

   1 # Copyright (c) 2008 The Regents of The University of Michigan
   2 # All rights reserved.
   3 #
   4 # Redistribution and use in source and binary forms, with or without
   5 # modification, are permitted provided that the following conditions are
   6 # met: redistributions of source code must retain the above copyright
   7 # notice, this list of conditions and the following disclaimer;
   8 # redistributions in binary form must reproduce the above copyright
   9 # notice, this list of conditions and the following disclaimer in the
  10 # documentation and/or other materials provided with the distribution;
  11 # neither the name of the copyright holders nor the names of its
  12 # contributors may be used to endorse or promote products derived from
  13 # this software without specific prior written permission.
  14 #
  15 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  17 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  18 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  19 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  20 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  21 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 #
  27 # Authors: Gabe Black
  28
  29 from m5.params import *
  30 from m5.proxy import *
  31 from Device import BasicPioDevice
  32 from X86IntPin import X86IntSourcePin, X86IntSinkPin
  33
  34 class X86I8259CascadeMode(Enum):
  35     map = {'I8259Master' : 0,
  36            'I8259Slave' : 1,
  37            'I8259Single' : 2
  38     }
  39
  40 class I8259(BasicPioDevice):
  41     type = 'I8259'
  42     cxx_class='X86ISA::I8259'
  43     cxx_header = "dev/x86/i8259.hh"
  44     output = Param.X86IntSourcePin(X86IntSourcePin(),
  45             'The pin this I8259 drives')
  46     mode = Param.X86I8259CascadeMode('How this I8259 is cascaded')
  47     slave = Param.I8259(NULL, 'Slave I8259, if any')
  48
  49     def pin(self, line):
  50         return X86IntSinkPin(device=self, number=line)