I8259.py revision 5827 
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
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8# redistributions in binary form must reproduce the above copyright
9# notice, this list of conditions and the following disclaimer in the
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11# neither the name of the copyright holders nor the names of its
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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
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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
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25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26#
27# Authors: Gabe Black
28
29from m5.params import *
30from m5.proxy import *
31from Device import BasicPioDevice
32from X86IntPin import X86IntSourcePin, X86IntSinkPin
33
34class X86I8259CascadeMode(Enum):
35    map = {'I8259Master' : 0,
36           'I8259Slave' : 1,
37           'I8259Single' : 2
38    }
39
40class I8259(BasicPioDevice):
41    type = 'I8259'
42    cxx_class='X86ISA::I8259'
43    pio_latency = Param.Latency('1ns', "Programmed IO latency in simticks")
44    output = Param.X86IntSourcePin(X86IntSourcePin(),
45            'The pin this I8259 drives')
46    mode = Param.X86I8259CascadeMode('How this I8259 is cascaded')
47    slave = Param.I8259('Slave I8259, if any')
48
49    def pin(self, line):
50        return X86IntSinkPin(device=self, number=line)
51