src/mem/AddrMapper.py

# Copyright (c) 2012 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder.  You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# 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;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "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 COPYRIGHT
# OWNER OR CONTRIBUTORS 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
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

from m5.params import *
from m5.SimObject import SimObject

# An address mapper changes the packet addresses in going from the
# response port side of the mapper to the request port side. When the
# response port is queried for the address ranges, it also performs the
# necessary range updates. Note that snoop requests that travel from
# the request port (i.e. the memory side) to the response port are
# currently not modified.
class AddrMapper(SimObject):
    type = 'AddrMapper'
    cxx_header = 'mem/addr_mapper.hh'
    cxx_class = 'gem5::AddrMapper'
    abstract = True

    # one port in each direction
    mem_side_port = RequestPort("This port sends requests and "
                                "receives responses")
    master   = DeprecatedParam(mem_side_port,
                               '`master` is now called `mem_side_port`')
    cpu_side_port = ResponsePort("This port receives requests and "
                                 "sends responses")
    slave    = DeprecatedParam(cpu_side_port,
                               '`slave` is now called `cpu_side_port`')

# Range address mapper that maps a set of original ranges to a set of
# remapped ranges, where a specific range is of the same size
# (original and remapped), only with an offset.
class RangeAddrMapper(AddrMapper):
    type = 'RangeAddrMapper'
    cxx_header = 'mem/addr_mapper.hh'
    cxx_class = 'gem5::RangeAddrMapper'

    # These two vectors should be the exact same length and each range
    # should be the exact same size. Each range in original_ranges is
    # mapped to the corresponding element in the remapped_ranges. Note
    # that the same range can occur multiple times in the remapped
    # ranges for address aliasing.
    original_ranges = VectorParam.AddrRange(
        "Ranges of memory that should me remapped")
    remapped_ranges = VectorParam.AddrRange(
        "Ranges of memory that are being mapped to")