src/mem/AddrMapper.py

# Copyright (c) 2012 ARM Limited
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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"
    )