xref: /gem5/src/mem/AddrMapper.py

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# Authors: Andreas Hansson

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

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

    # one port in each direction
    master = MasterPort("Master port")
    slave = SlavePort("Slave 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'

    # 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")