mem: Add a gasket that allows memory ranges to be re-mapped.

For example if DRAM is at two locations and mirrored this patch allows the
mirroring to occur.

1 files changed, 70 insertions, 0 deletions

diff --git a/src/mem/AddrMapper.py b/src/mem/AddrMapper.py
new file mode 100644
index 000000000..2b999ee92
--- /dev/null
+++ b/src/mem/AddrMapper.py
@@ -0,0 +1,70 @@
+# 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.
+#
+# Authors: Andreas Hansson
+
+from m5.params import *
+from MemObject import MemObject
+
+# 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(MemObject):
+    type = 'AddrMapper'
+    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'
+
+    # 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")