3a4e366042
This change updates the API in the component library for setting the size of memory. Now, you can set the size of the memory system as an argument to the memory object. Then, the board is responsible for figuring out what the overall memory ranges should be which it communicates back to the memory system. This should make multi-channel memories easier to implement and it fixes some confusion around things like the HiFive platform starting at 0x8000000. Change-Id: Ibef5aafbbb1177a992950cdc2bd2634dcfb81eec Signed-off-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49348 Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
74 lines
3.0 KiB
Python
74 lines
3.0 KiB
Python
# Copyright (c) 2021 The Regents of the University of California
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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from abc import ABCMeta, abstractmethod
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from typing import Tuple, Sequence, List
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from ..boards.abstract_board import AbstractBoard
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from m5.objects import AddrRange, Port, SubSystem, MemCtrl
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class AbstractMemorySystem(SubSystem):
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__metaclass__ = ABCMeta
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def __init__(self) -> None:
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super(AbstractMemorySystem, self).__init__()
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@abstractmethod
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def incorporate_memory(self, board: AbstractBoard) -> None:
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"""This function completes all of the necessary steps to add this
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memory system to the board."""
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raise NotImplementedError
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@abstractmethod
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def get_mem_ports(self) -> Sequence[Tuple[AddrRange, Port]]:
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"""Get the ports to connect this memory system to the cache"""
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raise NotImplementedError
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@abstractmethod
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def get_memory_controllers(self) -> List[MemCtrl]:
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"""Get all of the memory controllers in this memory system"""
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raise NotImplementedError
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@abstractmethod
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def get_size(self) -> int:
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"""Returns the total size of the memory system"""
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raise NotImplementedError
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@abstractmethod
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def set_memory_range(self, ranges: List[AddrRange]) -> None:
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"""Set the total range for this memory system
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May pass multiple non-overlapping ranges. The total size of the ranges
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should match the size of the memory.
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If this memory system is incompatible with the ranges, an exception
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will be raised.
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"""
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raise NotImplementedError
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