60e4ad955d
Encapsulate all ruby-related files in a ruby namespace. Change-Id: If642c9751ecefc35b45c5dd69d85e67813cc5224 Issued-on: https://gem5.atlassian.net/browse/GEM5-984 Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47307 Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu> Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com>
112 lines
3.2 KiB
C++
112 lines
3.2 KiB
C++
/*
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* Copyright (c) 2012 Advanced Micro Devices, Inc.
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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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*
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* Author: Brad Beckmann
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*
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*/
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#include "mem/ruby/structures/BankedArray.hh"
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#include "base/intmath.hh"
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#include "mem/ruby/system/RubySystem.hh"
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#include "sim/cur_tick.hh"
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namespace gem5
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{
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namespace ruby
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{
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BankedArray::BankedArray(unsigned int banks, Cycles accessLatency,
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unsigned int startIndexBit, RubySystem *rs)
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: m_ruby_system(rs)
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{
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this->banks = banks;
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this->accessLatency = accessLatency;
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this->startIndexBit = startIndexBit;
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if (banks != 0) {
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bankBits = floorLog2(banks);
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}
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busyBanks.resize(banks);
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}
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bool
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BankedArray::tryAccess(int64_t idx)
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{
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if (accessLatency == 0)
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return true;
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unsigned int bank = mapIndexToBank(idx);
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assert(bank < banks);
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if (busyBanks[bank].endAccess >= curTick()) {
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return false;
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}
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return true;
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}
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void
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BankedArray::reserve(int64_t idx)
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{
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if (accessLatency == 0)
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return;
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unsigned int bank = mapIndexToBank(idx);
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assert(bank < banks);
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if (busyBanks[bank].endAccess >= curTick()) {
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if (busyBanks[bank].startAccess == curTick() &&
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busyBanks[bank].idx == idx) {
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// this is the same reservation (can happen when
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// e.g., reserve the same resource for read and write)
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return; // OK
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} else {
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panic("BankedArray reservation error");
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}
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}
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busyBanks[bank].idx = idx;
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busyBanks[bank].startAccess = curTick();
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busyBanks[bank].endAccess = curTick() +
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(accessLatency-1) * m_ruby_system->clockPeriod();
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}
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unsigned int
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BankedArray::mapIndexToBank(int64_t idx)
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{
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if (banks == 1) {
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return 0;
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}
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return idx % banks;
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}
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} // namespace ruby
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} // namespace gem5
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