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/*
* Copyright (c) 2008 Mark D. Hill and David A. Wood
* All rights reserved.
*
* 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.
*/
#ifndef __MEM_RUBY_SYSTEM_DMASEQUENCER_HH__
#define __MEM_RUBY_SYSTEM_DMASEQUENCER_HH__
#include <ostream>
#include "mem/ruby/common/DataBlock.hh"
#include "mem/ruby/system/RubyPort.hh"
#include "params/DMASequencer.hh"
struct DMARequest
{
uint64_t start_paddr;
int len;
bool write;
int bytes_completed;
int bytes_issued;
uint8* data;
PacketPtr pkt;
};
class DMASequencer : public RubyPort
{
public:
typedef DMASequencerParams Params;
DMASequencer(const Params *);
void init();
/* external interface */
RequestStatus makeRequest(PacketPtr pkt);
bool busy() { return m_is_busy;}
int outstandingCount() const { return (m_is_busy ? 1 : 0); }
bool isDeadlockEventScheduled() const { return false; }
void descheduleDeadlockEvent() {}
/* SLICC callback */
void dataCallback(const DataBlock & dblk);
void ackCallback();
void printConfig(std::ostream & out);
private:
void issueNext();
private:
bool m_is_busy;
uint64_t m_data_block_mask;
DMARequest active_request;
int num_active_requests;
};
#endif // __MEM_RUBY_SYSTEM_DMASEQUENCER_HH__
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