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/**
* Copyright (c) 2018 Inria
* 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.
*
* Authors: Daniel Carvalho
*/
/** @file
* Definition of a simple sector block class. Each sector consists of a
* sequence of cache blocks that may or may not be present in the cache.
*/
#ifndef __MEM_CACHE_TAGS_SECTOR_BLK_HH__
#define __MEM_CACHE_TAGS_SECTOR_BLK_HH__
#include <vector>
#include "mem/cache/cache_blk.hh"
#include "mem/cache/replacement_policies/replaceable_entry.hh"
class SectorBlk;
/**
* A sector is composed of sub-blocks, and each sub-block has information
* regarding its sector and a pointer to its sector tag.
*/
class SectorSubBlk : public CacheBlk
{
private:
/**
* Sector block associated to this block.
*/
SectorBlk* _sectorBlk;
/**
* The offset of this sub-block in the sector.
*/
int _sectorOffset;
public:
SectorSubBlk() : CacheBlk(), _sectorBlk(nullptr), _sectorOffset(0) {}
SectorSubBlk(const SectorSubBlk&) = delete;
SectorSubBlk& operator=(const SectorSubBlk&) = delete;
~SectorSubBlk() {};
/**
* Set sector block associated to this block.
*
* @param sector_blk The sector block pointer.
*/
void setSectorBlock(SectorBlk* sector_blk);
/**
* Get sector block associated to this block.
*
* @return The sector block pointer.
*/
const SectorBlk* getSectorBlock() const;
/**
* Set offset of this sub-block within the sector.
*
* @param sector_offset The block's offset.
*/
void setSectorOffset(const int sector_offset);
/**
* Get offset of this sub-block within the sector.
*
* @return sector_offset The block's offset.
*/
int getSectorOffset() const;
/**
* Get tag associated to this block.
*
* @return The tag value.
*/
Addr getTag() const;
/**
* Set valid bit and inform sector block.
*/
void setValid() override;
/**
* Set secure bit and inform sector block.
*/
void setSecure() override;
/**
* Invalidate the block and inform sector block.
*/
void invalidate() override;
/**
* Set member variables when a block insertion occurs. Resets reference
* count to 1 (the insertion counts as a reference), and touch block if
* it hadn't been touched previously. Sets the insertion tick to the
* current tick. Marks the block valid.
*
* @param tag Block address tag.
* @param is_secure Whether the block is in secure space or not.
* @param src_master_ID The source requestor ID.
* @param task_ID The new task ID.
*/
void insert(const Addr tag, const bool is_secure, const int src_master_ID,
const uint32_t task_ID) override;
/**
* Pretty-print sector offset and other CacheBlk information.
*
* @return string with basic state information
*/
std::string print() const override;
};
/**
* A Basic Sector block.
* Contains the tag and a list of blocks associated to this sector.
*/
class SectorBlk : public ReplaceableEntry
{
private:
/**
* Sector tag value. A sector's tag is the tag of all its sub-blocks.
*/
Addr _tag;
/**
* Counter of the number of valid sub-blocks. The sector is valid if any
* of its sub-blocks is valid.
*/
uint8_t _validCounter;
/**
* Whether sector blk is in secure-space or not.
*/
bool _secureBit;
public:
SectorBlk();
SectorBlk(const SectorBlk&) = delete;
SectorBlk& operator=(const SectorBlk&) = delete;
~SectorBlk() {};
/** List of blocks associated to this sector. */
std::vector<SectorSubBlk*> blks;
/**
* Checks that a sector block is valid.
*
* @return True if any of the blocks in the sector is valid.
*/
bool isValid() const;
/**
* Checks that a sector block is secure. A single secure block suffices
* to imply that the whole sector is secure, as the insertion proccess
* asserts that different secure spaces can't coexist in the same sector.
*
* @return True if any of the blocks in the sector is secure.
*/
bool isSecure() const;
/**
* Set tag associated to this block.
*
* @param The tag value.
*/
void setTag(const Addr tag);
/**
* Get tag associated to this block.
*
* @return The tag value.
*/
Addr getTag() const;
/**
* Increase the number of valid sub-blocks.
*/
void validateSubBlk();
/**
* Decrease the number of valid sub-blocks.
*/
void invalidateSubBlk();
/**
* Set secure bit.
*/
void setSecure();
};
#endif //__MEM_CACHE_TAGS_SECTOR_BLK_HH__
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