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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/usr/diag/prdf/common/framework/register/prdfRegisterCache.H $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2012,2019 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
#ifndef REG_CACHE_H
#define REG_CACHE_H
/** @file prdfRegisterCache.H */
#include <map>
#include <prdfBitString.H>
#include <prdfGlobal.H>
#include <prdfScanFacility.H>
#include <prdfScomRegisterAccess.H>
#include <prdfTargetFwdRef.H>
class BitString;
namespace PRDF
{
/**
* @brief Caches the contents of registers used during analysis.
*
* It maintains the latest content of a register in a map. If contents of the
* register remain unchanged, register read returns contents stored in
* cache rather than reading from hardware. Hence it brings efficiency in read.
* Whenever write to actual hardware takes place, it is expected that once write
* to hardware succeeds, the user of cache shall call flush. It drops the
* particular register from map. As a result, when read takes place from same
* register next time, read from cache fails and actual access to hardware
* takes place.
*/
class RegDataCache
{
public:
/**
* @brief Constructor
*/
RegDataCache()
{ }
/**
* @brief Destructor
*/
~RegDataCache();
/**
* @brief Returns reference to singleton instance of the RegDataCache.
* @return The singleton reference.
*/
static RegDataCache & getCachedRegisters();
/**
* @brief Returns the data buffer for the given target and address.
* @param i_chip The target associated with the register.
* @param i_reg Pointer to register to be read.
* @return A reference to the data buffer associated with the register.
*/
BitString & read( ExtensibleChip * i_chip,
const SCAN_COMM_REGISTER_CLASS * i_reg );
/**
* @brief Flushes entire contents from cache.
*/
void flush();
/**
* @brief Removes a single entry from the cache.
* @param i_pChip The rulechip associated with the register.
* @param i_pRegister points to the register to be flushed from cache.
*/
void flush( ExtensibleChip* i_pChip,
const SCAN_COMM_REGISTER_CLASS * i_pRegister );
/**
* @brief Queries if a specific entry exist in cache.
* @param i_pChip The rulechip associated with the register.
* @param i_pRegister base part of register entry to be queried in cache.
* @return pointer to cache entry associated with a given register
*/
BitString * queryCache( ExtensibleChip* i_pChip,
const SCAN_COMM_REGISTER_CLASS * i_pRegister )const;
/**
* @brief Queries if a specific entry exist in cache.
* @param i_scomAccessKey Reference to register to be queried.
* @return pointer to cache entry associated with a given register
*/
BitString * queryCache(
const ScomRegisterAccess & i_scomAccessKey )const;
private: // data
typedef std::map<ScomRegisterAccess, BitString *> CacheDump;
CacheDump iv_cachedRead;
};
PRDF_DECLARE_SINGLETON(RegDataCache, ReadCache);
} // namespace PRDF
#endif // REG_CACHE_H
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