IdealSRAM.cc

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/*
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/**
 * @file IdealSRAM.cc
 *
 * Definition of IdealSRAM class.
 *
 * @author Jussi Nykänen 2004 (nykanen-no.spam-cs.tut.fi)
 * @author Pekka Jääskeläinen 2005 (pjaaskel-no.spam-cs.tut.fi)
 * @note rating: red
 */
 
#include <string>
#include <utility>
 
#include "IdealSRAM.hh"
#include "MemoryContents.hh"
#include "Conversion.hh"
#include "Application.hh"
 
using std::string;
 
 
/**
 * Constructor. Create a model for a given memory.
 *
 * The created memory model is empty. No data is allocated for its contents.
 *
 * @param start First address of the memory.
 * @param end Last address of the memory.
 * @param MAUSize Bit width of the minimum addressable unit of the memory.
 * @param wordSize Number of MAUs that make up a natural word.
 * @param align Alignment of natural words, expressed in number of MAUs.
 */
IdealSRAM::IdealSRAM(ULongWord start, ULongWord end, Word MAUSize, bool littleEndian) :
    Memory(start, end, MAUSize, littleEndian), start_(start), end_(end), 
    MAUSize_(MAUSize) {
    data_ = new MemoryContents(end_ - start_);
}
 
 
/**
 * Destructor.
 *
 * The storage reserved for the memory contents is deallocated. Any data
 * about pending access requests is freed, too.
 */
IdealSRAM::~IdealSRAM() {
    delete data_;
    data_ = NULL;
}
 
/**
 * Writes a single memory location.
 *
 * The fastest way to write to the memory.
 *
 * @param address The target address.
 * @param data The data to write.
 */
void
IdealSRAM::write(ULongWord address, MAU data) {
    data_->writeData(address - start_, data);
}
 
/**
 * Reads a single memory location.
 *
 * The fastest way to read the memory.
 *
 * @param address The address to read.
 * @return The data read.
 */
Memory::MAU
IdealSRAM::read(ULongWord address) {
    return data_->readData(address - start_);
}
 
/**
 * Fills the whole memory with zeros.
 *
 * This is needed due to some buggy simulated programs which expect
 * uninitialized data to be zero.
 */
void
IdealSRAM::fillWithZeros() {
    data_->clear();
}