LEDataSection.cc

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
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    Software is furnished to do so, subject to the following conditions:
 
    The above copyright notice and this permission notice shall be included in
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    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 */
/**
 * @file DataSection.cc
 *
 * Non-inline definitions of DataSection class.
 *
 * @author Heikki Kultala 2014(hkultala-no.spam-cs.tut.fi)
 * @author Pekka Jääskeläinen 2006 (pjaaskel-no.spam-cs.tut.fi)
 *
 * @note rating: yellow
 */
 
#include <cmath>
 
#include "LEDataSection.hh"
#include "Application.hh"
#include "Swapper.hh"
#include "MathTools.hh"
 
namespace TPEF {
 
LEDataSection LEDataSection::proto_(true);
 
/**
 * Constructor.
 *
 * @param init true if registeration is wanted
 */
LEDataSection::LEDataSection(bool init) : DataSection(false) {
    
    if (init) {
        Section::registerSection(this);
    }
 
    unsetFlagVLen();
    unsetFlagNoBits();
}
 
/**
 * Destructor.
 */
LEDataSection::~LEDataSection() {
}
 
/**
 * Returns section's type.
 *
 * @return Type of section.
 */
Section::SectionType
LEDataSection::type() const {
    return ST_LEDATA;
}
 
/**
 * Creates an instance of DataSection.
 *
 * @return Newly created section.
 */
Section*
LEDataSection::clone() const {
    
    return new LEDataSection(false);
}
 
 
/**
 * Writes unsigned value to data section.
 *
 * Value is aligned to field as normal big endian value
 * least significant bit is stored to last bit of last MAU.
 *
 * If we call writeValue(0, 4, 3) and MAU is 2bit
 * start of data section will be 00 00 00 11.
 *
 * However the MAUs are stored in data section like this:
 * 00000000|000000000|00000000|00000011 (one MAU per byte)
 *    MAU1 |   MAU2  |  MAU3  | MAU4
 *
 * @param index MAU offset to section where to we write value.
 * @param numOfMAUs Number of MAUs that we use for storing value.
 * @param value Value to write.
 */
void
LEDataSection::writeValue(Word index, Word numOfMAUs, unsigned long value) {
 
    int mauInBytes = MAUsToBytes(1);    
    
    MinimumAddressableUnit mauMask = 
        static_cast<unsigned int>(-1) >> 
        (sizeof(mauMask)*BYTE_BITWIDTH - aSpace()->MAU());
    
    int shiftCount = 0;
    // start writing from beginning of area..
    for (unsigned int i = 0; i < numOfMAUs; i++) {
        int byteOffset = MAUsToBytes(index + i);
        
        MinimumAddressableUnit currentMAU = 0;
        
        if (shiftCount < static_cast<int>(sizeof(value)*BYTE_BITWIDTH)) {
            // I tried math tools... system tests went broken :(
            // ssooo... if it's not broken.... 
            currentMAU = (value >> shiftCount) & mauMask;
        }
        
        shiftCount += aSpace()->MAU();
        
        // write current MAU :)
        for (int j = mauInBytes-1; j >= 0; j--) {
            Byte currentByte = static_cast<Byte>(currentMAU);
            setByte(byteOffset + j, currentByte);
            currentMAU = currentMAU >> BYTE_BITWIDTH;
        }
    }
}
 
/**
 * Writes signed value to data section.
 *
 * For example, when we call writeValue(0, 4, -3) and MAU is 2bit
 * start of data section will be 11 11 11 01.
 * 
 * MAUs are stored in data section like this:
 * 00000011 000000011 00000011 00000001 (one MAU per byte)
 *
 * If we call writeValue(0, 4, -3) and MAU is 10bit
 * start of data section will be 1111111111 1111111111 1111111111 1111111101.
 *
 * However the MAUs are stored in data section like this:
 *
 * 00000011 11111111|00000011 11111111|00000011 11111111|00000011 11111101|
 *       MAU1       |      MAU2       |      MAU3       |      MAU4       |
 *
 * @param index MAU offset to section where to we write value.
 * @param numOfMAUs Number of MAUs that we use for storing value.
 * @param value Value to write.
 */
void
LEDataSection::writeValue(Word index, Word numOfMAUs, signed long value) { 
 
    int mauInBytes = MAUsToBytes(1);    
    
    MinimumAddressableUnit mauMask = 
        static_cast<unsigned int>(-1) >> 
        (sizeof(mauMask)*BYTE_BITWIDTH - aSpace()->MAU());
    
    int shiftCount = 0;
    // start writing from beginning of area..
    for (unsigned int i = 0; i < numOfMAUs; i++) {
        int byteOffset = MAUsToBytes(index + i);
        
        MinimumAddressableUnit currentMAU = 
            static_cast<MinimumAddressableUnit>(~0);
        
        if (shiftCount < static_cast<int>(sizeof(value)*BYTE_BITWIDTH)) {
            // I tried math tools... system tests went broken :(
            // ssooo... if it's not broken.... 
            currentMAU = (value >> shiftCount) & mauMask;
            shiftCount += aSpace()->MAU();
        }
        
        // write current MAU :)
        for (int j = mauInBytes-1; j >= 0; j--) {
            Byte currentByte = static_cast<Byte>(currentMAU);
            setByte(byteOffset + j,currentByte);
            currentMAU = currentMAU >> BYTE_BITWIDTH;
        }
    }
}
 
}