hades.models.mips.mipsmemory
Class AccessMemory

java.lang.Object
  hades.models.mips.mipsmemory.AccessMemory

All Implemented Interfaces:

Memory, Resetable

Direct Known Subclasses:

FastAccessMemory

public class AccessMemory

extends java.lang.Object

implements Resetable, Memory

Handle memory and cache accesses with one class which dispatches the different requests to the different MipsMemories Tasks performed by this class: - static address translation - call of dynamic address translation - decision wether and which caches should be used - modify partial word accesses to word accesses - provide Memory interface to give access to the full virtual address space

Field Summary

protected boolean	bigEndian
protected int[]	byteReadMask
protected int[]	byteWriteMask
protected int	data
Cache	dataCache
protected int	dataMask
protected int	dataShift
MipsMemory	dcache
static int	DCACHE_SIZE
protected MipsMemory[]	dcacheSelection
protected boolean	debug
MemoryDispatcher	dispatcher
protected int[]	halfwordReadMask
protected int[]	halfwordWriteMask
MipsMemory	icache
static int	ICACHE_SIZE
protected MipsMemory[]	icacheSelection
protected int	instr
Cache	instrCache
MipsMemory	lastdcache
MipsMemory	lasticache
MipsMemory	mem
static int	MEMORY_SIZE
protected MemoryManagementUnit	mmu
protected PartHandler	partHandler
protected boolean	partWordByte
protected boolean	partWordFirst
protected boolean	partWordTriple
protected boolean	partWordWrite
protected int	physicalDataAdr
protected int	physicalInstrAdr
DataCache	realDataCache
InstrCache	realInstrCache
TinyBPMemory	stack
static int	STACK_SIZE
TinyBPMemory	tinyMemory
protected boolean[]	translateable
protected int[]	translation
protected int[]	triplebyteReadMask
protected int[]	triplebyteWriteMask
protected int	virtualDataAdr
protected int	virtualInstrAdr

Constructor Summary

AccessMemory(PartHandler newPartHandler)

Method Summary

boolean	beginCycle() Cycle
void	endCycle()
int	fetchInstr()
boolean	getBigEndian()
boolean	getLog() Get debug mode
int	getMemorySize() Capacity of the memory in words
int	getReadResult()
int	getWordWidth() Witdh of one word in bits
protected void	initCacheSelection(MipsMemory[] cacheSelection, MipsMemory cache, MipsMemory mem)
void	installEntryHandler(EntryHandler entryHandler) setEntry() calles this EntryHandler
void	invalidateCaches()
void	por() Power on reset or hardware reset
void	readInstr() Instruction fetch, always 32 bit
int	readMemory(int address) Read a word from the memory
void	readWord(int adr) Load data
void	reset() software reset
void	setBigEndian(boolean big) Set endianess
void	setEntry(int entry, int globalPointer) Set the entry address if memory contains a executable program
void	setLog(boolean newDebug) Enable or disable logging output
void	swapCaches()
int	translateAddress(int adr)
protected int	translateAddress(int adr, int segment) Address translation
int	translateDataAdr(int adr)
int	translateInstrAdr(int adr)
int	translateWordAddress(int adr)
void	unswapCaches()
void	writeMemory(int address, int word) Write a word into the memory
void	writeWord(int adr, int value) Store data

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

partHandler

protected PartHandler partHandler

realInstrCache

public InstrCache realInstrCache

realDataCache

public DataCache realDataCache

instrCache

public Cache instrCache

dataCache

public Cache dataCache

tinyMemory

public TinyBPMemory tinyMemory

stack

public TinyBPMemory stack

dispatcher

public MemoryDispatcher dispatcher

mem

public MipsMemory mem

icache

public MipsMemory icache

dcache

public MipsMemory dcache

lasticache

public MipsMemory lasticache

lastdcache

public MipsMemory lastdcache

mmu

protected MemoryManagementUnit mmu

MEMORY_SIZE

public static final int MEMORY_SIZE

See Also:

Constant Field Values

ICACHE_SIZE

public static final int ICACHE_SIZE

See Also:

Constant Field Values

DCACHE_SIZE

public static final int DCACHE_SIZE

See Also:

Constant Field Values

STACK_SIZE

public static final int STACK_SIZE

See Also:

Constant Field Values

bigEndian

protected boolean bigEndian

virtualInstrAdr

protected int virtualInstrAdr

physicalInstrAdr

protected int physicalInstrAdr

virtualDataAdr

protected int virtualDataAdr

physicalDataAdr

protected int physicalDataAdr

instr

protected int instr

data

protected int data

translateable

protected boolean[] translateable

translation

protected int[] translation

icacheSelection

protected MipsMemory[] icacheSelection

dcacheSelection

protected MipsMemory[] dcacheSelection

halfwordWriteMask

protected int[] halfwordWriteMask

byteWriteMask

protected int[] byteWriteMask

triplebyteWriteMask

protected int[] triplebyteWriteMask

halfwordReadMask

protected int[] halfwordReadMask

byteReadMask

protected int[] byteReadMask

triplebyteReadMask

protected int[] triplebyteReadMask

partWordWrite

protected boolean partWordWrite

partWordFirst

protected boolean partWordFirst

partWordByte

protected boolean partWordByte

partWordTriple

protected boolean partWordTriple

dataMask

protected int dataMask

dataShift

protected int dataShift

debug

protected boolean debug

Constructor Detail

AccessMemory

public AccessMemory(PartHandler newPartHandler)

Method Detail

initCacheSelection

protected void initCacheSelection(MipsMemory[] cacheSelection,
                                  MipsMemory cache,
                                  MipsMemory mem)

por

public void por()

Power on reset or hardware reset

Specified by:

por in interface Resetable

reset

public void reset()

software reset

Specified by:

reset in interface Resetable

setLog

public void setLog(boolean newDebug)

Description copied from interface: Memory

Enable or disable logging output

Specified by:

setLog in interface Memory

getLog

public boolean getLog()

Description copied from interface: Memory

Get debug mode

Specified by:

getLog in interface Memory

invalidateCaches

public void invalidateCaches()

swapCaches

public void swapCaches()

unswapCaches

public void unswapCaches()

setBigEndian

public void setBigEndian(boolean big)

Set endianess

getBigEndian

public boolean getBigEndian()

translateAddress

protected int translateAddress(int adr,
                               int segment)

Address translation

translateAddress

public int translateAddress(int adr)

translateWordAddress

public int translateWordAddress(int adr)

translateInstrAdr

public int translateInstrAdr(int adr)

translateDataAdr

public int translateDataAdr(int adr)

readInstr

public void readInstr()

Instruction fetch, always 32 bit

fetchInstr

public int fetchInstr()

readWord

public void readWord(int adr)

Load data

getReadResult

public int getReadResult()

writeWord

public void writeWord(int adr,
                      int value)

Store data

beginCycle

public boolean beginCycle()

Cycle

endCycle

public void endCycle()

getWordWidth

public int getWordWidth()

Witdh of one word in bits

Specified by:

getWordWidth in interface Memory

getMemorySize

public int getMemorySize()

Capacity of the memory in words

Specified by:

getMemorySize in interface Memory

readMemory

public int readMemory(int address)

Read a word from the memory

Specified by:

readMemory in interface Memory

writeMemory

public void writeMemory(int address,
                        int word)

Write a word into the memory

Specified by:

writeMemory in interface Memory

setEntry

public void setEntry(int entry,
                     int globalPointer)

Set the entry address if memory contains a executable program

Specified by:

setEntry in interface Memory

installEntryHandler

public void installEntryHandler(EntryHandler entryHandler)

setEntry() calles this EntryHandler

Specified by:

installEntryHandler in interface Memory