Store buffer. More...

#include <lsq.hh>

Inheritance diagram for Minor::LSQ::StoreBuffer:

Public Member Functions
	StoreBuffer (std::string name_, LSQ &lsq_, unsigned int store_buffer_size, unsigned int store_limit_per_cycle)

bool	canInsert () const
	Can a new request be inserted into the queue? More...

void	deleteRequest (LSQRequestPtr request)
	Delete the given request and free the slot it occupied. More...

void	insert (LSQRequestPtr request)
	Insert a request at the back of the queue. More...

AddrRangeCoverage	canForwardDataToLoad (LSQRequestPtr request, unsigned int &found_slot)
	Look for a store which satisfies the given load. More...

void	forwardStoreData (LSQRequestPtr load, unsigned int slot_number)
	Fill the given packet with appropriate date from slot slot_number. More...

unsigned int	numUnissuedStores ()
	Number of stores in the store buffer which have not been completely issued to the memory system. More...

void	countIssuedStore (LSQRequestPtr request)
	Count a store being issued to memory by decrementing numUnissuedAccesses. More...

bool	isDrained () const
	Drained if there is absolutely nothing left in the buffer. More...

void	step ()
	Try to issue more stores to memory. More...

void	minorTrace () const
	Report queue contents for MinorTrace. More...

Public Member Functions inherited from Named
	Named (const std::string &name_)

const std::string &	name () const

Public Attributes
LSQ &	lsq
	My owner. More...

const unsigned int	numSlots
	Number of slots, this is a bound on the size of slots. More...

const unsigned int	storeLimitPerCycle
	Maximum number of stores that can be issued per cycle. More...

std::deque< LSQRequestPtr >	slots
	Queue of store requests on their way to memory. More...

unsigned int	numUnissuedAccesses
	Number of occupied slots which have not yet issued a memory access. More...

Additional Inherited Members
Protected Attributes inherited from Named
const std::string	_name

Detailed Description

Store buffer.

This contains stores which have been committed but whose memory transfers have not yet been issued. Load data can be forwarded out of the store buffer

Definition at line 470 of file lsq.hh.

Constructor & Destructor Documentation

Minor::LSQ::StoreBuffer::StoreBuffer	(	std::string	name_,
		LSQ &	lsq_,
		unsigned int	store_buffer_size,
		unsigned int	store_limit_per_cycle
	)

Definition at line 1543 of file lsq.cc.

Member Function Documentation

LSQ::AddrRangeCoverage Minor::LSQ::StoreBuffer::canForwardDataToLoad	(	LSQRequestPtr	request,
		unsigned int &	found_slot
	)

Look for a store which satisfies the given load.

Returns an indication whether the forwarding request can be wholly, partly or not all all satisfied. If the request can be wholly satisfied, the store buffer slot number which can be used is returned in found_slot

Definition at line 669 of file lsq.cc.

References Minor::LSQ::LSQRequest::containsAddrRangeOf(), DPRINTF, Request::getPaddr(), Request::getSize(), ArmISA::i, Minor::LSQ::LSQRequest::inst, Minor::LSQ::NoAddrRangeCoverage, Minor::LSQ::LSQRequest::packet, and Minor::LSQ::LSQRequest::request.

Referenced by Minor::LSQ::tryToSendToTransfers().

bool Minor::LSQ::StoreBuffer::canInsert ( ) const

Can a new request be inserted into the queue?

Definition at line 626 of file lsq.cc.

Referenced by Minor::LSQ::canPushIntoStoreBuffer(), and Minor::LSQ::findResponse().

void Minor::LSQ::StoreBuffer::countIssuedStore ( LSQRequestPtr request )

Count a store being issued to memory by decrementing numUnissuedAccesses.

Does not count barrier requests as they will be handles as barriers are cleared from the buffer

Definition at line 736 of file lsq.cc.

References Minor::LSQ::LSQRequest::isBarrier().