* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Ron Dreslinski
*/
/* @file
#include "base/range.hh"
#include "mem/mem_object.hh"
#include "mem/packet.hh"
-#include "mem/port.hh"
+#include "mem/tport.hh"
#include "sim/eventq.hh"
#include <map>
#include <string>
//
class PhysicalMemory : public MemObject
{
- class MemoryPort : public Port
+ class MemoryPort : public SimpleTimingPort
{
PhysicalMemory *memory;
protected:
- virtual bool recvTiming(Packet *pkt);
-
virtual Tick recvAtomic(Packet *pkt);
virtual void recvFunctional(Packet *pkt);
int numPorts;
- struct MemResponseEvent : public Event
- {
- Packet *pkt;
- MemoryPort *memoryPort;
-
- MemResponseEvent(Packet *pkt, MemoryPort *memoryPort);
- void process();
- const char *description();
- };
-
private:
// prevent copying of a MainMemory object
PhysicalMemory(const PhysicalMemory &specmem);
const PhysicalMemory &operator=(const PhysicalMemory &specmem);
protected:
- Addr base_addr;
- Addr pmem_size;
- uint8_t *pmem_addr;
+
+ class LockedAddr {
+ public:
+ // on alpha, minimum LL/SC granularity is 16 bytes, so lower
+ // bits need to masked off.
+ static const Addr Addr_Mask = 0xf;
+
+ static Addr mask(Addr paddr) { return (paddr & ~Addr_Mask); }
+
+ Addr addr; // locked address
+ int cpuNum; // locking CPU
+ int threadNum; // locking thread ID within CPU
+
+ // check for matching execution context
+ bool matchesContext(Request *req)
+ {
+ return (cpuNum == req->getCpuNum() &&
+ threadNum == req->getThreadNum());
+ }
+
+ LockedAddr(Request *req)
+ : addr(mask(req->getPaddr())),
+ cpuNum(req->getCpuNum()),
+ threadNum(req->getThreadNum())
+ {
+ }
+ };
+
+ std::list<LockedAddr> lockedAddrList;
+
+ // helper function for checkLockedAddrs(): we really want to
+ // inline a quick check for an empty locked addr list (hopefully
+ // the common case), and do the full list search (if necessary) in
+ // this out-of-line function
+ bool checkLockedAddrList(Request *req);
+
+ // Record the address of a load-locked operation so that we can
+ // clear the execution context's lock flag if a matching store is
+ // performed
+ void trackLoadLocked(Request *req);
+
+ // Compare a store address with any locked addresses so we can
+ // clear the lock flag appropriately. Return value set to 'false'
+ // if store operation should be suppressed (because it was a
+ // conditional store and the address was no longer locked by the
+ // requesting execution context), 'true' otherwise. Note that
+ // this method must be called on *all* stores since even
+ // non-conditional stores must clear any matching lock addresses.
+ bool writeOK(Request *req) {
+ if (lockedAddrList.empty()) {
+ // no locked addrs: nothing to check, store_conditional fails
+ bool isLocked = req->isLocked();
+ if (isLocked) {
+ req->setScResult(0);
+ }
+ return !isLocked; // only do write if not an sc
+ } else {
+ // iterate over list...
+ return checkLockedAddrList(req);
+ }
+ }
+
+ uint8_t *pmemAddr;
MemoryPort *port;
- int page_ptr;
+ int pagePtr;
Tick lat;
public:
Addr new_page();
- uint64_t size() { return pmem_size; }
+ uint64_t size() { return params()->addrRange.size(); }
+
+ struct Params
+ {
+ std::string name;
+ Range<Addr> addrRange;
+ Tick latency;
+ };
+
+ protected:
+ Params *_params;
public:
- PhysicalMemory(const std::string &n, Tick latency);
+ const Params *params() const { return _params; }
+ PhysicalMemory(Params *p);
virtual ~PhysicalMemory();
public:
int deviceBlockSize();
void getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop);
- virtual Port *getPort(const std::string &if_name);
+ virtual Port *getPort(const std::string &if_name, int idx = -1);
void virtual init();
+ unsigned int drain(Event *de);
- // fast back-door memory access for vtophys(), remote gdb, etc.
- // uint64_t phys_read_qword(Addr addr) const;
- private:
- bool doTimingAccess(Packet *pkt, MemoryPort *memoryPort);
- Tick doAtomicAccess(Packet *pkt);
+ protected:
void doFunctionalAccess(Packet *pkt);
-
+ virtual Tick calculateLatency(Packet *pkt);
void recvStatusChange(Port::Status status);
public: