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-rw-r--r--src/cpu/simple/atomic.cc19
-rw-r--r--src/cpu/simple/atomic.hh2
-rw-r--r--src/cpu/simple/base.cc20
-rw-r--r--src/cpu/simple/base.hh2
-rw-r--r--src/cpu/simple/timing.cc2
-rw-r--r--src/dev/alpha_console.cc3
-rw-r--r--src/dev/ide_ctrl.cc3
-rw-r--r--src/dev/io_device.cc4
-rw-r--r--src/dev/isa_fake.cc3
-rw-r--r--src/dev/ns_gige.cc3
-rw-r--r--src/dev/pciconfigall.cc3
-rw-r--r--src/dev/sinic.cc3
-rw-r--r--src/dev/tsunami_cchip.cc4
-rw-r--r--src/dev/tsunami_io.cc3
-rw-r--r--src/dev/tsunami_pchip.cc4
-rw-r--r--src/dev/uart8250.cc2
-rw-r--r--src/mem/packet.cc14
-rw-r--r--src/mem/packet.hh156
-rw-r--r--src/mem/physical.cc3
-rw-r--r--src/mem/port.hh9
20 files changed, 121 insertions, 141 deletions
diff --git a/src/cpu/simple/atomic.cc b/src/cpu/simple/atomic.cc
index a0d26a8ab..c2e6f6185 100644
--- a/src/cpu/simple/atomic.cc
+++ b/src/cpu/simple/atomic.cc
@@ -250,10 +250,9 @@ AtomicSimpleCPU::read(Addr addr, T &data, unsigned flags)
// Now do the access.
if (fault == NoFault) {
- data_read_pkt->reset();
data_read_pkt->reinitFromRequest();
- dcache_complete = dcachePort.sendAtomic(data_read_pkt);
+ dcache_latency = dcachePort.sendAtomic(data_read_pkt);
dcache_access = true;
assert(data_read_pkt->result == Packet::Success);
@@ -329,12 +328,11 @@ AtomicSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
// Now do the access.
if (fault == NoFault) {
- data_write_pkt->reset();
data = htog(data);
- data_write_pkt->dataStatic(&data);
data_write_pkt->reinitFromRequest();
+ data_write_pkt->dataStatic(&data);
- dcache_complete = dcachePort.sendAtomic(data_write_pkt);
+ dcache_latency = dcachePort.sendAtomic(data_write_pkt);
dcache_access = true;
assert(data_write_pkt->result == Packet::Success);
@@ -411,11 +409,12 @@ AtomicSimpleCPU::tick()
checkForInterrupts();
ifetch_req->resetMin();
- ifetch_pkt->reset();
- Fault fault = setupFetchPacket(ifetch_pkt);
+ Fault fault = setupFetchRequest(ifetch_req);
if (fault == NoFault) {
- Tick icache_complete = icachePort.sendAtomic(ifetch_pkt);
+ ifetch_pkt->reinitFromRequest();
+
+ Tick icache_latency = icachePort.sendAtomic(ifetch_pkt);
// ifetch_req is initialized to read the instruction directly
// into the CPU object's inst field.
@@ -430,9 +429,9 @@ AtomicSimpleCPU::tick()
// cycle time. If not, the next tick event may get
// scheduled at a non-integer multiple of the CPU
// cycle time.
- Tick icache_stall = icache_complete - curTick - cycles(1);
+ Tick icache_stall = icache_latency - cycles(1);
Tick dcache_stall =
- dcache_access ? dcache_complete - curTick - cycles(1) : 0;
+ dcache_access ? dcache_latency - cycles(1) : 0;
latency += icache_stall + dcache_stall;
}
diff --git a/src/cpu/simple/atomic.hh b/src/cpu/simple/atomic.hh
index 65269bd6d..8c76fbdc8 100644
--- a/src/cpu/simple/atomic.hh
+++ b/src/cpu/simple/atomic.hh
@@ -116,7 +116,7 @@ class AtomicSimpleCPU : public BaseSimpleCPU
Packet *data_write_pkt;
bool dcache_access;
- Tick dcache_complete;
+ Tick dcache_latency;
public:
diff --git a/src/cpu/simple/base.cc b/src/cpu/simple/base.cc
index 18f170449..2e9b4b81f 100644
--- a/src/cpu/simple/base.cc
+++ b/src/cpu/simple/base.cc
@@ -351,29 +351,21 @@ BaseSimpleCPU::checkForInterrupts()
Fault
-BaseSimpleCPU::setupFetchPacket(Packet *ifetch_pkt)
+BaseSimpleCPU::setupFetchRequest(Request *req)
{
- // Try to fetch an instruction
-
// set up memory request for instruction fetch
-
DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",cpuXC->readPC(),
cpuXC->readNextPC(),cpuXC->readNextNPC());
- Request *ifetch_req = ifetch_pkt->req;
- ifetch_req->setVaddr(cpuXC->readPC() & ~3);
- ifetch_req->setTime(curTick);
+ req->setVaddr(cpuXC->readPC() & ~3);
+ req->setTime(curTick);
#if FULL_SYSTEM
- ifetch_req->setFlags((cpuXC->readPC() & 1) ? PHYSICAL : 0);
+ req->setFlags((cpuXC->readPC() & 1) ? PHYSICAL : 0);
#else
- ifetch_req->setFlags(0);
+ req->setFlags(0);
#endif
- Fault fault = cpuXC->translateInstReq(ifetch_req);
-
- if (fault == NoFault) {
- ifetch_pkt->reinitFromRequest();
- }
+ Fault fault = cpuXC->translateInstReq(req);
return fault;
}
diff --git a/src/cpu/simple/base.hh b/src/cpu/simple/base.hh
index 4c0e6f3c7..dbeb6afce 100644
--- a/src/cpu/simple/base.hh
+++ b/src/cpu/simple/base.hh
@@ -129,7 +129,7 @@ class BaseSimpleCPU : public BaseCPU
StaticInstPtr curStaticInst;
void checkForInterrupts();
- Fault setupFetchPacket(Packet *ifetch_pkt);
+ Fault setupFetchRequest(Request *req);
void preExecute();
void postExecute();
void advancePC(Fault fault);
diff --git a/src/cpu/simple/timing.cc b/src/cpu/simple/timing.cc
index 5f094d033..ed0c2da94 100644
--- a/src/cpu/simple/timing.cc
+++ b/src/cpu/simple/timing.cc
@@ -342,11 +342,11 @@ TimingSimpleCPU::fetch()
Request *ifetch_req = new Request(true);
ifetch_req->setSize(sizeof(MachInst));
+ Fault fault = setupFetchRequest(ifetch_req);
ifetch_pkt = new Packet(ifetch_req, Packet::ReadReq, Packet::Broadcast);
ifetch_pkt->dataStatic(&inst);
- Fault fault = setupFetchPacket(ifetch_pkt);
if (fault == NoFault) {
if (!icachePort.sendTiming(ifetch_pkt)) {
// Need to wait for retry
diff --git a/src/dev/alpha_console.cc b/src/dev/alpha_console.cc
index 0b4bb048c..c5b105fc7 100644
--- a/src/dev/alpha_console.cc
+++ b/src/dev/alpha_console.cc
@@ -98,7 +98,6 @@ AlphaConsole::read(Packet *pkt)
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
- pkt->time += pioDelay;
Addr daddr = pkt->getAddr() - pioAddr;
pkt->allocate();
@@ -191,8 +190,6 @@ AlphaConsole::read(Packet *pkt)
Tick
AlphaConsole::write(Packet *pkt)
{
- pkt->time += pioDelay;
-
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
Addr daddr = pkt->getAddr() - pioAddr;
diff --git a/src/dev/ide_ctrl.cc b/src/dev/ide_ctrl.cc
index eb03d5db8..d8dff0870 100644
--- a/src/dev/ide_ctrl.cc
+++ b/src/dev/ide_ctrl.cc
@@ -430,7 +430,6 @@ IdeController::read(Packet *pkt)
IdeRegType reg_type;
int disk;
- pkt->time += pioDelay;
pkt->allocate();
if (pkt->getSize() != 1 && pkt->getSize() != 2 && pkt->getSize() !=4)
panic("Bad IDE read size: %d\n", pkt->getSize());
@@ -518,8 +517,6 @@ IdeController::write(Packet *pkt)
int disk;
uint8_t oldVal, newVal;
- pkt->time += pioDelay;
-
parseAddr(pkt->getAddr(), offset, channel, reg_type);
if (!io_enabled) {
diff --git a/src/dev/io_device.cc b/src/dev/io_device.cc
index 563fdb759..0a8379095 100644
--- a/src/dev/io_device.cc
+++ b/src/dev/io_device.cc
@@ -80,10 +80,10 @@ PioPort::SendEvent::process()
bool
PioPort::recvTiming(Packet *pkt)
{
- device->recvAtomic(pkt);
+ Tick latency = device->recvAtomic(pkt);
// turn packet around to go back to requester
pkt->makeTimingResponse();
- sendTiming(pkt, pkt->time - pkt->req->getTime());
+ sendTiming(pkt, latency);
return true;
}
diff --git a/src/dev/isa_fake.cc b/src/dev/isa_fake.cc
index c303ffc30..c00ee0adb 100644
--- a/src/dev/isa_fake.cc
+++ b/src/dev/isa_fake.cc
@@ -54,8 +54,6 @@ IsaFake::read(Packet *pkt)
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
- pkt->time += pioDelay;
-
DPRINTF(Tsunami, "read va=%#x size=%d\n", pkt->getAddr(), pkt->getSize());
switch (pkt->getSize()) {
@@ -80,7 +78,6 @@ IsaFake::read(Packet *pkt)
Tick
IsaFake::write(Packet *pkt)
{
- pkt->time += pioDelay;
DPRINTF(Tsunami, "write - va=%#x size=%d \n", pkt->getAddr(), pkt->getSize());
pkt->result = Packet::Success;
return pioDelay;
diff --git a/src/dev/ns_gige.cc b/src/dev/ns_gige.cc
index 963675847..719747b26 100644
--- a/src/dev/ns_gige.cc
+++ b/src/dev/ns_gige.cc
@@ -492,7 +492,6 @@ NSGigE::read(Packet *pkt)
{
assert(ioEnable);
- pkt->time += pioDelay;
pkt->allocate();
//The mask is to give you only the offset into the device register file
@@ -728,8 +727,6 @@ NSGigE::write(Packet *pkt)
DPRINTF(EthernetPIO, "write da=%#x pa=%#x size=%d\n",
daddr, pkt->getAddr(), pkt->getSize());
- pkt->time += pioDelay;
-
if (daddr > LAST && daddr <= RESERVED) {
panic("Accessing reserved register");
} else if (daddr > RESERVED && daddr <= 0x3FC) {
diff --git a/src/dev/pciconfigall.cc b/src/dev/pciconfigall.cc
index 14a28e86d..9b679ed95 100644
--- a/src/dev/pciconfigall.cc
+++ b/src/dev/pciconfigall.cc
@@ -99,7 +99,6 @@ PciConfigAll::read(Packet *pkt)
int func = (daddr >> 8) & 0x7;
int reg = daddr & 0xFF;
- pkt->time += pioDelay;
pkt->allocate();
DPRINTF(PciConfigAll, "read va=%#x da=%#x size=%d\n", pkt->getAddr(), daddr,
@@ -134,8 +133,6 @@ PciConfigAll::read(Packet *pkt)
Tick
PciConfigAll::write(Packet *pkt)
{
- pkt->time += pioDelay;
-
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
assert(pkt->getSize() == sizeof(uint8_t) || pkt->getSize() == sizeof(uint16_t) ||
diff --git a/src/dev/sinic.cc b/src/dev/sinic.cc
index 31fbc49aa..529024a90 100644
--- a/src/dev/sinic.cc
+++ b/src/dev/sinic.cc
@@ -322,7 +322,6 @@ Device::read(Packet *pkt)
Addr index = daddr >> Regs::VirtualShift;
Addr raddr = daddr & Regs::VirtualMask;
- pkt->time += pioDelay;
pkt->allocate();
if (!regValid(raddr))
@@ -410,8 +409,6 @@ Device::write(Packet *pkt)
Addr index = daddr >> Regs::VirtualShift;
Addr raddr = daddr & Regs::VirtualMask;
- pkt->time += pioDelay;
-
if (!regValid(raddr))
panic("invalid register: cpu=%d, da=%#x pa=%#x size=%d",
cpu, daddr, pkt->getAddr(), pkt->getSize());
diff --git a/src/dev/tsunami_cchip.cc b/src/dev/tsunami_cchip.cc
index 146321b9f..e5ef18448 100644
--- a/src/dev/tsunami_cchip.cc
+++ b/src/dev/tsunami_cchip.cc
@@ -76,7 +76,6 @@ TsunamiCChip::read(Packet *pkt)
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
- pkt->time += pioDelay;
Addr regnum = (pkt->getAddr() - pioAddr) >> 6;
Addr daddr = (pkt->getAddr() - pioAddr);
@@ -182,9 +181,6 @@ TsunamiCChip::read(Packet *pkt)
Tick
TsunamiCChip::write(Packet *pkt)
{
- pkt->time += pioDelay;
-
-
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
Addr daddr = pkt->getAddr() - pioAddr;
Addr regnum = (pkt->getAddr() - pioAddr) >> 6 ;
diff --git a/src/dev/tsunami_io.cc b/src/dev/tsunami_io.cc
index 729a61cf7..8eaf7679f 100644
--- a/src/dev/tsunami_io.cc
+++ b/src/dev/tsunami_io.cc
@@ -447,7 +447,6 @@ TsunamiIO::read(Packet *pkt)
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
- pkt->time += pioDelay;
Addr daddr = pkt->getAddr() - pioAddr;
DPRINTF(Tsunami, "io read va=%#x size=%d IOPorrt=%#x\n", pkt->getAddr(),
@@ -511,8 +510,6 @@ TsunamiIO::read(Packet *pkt)
Tick
TsunamiIO::write(Packet *pkt)
{
- pkt->time += pioDelay;
-
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
Addr daddr = pkt->getAddr() - pioAddr;
diff --git a/src/dev/tsunami_pchip.cc b/src/dev/tsunami_pchip.cc
index c430ca0a0..5252ccea6 100644
--- a/src/dev/tsunami_pchip.cc
+++ b/src/dev/tsunami_pchip.cc
@@ -70,8 +70,6 @@ TsunamiPChip::read(Packet *pkt)
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
-
- pkt->time += pioDelay;
pkt->allocate();
Addr daddr = (pkt->getAddr() - pioAddr) >> 6;;
assert(pkt->getSize() == sizeof(uint64_t));
@@ -151,8 +149,6 @@ TsunamiPChip::read(Packet *pkt)
Tick
TsunamiPChip::write(Packet *pkt)
{
- pkt->time += pioDelay;
-
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
Addr daddr = (pkt->getAddr() - pioAddr) >> 6;
diff --git a/src/dev/uart8250.cc b/src/dev/uart8250.cc
index 8a5a1f1cd..9aae6a75b 100644
--- a/src/dev/uart8250.cc
+++ b/src/dev/uart8250.cc
@@ -114,7 +114,6 @@ Uart8250::read(Packet *pkt)
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
assert(pkt->getSize() == 1);
- pkt->time += pioDelay;
Addr daddr = pkt->getAddr() - pioAddr;
pkt->allocate();
@@ -198,7 +197,6 @@ Uart8250::write(Packet *pkt)
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
assert(pkt->getSize() == 1);
- pkt->time += pioDelay;
Addr daddr = pkt->getAddr() - pioAddr;
DPRINTF(Uart, " write register %#x value %#x\n", daddr, pkt->get<uint8_t>());
diff --git a/src/mem/packet.cc b/src/mem/packet.cc
index 3b415d77f..4cda657f5 100644
--- a/src/mem/packet.cc
+++ b/src/mem/packet.cc
@@ -97,20 +97,6 @@ Packet::intersect(Packet *p)
return false;
}
-/** Minimally reset a packet so something like simple cpu can reuse it. */
-void
-Packet::reset()
-{
- result = Unknown;
- if (dynamicData) {
- deleteData();
- dynamicData = false;
- arrayData = false;
- time = curTick;
- }
-}
-
-
bool
fixPacket(Packet *func, Packet *timing)
{
diff --git a/src/mem/packet.hh b/src/mem/packet.hh
index 83f52ede5..e09ef4b85 100644
--- a/src/mem/packet.hh
+++ b/src/mem/packet.hh
@@ -28,8 +28,7 @@
/**
* @file
- * Declaration of the Packet Class, a packet is a transaction occuring
- * between a single level of the memory heirarchy (ie L1->L2).
+ * Declaration of the Packet class.
*/
#ifndef __MEM_PACKET_HH__
@@ -44,81 +43,98 @@ typedef Packet* PacketPtr;
typedef uint8_t* PacketDataPtr;
/**
- * A Packet is the structure to handle requests between two levels
- * of the memory system. The Request is a global object that trancends
- * all of the memory heirarchy, but at each levels interface a packet
- * is created to transfer data/requests. For example, a request would
- * be used to initiate a request to go to memory/IOdevices, as the request
- * passes through the memory system several packets will be created. One
- * will be created to go between the L1 and L2 caches and another to go to
- * the next level and so forth.
- *
- * Packets are assumed to be returned in the case of a single response. If
- * the transaction has no response, then the consumer will delete the packet.
+ * A Packet is used to encapsulate a transfer between two objects in
+ * the memory system (e.g., the L1 and L2 cache). (In contrast, a
+ * single Request travels all the way from the requester to the
+ * ultimate destination and back, possibly being conveyed by several
+ * different Packets along the way.)
*/
class Packet
{
private:
- /** A pointer to the data being transfered. It can be differnt sizes
- at each level of the heirarchy so it belongs in the packet,
- not request. This may or may not be populated when a responder recieves
- the packet. If not populated it memory should be allocated.
+ /** A pointer to the data being transfered. It can be differnt
+ * sizes at each level of the heirarchy so it belongs in the
+ * packet, not request. This may or may not be populated when a
+ * responder recieves the packet. If not populated it memory
+ * should be allocated.
*/
PacketDataPtr data;
- /** Is the data pointer set to a value that shouldn't be freed when the
- * packet is destroyed? */
+ /** Is the data pointer set to a value that shouldn't be freed
+ * when the packet is destroyed? */
bool staticData;
- /** The data pointer points to a value that should be freed when the packet
- * is destroyed. */
+ /** The data pointer points to a value that should be freed when
+ * the packet is destroyed. */
bool dynamicData;
- /** the data pointer points to an array (thus delete [] ) needs to be called
- * on it rather than simply delete.*/
+ /** the data pointer points to an array (thus delete [] ) needs to
+ * be called on it rather than simply delete.*/
bool arrayData;
- /** The address of the request, could be virtual or physical (depending on
- cache configurations). */
+ /** The address of the request. This address could be virtual or
+ * physical, depending on the system configuration. */
Addr addr;
- /** Indicates the size of the request. */
+ /** The size of the request or transfer. */
int size;
- /** A index of the source of the transaction. */
+ /** Device address (e.g., bus ID) of the source of the
+ * transaction. The source is not responsible for setting this
+ * field; it is set implicitly by the interconnect when the
+ * packet * is first sent. */
short src;
- /** A index to the destination of the transaction. */
+ /** Device address (e.g., bus ID) of the destination of the
+ * transaction. The special value Broadcast indicates that the
+ * packet should be routed based on its address. This field is
+ * initialized in the constructor and is thus always valid
+ * (unlike * addr, size, and src). */
short dest;
+ /** Is the 'addr' field valid? */
bool addrValid;
+ /** Is the 'size' field valid? */
bool sizeValid;
+ /** Is the 'src' field valid? */
bool srcValid;
public:
+ /** The special destination address indicating that the packet
+ * should be routed based on its address. */
static const short Broadcast = -1;
- /** A pointer to the overall request. */
+ /** A pointer to the original request. */
RequestPtr req;
+ /** A virtual base opaque structure used to hold coherence-related
+ * state. A specific subclass would be derived from this to
+ * carry state specific to a particular coherence protocol. */
class CoherenceState {
public:
virtual ~CoherenceState() {}
};
- /** A virtual base opaque structure used to hold
- coherence status messages. */
- CoherenceState *coherence; // virtual base opaque,
- // assert(dynamic_cast<Foo>) etc.
-
+ /** This packet's coherence state. Caches should use
+ * dynamic_cast<> to cast to the state appropriate for the
+ * system's coherence protocol. */
+ CoherenceState *coherence;
+
+ /** A virtual base opaque structure used to hold state associated
+ * with the packet but specific to the sending device (e.g., an
+ * MSHR). A pointer to this state is returned in the packet's
+ * response so that the sender can quickly look up the state
+ * needed to process it. A specific subclass would be derived
+ * from this to carry state specific to a particular sending
+ * device. */
class SenderState {
public:
virtual ~SenderState() {}
};
- /** A virtual base opaque structure used to hold the senders state. */
- SenderState *senderState; // virtual base opaque,
- // assert(dynamic_cast<Foo>) etc.
+ /** This packet's sender state. Devices should use dynamic_cast<>
+ * to cast to the state appropriate to the sender. */
+ SenderState *senderState;
private:
/** List of command attributes. */
@@ -144,9 +160,11 @@ class Packet
WriteResp = IsWrite | IsResponse
};
+ /** Return the string name of the cmd field (for debugging and
+ * tracing). */
const std::string &cmdString() const;
- /** The command of the transaction. */
+ /** The command field of the packet. */
Command cmd;
bool isRead() { return (cmd & IsRead) != 0; }
@@ -154,20 +172,7 @@ class Packet
bool isResponse() { return (cmd & IsResponse) != 0; }
bool needsResponse() { return (cmd & NeedsResponse) != 0; }
- void makeTimingResponse() {
- assert(needsResponse());
- int icmd = (int)cmd;
- icmd &= ~(IsRequest | NeedsResponse);
- icmd |= IsResponse;
- cmd = (Command)icmd;
- dest = src;
- srcValid = false;
- }
-
- /** The time this request was responded to. Used to calculate latencies. */
- Tick time;
-
- /** The result of a particular packets request. */
+ /** Possible results of a packet's request. */
enum Result
{
Success,
@@ -175,7 +180,7 @@ class Packet
Unknown
};
- /** The result of the packet transaction. */
+ /** The result of this packet's request. */
Result result;
/** Accessor function that returns the source index of the packet. */
@@ -193,27 +198,56 @@ class Packet
int getSize() const { assert(sizeValid); return size; }
void setSize(int _size) { size = _size; sizeValid = true; }
-
+ /** Constructor. Note that a Request object must be constructed
+ * first, but the Requests's physical address and size fields
+ * need not be valid. The command and destination addresses
+ * must be supplied. */
Packet(Request *_req, Command _cmd, short _dest)
: data(NULL), staticData(false), dynamicData(false), arrayData(false),
addr(_req->paddr), size(_req->size), dest(_dest),
addrValid(_req->validPaddr), sizeValid(_req->validSize),
srcValid(false),
req(_req), coherence(NULL), senderState(NULL), cmd(_cmd),
- time(curTick), result(Unknown)
+ result(Unknown)
{
}
+ /** Destructor. */
~Packet()
{ deleteData(); }
-
- /** Minimally reset a packet so something like simple cpu can reuse it. */
- void reset();
-
+ /** Reinitialize packet address and size from the associated
+ * Request object, and reset other fields that may have been
+ * modified by a previous transaction. Typically called when a
+ * statically allocated Request/Packet pair is reused for
+ * multiple transactions. */
void reinitFromRequest() {
- if (req->validPaddr) setAddr(req->paddr);
- if (req->validSize) setSize(req->size);
+ assert(req->validPaddr);
+ setAddr(req->paddr);
+ assert(req->validSize);
+ setSize(req->size);
+ result = Unknown;
+ if (dynamicData) {
+ deleteData();
+ dynamicData = false;
+ arrayData = false;
+ }
+ }
+
+ /** Take a request packet and modify it in place to be suitable
+ * for returning as a response to that request. Used for timing
+ * accesses only. For atomic and functional accesses, the
+ * request packet is always implicitly passed back *without*
+ * modifying the command or destination fields, so this function
+ * should not be called. */
+ void makeTimingResponse() {
+ assert(needsResponse());
+ int icmd = (int)cmd;
+ icmd &= ~(IsRequest | NeedsResponse);
+ icmd |= IsResponse;
+ cmd = (Command)icmd;
+ dest = src;
+ srcValid = false;
}
/** Set the data pointer to the following value that should not be freed. */
diff --git a/src/mem/physical.cc b/src/mem/physical.cc
index 26dbef0cd..fa7eb803e 100644
--- a/src/mem/physical.cc
+++ b/src/mem/physical.cc
@@ -139,8 +139,7 @@ Tick
PhysicalMemory::doAtomicAccess(Packet *pkt)
{
doFunctionalAccess(pkt);
- pkt->time = curTick + lat;
- return curTick + lat;
+ return lat;
}
void
diff --git a/src/mem/port.hh b/src/mem/port.hh
index d0fa5ae8d..80ae035b1 100644
--- a/src/mem/port.hh
+++ b/src/mem/port.hh
@@ -165,10 +165,11 @@ class Port
*/
bool sendTiming(Packet *pkt) { return peer->recvTiming(pkt); }
- /** Function called by the associated device to send an atomic access,
- an access in which the data is moved and the state is updated in one
- cycle, without interleaving with other memory accesses.
- */
+ /** Function called by the associated device to send an atomic
+ * access, an access in which the data is moved and the state is
+ * updated in one cycle, without interleaving with other memory
+ * accesses. Returns estimated latency of access.
+ */
Tick sendAtomic(Packet *pkt)
{ return peer->recvAtomic(pkt); }
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-06 18:56:29 +0000