summaryrefslogtreecommitdiff
path: root/src
diff options
context:
space:
mode:
Diffstat (limited to 'src')
-rw-r--r--src/mem/cache/cache.hh6
-rw-r--r--src/mem/cache/cache_impl.hh62
-rw-r--r--src/mem/cache/coherence/coherence_protocol.cc3
3 files changed, 65 insertions, 6 deletions
diff --git a/src/mem/cache/cache.hh b/src/mem/cache/cache.hh
index 722ce216b..3e45c85d2 100644
--- a/src/mem/cache/cache.hh
+++ b/src/mem/cache/cache.hh
@@ -227,6 +227,12 @@ class Cache : public BaseCache
BlkType* handleAccess(PacketPtr &pkt, int & lat,
PacketList & writebacks, bool update = true);
+
+ /**
+ *Handle doing the Compare and Swap function for SPARC.
+ */
+ void cmpAndSwap(BlkType *blk, PacketPtr &pkt);
+
/**
* Populates a cache block and handles all outstanding requests for the
* satisfied fill request. This version takes an MSHR pointer and uses its
diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh
index 5c6ab0950..9368e7648 100644
--- a/src/mem/cache/cache_impl.hh
+++ b/src/mem/cache/cache_impl.hh
@@ -122,12 +122,15 @@ Cache<TagStore,Coherence>::handleAccess(PacketPtr &pkt, int & lat,
if (blk != NULL) {
if (!update) {
+
if (pkt->isWrite()){
assert(offset < blkSize);
assert(pkt->getSize() <= blkSize);
assert(offset+pkt->getSize() <= blkSize);
std::memcpy(blk->data + offset, pkt->getPtr<uint8_t>(),
pkt->getSize());
+ } else if (pkt->isReadWrite()) {
+ cmpAndSwap(blk, pkt);
} else if (!(pkt->flags & SATISFIED)) {
pkt->flags |= SATISFIED;
pkt->result = Packet::Success;
@@ -154,7 +157,8 @@ Cache<TagStore,Coherence>::handleAccess(PacketPtr &pkt, int & lat,
}
}
- if ((pkt->isWrite() && blk->isWritable()) ||
+ if ((pkt->isReadWrite() && blk->isWritable()) ||
+ (pkt->isWrite() && blk->isWritable()) ||
(pkt->isRead() && blk->isValid())) {
// We are satisfying the request
@@ -180,13 +184,15 @@ Cache<TagStore,Coherence>::handleAccess(PacketPtr &pkt, int & lat,
std::memcpy(blk->data + offset, pkt->getPtr<uint8_t>(),
pkt->getSize());
}
+ } else if (pkt->isReadWrite()) {
+ cmpAndSwap(blk, pkt);
} else {
assert(pkt->isRead());
if (pkt->req->isLocked()) {
blk->trackLoadLocked(pkt->req);
}
std::memcpy(pkt->getPtr<uint8_t>(), blk->data + offset,
- pkt->getSize());
+ pkt->getSize());
}
if (write_data ||
@@ -215,6 +221,44 @@ Cache<TagStore,Coherence>::handleAccess(PacketPtr &pkt, int & lat,
}
template<class TagStore, class Coherence>
+void
+Cache<TagStore,Coherence>::cmpAndSwap(BlkType *blk, PacketPtr &pkt){
+ uint64_t overwrite_val;
+ bool overwrite_mem;
+ uint64_t condition_val64;
+ uint32_t condition_val32;
+
+ int offset = tags->extractBlkOffset(pkt->getAddr());
+
+ assert(sizeof(uint64_t) >= pkt->getSize());
+
+ overwrite_mem = true;
+ // keep a copy of our possible write value, and copy what is at the
+ // memory address into the packet
+ std::memcpy(&overwrite_val, pkt->getPtr<uint8_t>(), pkt->getSize());
+ std::memcpy(pkt->getPtr<uint8_t>(), blk->data + offset,
+ pkt->getSize());
+
+ if (pkt->req->isCondSwap()) {
+ if (pkt->getSize() == sizeof(uint64_t)) {
+ condition_val64 = pkt->req->getExtraData();
+ overwrite_mem = !std::memcmp(&condition_val64, blk->data + offset,
+ sizeof(uint64_t));
+ } else if (pkt->getSize() == sizeof(uint32_t)) {
+ condition_val32 = (uint32_t)pkt->req->getExtraData();
+ overwrite_mem = !std::memcmp(&condition_val32, blk->data + offset,
+ sizeof(uint32_t));
+ } else
+ panic("Invalid size for conditional read/write\n");
+ }
+
+ if (overwrite_mem)
+ std::memcpy(blk->data + offset,
+ &overwrite_val, pkt->getSize());
+
+}
+
+template<class TagStore, class Coherence>
typename Cache<TagStore,Coherence>::BlkType*
Cache<TagStore,Coherence>::handleFill(BlkType *blk, PacketPtr &pkt,
CacheBlk::State new_state,
@@ -244,8 +288,9 @@ Cache<TagStore,Coherence>::handleFill(BlkType *blk, PacketPtr &pkt,
blk = NULL;
}
- if (blk && (target->isWrite() ? blk->isWritable() : blk->isValid())) {
- assert(target->isWrite() || target->isRead());
+ if (blk && ((target->isWrite() || target->isReadWrite()) ?
+ blk->isWritable() : blk->isValid())) {
+ assert(target->isWrite() || target->isReadWrite() || target->isRead());
assert(target->getOffset(blkSize) + target->getSize() <= blkSize);
if (target->isWrite()) {
if (blk->checkWrite(pkt->req)) {
@@ -253,6 +298,8 @@ Cache<TagStore,Coherence>::handleFill(BlkType *blk, PacketPtr &pkt,
std::memcpy(blk->data + target->getOffset(blkSize),
target->getPtr<uint8_t>(), target->getSize());
}
+ } else if (target->isReadWrite()) {
+ cmpAndSwap(blk, pkt);
} else {
if (pkt->req->isLocked()) {
blk->trackLoadLocked(pkt->req);
@@ -332,8 +379,9 @@ Cache<TagStore,Coherence>::handleFill(BlkType *blk, MSHR * mshr,
continue;
}
- if (blk && (target->isWrite() ? blk->isWritable() : blk->isValid())) {
- assert(target->isWrite() || target->isRead());
+ if (blk && ((target->isWrite() || target->isReadWrite()) ?
+ blk->isWritable() : blk->isValid())) {
+ assert(target->isWrite() || target->isRead() || target->isReadWrite() );
assert(target->getOffset(blkSize) + target->getSize() <= blkSize);
if (target->isWrite()) {
if (blk->checkWrite(pkt->req)) {
@@ -341,6 +389,8 @@ Cache<TagStore,Coherence>::handleFill(BlkType *blk, MSHR * mshr,
std::memcpy(blk->data + target->getOffset(blkSize),
target->getPtr<uint8_t>(), target->getSize());
}
+ } else if (target->isReadWrite()) {
+ cmpAndSwap(blk, pkt);
} else {
if (target->req->isLocked()) {
blk->trackLoadLocked(target->req);
diff --git a/src/mem/cache/coherence/coherence_protocol.cc b/src/mem/cache/coherence/coherence_protocol.cc
index e8520401d..33a8a4e63 100644
--- a/src/mem/cache/coherence/coherence_protocol.cc
+++ b/src/mem/cache/coherence/coherence_protocol.cc
@@ -295,9 +295,12 @@ CoherenceProtocol::CoherenceProtocol(const string &name,
tt[Invalid][MC::ReadReq].onRequest(MC::ReadReq);
// we only support write allocate right now
tt[Invalid][MC::WriteReq].onRequest(MC::ReadExReq);
+ tt[Invalid][MC::SwapReq].onRequest(MC::ReadExReq);
tt[Shared][MC::WriteReq].onRequest(writeToSharedCmd);
+ tt[Shared][MC::SwapReq].onRequest(writeToSharedCmd);
if (hasOwned) {
tt[Owned][MC::WriteReq].onRequest(writeToSharedCmd);
+ tt[Owned][MC::SwapReq].onRequest(writeToSharedCmd);
}
// Prefetching causes a read
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-23 10:38:01 +0000