diff options
Diffstat (limited to 'src/mem/packet.cc')
| -rw-r--r-- | src/mem/packet.cc | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/mem/packet.cc b/src/mem/packet.cc index 68a5e6dc2..f584c204f 100644 --- a/src/mem/packet.cc +++ b/src/mem/packet.cc @@ -71,7 +71,8 @@ MemCmd::commandInfo[] = { /* InvalidCmd */ { 0, InvalidCmd, "InvalidCmd" }, - /* ReadReq */ + /* ReadReq - Read issued by a non-caching agent such as a CPU or + * device, with no restrictions on alignment. */ { SET3(IsRead, IsRequest, NeedsResponse), ReadResp, "ReadReq" }, /* ReadResp */ { SET3(IsRead, IsResponse, HasData), InvalidCmd, "ReadResp" }, @@ -125,12 +126,23 @@ MemCmd::commandInfo[] = * that it has failed, acquires line as Dirty*/ { SET4(IsRead, NeedsExclusive, IsResponse, HasData), InvalidCmd, "UpgradeFailResp" }, - /* ReadExReq */ + /* ReadExReq - Read issues by a cache, always cache-line aligned, + * and the response is guaranteed to be writeable (exclusive or + * even modified) */ { SET5(IsRead, NeedsExclusive, IsInvalidate, IsRequest, NeedsResponse), ReadExResp, "ReadExReq" }, - /* ReadExResp */ + /* ReadExResp - Response matching a read exclusive, as we check + * the need for exclusive also on responses */ { SET4(IsRead, NeedsExclusive, IsResponse, HasData), InvalidCmd, "ReadExResp" }, + /* ReadCleanReq - Read issued by a cache, always cache-line + * aligned, and the response is guaranteed to not contain dirty data + * (exclusive or shared).*/ + { SET3(IsRead, IsRequest, NeedsResponse), ReadResp, "ReadCleanReq" }, + /* ReadSharedReq - Read issued by a cache, always cache-line + * aligned, response is shared, possibly exclusive, owned or even + * modified. */ + { SET3(IsRead, IsRequest, NeedsResponse), ReadResp, "ReadSharedReq" }, /* LoadLockedReq: note that we use plain ReadResp as response, so that * we can also use ReadRespWithInvalidate when needed */ { SET4(IsRead, IsLlsc, IsRequest, NeedsResponse), |