diff options
Diffstat (limited to 'src/mem/protocol/MESI_Three_Level-msg.sm')
| -rw-r--r-- | src/mem/protocol/MESI_Three_Level-msg.sm | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/mem/protocol/MESI_Three_Level-msg.sm b/src/mem/protocol/MESI_Three_Level-msg.sm index 7fe4add46..2a5ecc8e8 100644 --- a/src/mem/protocol/MESI_Three_Level-msg.sm +++ b/src/mem/protocol/MESI_Three_Level-msg.sm @@ -46,6 +46,11 @@ enumeration(CoherenceClass, desc="...") { DATA, desc="Data block for L1 cache in S state"; DATA_EXCLUSIVE, desc="Data block for L1 cache in M/E state"; ACK, desc="Generic invalidate ack"; + + // This is a special case in which the L1 cache lost permissions to the + // shared block before it got the data. So the L0 cache can use the data + // but not store it. + STALE_DATA; } // Class for messages sent between the L0 and the L1 controllers. |