diff options
author | Steve Reinhardt <stever@gmail.com> | 2008-02-26 20:17:26 -0800 |
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committer | Steve Reinhardt <stever@gmail.com> | 2008-02-26 20:17:26 -0800 |
commit | bdf33239151c7fcc194f6f9b8c62eb313c933755 (patch) | |
tree | 813955010ce9920d1f550133c5a19216b066a745 /src/mem/cache/cache.hh | |
parent | 8c0baf2ce478b16d351feb1f0ce147049f3a04f6 (diff) | |
download | gem5-bdf33239151c7fcc194f6f9b8c62eb313c933755.tar.xz |
Cache: better comments particularly regarding writeback situation.
--HG--
extra : convert_revision : 59ff9ee63ee0fec5a7dfc27b485b737455ccf362
Diffstat (limited to 'src/mem/cache/cache.hh')
-rw-r--r-- | src/mem/cache/cache.hh | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/src/mem/cache/cache.hh b/src/mem/cache/cache.hh index 6f5428c13..f5f65d4dd 100644 --- a/src/mem/cache/cache.hh +++ b/src/mem/cache/cache.hh @@ -270,12 +270,32 @@ class Cache : public BaseCache void squash(int threadNum); /** - * Selects a outstanding request to service. - * @return The request to service, NULL if none found. + * Generate an appropriate downstream bus request packet for the + * given parameters. + * @param cpu_pkt The upstream request that needs to be satisfied. + * @param blk The block currently in the cache corresponding to + * cpu_pkt (NULL if none). + * @param needsExclusive Indicates that an exclusive copy is required + * even if the request in cpu_pkt doesn't indicate that. + * @return A new Packet containing the request, or NULL if the + * current request in cpu_pkt should just be forwarded on. */ PacketPtr getBusPacket(PacketPtr cpu_pkt, BlkType *blk, bool needsExclusive); + + /** + * Return the next MSHR to service, either a pending miss from the + * mshrQueue, a buffered write from the write buffer, or something + * from the prefetcher. This function is responsible for + * prioritizing among those sources on the fly. + */ MSHR *getNextMSHR(); + + /** + * Selects an outstanding request to service. Called when the + * cache gets granted the downstream bus in timing mode. + * @return The request to service, NULL if none found. + */ PacketPtr getTimingPacket(); /** |