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authorDerek Hower <drh5@cs.wisc.edu>2010-01-19 17:11:36 -0600
committerDerek Hower <drh5@cs.wisc.edu>2010-01-19 17:11:36 -0600
commit07ea0891f1699f6194a05516948ce3824fb8fb38 (patch)
treeb5c22e3fe49a7e0d277fdb9ac5ee87c2aa0321e5 /tests/quick/50.memtest
parent279f179babc9e5663156777c533c06edc91bce9a (diff)
downloadgem5-07ea0891f1699f6194a05516948ce3824fb8fb38.tar.xz
ruby: new atomics implementation
This patch changes the way that Ruby handles atomic RMW instructions. This implementation, unlike the prior one, is protocol independent. It works by locking an address from the sequencer immediately after the read portion of an RMW completes. When that address is locked, the coherence controller will only satisfy requests coming from one port (e.g., the mandatory queue) and will ignore all others. After the write portion completed, the line is unlocked. This should also work with multi-line atomics, as long as the blocks are always acquired in the same order.
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