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ruby, arm: Forward invalidations to the local exclusive monitor

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ARM systems require local exclusive monitors for the implementation of
synchronization primitives between processors. A ruby memory system
needs to forward invalidations to the local exclusive monitors to
to correctly determine their state.

Change-Id: I7bc4d0f2a5be0f4e36a25c87aa4a81a3f086fb3c
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/2904
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
This commit is contained in:
Nikos Nikoleris
2017-04-04 19:19:02 +01:00
parent 12db50c895
commit 42e114ddef
1 changed files with 3 additions and 1 deletions
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4
configs/ruby/Ruby.py
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@@ -231,6 +231,8 @@ def send_evicts(options):
# currently, 2 scenarios warrant forwarding evictions to the CPU: # currently, 2 scenarios warrant forwarding evictions to the CPU:
# 1. The O3 model must keep the LSQ coherent with the caches # 1. The O3 model must keep the LSQ coherent with the caches
# 2. The x86 mwait instruction is built on top of coherence invalidations # 2. The x86 mwait instruction is built on top of coherence invalidations
if options.cpu_type == "DerivO3CPU" or buildEnv['TARGET_ISA'] == 'x86': # 3. The local exclusive monitor in ARM systems
if options.cpu_type == "DerivO3CPU" or \
buildEnv['TARGET_ISA'] in ('x86', 'arm'):
return True return True
return False return False