dp-arm bfef610667 Perform a cache flush after ENTER PSCI timestamp capture ... Without an explicit cache flush, the next timestamp captured might have a bogus value. This can happen if the following operations happen in order, on a CPU that's being powered down. 1) ENTER PSCI timestamp is captured with caches enabled. 2) The next timestamp (ENTER_HW_LOW_PWR) is captured with caches disabled. 3) On a system that uses a write-back cache configuration, the cache line that holds the PMF timestamps is evicted. After step 1), the ENTER_PSCI timestamp is cached and not in main memory. After step 2), the ENTER_HW_LOW_PWR timestamp is stored in main memory. Before the CPU power down happens, the hardware evicts the cache line that contains the PMF timestamps for this service. As a result, the timestamp captured in step 2) is overwritten with a bogus value. Change-Id: Ic1bd816498d1a6d4dc16540208ed3a5efe43f529 Signed-off-by: dp-arm <dimitris.papastamos@arm.com>		2016-11-03 16:02:53 +00:00
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std_svc_setup.c	Perform a cache flush after ENTER PSCI timestamp capture	2016-11-03 16:02:53 +00:00