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Implement support for the Activity Monitor Unit on Cortex A75
Dimitris Papastamos authored
The Cortex A75 has 5 AMU counters.  The first three counters are fixed
and the remaining two are programmable.

A new build option is introduced, `ENABLE_AMU`.  When set, the fixed
counters will be enabled for use by lower ELs.  The programmable
counters are currently disabled.

Change-Id: I4bd5208799bb9ed7d2596e8b0bfc87abbbe18740
Signed-off-by: default avatarDimitris Papastamos <dimitris.papastamos@arm.com>
0319a977
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