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No functional changes.

Change-Id: I2f28f20944f552447ac4e9e755493cd7c0ea1192
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Rule 8.4: A compatible declaration shall be visible when
          an object or function with external linkage is defined.

Change-Id: I26e042cb251a6f9590afa1340fdac73e42f23979
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>

Change-Id: I38470528111410cf12b187eb1397d87b812c9416
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>

Implement helpers to test if the core supports SPE/SVE.  We have a
similar helper for AMU and this patch makes all extensions consistent
in their implementation.

Change-Id: I3e6f7522535ca358259ad142550b19fcb883ca67
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>

Factor out SPE operations in a separate file.  Use the publish
subscribe framework to drain the SPE buffers before entering secure
world.  Additionally, enable SPE before entering normal world.

A side effect of this change is that the profiling buffers are now
only drained when a transition from normal world to secure world
happens.  Previously they were drained also on return from secure
world, which is unnecessary as SPE is not supported in S-EL1.

Change-Id: I17582c689b4b525770dbb6db098b3a0b5777b70a
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>