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Punit Agrawal c852f32058 arm64: Emulate CP15 Barrier instructions 
The CP15 barrier instructions (CP15ISB, CP15DSB and CP15DMB) are
deprecated in the ARMv7 architecture, superseded by ISB, DSB and DMB
instructions respectively. Some implementations may provide the
ability to disable the CP15 barriers by disabling the CP15BEN bit in
SCTLR_EL1. If not enabled, the encodings for these instructions become
undefined.

To support legacy software using these instructions, this patch
register hooks to -
* emulate CP15 barriers and warn the user about their use
* toggle CP15BEN in SCTLR_EL1

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-11-20 16:34:48 +00:00
..
booting.txt KVM/ARM New features for 3.17 include: 2014-08-05 09:47:45 +02:00
legacy_instructions.txt arm64: Emulate CP15 Barrier instructions 2014-11-20 16:34:48 +00:00
memory.txt Documentation/arm64/memory.txt: fix typo 2014-10-20 17:55:38 +01:00
tagged-pointers.txt arm64: documentation: tighten up tagged pointer documentation 2013-09-20 09:56:06 +01:00