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+ARM CPU Specific Build Macros
+=============================
+
+
+.. section-numbering::
+    :suffix: .
+
+.. contents::
+
+This document describes the various build options present in the CPU specific
+operations framework to enable errata workarounds and to enable optimizations
+for a specific CPU on a platform.
+
+CPU Errata Workarounds
+----------------------
+
+ARM Trusted Firmware exports a series of build flags which control the
+errata workarounds that are applied to each CPU by the reset handler. The
+errata details can be found in the CPU specific errata documents published
+by ARM:
+
+-  `Cortex-A53 MPCore Software Developers Errata Notice`_
+-  `Cortex-A57 MPCore Software Developers Errata Notice`_
+
+The errata workarounds are implemented for a particular revision or a set of
+processor revisions. This is checked by the reset handler at runtime. Each
+errata workaround is identified by its ``ID`` as specified in the processor's
+errata notice document. The format of the define used to enable/disable the
+errata workaround is ``ERRATA_<Processor name>_<ID>``, where the ``Processor name``
+is for example ``A57`` for the ``Cortex_A57`` CPU.
+
+Refer to the section *CPU errata status reporting* in
+`Firmware Design guide`_ for information on to write errata workaround functions.
+
+All workarounds are disabled by default. The platform is responsible for
+enabling these workarounds according to its requirement by defining the
+errata workaround build flags in the platform specific makefile. In case
+these workarounds are enabled for the wrong CPU revision then the errata
+workaround is not applied. In the DEBUG build, this is indicated by
+printing a warning to the crash console.
+
+In the current implementation, a platform which has more than 1 variant
+with different revisions of a processor has no runtime mechanism available
+for it to specify which errata workarounds should be enabled or not.
+
+The value of the build flags are 0 by default, that is, disabled. Any other
+value will enable it.
+
+For Cortex-A53, following errata build flags are defined :
+
+-  ``ERRATA_A53_826319``: This applies errata 826319 workaround to Cortex-A53
+   CPU. This needs to be enabled only for revision <= r0p2 of the CPU.
+
+-  ``ERRATA_A53_836870``: This applies errata 836870 workaround to Cortex-A53
+   CPU. This needs to be enabled only for revision <= r0p3 of the CPU. From
+   r0p4 and onwards, this errata is enabled by default in hardware.
+
+-  ``ERRATA_A53_855873``: This applies errata 855873 workaround to Cortex-A53
+   CPUs. Though the erratum is present in every revision of the CPU,
+   this workaround is only applied to CPUs from r0p3 onwards, which feature
+   a chicken bit in CPUACTLR\_EL1 to enable a hardware workaround.
+   Earlier revisions of the CPU have other errata which require the same
+   workaround in software, so they should be covered anyway.
+
+For Cortex-A57, following errata build flags are defined :
+
+-  ``ERRATA_A57_806969``: This applies errata 806969 workaround to Cortex-A57
+   CPU. This needs to be enabled only for revision r0p0 of the CPU.
+
+-  ``ERRATA_A57_813419``: This applies errata 813419 workaround to Cortex-A57
+   CPU. This needs to be enabled only for revision r0p0 of the CPU.
+
+-  ``ERRATA_A57_813420``: This applies errata 813420 workaround to Cortex-A57
+   CPU. This needs to be enabled only for revision r0p0 of the CPU.
+
+-  ``ERRATA_A57_826974``: This applies errata 826974 workaround to Cortex-A57
+   CPU. This needs to be enabled only for revision <= r1p1 of the CPU.
+
+-  ``ERRATA_A57_826977``: This applies errata 826977 workaround to Cortex-A57
+   CPU. This needs to be enabled only for revision <= r1p1 of the CPU.
+
+-  ``ERRATA_A57_828024``: This applies errata 828024 workaround to Cortex-A57
+   CPU. This needs to be enabled only for revision <= r1p1 of the CPU.
+
+-  ``ERRATA_A57_829520``: This applies errata 829520 workaround to Cortex-A57
+   CPU. This needs to be enabled only for revision <= r1p2 of the CPU.
+
+-  ``ERRATA_A57_833471``: This applies errata 833471 workaround to Cortex-A57
+   CPU. This needs to be enabled only for revision <= r1p2 of the CPU.
+
+CPU Specific optimizations
+--------------------------
+
+This section describes some of the optimizations allowed by the CPU micro
+architecture that can be enabled by the platform as desired.
+
+-  ``SKIP_A57_L1_FLUSH_PWR_DWN``: This flag enables an optimization in the
+   Cortex-A57 cluster power down sequence by not flushing the Level 1 data
+   cache. The L1 data cache and the L2 unified cache are inclusive. A flush
+   of the L2 by set/way flushes any dirty lines from the L1 as well. This
+   is a known safe deviation from the Cortex-A57 TRM defined power down
+   sequence. Each Cortex-A57 based platform must make its own decision on
+   whether to use the optimization.
+
+-  ``A53_DISABLE_NON_TEMPORAL_HINT``: This flag disables the cache non-temporal
+   hint. The LDNP/STNP instructions as implemented on Cortex-A53 do not behave
+   in a way most programmers expect, and will most probably result in a
+   significant speed degradation to any code that employs them. The ARMv8-A
+   architecture (see ARM DDI 0487A.h, section D3.4.3) allows cores to ignore
+   the non-temporal hint and treat LDNP/STNP as LDP/STP instead. Enabling this
+   flag enforces this behaviour. This needs to be enabled only for revisions
+   <= r0p3 of the CPU and is enabled by default.
+
+-  ``A57_DISABLE_NON_TEMPORAL_HINT``: This flag has the same behaviour as
+   ``A53_DISABLE_NON_TEMPORAL_HINT`` but for Cortex-A57. This needs to be
+   enabled only for revisions <= r1p2 of the CPU and is enabled by default,
+   as recommended in section "4.7 Non-Temporal Loads/Stores" of the
+   `Cortex-A57 Software Optimization Guide`_.
+
+--------------
+
+*Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.*
+
+.. _Cortex-A53 MPCore Software Developers Errata Notice: http://infocenter.arm.com/help/topic/com.arm.doc.epm048406/index.html
+.. _Cortex-A57 MPCore Software Developers Errata Notice: http://infocenter.arm.com/help/topic/com.arm.doc.epm049219/cortex_a57_mpcore_software_developers_errata_notice.pdf
+.. _Firmware Design guide: firmware-design.rst
+.. _Cortex-A57 Software Optimization Guide: http://infocenter.arm.com/help/topic/com.arm.doc.uan0015b/Cortex_A57_Software_Optimization_Guide_external.pdf