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54035fc467
The LDNP/STNP instructions as implemented on Cortex-A53 and Cortex-A57 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 Document ARM DDI 0487A.h, section D3.4.3) allows cores to ignore the non-temporal hint and treat LDNP/STNP as LDP/STP instead. This patch introduces 2 new build flags: A53_DISABLE_NON_TEMPORAL_HINT and A57_DISABLE_NON_TEMPORAL_HINT to enforce this behaviour on Cortex-A53 and Cortex-A57. They are enabled by default. The string printed in debug builds when a specific CPU errata workaround is compiled in but skipped at runtime has been generalised, so that it can be reused for the non-temporal hint use case as well. Change-Id: I3e354f4797fd5d3959872a678e160322b13867a1
91 lines
3.5 KiB
Makefile
91 lines
3.5 KiB
Makefile
#
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# Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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#
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# Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# Neither the name of ARM nor the names of its contributors may be used
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# to endorse or promote products derived from this software without specific
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# prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# Cortex A57 specific optimisation to skip L1 cache flush when
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# cluster is powered down.
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SKIP_A57_L1_FLUSH_PWR_DWN ?=0
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# Flag to disable the cache non-temporal hint.
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# It is enabled by default.
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A53_DISABLE_NON_TEMPORAL_HINT ?=1
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# Flag to disable the cache non-temporal hint.
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# It is enabled by default.
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A57_DISABLE_NON_TEMPORAL_HINT ?=1
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# Process SKIP_A57_L1_FLUSH_PWR_DWN flag
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$(eval $(call assert_boolean,SKIP_A57_L1_FLUSH_PWR_DWN))
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$(eval $(call add_define,SKIP_A57_L1_FLUSH_PWR_DWN))
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# Process A53_DISABLE_NON_TEMPORAL_HINT flag
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$(eval $(call assert_boolean,A53_DISABLE_NON_TEMPORAL_HINT))
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$(eval $(call add_define,A53_DISABLE_NON_TEMPORAL_HINT))
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# Process A57_DISABLE_NON_TEMPORAL_HINT flag
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$(eval $(call assert_boolean,A57_DISABLE_NON_TEMPORAL_HINT))
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$(eval $(call add_define,A57_DISABLE_NON_TEMPORAL_HINT))
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# CPU Errata Build flags. These should be enabled by the
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# platform if the errata needs to be applied.
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# Flag to apply errata 826319 during reset. This errata applies only to
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# revision <= r0p2 of the Cortex A53 cpu.
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ERRATA_A53_826319 ?=0
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# Flag to apply errata 836870 during reset. This errata applies only to
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# revision <= r0p3 of the Cortex A53 cpu. From r0p4 and onwards, this
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# errata is enabled by default.
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ERRATA_A53_836870 ?=0
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# Flag to apply errata 806969 during reset. This errata applies only to
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# revision r0p0 of the Cortex A57 cpu.
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ERRATA_A57_806969 ?=0
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# Flag to apply errata 813420 during reset. This errata applies only to
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# revision r0p0 of the Cortex A57 cpu.
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ERRATA_A57_813420 ?=0
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# Process ERRATA_A53_826319 flag
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$(eval $(call assert_boolean,ERRATA_A53_826319))
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$(eval $(call add_define,ERRATA_A53_826319))
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# Process ERRATA_A53_836870 flag
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$(eval $(call assert_boolean,ERRATA_A53_836870))
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$(eval $(call add_define,ERRATA_A53_836870))
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# Process ERRATA_A57_806969 flag
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$(eval $(call assert_boolean,ERRATA_A57_806969))
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$(eval $(call add_define,ERRATA_A57_806969))
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# Process ERRATA_A57_813420 flag
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$(eval $(call assert_boolean,ERRATA_A57_813420))
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$(eval $(call add_define,ERRATA_A57_813420))
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