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Move definition of -D__ARM_FEATURE_LPAE=1 cflag to top-level. 

LPAE indicates better instructions can be used when atomicity guarantees are
needed. However, LPAE's presence isn't advertised by clang/GCC. We fake an
ARM feature to advertise its presence on architectures where it is.
Also, add a TODO documenting that cortex-a15 is not the correct CPU variant
for krait.

Change-Id: I02a1248025c32d94eca0bc8a249dc524f1ac9c36
This commit is contained in:
Ian Rogers 2014-10-15 15:44:16 -07:00
parent c131ec09d9
commit 63e551f0ae
1 changed files with 7 additions and 0 deletions
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7
core/combo/arch/arm/armv7-a-neon.mk
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@ -7,7 +7,14 @@ ARCH_ARM_HAVE_VFP_D32 := true
ARCH_ARM_HAVE_NEON := true
ifneq (,$(filter cortex-a15 krait denver,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
# TODO: krait is not a cortex-a15, we set the variant to cortex-a15 so that
# hardware divide operations are generated. This should be removed and a
# krait CPU variant added to GCC/clang.
arch_variant_cflags := -mcpu=cortex-a15
# Fake an ARM compiler flag as these processors support LPAE which GCC/clang
# don't advertise.
arch_variant_cflags += -D__ARM_FEATURE_LPAE=1
else
ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a8)
arch_variant_cflags := -mcpu=cortex-a8