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soc: arm: Kconfig option to indicate double-precision FP

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This commit introduces a Kconfig option for ARM SoCs, to signify
that the SoC implements a double-precision floating point unit.
The option is utilized in cmake/fpu-for-gcc-m-cpu to select the
appropriate GCC compile option flag for FPU.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2019-02-08 14:58:26 +01:00 • committed by Kumar Gala
commit e029d08628
2 changed files with 18 additions and 3 deletions
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12
cmake/fpu-for-gcc-m-cpu.cmake
View file

@ -1,5 +1,11 @@
# Defines a mapping from GCC_M_CPU to FPU
set(FPU_FOR_cortex-m4 fpv4-sp-d16)
set(FPU_FOR_cortex-m7 fpv5-d16)
set(FPU_FOR_cortex-m33 fpv5-sp-d16)
if(CONFIG_CPU_HAS_FPU_DOUBLE_PRECISION)
set(PRECISION_TOKEN)
else()
set(PRECISION_TOKEN sp-)
endif()
set(FPU_FOR_cortex-m4 fpv4-${PRECISION_TOKEN}d16)
set(FPU_FOR_cortex-m7 fpv5-${PRECISION_TOKEN}d16)
set(FPU_FOR_cortex-m33 fpv5-${PRECISION_TOKEN}d16)

9
soc/arm/Kconfig
View file

@ -39,6 +39,15 @@ config CPU_HAS_NRF_IDAU
(IDAU: "Implementation-Defined Attribution Unit", in accordance with
ARM terminology).
config CPU_HAS_FPU_DOUBLE_PRECISION
bool
# Omit prompt to signify "hidden" option
depends on CPU_CORTEX_M7
select CPU_HAS_FPU
help
When enabled, indicates that the SoC has a double
floating point precision unit.
config HAS_SWO
bool
# Omit prompt to signify "hidden" option