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arch/Config.in.arm: add FPU related options for ARMv8 cores

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The ARMv8 cores have a mandatory FPU unit called FP-ARMv8, so we:

 - add a new hidden Config.in option for the availability of this
   unit (BR2_ARM_CPU_HAS_FP_ARMV8)

 - allow the selection of a possible choice in the "Floating point
   strategy", and add two new choices: BR2_ARM_FPU_FP_ARMV8 and
   BR2_ARM_FPU_NEON_FP_ARMV8.

 - specify the -mfpu values for BR2_ARM_FPU_FP_ARMV8 and
   BR2_ARM_FPU_NEON_FP_ARMV8 cases, when used on ARM 32 bits (-mfpu
   doesn't exist on ARM64, instead -mcpu modifiers are used, so they
   will be added on a per-core basis).

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
[yann.morin.1998@free.fr: drop the FP strategy dependency]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2016-11-30 22:12:08 +01:00
parent 743e663912
commit d690b7444a
1 changed files with 21 additions and 0 deletions
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21
arch/Config.in.arm
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@ -31,6 +31,10 @@ config BR2_ARM_CPU_HAS_VFPV4
bool
select BR2_ARM_CPU_HAS_VFPV3
config BR2_ARM_CPU_HAS_FP_ARMV8
bool
select BR2_ARM_CPU_HAS_VFPV4
config BR2_ARM_CPU_HAS_ARM
bool
@ -308,6 +312,7 @@ endchoice
choice
prompt "Floating point strategy"
default BR2_ARM_FPU_FP_ARMV8 if BR2_ARM_CPU_HAS_FP_ARMV8
default BR2_ARM_FPU_VFPV4D16 if BR2_ARM_CPU_HAS_VFPV4
default BR2_ARM_FPU_VFPV3D16 if BR2_ARM_CPU_HAS_VFPV3
default BR2_ARM_FPU_VFPV2 if BR2_ARM_CPU_HAS_VFPV2
@ -418,6 +423,20 @@ config BR2_ARM_FPU_NEON_VFPV4
example on Cortex-A5 and Cortex-A7, support for VFPv4 and
NEON is optional.
config BR2_ARM_FPU_FP_ARMV8
bool "FP-ARMv8"
depends on BR2_ARM_CPU_HAS_FP_ARMV8
help
This option allows to use the ARMv8 floating point unit.
config BR2_ARM_FPU_NEON_FP_ARMV8
bool "NEON/FP-ARMv8"
depends on BR2_ARM_CPU_HAS_FP_ARMV8
depends on BR2_ARM_CPU_HAS_NEON
help
This option allows to use both the ARMv8 floating point unit
and the NEON SIMD unit for floating point operations.
endchoice
choice
@ -504,6 +523,8 @@ config BR2_GCC_TARGET_FPU
default "vfpv4-d16" if BR2_ARM_FPU_VFPV4D16
default "neon" if BR2_ARM_FPU_NEON
default "neon-vfpv4" if BR2_ARM_FPU_NEON_VFPV4
default "fp-armv8" if BR2_ARM_FPU_FP_ARMV8
default "neon-fp-armv8" if BR2_ARM_FPU_NEON_FP_ARMV8
config BR2_GCC_TARGET_FLOAT_ABI
default "soft" if BR2_ARM_SOFT_FLOAT