kumquat-buildroot/arch/Config.in.riscv
Mark Corbin aee39cbf27 arch/riscv: set the default float ABI based on ISA extensions
This patch sets the default floating point ABI based on the ISA
extensions that have been selected rather than defaulting to soft
float.

For 64-bit:

ISA 'D' selects  lp64d
ISA 'F' selects  lp64f
Otherwise select lp64

For 32-bit:

ISA 'D' selects  ilp32d
ISA 'F' selects  ilp32f
Otherwise select ilp32

This change was proposed by Palmer Dabbelt at SiFive.

Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2019-09-19 21:43:53 +02:00

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# RISC-V CPU ISA extensions.
config BR2_RISCV_ISA_RVI
bool
config BR2_RISCV_ISA_RVM
bool
config BR2_RISCV_ISA_RVA
bool
config BR2_RISCV_ISA_RVF
bool
config BR2_RISCV_ISA_RVD
bool
config BR2_RISCV_ISA_RVC
bool
choice
prompt "Target Architecture Variant"
default BR2_riscv_g
config BR2_riscv_g
bool "General purpose (G)"
select BR2_RISCV_ISA_RVI
select BR2_RISCV_ISA_RVM
select BR2_RISCV_ISA_RVA
select BR2_RISCV_ISA_RVF
select BR2_RISCV_ISA_RVD
help
General purpose (G) is equivalent to IMAFD.
config BR2_riscv_custom
bool "Custom architecture"
select BR2_RISCV_ISA_RVI
select BR2_RISCV_ISA_CUSTOM_RVA
endchoice
if BR2_riscv_custom
comment "Instruction Set Extensions"
config BR2_RISCV_ISA_CUSTOM_RVM
bool "Integer Multiplication and Division (M)"
select BR2_RISCV_ISA_RVM
config BR2_RISCV_ISA_CUSTOM_RVA
bool "Atomic Instructions (A)"
select BR2_RISCV_ISA_RVA
config BR2_RISCV_ISA_CUSTOM_RVF
bool "Single-precision Floating-point (F)"
select BR2_RISCV_ISA_RVF
config BR2_RISCV_ISA_CUSTOM_RVD
bool "Double-precision Floating-point (D)"
depends on BR2_RISCV_ISA_RVF
select BR2_RISCV_ISA_RVD
config BR2_RISCV_ISA_CUSTOM_RVC
bool "Compressed Instructions (C)"
select BR2_RISCV_ISA_RVC
endif
choice
prompt "Target Architecture Size"
default BR2_RISCV_64
config BR2_RISCV_32
bool "32-bit"
config BR2_RISCV_64
bool "64-bit"
select BR2_ARCH_IS_64
endchoice
choice
prompt "Target ABI"
default BR2_RISCV_ABI_ILP32D if !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
default BR2_RISCV_ABI_ILP32F if !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
default BR2_RISCV_ABI_ILP32 if !BR2_ARCH_IS_64
default BR2_RISCV_ABI_LP64D if BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
default BR2_RISCV_ABI_LP64F if BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
default BR2_RISCV_ABI_LP64 if BR2_ARCH_IS_64
config BR2_RISCV_ABI_ILP32
bool "ilp32"
depends on !BR2_ARCH_IS_64
config BR2_RISCV_ABI_ILP32F
bool "ilp32f"
depends on !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
config BR2_RISCV_ABI_ILP32D
bool "ilp32d"
depends on !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
config BR2_RISCV_ABI_LP64
bool "lp64"
depends on BR2_ARCH_IS_64
config BR2_RISCV_ABI_LP64F
bool "lp64f"
depends on BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
config BR2_RISCV_ABI_LP64D
bool "lp64d"
depends on BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
endchoice
config BR2_ARCH
default "riscv32" if !BR2_ARCH_IS_64
default "riscv64" if BR2_ARCH_IS_64
config BR2_ENDIAN
default "LITTLE"
config BR2_GCC_TARGET_ABI
default "ilp32" if BR2_RISCV_ABI_ILP32
default "ilp32f" if BR2_RISCV_ABI_ILP32F
default "ilp32d" if BR2_RISCV_ABI_ILP32D
default "lp64" if BR2_RISCV_ABI_LP64
default "lp64f" if BR2_RISCV_ABI_LP64F
default "lp64d" if BR2_RISCV_ABI_LP64D
config BR2_READELF_ARCH_NAME
default "RISC-V"
# vim: ft=kconfig
# -*- mode:kconfig; -*-