diff options
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c5e42cc37604..eb7f29a412f8 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -126,6 +126,7 @@ config RISCV select OF_IRQ select PCI_DOMAINS_GENERIC if PCI select PCI_MSI if PCI + select RISCV_ALTERNATIVE if !XIP_KERNEL select RISCV_INTC select RISCV_TIMER if RISCV_SBI select SIFIVE_PLIC @@ -401,9 +402,8 @@ config RISCV_ISA_C config RISCV_ISA_SVPBMT bool "SVPBMT extension support" depends on 64BIT && MMU - depends on !XIP_KERNEL + depends on RISCV_ALTERNATIVE default y - select RISCV_ALTERNATIVE help Adds support to dynamically detect the presence of the SVPBMT ISA-extension (Supervisor-mode: page-based memory types) and @@ -428,8 +428,8 @@ config TOOLCHAIN_HAS_ZBB config RISCV_ISA_ZBB bool "Zbb extension support for bit manipulation instructions" depends on TOOLCHAIN_HAS_ZBB - depends on !XIP_KERNEL && MMU - select RISCV_ALTERNATIVE + depends on MMU + depends on RISCV_ALTERNATIVE default y help Adds support to dynamically detect the presence of the ZBB @@ -443,9 +443,9 @@ config RISCV_ISA_ZBB config RISCV_ISA_ZICBOM bool "Zicbom extension support for non-coherent DMA operation" - depends on !XIP_KERNEL && MMU + depends on MMU + depends on RISCV_ALTERNATIVE default y - select RISCV_ALTERNATIVE select RISCV_DMA_NONCOHERENT help Adds support to dynamically detect the presence of the ZICBOM @@ -464,6 +464,28 @@ config TOOLCHAIN_HAS_ZIHINTPAUSE depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zihintpause) depends on LLD_VERSION >= 150000 || LD_VERSION >= 23600 +config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI + def_bool y + # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc + depends on AS_IS_GNU && AS_VERSION >= 23800 + help + Newer binutils versions default to ISA spec version 20191213 which + moves some instructions from the I extension to the Zicsr and Zifencei + extensions. + +config TOOLCHAIN_NEEDS_OLD_ISA_SPEC + def_bool y + depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI + # https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16 + depends on CC_IS_CLANG && CLANG_VERSION < 170000 + help + Certain versions of clang do not support zicsr and zifencei via -march + but newer versions of binutils require it for the reasons noted in the + help text of CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI. This + option causes an older ISA spec compatible with these older versions + of clang to be passed to GAS, which has the same result as passing zicsr + and zifencei to -march. + config FPU bool "FPU support" default y |