[PATCH v4 03/11] RISC-V: add TOOLCHAIN_HAS_VECTOR_CRYPTO in kconfig

[Jerry Shih]

LLVM main and binutils master now both fully support v1.0 of the RISC-V
vector crypto extensions. Check the assembler capability for using the
vector crypto asm mnemonics in kernel.

Co-developed-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Jerry Shih <jerry.shih@xxxxxxxxxx>
---
 arch/riscv/Kconfig | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 0a03d72706b5..8647392ece0b 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -636,6 +636,14 @@ config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
 	  versions of clang and GCC to be passed to GAS, which has the same result
 	  as passing zicsr and zifencei to -march.
 
+# This option indicates that the toolchain supports all v1.0 vector crypto
+# extensions, including Zvk*, Zvbb, and Zvbc. The LLVM added all of these at
+# once. The binutils added all except Zvkb, then added Zvkb. So we just check
+# for Zvkb.
+config TOOLCHAIN_HAS_VECTOR_CRYPTO
+	def_bool $(as-instr, .option arch$(comma) +zvkb)
+	depends on AS_HAS_OPTION_ARCH
+
 config FPU
 	bool "FPU support"
 	default y
-- 
2.28.0