RISC-V: add TOOLCHAIN_HAS_VECTOR_CRYPTO

Add a kconfig symbol that indicates whether the toolchain supports the
vector crypto extensions.  This is needed by the RISC-V crypto code.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20240122002024.27477-3-ebiggers@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index bffbd86..5613b2b 100644 (file)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -578,6 +578,13 @@ config TOOLCHAIN_HAS_ZBB
        depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
        depends on AS_HAS_OPTION_ARCH
 
+# This symbol indicates that the toolchain supports all v1.0 vector crypto
+# extensions, including Zvk*, Zvbb, and Zvbc.  LLVM added all of these at once.
+# 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 RISCV_ISA_ZBB
        bool "Zbb extension support for bit manipulation instructions"
        depends on TOOLCHAIN_HAS_ZBB