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3283fc3f61
Add a RISCV64 variable to cpu that indicates both the presence of RISC-V extensions and performance information about the underlying RISC-V cores. The variable is only populated with non false values on Linux. The detection code first attempts to use the riscv_hwprobe syscall introduced in Linux 6.4, falling back to HWCAP if riscv_hwprobe is not supported. The patch can detect the C, V, Zba, Zbb and Zbs extensions. V, Zba, Zbb and Zbs can only be detected on a 6.5 kernel or later (without backports). Updates golang/go#61416 Change-Id: I40f92724ee3d337c06bdc559ff0b18a8f6bfda9f Reviewed-on: https://go-review.googlesource.com/c/sys/+/605815 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Joel Sing <joel@sing.id.au> Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>