2 Commits

Author	SHA1	Message	Date
Meng Zhuo	c0a9559877	cpu: add crypto extensions detection for riscv64 ... This CL adds RISC-V cryptography extensions detection. Direct detection of the extensions zvkned, zvknhb, zvksed and zvksh is not supported, since the crypto spec requires these extensions implemented with data independent timing (zkt). However, their presence may be inferred by checking for the shorthand extensions: zvkn, zvknc, zvkng, zvks, zvksc, zvksg. Change-Id: Ic00038cebf1b9f77426876b06b08f206473ad6fb Reviewed-on: https://go-review.googlesource.com/c/sys/+/664375 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Junyang Shao <shaojunyang@google.com> Reviewed-by: Mark Ryan <markdryan@rivosinc.com> Reviewed-by: Carlos Amedee <carlos@golang.org> Reviewed-by: Pengcheng Wang <wangpengcheng.pp@bytedance.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>	2025-05-01 02:30:04 -07:00
Mark Ryan	3283fc3f61	cpu: add support for detecting RISC-V extensions ... 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>	2024-08-23 10:43:34 +00:00