On 6/20/23 13:09, Palmer Dabbelt wrote:
On Mon, 12 Jun 2023 14:31:14 PDT (-0700), Conor Dooley wrote:
Hey Heiko,
On Mon, Jun 12, 2023 at 11:04:39PM +0200, Heiko Stuebner wrote:
From: Heiko Stuebner <heiko.stuebner@xxxxxxxx>
Add handling for Zbc extension.
Zbc provides instruction for carry-less multiplication.
Signed-off-by: Heiko Stuebner <heiko.stuebner@xxxxxxxx>
---
arch/riscv/Kconfig | 22 ++++++++++++++++++++++
arch/riscv/include/asm/hwcap.h | 1 +
arch/riscv/kernel/cpu.c | 1 +
arch/riscv/kernel/cpufeature.c | 1 +
4 files changed, 25 insertions(+)
Plumbing into the hwprobe stuff would be nice, but that's not a
requirement for getting stuff merged :)
IIRC we talked about this on IRC, but IMO we shouldn't require something
be user visible for it to be merged in the kernel.
Note that exposing Zbc is potentially useful. We've got GCC and LLVM
code that can detect and rewrite a bitwise CRC into clmul.
Jeff
