Commit ee988c11 authored May 21, 2020 by Alistair Popple Committed by Michael Ellerman Jun 02, 2020

powerpc: Add new HWCAP bits



POWER10 introduces two new architectural features - ISAv3.1 and matrix
multiply assist (MMA) instructions. Userspace detects the presence
of these features via two HWCAP bits introduced in this patch. These
bits have been agreed to by the compiler and binutils team.

According to ISAv3.1 MMA is an optional feature and software that makes
use of it should first check for availability via this HWCAP bit and use
alternate code paths if unavailable.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Tested-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200521014341.29095-2-alistair@popple.id.au

parent c887ef57

arch/powerpc/include/uapi/asm/cputable.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -50,6 +50,8 @@
		#define PPC_FEATURE2_DARN 0x00200000 /* darn random number insn */
		#define PPC_FEATURE2_SCV 0x00100000 /* scv syscall */
		#define PPC_FEATURE2_HTM_NO_SUSPEND 0x00080000 /* TM w/out suspended state */
		#define PPC_FEATURE2_ARCH_3_1 0x00040000 /* ISA 3.1 */
		#define PPC_FEATURE2_MMA 0x00020000 /* Matrix Multiply Assist */

		/*
		* IMPORTANT!

Admin message