Commit 9a0b3b68 authored Apr 19, 2022 by Marc Zyngier Committed by Kunkun Jiang May 16, 2023

arm64: Add wfet()/wfit() helpers

mainline inclusion
from mainline-v5.19-rc1
commit 9eae5885
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6YAMV
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9eae588529751f95834bca775b30b66291def7f6



-------------------------------

Just like we have helpers for WFI and WFE, add the WFxT versions.
Note that the encoding is that reported by objdump, as no currrent
toolchain knows about these instructions yet.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419182755.601427-10-maz@kernel.org


Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>

parent c00c6ce6

arch/arm64/include/asm/barrier.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -16,7 +16,11 @@

		#define sev() asm volatile("sev" : : : "memory")
		#define wfe() asm volatile("wfe" : : : "memory")
		#define wfet(val) asm volatile("msr s0_3_c1_c0_0, %0" \
		: : "r" (val) : "memory")
		#define wfi() asm volatile("wfi" : : : "memory")
		#define wfit(val) asm volatile("msr s0_3_c1_c0_1, %0" \
		: : "r" (val) : "memory")

		#define isb() asm volatile("isb" : : : "memory")
		#define dmb(opt) asm volatile("dmb " #opt : : : "memory")