[PATCH v2 09/10] arm64: Add wfet()/wfit() helpers

Marc Zyngier
2022-04-19T18:34:24Z

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>
---
arch/arm64/include/asm/barrier.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index 62217be36217..9f3e2c3d2ca0 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -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")
--
2.34.1