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CVS commit: src/sys/arch/aarch64/aarch64

Module Name:    src
Committed By:   jmcneill
Date:           Mon Aug 30 22:28:50 UTC 2021

Modified Files:
        src/sys/arch/aarch64/aarch64: idle_machdep.S

Log Message:
Ensure that all memory accesses prior to executing WFI have been completed
by adding a DSB SY before stopping execution and entering a low power
state. From the ARM Cortex-A Series Programmer's Guide for ARMv8-A:

"ARM recommends the use of a Data Synchronization Barrier (DSB) instruction
before WFI or WFE, to ensure that pending memory transactions complete before
changing state."

To generate a diff of this commit:
cvs rdiff -u -r1.9 -r1.10 src/sys/arch/aarch64/aarch64/idle_machdep.S

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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