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c97cba4ea4
Make the spinlock implementation use ARMv8.1-LSE CAS instruction based on a platform build option. The CAS-based implementation used to be unconditionally selected for all ARM8.1+ platforms. The previous CAS spinlock implementation had a bug wherein the spin_unlock() implementation had an `sev` after `stlr` which is not sufficient. A dsb is needed to ensure that the stlr completes prior to the sev. Having a dsb is heavyweight and a better solution would be to use load exclusive semantics to monitor the lock and wake up from wfe when a store happens to the lock. The patch implements the same. Change-Id: I5283ce4a889376e4cc01d1b9d09afa8229a2e522 Signed-off-by: Soby Mathew <soby.mathew@arm.com> Signed-off-by: Olivier Deprez <olivier.deprez@arm.com> |
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| .. | ||
| components | ||
| design | ||
| getting_started | ||
| perf | ||
| plat | ||
| process | ||
| resources | ||
| security_advisories | ||
| acknowledgements.rst | ||
| change-log.rst | ||
| conf.py | ||
| contents.rst | ||
| global_substitutions.txt | ||
| glossary.rst | ||
| index.rst | ||
| license.rst | ||
| maintainers.rst | ||
| Makefile | ||
| requirements.txt | ||