On 24/08/15 14:55, Christopher Covington wrote:
ARM Linux appears to have never been made aware of the ARMv7 security extensions. When CONFIG_ARM_SEC_EXT=y, have it probe for its security state by checking whether CNTFRQ is writeable and potentially make mode changes based on the information. The most features are available from hypervisor (HYP) mode, so switch to it possible. Failing that, prefer non-secure supervisor (SVC) mode to secure supervisor mode.
If there is no hypervisor mode available what benefit do we get from transitioning to non-secure mode?
When running in secure mode we retain access to some potentially useful features such as having access to FIQ.
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