Vishwa,
I have a more-or-less complete set of example code for CPU context save/restore, currently supporting A5/A8/A9 and with planned support for Eagle.
It is structured as "firmware" at the moment, but it would be much better if it was integrated into the ARM Linux kernel. The idea is the kernel calls it from CPUidle, and it saves all CPU context and cuts the power. Then when power returns, it restores all CPU context and returns to the kernel as if nothing has happened.
It handles just the CPU and cluster context, which on A9mpcore includes MMU, GIC, VFP, SCU, L2cc, Debug, etc. It takes care of cleaning caches and entering/leaving the coherency domain. There is also support for TrustZone, but as you say that's quite platform-specific.
So we would need to integrate this with the SoC-specific code somehow.
Jon. -- I work Tue/Wed/Fri only Jon Callan, Staff Software Engineer, Processor Division ARM Cambridge / +44 1223 400814
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