> From: Russell King - ARM Linux [mailto:[email protected]]
> Sent: Monday, May 18, 2009 3:25 PM
> The call to the enter method essentially calls the core specific suspend
> function (eg, pxa25x_cpu_suspend()), which is an assembly function which
> ultimately ends up powering down the core resulting in full loss of state
> in the CPU. We seem to be able to avoid having to save the exception mode
> registers there.
>
> The same thing is done with sa11x0 and Samsung SoCs.
>
> I don't see any reason for OMAP to be "special" in this regard.
The code flow is:
- Wakeup event
- ARM reboots and uses SOC mask ROM context restore helper
- Mask ROM code jump to restore pointers with MMU OFF.
- Restore code resets ARM CortexA8 state
-*- Trustzone SMI calls are made to restore some secure state
- Jump back from SRAM to C code
The dangling question to me is if any of the cpu state is needed by the
trustzone monitor code as a precondition. The doc's I have led me to believe
its ok, but I've not verified this.
Regards,
Richard W.
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