On Fri, Sep 20, 2013 at 4:05 AM, Peter Maydell <peter.mayd...@linaro.org>wrote:
> On 20 September 2013 06:55, Mj Embd <mj.e...@gmail.com> wrote: > > Hello Andre, > > I need a bit clarification here, if you read the next line after the line > > you have quoted. It clearly says that you can use a MCR to change from > > Secure to NS in Monitor Mode > > No, it's not saying that, because Monitor mode is always Secure: > this is exactly why an MCR to change SCR.NS is OK only in > Monitor mode -- it doesn't change from Secure to Non-Secure. > Only when you do an exception-return to leave Monitor mode > will you drop into the NonSecure world. > > > "Use an MCR instruction that writes SCR.NS to change from Secure to > > Non-secure state. This means ARM recommends that software does not alter > > SCR.NS in any mode except Monitor mode. ARM deprecates changing SCR.NS in > > any other mode." > > The text says "don't change from Secure to NonSecure by flipping > SCR.NS". It then lays out the corollary: the only time you then can > change SCR.NS is when it won't switch from Secure to NonSecure, > which is when you're in Monitor mode. > > [MJ] Ok got your point. Then what would be the steps to return from Monitor to Hyp mode? > -- PMM > -- -mj
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