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Re: [Qemu-devel] [PATCH v3 06/12] ARM: Factor out ARM on/off PSCI contro

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v3 06/12] ARM: Factor out ARM on/off PSCI control functions
Date: Thu, 17 Mar 2016 08:46:24 +0000

On 16 March 2016 at 22:19, Jean-Christophe DUBOIS <address@hidden> wrote:
> Hi Peter,
> I am wondering what is the "correct" (simple?) way in QEMU to put a CPU in a
> particular state (HYP, SVC, MON, ...) after I reset it (using cpu_reset()).
> For example, if I reset a core that has "has_el3" property it will start in
> EL3 mode.

If it's AArch64, yes. If it's AArch32 then it will start in Secure-SVC
(which is EL3, but the distinction is that if you wanted NS-SVC then
what you need to flip is the NS bit.)

> Now what is the simple way to transition this CPU to EL1 before starting
> running it with target_cpu_class->set_pc(target_cpu_state, entry);

There is no convenient API provided for this -- if you look at boot.c
it just directly tweaks registers. We might want to abstract this out
a bit better.

-- PMM

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