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Re: [Qemu-devel] [Qemu-ppc] [PATCH 01/10] ppc: Fix rfi/rfid/hrfi/... emu

From: Benjamin Herrenschmidt
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 01/10] ppc: Fix rfi/rfid/hrfi/... emulation
Date: Sun, 19 Jun 2016 09:30:55 +1000

On Fri, 2016-06-17 at 13:02 +0200, Thomas Huth wrote:
> According to the PPC970FX user manual that I have:
> "The 970FX does not provide support for the following optional or
>  obsolete instructions (or instruction forms).
>  Attempted use of these will result in an illegal instruction type
>  program interrupt.
>   [...]
>   · rfi - Return from interrupt (obsolete) "
> So if OpenBIOS is using this instruction in 970 mode, it's maybe
> OpenBIOS that should be fixed instead?

Right, I was about to say that ... This instruction *might* have
existed on POWER3 which we don't emulate, but definitely not on
POWER4 and later.


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