[OpenBIOS] [PATCH] PPC64: Make OpenBIOS interrupt handlers 64bit aware v2

[Blue Swirl]

On 2/28/09, Alexander Graf <alex at csgraf.de> wrote:
> While booting a 64bit kernel, there is a small timeframe where OF and the
> kernel communicate with each other. Within that timeframe, DSI/ISI
> interrupts may occur, because some memory is not mapped yet.
>
> Right now in case that happens, we jump into the DSI/ISI interrupt handler
> which clobbers the high 32 bits of the kernel's registers. In order to
> circumvent that, let's save/restore all 64 bits of all kernel registers when
> we get a DSI/ISI interrupt.
>
> This patch enables a PPC64 Linux kernel to boot up to the point where it
> tries to set up the SLB entries (slbmte), which is not yet implemented in
> qemu.
>
> v2 implements handling for the HIOR register, bringing interrupt handlers to
> RAM.
>
> Signed-off-by: Alexander Graf <alex at csgraf.de>

Thanks, applied.