<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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.<br><br>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.<br><br>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.<div><br></div><div>v2 implements handling for the HIOR register, bringing interrupt handlers to RAM.<br><br>Signed-off-by: Alexander Graf <<a href="mailto:alex@csgraf.de">alex@csgraf.de</a>><br></div><div><br></div><div></div></body></html>