ppc: Fix rfi/rfid/hrfi/... emulation
This reworks emulation of the various "rfi" variants. I removed some masking bits that I couldn't make sense of, the only bit that I am aware we should mask here is POW, the CPU's MSR mask should take care of the rest. This also fixes some problems when running 32-bit userspace under a 64-bit kernel. This patch broke 32bit OpenBIOS when run under a 970 cpu. A fix was proposed here : https://www.coreboot.org/pipermail/openbios/2016-June/009452.htmlSigned-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> [clg: updated the commit log with the reference of the openbios fix ] Signed-off-by: NCédric Le Goater <clg@kaod.org> [dwg: Remove hunk which disabled rfi on 64-bit CPUS. The change was correct, but we need to fix OpenBIOS before applying it] Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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