Handle hype_fac_unavail exception.

    The P8 processor (in RFC02230 targeted for ISA 2.07) adds a
    new SPR register HFSCR (Hypervisor Facility Status and Control
    Register).  This register allows the hypervisor to disable
    access to some resources, such as floating point and VSX,
    from a partition.  The purpose of this is to save time in
    saving the partition context when switching partitions.

    Since we sometimes enable floating point instructions we need
    to also enable the HFSCR[FP].  We could do this when enabling
    floating point in the MSR, but the SPR does not exist in P7.
    Instead we'll do it as-needed on the hw-thread the first time
    it executes a FP instruction.  The FP instruction will cause
    the hype_fac_unavail exception and the exception handler will
    set HFSCR appropriately.

Change-Id: I6c1e75939bb59142cbcf692fa56deb2271d6bdc3
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/676
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: Douglas R. Gilbert <dgilbert@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/include/kernel/ppcconsts.S b/src/include/kernel/ppcconsts.S
index b83678907..6aa53a6cd 100644
--- a/src/include/kernel/ppcconsts.S
+++ b/src/include/kernel/ppcconsts.S
@@ -142,6 +142,7 @@
                 .set SRR0,26
                 .set SRR1,27
                 .set CFAR,28
+                .set HFSCR,190
                 .set TB,268
                 .set SPRG0,272
                 .set SPRG1,273