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Modify kvmppc_read_intr to make it a C function. Because it is called
from kvmppc_check_wake_reason, any of the assembler code that calls
either kvmppc_read_intr or kvmppc_check_wake_reason now has to assume
that the volatile registers might have been modified.
This also adds in the optimization of clearing saved_xirr in the case
where we completely handle and EOI an IPI. Without this, the next
device interrupt will require two trips through the host interrupt
handling code.
[paulus@ozlabs.org - made kvmppc_check_wake_reason create a stack frame
when it is calling kvmppc_read_intr, which means we can set r12 to
the trap number (0x500) after the call to kvmppc_read_intr, instead
of using r31. Also moved the deliver_guest_interrupt label so as to
restore XER and CTR, plus other minor tweaks.]
Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
37f55d30df