i8254: Factor out pit_get_channel_info
Instead of providing 4 individual query functions for mode, gate, output and initial counter state, introduce a service that queries all information at once. This comes with tiny additional costs for pcspk_callback but with a much cleaner interface. Also, it will simplify the implementation of the KVM in-kernel PIT model. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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