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a2c5251281
Improve and cleanup the Xen PIRQ event channel code: - Remove the xi_shared field as it is unused. - Clean the "pending" bit in the EOI handler, this is more similar to how native interrupts are handled. - Don't mask edge triggered PIRQs, edge trigger interrupts cannot be masked. - Panic if PHYSDEVOP_eoi fails. - Remove the usage of the PHYSDEVOP_alloc_irq_vector hypercall because it's just a no-op in the Xen versions that are supported by FreeBSD Dom0. Sponsored by: Citrix Systems R&D