x86: mpspec: Allow platform to determine how PIRQ is connected to I/O APIC
Currently during writing MP table I/O interrupt assignment entry, we assume the PIRQ is directly mapped to I/O APIC INTPIN#16-23, which however is not always the case on some platforms. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Acked-by: NSimon Glass <sjg@chromium.org>
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