RISCV_PCI_INTR_IRQ
const int irq = __SHIFTOUT(ih, RISCV_PCI_INTR_IRQ);
specifier = pcihost_find_intr(sc, ih & RISCV_PCI_INTR_IRQ, &ihandle);
specifier = pcihost_find_intr(sc, pih & RISCV_PCI_INTR_IRQ, &ihandle);