V_BUSY
while (readb(hc->xhfc_memdata) & V_BUSY)
while (readb(hc->pci_membase + R_STATUS) & V_BUSY)
while (inb(hc->pci_iobase) & V_BUSY)
#define F_BUSY V_BUSY(1U)
#define F_BUSY V_BUSY(1U)