HelenOS sources

XHCI_PORT_PS      113 uspace/drv/bus/usb/xhci/debug.c 	DUMP_REG(port, XHCI_PORT_PS);
XHCI_PORT_PS      169 uspace/drv/bus/usb/xhci/rh.c 	unsigned psiv = (status & XHCI_REG_MASK(XHCI_PORT_PS)) >>
XHCI_PORT_PS      170 uspace/drv/bus/usb/xhci/rh.c 	    XHCI_REG_SHIFT(XHCI_PORT_PS);
HelenOS homepage, sources at GitHub