HelenOS sources

XHCI_PSI_PSIM     307 uspace/drv/bus/usb/xhci/debug.c 	    XHCI_REG_RD(psi, XHCI_PSI_PSIM),
XHCI_PSI_PSIM     134 uspace/drv/bus/usb/xhci/hc.c 					unsigned sim = XHCI_REG_RD(psi, XHCI_PSI_PSIM);
XHCI_PSI_PSIM     137 uspace/drv/bus/usb/xhci/hc.c 					unsigned psim = XHCI_REG_RD(psi, XHCI_PSI_PSIM);
HelenOS homepage, sources at GitHub