HelenOS sources

EHCI_RD8          135 uspace/drv/bus/usb/ehci/hc.c 	    (ehci_regs_t *)(RNGABSPTR(regs) + EHCI_RD8(instance->caps->caplength));
EHCI_RD8          175 uspace/drv/bus/usb/ehci/hc.c 	    (void *)instance->caps + EHCI_RD8(instance->caps->caplength);
EHCI_RD8          178 uspace/drv/bus/usb/ehci/hc.c 	    EHCI_RD8(instance->caps->caplength));
HelenOS homepage, sources at GitHub