PS2LBUTMASK       277 dev/pckbc/pms.c #define PS2LBUTMASK 0x01
PS2LBUTMASK       296 dev/pckbc/pms_intelli.c #define PS2LBUTMASK 0x01
PS2LBUTMASK        84 dev/usb/ums.c  #define PS2LBUTMASK	x01