kgdb_attach      1669 arch/i386/isa/pccom.c 	kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL);
kgdb_attach      1447 dev/ic/com.c   	kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL);
kgdb_attach        96 sys/kgdb.h     void kgdb_attach(int (*)(void *), void (*)(void *, int), void *ioarg);