Workaround Alchemy task not beeing waken up when closing file descriptor it is waiting on, sequel of Xenomai3 all posix file ops
/*
Define the i/o port global symbol
*/
.globl _io_ports
_io_ports=0x0000
/*
0x0000 is the default mapping at reset. (it is 0x1000 for 68hc11)
*/