OPENPIC_IMASK
x |= OPENPIC_IMASK;
x |= OPENPIC_IMASK;
x &= ~(OPENPIC_IMASK | OPENPIC_VECTOR_MASK);
x &= ~(OPENPIC_IMASK | OPENPIC_VECTOR_MASK);
x |= OPENPIC_IMASK;
x |= OPENPIC_IMASK;
x &= ~OPENPIC_IMASK;
x &= ~OPENPIC_IMASK;