OPENPIC_VECTOR_MASK
x &= ~(OPENPIC_IMASK | OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK);
return u3_ht_read(u3_ht, OPENPIC_IACK(cpu)) & OPENPIC_VECTOR_MASK;
return openpic_read(OPENPIC_IACK(cpu)) & OPENPIC_VECTOR_MASK;
x &= ~(OPENPIC_IMASK | OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK);