ISA_IRQ_VECTOR
apicd->vector = ISA_IRQ_VECTOR(virq);
seq_printf(m, "%*sVector: %5d\n", ind, "", ISA_IRQ_VECTOR(irq));
irq_matrix_assign_system(vector_matrix, ISA_IRQ_VECTOR(irq), replace);
irq_matrix_assign(vector_matrix, ISA_IRQ_VECTOR(i));
int isairq = vector - ISA_IRQ_VECTOR(0);
outb_pic(ISA_IRQ_VECTOR(0), PIC_MASTER_IMR);
outb_pic(ISA_IRQ_VECTOR(8), PIC_SLAVE_IMR);
per_cpu(vector_irq, 0)[ISA_IRQ_VECTOR(i)] = irq_to_desc(i);