The interrupts use Lolo's interrupt handling mechanism.

To use interrupts, you should create an interrupt handler:

static int pcmcia_intr_handler(u_int intr, void *data, struct regs *regs){... intr_clear(IRQ_number);}

Then register the handler to an IRQ_number:

intr_register_handler(IRQ_number, pcmcia_intr_handler, NULL);

Enable your interrupt:

intr_enable(IRQ_number);

Enable global interrupts:

intr_set_mask(INTR_ENABLE);

Thank you robinb, it's very clear.
I have tested it immediately.
I supposed the IRQ_number is uP Interrupt Source, indeed timer1 interrupt (IRQ_number 0x3D) works well.
I noted that if I use a wrong IRQ_number function intr_enable(IRQ_number) returns error printing:
enable_interrupt unknown intr xxxxxxxx
Only with the IRQ_number 0x26, 0x27, 0x30, 0x3D the function don't return error.
How can I use other interrupt source?

You raise a good point. Currently, Logicloader only supports enabling a small subset of possible interrupts. To use another interrupt source, you will need to write your own interrupt enabling routine. To write such a routine, you will need to read the processor's manual to determine what registers/bits need to be set to enable your interrupt and then set them in your code.