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        push    20

        push    20

        pop     esi

        pop     esi

        call    delay_ms

        call    delay_ms

        pop     esi

        pop     esi

@@:

@@:

; 9. Return pointer to usb_controller.

; 9. Return pointer to usb_controller.

        xchg    eax, esi

        xchg    eax, esi

        ret

        ret

; On error, pop the pointer saved at step 1 and return zero.

; On error, pop the pointer saved at step 1 and return zero.

; Note that the main code branch restores the stack at step 7 and never fails

; Note that the main code branch restores the stack at step 7 and never fails

; 2. Get the mask of events which should be processed.

; 2. Get the mask of events which should be processed.

        mov     esi, [.controller]

        mov     esi, [.controller]

        mov     edi, [esi+ehci_controller.MMIOBase2-sizeof.ehci_controller]

        mov     edi, [esi+ehci_controller.MMIOBase2-sizeof.ehci_controller]

        spin_lock_irqsave [esi+usb_controller.WaitSpinlock]

        spin_lock_irqsave [esi+usb_controller.WaitSpinlock]

        mov     eax, [edi+EhciStatusReg]

        mov     eax, [edi+EhciStatusReg]

;       DEBUGF 1,'K : [%d] EHCI status %x\n',[timer_ticks],eax

;       DEBUGF 1,'K : [%d] EHCI status %x\n',[timer_ticks],eax

; 3. Check whether that interrupt has been generated by our controller.

; 3. Check whether that interrupt has been generated by our controller.

; (One IRQ can be shared by several devices.)

; (One IRQ can be shared by several devices.)

        and     eax, [edi+EhciInterruptReg]

        and     eax, [edi+EhciInterruptReg]

        jz      .noint

        jz      .noint

; 4. Clear the events we know of.

; 4. Clear the events we know of.

; Note that this should be done before processing of events:

; Note that this should be done before processing of events:

; new events could arise while we are processing those, this way we won't lose

; new events could arise while we are processing those, this way we won't lose

; them (the controller would generate another interrupt after completion

; them (the controller would generate another interrupt after completion

; of this one).

; of this one).

;       DEBUGF 1,'K : EHCI interrupt: status = %x\n',eax

;       DEBUGF 1,'K : EHCI interrupt: status = %x\n',eax

        mov     [edi+EhciStatusReg], eax

        mov     [edi+EhciStatusReg], eax

; 5. Sanity check.

; 5. Sanity check.

        test    al, 10h

        test    al, 10h

        jz      @f

        jz      @f