LXR qemu/include/hw/irq.h

   1#ifndef QEMU_IRQ_H
   2#define QEMU_IRQ_H
   3
   4/* Generic IRQ/GPIO pin infrastructure.  */
   5
   6#define TYPE_IRQ "irq"
   7
   8void qemu_set_irq(qemu_irq irq, int level);
   9
  10static inline void qemu_irq_raise(qemu_irq irq)
  11{
  12    qemu_set_irq(irq, 1);
  13}
  14
  15static inline void qemu_irq_lower(qemu_irq irq)
  16{
  17    qemu_set_irq(irq, 0);
  18}
  19
  20static inline void qemu_irq_pulse(qemu_irq irq)
  21{
  22    qemu_set_irq(irq, 1);
  23    qemu_set_irq(irq, 0);
  24}
  25
  26/* Returns an array of N IRQs. Each IRQ is assigned the argument handler and
  27 * opaque data.
  28 */
  29qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n);
  30
  31/*
  32 * Allocates a single IRQ. The irq is assigned with a handler, an opaque
  33 * data and the interrupt number.
  34 */
  35qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n);
  36
  37/* Extends an Array of IRQs. Old IRQs have their handlers and opaque data
  38 * preserved. New IRQs are assigned the argument handler and opaque data.
  39 */
  40qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
  41                                void *opaque, int n);
  42
  43void qemu_free_irqs(qemu_irq *s, int n);
  44void qemu_free_irq(qemu_irq irq);
  45
  46/* Returns a new IRQ with opposite polarity.  */
  47qemu_irq qemu_irq_invert(qemu_irq irq);
  48
  49/* Returns a new IRQ which feeds into both the passed IRQs.
  50 * It's probably better to use the TYPE_SPLIT_IRQ device instead.
  51 */
  52qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2);
  53
  54/* For internal use in qtest.  Similar to qemu_irq_split, but operating
  55   on an existing vector of qemu_irq.  */
  56void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n);
  57
  58/**
  59 * qemu_irq_is_connected: Return true if IRQ line is wired up
  60 *
  61 * If a qemu_irq has a device on the other (receiving) end of it,
  62 * return true; otherwise return false.
  63 *
  64 * Usually device models don't need to care whether the machine model
  65 * has wired up their outbound qemu_irq lines, because functions like
  66 * qemu_set_irq() silently do nothing if there is nothing on the other
  67 * end of the line. However occasionally a device model will want to
  68 * provide default behaviour if its output is left floating, and
  69 * it can use this function to identify when that is the case.
  70 */
  71static inline bool qemu_irq_is_connected(qemu_irq irq)
  72{
  73    return irq != NULL;
  74}
  75
  76#endif
  77