irq.h (2109B)
1 #ifndef QEMU_IRQ_H 2 #define QEMU_IRQ_H 3 4 /* Generic IRQ/GPIO pin infrastructure. */ 5 6 #define TYPE_IRQ "irq" 7 8 void qemu_set_irq(qemu_irq irq, int level); 9 10 static inline void qemu_irq_raise(qemu_irq irq) 11 { 12 qemu_set_irq(irq, 1); 13 } 14 15 static inline void qemu_irq_lower(qemu_irq irq) 16 { 17 qemu_set_irq(irq, 0); 18 } 19 20 static 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 */ 29 qemu_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 */ 35 qemu_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 */ 40 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler, 41 void *opaque, int n); 42 43 void qemu_free_irqs(qemu_irq *s, int n); 44 void qemu_free_irq(qemu_irq irq); 45 46 /* Returns a new IRQ with opposite polarity. */ 47 qemu_irq qemu_irq_invert(qemu_irq irq); 48 49 /* For internal use in qtest. Similar to qemu_irq_split, but operating 50 on an existing vector of qemu_irq. */ 51 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n); 52 53 /** 54 * qemu_irq_is_connected: Return true if IRQ line is wired up 55 * 56 * If a qemu_irq has a device on the other (receiving) end of it, 57 * return true; otherwise return false. 58 * 59 * Usually device models don't need to care whether the machine model 60 * has wired up their outbound qemu_irq lines, because functions like 61 * qemu_set_irq() silently do nothing if there is nothing on the other 62 * end of the line. However occasionally a device model will want to 63 * provide default behaviour if its output is left floating, and 64 * it can use this function to identify when that is the case. 65 */ 66 static inline bool qemu_irq_is_connected(qemu_irq irq) 67 { 68 return irq != NULL; 69 } 70 71 #endif