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#ifndef Z80IRQ_H
#define Z80IRQ_H
#include "compiler.h"
#include "z80.h"
typedef int (*irq_func) (struct z80_irq * irq);
struct z80_irq {
irq_func intack;
irq_func eoi;
void *pvt; /* Available for user */
int16_t vector; /* Available for user if intack defined */
uint8_t prio; /* Priority level */
bool handled; /* In handler (between INTACK and EOI) */
};
#define IRQ(prio, intack, eoi, pvt) \
{ (intack), (eoi), (pvt), -1, (prio), false }
#define MAX_IRQ 32
extern atomic_uint irq_pending;
extern unsigned int irq_mask; /* 0 = inside handler (irq->handled == true) */
static inline bool poll_irq(void)
{
return unlikely(irq_pending & irq_mask);
}
void z80_register_irq(struct z80_irq *irq);
int z80_intack(void);
void z80_eoi(void);
static inline void z80_interrupt(struct z80_irq *irq)
{
atomic_fetch_or(&irq_pending, 1U << irq->prio);
}
static inline void z80_clear_interrupt(struct z80_irq *irq)
{
atomic_fetch_and(&irq_pending, ~(1U << irq->prio));
}
#endif /* Z80IRQ_H */
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