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Bahadir Balban
2008-01-13 13:53:52 +00:00
commit e2b791a3d8
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80
include/l4/generic/irq.h Normal file
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/*
* Generic irq handling definitions.
*
* Copyright (C) 2007 Bahadir Balban
*/
#ifndef __GENERIC_IRQ_H__
#define __GENERIC_IRQ_H__
#include <l4/lib/string.h>
#include INC_PLAT(irq.h)
/* Represents none or spurious irq */
#define IRQ_NIL (-1)
/* Successful irq handling state */
#define IRQ_HANDLED 0
typedef void (*irq_op_t)(int irq);
struct irq_chip_ops {
void (*init)(void);
int (*read_irq)(void);
irq_op_t ack_and_mask;
irq_op_t unmask;
};
struct irq_chip {
char name[32];
int level; /* Cascading level */
int cascade; /* The irq that lower chip uses on this chip */
int offset; /* The global offset for this irq chip */
struct irq_chip_ops ops;
};
typedef int (*irq_handler_t)(void);
struct irq_desc {
char name[8];
struct irq_chip *chip;
/* TODO: This could be a list for multiple handlers */
irq_handler_t handler;
};
extern struct irq_desc irq_desc_array[];
extern struct irq_chip irq_chip_array[];
static inline void irq_enable(int irq_index)
{
struct irq_desc *this_irq = irq_desc_array + irq_index;
struct irq_chip *this_chip = this_irq->chip;
this_chip->ops.unmask(irq_index - this_chip->offset);
}
static inline void irq_disable(int irq_index)
{
struct irq_desc *this_irq = irq_desc_array + irq_index;
struct irq_chip *this_chip = this_irq->chip;
this_chip->ops.ack_and_mask(irq_index - this_chip->offset);
}
static inline void register_irq(char *name, int irq_index, irq_handler_t handler)
{
struct irq_desc *this_desc = irq_desc_array + irq_index;
struct irq_chip *current_chip = irq_chip_array;
strncpy(&this_desc->name[0], name, sizeof(this_desc->name));
for (int i = 0; i < IRQ_CHIPS_MAX; i++)
if (irq_index <= current_chip->offset) {
this_desc->chip = current_chip;
break;
}
this_desc->handler = handler;
}
void do_irq(void);
void irq_controllers_init(void);
#endif /* __GENERIC_IRQ_H__ */