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