root/include/linux/htirq.h

#ifndef LINUX_HTIRQ_H
#define LINUX_HTIRQ_H

struct ht_irq_msg {
        u32     address_lo;     /* low 32 bits of the ht irq message */
        u32     address_hi;     /* high 32 bits of the it irq message */
};

/* Helper functions.. */
void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
struct irq_data;
void mask_ht_irq(struct irq_data *data);
void unmask_ht_irq(struct irq_data *data);

/* The arch hook for getting things started */
int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev);

/* For drivers of buggy hardware */
typedef void (ht_irq_update_t)(struct pci_dev *dev, int irq,
                               struct ht_irq_msg *msg);
int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update);

#endif /* LINUX_HTIRQ_H */