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Dir : //proc/self/root/usr/include/linux/hpet.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __HPET__
#define __HPET__




struct hpet_info {
	unsigned long hi_ireqfreq;	/* Hz */
	unsigned long hi_flags;	/* information */
	unsigned short hi_hpet;
	unsigned short hi_timer;
};

#define HPET_INFO_PERIODIC	0x0010	/* periodic-capable comparator */

#define	HPET_IE_ON	_IO('h', 0x01)	/* interrupt on */
#define	HPET_IE_OFF	_IO('h', 0x02)	/* interrupt off */
#define	HPET_INFO	_IOR('h', 0x03, struct hpet_info)
#define	HPET_EPI	_IO('h', 0x04)	/* enable periodic */
#define	HPET_DPI	_IO('h', 0x05)	/* disable periodic */
#define	HPET_IRQFREQ	_IOW('h', 0x6, unsigned long)	/* IRQFREQ usec */

#define MAX_HPET_TBS	8		/* maximum hpet timer blocks */

#endif /* __HPET__ */