[qemu.git] / target / s390x / s390-tod.h

/*
 * TOD (Time Of Day) clock
 *
 * Copyright 2018 Red Hat, Inc.
 * Author(s): David Hildenbrand <[email protected]>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#ifndef TARGET_S390_TOD_H
#define TARGET_S390_TOD_H

/* The value of the TOD clock for 1.1.1970. */
#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL

/* Converts ns to s390's clock format */
static inline uint64_t time2tod(uint64_t ns)
{
    return (ns << 9) / 125 + (((ns & 0xff80000000000000ull) / 125) << 9);
}

/* Converts s390's clock format to ns */
static inline uint64_t tod2time(uint64_t t)
{
    return ((t >> 9) * 125) + (((t & 0x1ff) * 125) >> 9);
}

#endif
Commit	Line	Data
4037c39b RH	1	/*
	2	* TOD (Time Of Day) clock
	3	*
	4	* Copyright 2018 Red Hat, Inc.
	5	* Author(s): David Hildenbrand <[email protected]>
	6	*
	7	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	8	* See the COPYING file in the top-level directory.
	9	*/
	10
	11	#ifndef TARGET_S390_TOD_H
	12	#define TARGET_S390_TOD_H
	13
	14	/* The value of the TOD clock for 1.1.1970. */
	15	#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
	16
	17	/* Converts ns to s390's clock format */
	18	static inline uint64_t time2tod(uint64_t ns)
	19	{
	20	return (ns << 9) / 125 + (((ns & 0xff80000000000000ull) / 125) << 9);
	21	}
	22
	23	/* Converts s390's clock format to ns */
	24	static inline uint64_t tod2time(uint64_t t)
	25	{
	26	return ((t >> 9) * 125) + (((t & 0x1ff) * 125) >> 9);
	27	}
	28
	29	#endif