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File Content: `gettimeofday.h`

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2018 ARM Limited
 */
#ifndef __ASM_VDSO_GETTIMEOFDAY_H
#define __ASM_VDSO_GETTIMEOFDAY_H

#ifndef __ASSEMBLY__

#include <asm/unistd.h>
#include <uapi/linux/time.h>

#include <asm/vdso/clocksource.h>

#define __VDSO_USE_SYSCALL		ULLONG_MAX

#define VDSO_HAS_CLOCK_GETRES		1

static __always_inline
int gettimeofday_fallback(struct __kernel_old_timeval *_tv,
			  struct timezone *_tz)
{
	register struct timezone *tz asm("x1") = _tz;
	register struct __kernel_old_timeval *tv asm("x0") = _tv;
	register long ret asm ("x0");
	register long nr asm("x8") = __NR_gettimeofday;

	asm volatile(
	"       svc #0\n"
	: "=r" (ret)
	: "r" (tv), "r" (tz), "r" (nr)
	: "memory");

	return ret;
}

static __always_inline
long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
{
	register struct __kernel_timespec *ts asm("x1") = _ts;
	register clockid_t clkid asm("x0") = _clkid;
	register long ret asm ("x0");
	register long nr asm("x8") = __NR_clock_gettime;

	asm volatile(
	"       svc #0\n"
	: "=r" (ret)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "memory");

	return ret;
}

static __always_inline
int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
{
	register struct __kernel_timespec *ts asm("x1") = _ts;
	register clockid_t clkid asm("x0") = _clkid;
	register long ret asm ("x0");
	register long nr asm("x8") = __NR_clock_getres;

	asm volatile(
	"       svc #0\n"
	: "=r" (ret)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "memory");

	return ret;
}

static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
{
	u64 res;

	/*
	 * clock_mode != NONE implies that vDSO are enabled otherwise
	 * fallback on syscall.
	 */
	if (clock_mode == VDSO_CLOCKMODE_NONE)
		return __VDSO_USE_SYSCALL;

	/*
	 * This isb() is required to prevent that the counter value
	 * is speculated.
	 */
	isb();
	asm volatile("mrs %0, cntvct_el0" : "=r" (res) :: "memory");
	arch_counter_enforce_ordering(res);

	return res;
}

static __always_inline
const struct vdso_data *__arch_get_vdso_data(void)
{
	return _vdso_data;
}

#endif /* !__ASSEMBLY__ */

#endif /* __ASM_VDSO_GETTIMEOFDAY_H */

Name	Size	Permission
clocksource.h	359 bytes	0644
compat_barrier.h	954 bytes	0644
compat_gettimeofday.h	4157 bytes	0644
gettimeofday.h	2165 bytes	0644
vsyscall.h	1115 bytes	0644

File Content: gettimeofday.h

File Content: `gettimeofday.h`