Contributors: 24
Author Tokens Token Proportion Commits Commit Proportion
Marc Zyngier 74 21.70% 1 2.94%
Catalin Marinas 48 14.08% 1 2.94%
Sebastian Hesselbarth 34 9.97% 1 2.94%
Zwane Mwaikambo 32 9.38% 1 2.94%
Deepak Saxena 24 7.04% 2 5.88%
Arnd Bergmann 22 6.45% 2 5.88%
Russell King 22 6.45% 7 20.59%
Linus Torvalds (pre-git) 20 5.87% 2 5.88%
David Brownell 12 3.52% 1 2.94%
Martin Schwidefsky 12 3.52% 1 2.94%
Thomas Gleixner 6 1.76% 2 5.88%
Benjamin Gaignard 6 1.76% 1 2.94%
Kevin Hilman 5 1.47% 1 2.94%
Nikolay Borisov 5 1.47% 1 2.94%
Xunlei Pang 3 0.88% 1 2.94%
Linus Torvalds 3 0.88% 1 2.94%
Anton Blanchard 3 0.88% 1 2.94%
Nadia Yvette Chambers 2 0.59% 1 2.94%
Frederik Deweerdt 2 0.59% 1 2.94%
Alexey Dobriyan 2 0.59% 1 2.94%
Daniel Lezcano 1 0.29% 1 2.94%
Atsushi Nemoto 1 0.29% 1 2.94%
Stephen Warren 1 0.29% 1 2.94%
Torben Hohn 1 0.29% 1 2.94%
Total 341 34 


// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/kernel/time.c
 *
 *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
 *  Modifications for ARM (C) 1994-2001 Russell King
 *
 *  This file contains the ARM-specific time handling details:
 *  reading the RTC at bootup, etc...
 */
#include <linux/clk-provider.h>
#include <linux/clockchips.h>
#include <linux/clocksource.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/sched_clock.h>
#include <linux/smp.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/timer.h>

#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/stacktrace.h>
#include <asm/thread_info.h>

#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || \
    defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE)
/* this needs a better home */
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
#endif	/* pc-style 'CMOS' RTC support */

/* change this if you have some constant time drift */
#define USECS_PER_JIFFY	(1000000/HZ)

#ifdef CONFIG_SMP
unsigned long profile_pc(struct pt_regs *regs)
{
	struct stackframe frame;

	if (!in_lock_functions(regs->ARM_pc))
		return regs->ARM_pc;

	arm_get_current_stackframe(regs, &frame);
	do {
		int ret = unwind_frame(&frame);
		if (ret < 0)
			return 0;
	} while (in_lock_functions(frame.pc));

	return frame.pc;
}
EXPORT_SYMBOL(profile_pc);
#endif

#ifndef CONFIG_GENERIC_CLOCKEVENTS
/*
 * Kernel system timer support.
 */
void timer_tick(void)
{
	profile_tick(CPU_PROFILING);
	xtime_update(1);
#ifndef CONFIG_SMP
	update_process_times(user_mode(get_irq_regs()));
#endif
}
#endif

static void dummy_clock_access(struct timespec64 *ts)
{
	ts->tv_sec = 0;
	ts->tv_nsec = 0;
}

static clock_access_fn __read_persistent_clock = dummy_clock_access;

void read_persistent_clock64(struct timespec64 *ts)
{
	__read_persistent_clock(ts);
}

int __init register_persistent_clock(clock_access_fn read_persistent)
{
	/* Only allow the clockaccess functions to be registered once */
	if (__read_persistent_clock == dummy_clock_access) {
		if (read_persistent)
			__read_persistent_clock = read_persistent;
		return 0;
	}

	return -EINVAL;
}

void __init time_init(void)
{
	if (machine_desc->init_time) {
		machine_desc->init_time();
	} else {
#ifdef CONFIG_COMMON_CLK
		of_clk_init(NULL);
#endif
		timer_probe();
		tick_setup_hrtimer_broadcast();
	}
}