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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100// 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/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/of_clk.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_SMPunsigned 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
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(); }}