https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: c095ba7224d8edc71dcef0d655911399a8bd4a3f authored by Linus Torvalds on 04 August 2013, 20:46:46 UTC
Linux 3.11-rc4
Linux 3.11-rc4
Tip revision: c095ba7
arch_timer.c
/*
* linux/arch/arm/kernel/arch_timer.c
*
* Copyright (C) 2011 ARM Ltd.
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/sched_clock.h>
#include <asm/delay.h>
#include <clocksource/arm_arch_timer.h>
static unsigned long arch_timer_read_counter_long(void)
{
return arch_timer_read_counter();
}
static u32 sched_clock_mult __read_mostly;
static unsigned long long notrace arch_timer_sched_clock(void)
{
return arch_timer_read_counter() * sched_clock_mult;
}
static struct delay_timer arch_delay_timer;
static void __init arch_timer_delay_timer_register(void)
{
/* Use the architected timer for the delay loop. */
arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
arch_delay_timer.freq = arch_timer_get_rate();
register_current_timer_delay(&arch_delay_timer);
}
int __init arch_timer_arch_init(void)
{
u32 arch_timer_rate = arch_timer_get_rate();
if (arch_timer_rate == 0)
return -ENXIO;
arch_timer_delay_timer_register();
/* Cache the sched_clock multiplier to save a divide in the hot path. */
sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
sched_clock_func = arch_timer_sched_clock;
pr_info("sched_clock: ARM arch timer >56 bits at %ukHz, resolution %uns\n",
arch_timer_rate / 1000, sched_clock_mult);
return 0;
}