diff options
Diffstat (limited to 'arch/arm64/kernel/time.c')
-rw-r--r-- | arch/arm64/kernel/time.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c new file mode 100644 index 000000000..eebbc8d71 --- /dev/null +++ b/arch/arm64/kernel/time.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Based on arch/arm/kernel/time.c + * + * Copyright (C) 1991, 1992, 1995 Linus Torvalds + * Modifications for ARM (C) 1994-2001 Russell King + * Copyright (C) 2012 ARM Ltd. + */ + +#include <linux/clockchips.h> +#include <linux/export.h> +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/time.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/smp.h> +#include <linux/timex.h> +#include <linux/errno.h> +#include <linux/profile.h> +#include <linux/syscore_ops.h> +#include <linux/timer.h> +#include <linux/irq.h> +#include <linux/delay.h> +#include <linux/clocksource.h> +#include <linux/of_clk.h> +#include <linux/acpi.h> + +#include <clocksource/arm_arch_timer.h> + +#include <asm/thread_info.h> +#include <asm/stacktrace.h> +#include <asm/paravirt.h> + +unsigned long profile_pc(struct pt_regs *regs) +{ + struct stackframe frame; + + if (!in_lock_functions(regs->pc)) + return regs->pc; + + start_backtrace(&frame, regs->regs[29], regs->pc); + + do { + int ret = unwind_frame(NULL, &frame); + if (ret < 0) + return 0; + } while (in_lock_functions(frame.pc)); + + return frame.pc; +} +EXPORT_SYMBOL(profile_pc); + +void __init time_init(void) +{ + u32 arch_timer_rate; + + of_clk_init(NULL); + timer_probe(); + + tick_setup_hrtimer_broadcast(); + + arch_timer_rate = arch_timer_get_rate(); + if (!arch_timer_rate) + panic("Unable to initialise architected timer.\n"); + + /* Calibrate the delay loop directly */ + lpj_fine = arch_timer_rate / HZ; + + pv_time_init(); +} |