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-rw-r--r--arch/arm64/kernel/time.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c
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+++ b/arch/arm64/kernel/time.c
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+// 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/stacktrace.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/paravirt.h>
+
+static bool profile_pc_cb(void *arg, unsigned long pc)
+{
+ unsigned long *prof_pc = arg;
+
+ if (in_lock_functions(pc))
+ return true;
+ *prof_pc = pc;
+ return false;
+}
+
+unsigned long profile_pc(struct pt_regs *regs)
+{
+ unsigned long prof_pc = 0;
+
+ arch_stack_walk(profile_pc_cb, &prof_pc, current, regs);
+
+ return prof_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();
+}