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();
+}