[Xen-devel] [RFC XEN PATCH 12/23] riscv: Add time.c

[Bobby Eshleman <bobbyeshleman@xxxxxxxxx>]

From: Alistair Francis <alistair.francis@xxxxxxx>

Signed-off-by: Alistair Francis <alistair.francis@xxxxxxx>
---
 xen/arch/riscv/time.c | 74 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 xen/arch/riscv/time.c

diff --git a/xen/arch/riscv/time.c b/xen/arch/riscv/time.c
new file mode 100644
index 0000000000..5358a22bd7
--- /dev/null
+++ b/xen/arch/riscv/time.c
@@ -0,0 +1,74 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <xen/console.h>
+#include <xen/init.h>
+#include <xen/irq.h>
+#include <xen/lib.h>
+#include <xen/mm.h>
+#include <xen/softirq.h>
+#include <xen/sched.h>
+#include <xen/time.h>
+#include <xen/sched.h>
+#include <xen/event.h>
+#include <xen/cpu.h>
+#include <xen/notifier.h>
+#include <asm/system.h>
+#include <asm/time.h>
+
+unsigned long __read_mostly cpu_khz;  /* CPU clock frequency in kHz. */
+
+uint64_t __read_mostly boot_count;
+
+s_time_t ticks_to_ns(uint64_t ticks)
+{
+    return muldiv64(ticks, SECONDS(1), 1000 * cpu_khz);
+}
+
+void __init preinit_xen_time(void)
+{
+    if ( !cpu_khz )
+        cpu_khz = 1000;
+
+    boot_count = get_cycles();
+}
+
+s_time_t get_s_time(void)
+{
+    uint64_t ticks = get_cycles() - boot_count;
+    return ticks_to_ns(ticks);
+}
+
+
+/* VCPU PV timers. */
+void send_timer_event(struct vcpu *v)
+{
+    send_guest_vcpu_virq(v, VIRQ_TIMER);
+}
+
+/* VCPU PV clock. */
+void update_vcpu_system_time(struct vcpu *v)
+{
+    /* XXX update shared_info->wc_* */
+}
+
+void domain_set_time_offset(struct domain *d, int64_t time_offset_seconds)
+{
+    d->time_offset_seconds = time_offset_seconds;
+}
+
+int reprogram_timer(s_time_t timeout)
+{
+    /* TODO */
+
+    return 0;
+}
-- 
2.25.0


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