1 files changed, 96 insertions, 0 deletions
diff --git a/roms/skiboot/include/timebase.h b/roms/skiboot/include/timebase.h
new file mode 100644
index 000000000..07967e2b2
--- /dev/null
+++ b/roms/skiboot/include/timebase.h
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+/*
+ * Timebase helpers.
+ *
+ * Note: Only use after the TODs are in sync !
+ *
+ * Copyright 2013-2016 IBM Corp.
+ */
+
+#ifndef __TIME_H
+#define __TIME_H
+
+#include <time.h>
+
+#ifndef __TEST__
+static inline unsigned long mftb(void)
+{
+	unsigned long tb;
+
+	/* We use a memory clobber to avoid this being
+	 * moved in the instruction stream
+	 */
+	asm volatile("mftb %0" : "=r"(tb) : : "memory");
+	return tb;
+}
+#endif
+
+enum tb_cmpval {
+	TB_ABEFOREB = -1,
+	TB_AEQUALB  = 0,
+	TB_AAFTERB  = 1
+};
+
+static inline enum tb_cmpval tb_compare(unsigned long a,
+					unsigned long b)
+{
+	if (a == b)
+		return TB_AEQUALB;
+	return ((long)(b - a)) > 0 ? TB_ABEFOREB : TB_AAFTERB;
+}
+
+/* Architected timebase */
+extern unsigned long tb_hz;
+
+static inline unsigned long secs_to_tb(unsigned long secs)
+{
+	return secs * tb_hz;
+}
+
+static inline unsigned long tb_to_secs(unsigned long tb)
+{
+	return tb / tb_hz;
+}
+
+static inline unsigned long tb_remaining_nsecs(unsigned long tb)
+{
+	return tb % tb_hz;
+}
+
+static inline unsigned long msecs_to_tb(unsigned long msecs)
+{
+	return msecs * (tb_hz / 1000);
+}
+
+static inline unsigned long tb_to_msecs(unsigned long tb)
+{
+	return (tb * 1000) / tb_hz;
+}
+
+static inline unsigned long usecs_to_tb(unsigned long usecs)
+{
+	return usecs * (tb_hz / 1000000);
+}
+
+static inline unsigned long tb_to_usecs(unsigned long tb)
+{
+	return (tb * 1000000) / tb_hz;
+}
+
+extern unsigned long timespec_to_tb(const struct timespec *ts);
+
+/* time_wait - Wait a certain number of TB ticks while polling FSP */
+extern void time_wait(unsigned long duration);
+extern void time_wait_nopoll(unsigned long duration);
+
+/* time_wait_ms - Wait a certain number of milliseconds while polling FSP */
+extern void time_wait_ms(unsigned long ms);
+extern void time_wait_ms_nopoll(unsigned long ms);
+
+/* time_wait_us - Wait a certain number of microseconds while polling FSP */
+extern void time_wait_us(unsigned long us);
+extern void time_wait_us_nopoll(unsigned long us);
+
+/* nanosleep_nopoll - variant for use from hostservices */
+extern int nanosleep_nopoll(const struct timespec *req, struct timespec *rem);
+#endif /* __TIME_H */