1 files changed, 47 insertions, 0 deletions
diff --git a/roms/skiboot/core/test/run-timebase.c b/roms/skiboot/core/test/run-timebase.c
new file mode 100644
index 000000000..a613609a0
--- /dev/null
+++ b/roms/skiboot/core/test/run-timebase.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+/*
+ * Copyright 2015-2016 IBM Corp.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+
+#define __TEST__
+#include <timebase.h>
+
+unsigned long tb_hz = 512000000;
+
+int main(void)
+{
+	/* This is a fairly solid assumption that the math we're doing
+	 * is based on tb_hz of exactly 512mhz.
+	 * If we do start doing the math on different tb_hz, you probably
+	 * want to go and audit every bit of code that touches tb to
+	 * count/delay things.
+	 */
+	assert(tb_hz == 512000000);
+	assert(secs_to_tb(1) == tb_hz);
+	assert(secs_to_tb(2) == 1024000000);
+	assert(secs_to_tb(10) == 5120000000);
+	assert(tb_to_secs(512000000) == 1);
+	assert(tb_to_secs(5120000000) == 10);
+	assert(tb_to_secs(1024000000) == 2);
+
+	assert(msecs_to_tb(1) == 512000);
+	assert(msecs_to_tb(100) == 51200000);
+	assert(msecs_to_tb(5) == 2560000);
+	assert(tb_to_msecs(512000) == 1);
+
+	assert(usecs_to_tb(5) == 2560);
+	assert(tb_to_usecs(2560) == 5);
+	assert(usecs_to_tb(5)*1000 == msecs_to_tb(5));
+	assert(tb_to_usecs(512000) == 1000);
+
+	assert(tb_compare(msecs_to_tb(5), usecs_to_tb(5)) == TB_AAFTERB);
+	assert(tb_compare(msecs_to_tb(5), usecs_to_tb(50000)) == TB_ABEFOREB);
+	assert(tb_compare(msecs_to_tb(5), usecs_to_tb(5)*1000) == TB_AEQUALB);
+
+	return 0;
+}