libtest: Add T_busy()

Update #3199.

2 files changed, 61 insertions, 17 deletions

diff --git a/cpukit/libtest/t-test-busy.c b/cpukit/libtest/t-test-busy.c
new file mode 100644
index 0000000000..3bf149b8bb
--- /dev/null
+++ b/cpukit/libtest/t-test-busy.c
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSTestFrameworkImpl
+ *
+ * @brief Implementation of T_busy().
+ */
+
+/*
+ * Copyright (C) 2014, 2020 embedded brains GmbH (http://www.embedded-brains.de)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/test.h>
+
+/*
+ * It is important that we actually use the same T_busy() function at the
+ * various places.  So, the compiler must not inline this function.  Take care
+ * of link time optimization.
+ */
+__attribute__((__noinline__)) void
+T_busy(uint_fast32_t count)
+{
+	uint_fast32_t i;
+
+	i = 0;
+
+	do {
+		__asm__ volatile ("");
+		++i;
+	} while (i < count);
+}
diff --git a/cpukit/libtest/testbusy.c b/cpukit/libtest/testbusy.c
index e5218b0112..bf11b11632 100644
--- a/cpukit/libtest/testbusy.c
+++ b/cpukit/libtest/testbusy.c
@@ -19,6 +19,7 @@
 
 #include <rtems/test-info.h>
 #include <rtems.h>
+#include <rtems/test.h>
 #include <rtems/score/threadimpl.h>
 
 static uint_fast32_t estimate_busy_loop_maximum( void )
@@ -45,21 +46,6 @@ static uint_fast32_t wait_for_tick_change( void )
   return now;
 }
 
-/*
- * It is important that we use actually use the same rtems_test_busy() function
- * at the various places, since otherwise the obtained maximum value might be
- * wrong.  So, the compiler must not inline this function.
- */
-RTEMS_NO_INLINE void rtems_test_busy( uint_fast32_t count )
-{
-  uint_fast32_t i = 0;
-
-  do {
-    __asm__ volatile ("");
-    ++i;
-  } while ( i < count );
-}
-
 uint_fast32_t rtems_test_get_one_tick_busy_count( void )
 {
   uint_fast32_t last;
@@ -78,7 +64,7 @@ uint_fast32_t rtems_test_get_one_tick_busy_count( void )
 
   while ( true ) {
     last = wait_for_tick_change();
-    rtems_test_busy( b );
+    T_busy( b );
     now = rtems_clock_get_ticks_since_boot();
 
     if ( now != last ) {
@@ -94,7 +80,7 @@ uint_fast32_t rtems_test_get_one_tick_busy_count( void )
     m = ( a + b ) / 2;
 
     last = wait_for_tick_change();
-    rtems_test_busy( m );
+    T_busy( m );
     now = rtems_clock_get_ticks_since_boot();
 
     if ( now != last ) {