1 files changed, 123 insertions, 0 deletions
diff --git a/cpukit/include/rtems/dev/io.h b/cpukit/include/rtems/dev/io.h
new file mode 100644
index 0000000000..b8bcde7af4
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+++ b/cpukit/include/rtems/dev/io.h
@@ -0,0 +1,123 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSDeviceIO
+ *
+ * @brief This header file provides the interfaces of the
+ *   @ref RTEMSDeviceIO.
+ */
+
+/*
+ * Copyright (C) 2017, 2023 embedded brains GmbH & Co. KG
+ *
+ * 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.
+ */
+
+#ifndef _RTEMS_DEV_IO_H
+#define _RTEMS_DEV_IO_H
+
+#include <rtems/score/basedefs.h>
+
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * @defgroup RTEMSDeviceIO Device I/O Support
+ *
+ * @ingroup RTEMSDeviceDrivers
+ *
+ * @brief This group contains the Device I/O Support API and implementation.
+ *
+ * @{
+ */
+
+/**
+ * @brief This type defines the put character handler.
+ *
+ * @param c is the character to put.
+ *
+ * @param arg is the user-provided argument.
+ */
+typedef void ( *IO_Put_char )( int c, void *arg );
+
+/**
+ * @brief Prints characters using the put character handler according to the
+ *   format string.
+ *
+ * @param put_char is the put character handler.
+ *
+ * @param arg is the user-provided argument for the put character handler.
+ *
+ * @param fmt is the printf()-style format string.
+ *
+ * @param ... is the list of parameters required by the format string.
+ *
+ * @return Returns the count of put characters.
+ */
+int _IO_Printf(
+  IO_Put_char  put_char,
+  void        *arg,
+  char const  *fmt,
+  ...
+) RTEMS_PRINTFLIKE( 3, 4 );
+
+/**
+ * @brief Prints characters using the put character handler according to the
+ *   format string.
+ *
+ * @param put_char is the put character handler.
+ *
+ * @param arg is the user-provided argument for the put character handler.
+ *
+ * @param fmt is the printf()-style format string.
+ *
+ * @param ap is the argument list required by the format string.
+ *
+ * @return Returns the count of put characters.
+ */
+int _IO_Vprintf(
+  IO_Put_char  put_char,
+  void        *arg,
+  char const  *fmt,
+  va_list      ap
+);
+
+/**
+ * @brief Issues a couple of no-operation instructions.
+ *
+ * This function may be used to burn a couple of processor cycles with minimum
+ * impact on the system bus.  It may be used in busy wait loops.
+ */
+void _IO_Relax( void );
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* _RTEMS_DEV_IO_H */