score: Move _IO_Relax() to new <rtems/dev/io.h>

This function is not a super core service.

bsps/shared/grlib/uart/apbuart_polled.c

@@ -38,7 +38,7 @@
 #include <grlib/apbuart.h>
 #include <grlib/io.h>
 
-#include <rtems/score/io.h>
+#include <rtems/dev/io.h>
 
 void apbuart_outbyte_wait( const apbuart *regs )
 {

cpukit/dev/iorelax.c

@@ -3,7 +3,7 @@
 /**
  * @file
  *
- * @ingroup RTEMSScoreIO
+ * @ingroup RTEMSDeviceIO
  *
  * @brief This source file contains the implementation of _IO_Relax().
  */
@@ -37,7 +37,7 @@
 #include "config.h"
 #endif
 
-#include <rtems/score/io.h>
+#include <rtems/dev/io.h>
 #include <rtems/score/cpuimpl.h>
 
 void _IO_Relax( void )

cpukit/include/rtems/dev/io.h

@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSDeviceIO
+ *
+ * @brief This header file provides the interfaces of the
+ *   @ref RTEMSDeviceIO.
+ */
+
+/*
+ * Copyright (C) 2021 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
+
+#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 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 */

cpukit/include/rtems/score/io.h

@@ -133,14 +133,6 @@ int _IO_Base64url(
   int          wordlen
 );
 
-/**
- * @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

spec/build/cpukit/librtemscpu.yml

@@ -528,6 +528,7 @@ source:
 - cpukit/compression/xz/xz_crc32.c
 - cpukit/compression/xz/xz_dec_lzma2.c
 - cpukit/compression/xz/xz_dec_stream.c
+- cpukit/dev/can/can.c
 - cpukit/dev/flash/flashdev.c
 - cpukit/dev/i2c/eeprom.c
 - cpukit/dev/i2c/fpga-i2c-slave.c
@@ -540,10 +541,10 @@ source:
 - cpukit/dev/i2c/ti-lm25066a.c
 - cpukit/dev/i2c/ti-tmp112.c
 - cpukit/dev/i2c/xilinx-axi-i2c.c
+- cpukit/dev/iorelax.c
 - cpukit/dev/serial/sc16is752-spi.c
 - cpukit/dev/serial/sc16is752.c
 - cpukit/dev/spi/spi-bus.c
-- cpukit/dev/can/can.c
 - cpukit/dtc/libfdt/fdt.c
 - cpukit/dtc/libfdt/fdt_addresses.c
 - cpukit/dtc/libfdt/fdt_empty_tree.c
@@ -1434,7 +1435,6 @@ source:
 - cpukit/score/src/interr.c
 - cpukit/score/src/iobase64.c
 - cpukit/score/src/ioprintf.c
-- cpukit/score/src/iorelax.c
 - cpukit/score/src/iovprintf.c
 - cpukit/score/src/isr.c
 - cpukit/score/src/isrisinprogress.c