diff options
-rw-r--r-- | cpukit/include/rtems/score/io.h | 8 | ||||
-rw-r--r-- | cpukit/score/src/iorelax.c | 53 | ||||
-rw-r--r-- | spec/build/cpukit/librtemscpu.yml | 1 | ||||
-rw-r--r-- | spec/build/testsuites/validation/libvalidation.yml | 1 | ||||
-rw-r--r-- | testsuites/validation/tx-io-relax.c | 67 |
5 files changed, 130 insertions, 0 deletions
diff --git a/cpukit/include/rtems/score/io.h b/cpukit/include/rtems/score/io.h index 7fe69841e8..9cd401eb1d 100644 --- a/cpukit/include/rtems/score/io.h +++ b/cpukit/include/rtems/score/io.h @@ -133,6 +133,14 @@ 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 diff --git a/cpukit/score/src/iorelax.c b/cpukit/score/src/iorelax.c new file mode 100644 index 0000000000..1b155377a9 --- /dev/null +++ b/cpukit/score/src/iorelax.c @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @ingroup RTEMSScoreIO + * + * @brief This source file contains the implementation of _IO_Relax(). + */ + +/* + * 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. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <rtems/score/io.h> +#include <rtems/score/cpuimpl.h> + +void _IO_Relax( void ) +{ + _CPU_Instruction_no_operation(); + _CPU_Instruction_no_operation(); + _CPU_Instruction_no_operation(); + _CPU_Instruction_no_operation(); + _CPU_Instruction_no_operation(); + _CPU_Instruction_no_operation(); + _CPU_Instruction_no_operation(); + _CPU_Instruction_no_operation(); +} diff --git a/spec/build/cpukit/librtemscpu.yml b/spec/build/cpukit/librtemscpu.yml index a1f614a1d9..3654e7f94a 100644 --- a/spec/build/cpukit/librtemscpu.yml +++ b/spec/build/cpukit/librtemscpu.yml @@ -1434,6 +1434,7 @@ 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 diff --git a/spec/build/testsuites/validation/libvalidation.yml b/spec/build/testsuites/validation/libvalidation.yml index 9b326b89d2..f73b0f771a 100644 --- a/spec/build/testsuites/validation/libvalidation.yml +++ b/spec/build/testsuites/validation/libvalidation.yml @@ -14,6 +14,7 @@ source: - testsuites/validation/tx-call-within-isr.c - testsuites/validation/tx-default-task-config.c - testsuites/validation/tx-interrupt.c +- testsuites/validation/tx-io-relax.c - testsuites/validation/tx-memory-alloc.c - testsuites/validation/tx-preemption-intervention.c - testsuites/validation/tx-support.c diff --git a/testsuites/validation/tx-io-relax.c b/testsuites/validation/tx-io-relax.c new file mode 100644 index 0000000000..30cc097b3a --- /dev/null +++ b/testsuites/validation/tx-io-relax.c @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @ingroup RTEMSTestSuitesValidation + * + * @brief This source file contains the implementation of SetIORelaxHandler(). + */ + +/* + * 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. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "tx-support.h" + +void __real__IO_Relax( void ); + +void __wrap__IO_Relax( void ); + +static void ( *io_relax_handler )( void * ); + +static void *io_relax_arg; + +void __wrap__IO_Relax( void ) +{ + void ( *handler )( void * ); + + handler = io_relax_handler; + + if ( handler != NULL ) { + ( *handler )( io_relax_arg ); + } + + __real__IO_Relax(); +} + +void SetIORelaxHandler( void ( *handler )( void * ), void *arg ) +{ + io_relax_handler = handler; + io_relax_arg = arg; +} |