From 3d0620b607ff6459fec9d30efc1e0589bbd010f9 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Wed, 8 Apr 2020 16:54:34 +0200 Subject: score: Optimize Workspace Handler initialization The BSPs provide memory for the workspace initialization via _Memory_Get(). Most BSPs provide exactly one memory area. Only two BSPs provide more than one memory area (arm/altera-cyclone-v and bsps/powerpc/mpc55xxevb). Only if more than one memory area is provided, there is a need to use _Heap_Extend(). Provide two implementations to initialize the workspace handler and let the BSP select one of the implementations based on the number of provided memory areas. This gets rid of a dependency on _Heap_Extend(). It also avoids dead code sections for most BSPs. --- cpukit/include/rtems/score/wkspaceinitone.h | 113 ++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 cpukit/include/rtems/score/wkspaceinitone.h (limited to 'cpukit/include/rtems/score/wkspaceinitone.h') diff --git a/cpukit/include/rtems/score/wkspaceinitone.h b/cpukit/include/rtems/score/wkspaceinitone.h new file mode 100644 index 0000000000..c68e1b5db1 --- /dev/null +++ b/cpukit/include/rtems/score/wkspaceinitone.h @@ -0,0 +1,113 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @ingroup RTEMSScoreWorkspace + * + * @brief This header file provides the implementation of + * _Workspace_Initialize_for_one_area(). + */ + +/* + * Copyright (C) 2012, 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. + */ + +#ifndef _RTEMS_SCORE_WKSPACEINITONE_H +#define _RTEMS_SCORE_WKSPACEINITONE_H + +#include +#include +#include +#include +#include +#include + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @ingroup RTEMSScoreWorkspace + * + * @brief Initializes the RTEMS Workspace with support for exactly one memory + * area. + * + * This implementation should be used by BSPs which provide exactly one memory + * area via _Memory_Get() to implement _Workspace_Handler_initialization(). + */ +RTEMS_INLINE_ROUTINE void _Workspace_Initialize_for_one_area( void ) +{ + uintptr_t page_size; + uintptr_t wkspace_size; + uintptr_t wkspace_size_with_overhead; + uintptr_t available_size; + + page_size = CPU_HEAP_ALIGNMENT; + wkspace_size = rtems_configuration_get_work_space_size(); + wkspace_size_with_overhead = wkspace_size + _Heap_Area_overhead( page_size ); + + if ( wkspace_size < wkspace_size_with_overhead ) { + const Memory_Information *mem; + Memory_Area *area; + uintptr_t free_size; + uintptr_t size; + + mem = _Memory_Get(); + _Assert( _Memory_Get_count( mem ) == 1 ); + + area = _Memory_Get_area( mem, 0 ); + free_size = _Memory_Get_free_size( area ); + + if ( rtems_configuration_get_unified_work_area() ) { + size = free_size; + } else { + size = wkspace_size_with_overhead; + } + + available_size = _Heap_Initialize( + &_Workspace_Area, + _Memory_Get_free_begin( area ), + size, + page_size + ); + + _Memory_Consume( area, size ); + } else { + /* An unsigned integer overflow happened */ + available_size = 0; + } + + if ( wkspace_size > available_size ) { + _Internal_error( INTERNAL_ERROR_TOO_LITTLE_WORKSPACE ); + } + + _Heap_Protection_set_delayed_free_fraction( &_Workspace_Area, 1 ); +} + +#ifdef __cplusplus +} +#endif + +#endif /* _RTEMS_SCORE_WKSPACEINITONE_H */ -- cgit v1.2.3