/**
* @file
*
* @ingroup RTEMSScoreMemory
*
* @brief This source file contains the implementation of
* _Memory_Allocate().
*/
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (C) 2018, 2019 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/memory.h>
void *_Memory_Allocate(
const Memory_Information *information,
uintptr_t size,
uintptr_t alignment
)
{
Memory_Area *area;
const Memory_Area *end;
uintptr_t alignment_mask;
area = &information->areas[ 0 ];
end = &information->areas[ information->count ];
alignment_mask = alignment - 1;
while ( area != end ) {
uintptr_t alloc_begin;
uintptr_t alloc_end;
alloc_begin = (uintptr_t) area->free;
alloc_begin += alignment_mask;
alloc_begin &= ~alignment_mask;
alloc_end = alloc_begin + size;
if ( alloc_begin <= alloc_end && alloc_end <= (uintptr_t) area->end ) {
area->free = (void *) alloc_end;
return (void *) alloc_begin;
}
++area;
}
return NULL;
}
