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rtx/rt_MemBox.c
- Committer:
- emilmont
- Date:
- 2012-11-23
- Revision:
- 6:350b53afb889
File content as of revision 6:350b53afb889:
/*---------------------------------------------------------------------------- * RL-ARM - RTX *---------------------------------------------------------------------------- * Name: RT_MEMBOX.C * Purpose: Interface functions for fixed memory block management system * Rev.: V4.60 *---------------------------------------------------------------------------- * * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH * All rights reserved. * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - 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. * - Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without * specific prior written permission. * * 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 COPYRIGHT HOLDERS AND 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. *---------------------------------------------------------------------------*/ #include "rt_TypeDef.h" #include "RTX_Config.h" #include "rt_System.h" #include "rt_MemBox.h" #include "rt_HAL_CM.h" /*---------------------------------------------------------------------------- * Global Functions *---------------------------------------------------------------------------*/ /*--------------------------- _init_box -------------------------------------*/ int _init_box (void *box_mem, U32 box_size, U32 blk_size) { /* Initialize memory block system, returns 0 if OK, 1 if fails. */ void *end; void *blk; void *next; U32 sizeof_bm; /* Create memory structure. */ if (blk_size & BOX_ALIGN_8) { /* Memory blocks 8-byte aligned. */ blk_size = ((blk_size & ~BOX_ALIGN_8) + 7) & ~7; sizeof_bm = (sizeof (struct OS_BM) + 7) & ~7; } else { /* Memory blocks 4-byte aligned. */ blk_size = (blk_size + 3) & ~3; sizeof_bm = sizeof (struct OS_BM); } if (blk_size == 0) { return (1); } if ((blk_size + sizeof_bm) > box_size) { return (1); } /* Create a Memory structure. */ blk = ((U8 *) box_mem) + sizeof_bm; ((P_BM) box_mem)->free = blk; end = ((U8 *) box_mem) + box_size; ((P_BM) box_mem)->end = end; ((P_BM) box_mem)->blk_size = blk_size; /* Link all free blocks using offsets. */ end = ((U8 *) end) - blk_size; while (1) { next = ((U8 *) blk) + blk_size; if (next > end) break; *((void **)blk) = next; blk = next; } /* end marker */ *((void **)blk) = 0; return (0); } /*--------------------------- rt_alloc_box ----------------------------------*/ void *rt_alloc_box (void *box_mem) { /* Allocate a memory block and return start address. */ void **free; #ifndef __USE_EXCLUSIVE_ACCESS int irq_dis; irq_dis = __disable_irq (); free = ((P_BM) box_mem)->free; if (free) { ((P_BM) box_mem)->free = *free; } if (!irq_dis) __enable_irq (); #else do { if ((free = (void **)__ldrex(&((P_BM) box_mem)->free)) == 0) { __clrex(); break; } } while (__strex((U32)*free, &((P_BM) box_mem)->free)); #endif return (free); } /*--------------------------- _calloc_box -----------------------------------*/ void *_calloc_box (void *box_mem) { /* Allocate a 0-initialized memory block and return start address. */ void *free; U32 *p; U32 i; free = _alloc_box (box_mem); if (free) { p = free; for (i = ((P_BM) box_mem)->blk_size; i; i -= 4) { *p = 0; p++; } } return (free); } /*--------------------------- rt_free_box -----------------------------------*/ int rt_free_box (void *box_mem, void *box) { /* Free a memory block, returns 0 if OK, 1 if box does not belong to box_mem */ #ifndef __USE_EXCLUSIVE_ACCESS int irq_dis; #endif if (box < box_mem || box >= ((P_BM) box_mem)->end) { return (1); } #ifndef __USE_EXCLUSIVE_ACCESS irq_dis = __disable_irq (); *((void **)box) = ((P_BM) box_mem)->free; ((P_BM) box_mem)->free = box; if (!irq_dis) __enable_irq (); #else do { *((void **)box) = (void *)__ldrex(&((P_BM) box_mem)->free); } while (__strex ((U32)box, &((P_BM) box_mem)->free)); #endif return (0); } /*---------------------------------------------------------------------------- * end of file *---------------------------------------------------------------------------*/