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[/] [ao486/] [trunk/] [syn/] [components/] [sd_card/] [firmware/] [bsp/] [HAL/] [src/] [alt_icache_flush.c] - Blame information for rev 8

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1 8 alfik
/******************************************************************************
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*                                                                             *
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* License Agreement                                                           *
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*                                                                             *
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* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
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* All rights reserved.                                                        *
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*                                                                             *
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* Permission is hereby granted, free of charge, to any person obtaining a     *
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* copy of this software and associated documentation files (the "Software"),  *
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* to deal in the Software without restriction, including without limitation   *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
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* and/or sell copies of the Software, and to permit persons to whom the       *
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* Software is furnished to do so, subject to the following conditions:        *
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*                                                                             *
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* The above copyright notice and this permission notice shall be included in  *
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* all copies or substantial portions of the Software.                         *
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*                                                                             *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
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* DEALINGS IN THE SOFTWARE.                                                   *
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*                                                                             *
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* This agreement shall be governed in all respects by the laws of the State   *
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* of California and by the laws of the United States of America.              *
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*                                                                             *
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******************************************************************************/
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#include "nios2.h"
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#include "system.h"
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#include "alt_types.h"
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#include "sys/alt_cache.h" 
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/*
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 * alt_icache_flush() is called to flush the instruction cache for a memory
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 * region of length "len" bytes, starting at address "start".
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 */
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void alt_icache_flush (void* start, alt_u32 len)
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{
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#if NIOS2_ICACHE_SIZE > 0
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  char* i;
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  char* end;
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  /*
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   * This is the most we would ever need to flush.
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   */
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  if (len > NIOS2_ICACHE_SIZE)
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  {
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    len = NIOS2_ICACHE_SIZE;
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  }
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  end = ((char*) start) + len;
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  for (i = start; i < end; i+= NIOS2_ICACHE_LINE_SIZE)
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  {
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    __asm__ volatile ("flushi %0" :: "r" (i));
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  }
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  /*
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   * For an unaligned flush request, we've got one more line left.
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   * Note that this is dependent on NIOS2_ICACHE_LINE_SIZE to be a
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   * multiple of 2 (which it always is).
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   */
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  if (((alt_u32) start) & (NIOS2_ICACHE_LINE_SIZE - 1))
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  {
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    __asm__ volatile ("flushi %0" :: "r" (i));
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  }
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  /*
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   * Having flushed the cache, flush any stale instructions in the
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   * pipeline
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   */
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  __asm__ volatile ("flushp");
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#endif /* NIOS2_ICACHE_SIZE > 0 */
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}

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