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85 lines
3.3 KiB
C
85 lines
3.3 KiB
C
/******************************************************************************
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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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