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https://github.com/marqs85/ossc
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78 lines
3.8 KiB
C
78 lines
3.8 KiB
C
/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2003,2007 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 <malloc.h>
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#include "sys/alt_warning.h"
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#include "sys/alt_cache.h"
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#include "system.h"
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/*
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* Allocate a block of uncached memory.
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* Return pointer to the block of memory or NULL if can't allocate it.
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*/
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volatile void*
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alt_uncached_malloc(size_t size)
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{
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#if ALT_CPU_DCACHE_SIZE > 0
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#ifdef ALT_CPU_DCACHE_BYPASS_MASK
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void* ptr;
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/* Round up size to an integer number of data cache lines. Required to guarantee that
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* cacheable and non-cacheable data won't be mixed on the same cache line. */
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const size_t num_lines = (size + ALT_CPU_DCACHE_LINE_SIZE - 1) / ALT_CPU_DCACHE_LINE_SIZE;
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const size_t aligned_size = num_lines * ALT_CPU_DCACHE_LINE_SIZE;
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/* Use memalign() Newlib routine to allocate starting on a data cache aligned address.
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* Required to guarantee that cacheable and non-cacheable data won't be mixed on the
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* same cache line. */
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ptr = memalign(ALT_CPU_DCACHE_LINE_SIZE, aligned_size);
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if (ptr == NULL) {
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return NULL; /* Out of memory */
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}
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/* Ensure that the memory region isn't in the data cache. */
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alt_dcache_flush(ptr, aligned_size);
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return (volatile void*) (((alt_u32)ptr) | ALT_CPU_DCACHE_BYPASS_MASK);
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#else /* No address mask option enabled. */
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/* Generate a link time error, should this function ever be called. */
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ALT_LINK_ERROR("alt_uncached_malloc() is not available because CPU is not configured to use bit 31 of address to bypass data cache");
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return NULL;
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#endif /* No address mask option enabled. */
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#else /* No data cache */
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/* Just use regular malloc. */
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return malloc(size);
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#endif /* No data cache */
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}
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