114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
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* Copyright (c) 2013-2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief Cache manipulation
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*
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* This module contains functions for manipulation caches.
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*/
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <misc/util.h>
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#include <toolchain.h>
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#include <cache.h>
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#include <cache_private.h>
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#if defined(CONFIG_CLFLUSH_INSTRUCTION_SUPPORTED) || \
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defined(CONFIG_CLFLUSH_DETECT)
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#if (CONFIG_CACHE_LINE_SIZE == 0) && !defined(CONFIG_CACHE_LINE_SIZE_DETECT)
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#error Cannot use this implementation with a cache line size of 0
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#endif
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/**
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*
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* @brief Flush cache lines to main memory
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*
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* No alignment is required for either <virt> or <size>, but since
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* sys_cache_flush() iterates on the cache lines, a cache line alignment for
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* both is optimal.
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*
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* The cache line size is specified either via the CONFIG_CACHE_LINE_SIZE
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* kconfig option or it is detected at runtime.
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*
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* @return N/A
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*/
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_sys_cache_flush_sig(_cache_flush_clflush)
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{
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int end;
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size = ROUND_UP(size, sys_cache_line_size);
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end = virt + size;
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for (; virt < end; virt += sys_cache_line_size) {
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__asm__ volatile("clflush %0;\n\t" : : "m"(virt));
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}
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__asm__ volatile("mfence;\n\t");
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}
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#endif /* CONFIG_CLFLUSH_INSTRUCTION_SUPPORTED || CLFLUSH_DETECT */
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#if defined(CONFIG_CLFLUSH_DETECT) || defined(CONFIG_CACHE_LINE_SIZE_DETECT)
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#include <init.h>
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#if defined(CONFIG_CLFLUSH_DETECT)
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_sys_cache_flush_t *sys_cache_flush;
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static void init_cache_flush(void)
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{
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if (_is_clflush_available()) {
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sys_cache_flush = _cache_flush_clflush;
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} else {
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sys_cache_flush = _cache_flush_wbinvd;
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}
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}
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#else
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#define init_cache_flush() do { } while ((0))
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#if defined(CONFIG_CLFLUSH_INSTRUCTION_SUPPORTED)
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FUNC_ALIAS(_cache_flush_clflush, sys_cache_flush, void);
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#endif
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#endif /* CONFIG_CLFLUSH_DETECT */
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#if defined(CONFIG_CACHE_LINE_SIZE_DETECT)
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size_t sys_cache_line_size;
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static void init_cache_line_size(void)
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{
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sys_cache_line_size = _cache_line_size_get();
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}
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#else
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#define init_cache_line_size() do { } while ((0))
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#endif
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static int init_cache(struct device *unused)
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{
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ARG_UNUSED(unused);
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init_cache_flush();
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init_cache_line_size();
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return 0;
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}
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SYS_INIT(init_cache, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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#endif /* CONFIG_CLFLUSH_DETECT || CONFIG_CACHE_LINE_SIZE_DETECT */
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