91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
/*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/* for now: just dummy functions to satisfy the linker */
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#include <common.h>
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#include <malloc.h>
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/*
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* Flush range from all levels of d-cache/unified-cache.
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* Affects the range [start, start + size - 1].
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*/
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__weak void flush_cache(unsigned long start, unsigned long size)
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{
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flush_dcache_range(start, start + size);
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}
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/*
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* Default implementation:
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* do a range flush for the entire range
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*/
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__weak void flush_dcache_all(void)
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{
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flush_cache(0, ~0);
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}
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/*
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* Default implementation of enable_caches()
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* Real implementation should be in platform code
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*/
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__weak void enable_caches(void)
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{
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puts("WARNING: Caches not enabled\n");
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}
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__weak void invalidate_dcache_range(unsigned long start, unsigned long stop)
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{
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/* An empty stub, real implementation should be in platform code */
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}
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__weak void flush_dcache_range(unsigned long start, unsigned long stop)
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{
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/* An empty stub, real implementation should be in platform code */
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}
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#ifdef CONFIG_SYS_NONCACHED_MEMORY
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/*
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* Reserve one MMU section worth of address space below the malloc() area that
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* will be mapped uncached.
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*/
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static unsigned long noncached_start;
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static unsigned long noncached_end;
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static unsigned long noncached_next;
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void noncached_init(void)
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{
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phys_addr_t start, end;
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size_t size;
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end = ALIGN(mem_malloc_start, MMU_SECTION_SIZE) - MMU_SECTION_SIZE;
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size = ALIGN(CONFIG_SYS_NONCACHED_MEMORY, MMU_SECTION_SIZE);
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start = end - size;
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debug("mapping memory %pa-%pa non-cached\n", &start, &end);
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noncached_start = start;
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noncached_end = end;
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noncached_next = start;
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#ifndef CONFIG_SYS_DCACHE_OFF
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mmu_set_region_dcache_behaviour(noncached_start, size, DCACHE_OFF);
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#endif
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}
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phys_addr_t noncached_alloc(size_t size, size_t align)
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{
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phys_addr_t next = ALIGN(noncached_next, align);
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if (next >= noncached_end || (noncached_end - next) < size)
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return 0;
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debug("allocated %zu bytes of uncached memory @%pa\n", size, &next);
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noncached_next = next + size;
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return next;
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}
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#endif /* CONFIG_SYS_NONCACHED_MEMORY */
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