e7bd34a15b
This reworks the cache mode configuration in Kconfig, and allows for explicit selection of write-back/write-through/off configurations. All of the cache flushing routines are optimized away for the off case. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
#ifndef __ASM_SH_CACHEFLUSH_H
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#define __ASM_SH_CACHEFLUSH_H
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#ifdef __KERNEL__
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#ifdef CONFIG_CACHE_OFF
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/*
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* Nothing to do when the cache is disabled, initial flush and explicit
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* disabling is handled at CPU init time.
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*
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* See arch/sh/kernel/cpu/init.c:cache_init().
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*/
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#define p3_cache_init() do { } while (0)
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#define flush_cache_all() do { } while (0)
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#define flush_cache_mm(mm) do { } while (0)
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#define flush_cache_dup_mm(mm) do { } while (0)
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#define flush_cache_range(vma, start, end) do { } while (0)
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#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
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#define flush_dcache_page(page) do { } while (0)
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#define flush_icache_range(start, end) do { } while (0)
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#define flush_icache_page(vma,pg) do { } while (0)
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#define flush_dcache_mmap_lock(mapping) do { } while (0)
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#define flush_dcache_mmap_unlock(mapping) do { } while (0)
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#define flush_cache_sigtramp(vaddr) do { } while (0)
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#define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
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#define __flush_wback_region(start, size) do { (void)(start); } while (0)
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#define __flush_purge_region(start, size) do { (void)(start); } while (0)
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#define __flush_invalidate_region(start, size) do { (void)(start); } while (0)
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#else
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#include <asm/cpu/cacheflush.h>
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/*
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* Consistent DMA requires that the __flush_xxx() primitives must be set
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* for any of the enabled non-coherent caches (most of the UP CPUs),
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* regardless of PIPT or VIPT cache configurations.
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*/
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/* Flush (write-back only) a region (smaller than a page) */
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extern void __flush_wback_region(void *start, int size);
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/* Flush (write-back & invalidate) a region (smaller than a page) */
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extern void __flush_purge_region(void *start, int size);
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/* Flush (invalidate only) a region (smaller than a page) */
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extern void __flush_invalidate_region(void *start, int size);
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#endif
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#define flush_cache_vmap(start, end) flush_cache_all()
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#define flush_cache_vunmap(start, end) flush_cache_all()
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#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
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do { \
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flush_cache_page(vma, vaddr, page_to_pfn(page));\
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memcpy(dst, src, len); \
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flush_icache_user_range(vma, page, vaddr, len); \
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} while (0)
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#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
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do { \
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flush_cache_page(vma, vaddr, page_to_pfn(page));\
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memcpy(dst, src, len); \
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} while (0)
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#define HAVE_ARCH_UNMAPPED_AREA
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_CACHEFLUSH_H */
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