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mywiki:linux:cache

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mywiki:linux:cache [2016/01/29 14:04] – supermywiki:linux:cache [2019/09/15 18:55] (current) – external edit 127.0.0.1
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-Linux Cache Operation+Linux Cache Operation & Address Conversion
  
 +====== Linux Cache Operation ======
 + 
 | opt | Term | API | | opt | Term | API |
-| Invalidate | stale data problem | dma_cache_inv(unsigned long address unsigned long size) |+| Invalidate | stale data problem | **dma_cache_inv**(unsigned long address unsigned long size) |
 | Flush/write back | any dirty cache | dma_cache_wback/**dma_cache_wback_inv**(unsigned long address, unsigned long size) | | Flush/write back | any dirty cache | dma_cache_wback/**dma_cache_wback_inv**(unsigned long address, unsigned long size) |
  
 Note: For dma_cache_wback, in theory, for write back caches an invalidate kills the cache line only without actually writing the data out, thus destroying the data in the cache. A safer thing to do in this case is issue a flush and invalidate instruction Note: For dma_cache_wback, in theory, for write back caches an invalidate kills the cache line only without actually writing the data out, thus destroying the data in the cache. A safer thing to do in this case is issue a flush and invalidate instruction
  
 +
 +====== Address Conversion ======
 +<include\asm\addrspace.h>
 +
 +| CPHYSADDR | get its physical address |
 +| 
  
  
  
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