Linux Cache Operation & Address Conversion

====== Linux Cache Operation ======
 
| opt | Term | API |
| 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) |

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 |
|