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--- mywiki:linux:cache [2016/01/29 13:59] – created super
+++ mywiki:linux:cache [2019/09/15 18:55] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-Linux Cache Operation
+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 |
+|
-| Invalidate | stale data problem | dma_cache_inv(unsigned long address unsigned long size) |
-| Flush/write back | any dirty cache |  dma_cache_wback(unsigned long address, unsigned long size) \\  dma_cache_wback_inv(unsigned long address, unsigned long size) |