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Add support for DMA memory allocator to FAT file system

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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@5127 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo
2012-09-11 13:53:44 +00:00
parent de7764b1d4
commit 648420e67a
7 changed files with 92 additions and 12 deletions
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nuttx/include/nuttx/fs/fat.h
+29 -1
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@@ -75,11 +75,39 @@ extern "C" {
#define EXTERN extern
#endif
/* Non-standard functions to get and set FAT file/directory attributes */
/****************************************************************************
* Name: fat_getattrib and fat_setattrib
*
* Description:
* Non-standard functions to get and set FAT file/directory attributes
*
****************************************************************************/
EXTERN int fat_getattrib(const char *path, fat_attrib_t *attrib);
EXTERN int fat_setattrib(const char *path, fat_attrib_t setbits, fat_attrib_t clearbits);
/****************************************************************************
* Name: fat_dma_alloc and fat_dma_free
*
* Description:
* The FAT file system allocates two I/O buffers for data transfer, each
* are the size of one device sector. One of the buffers is allocated
* once for each FAT volume that is mounted; the other buffers are
* allocated each time a FAT file is opened.
*
* Some hardware, however, may require special DMA-capable memory in
* order to perform the the transfers. If CONFIG_FAT_DMAMEMORY is defined
* then the architecture-specific hardware must provide the funtions
* fat_dma_alloc() and fat_dma_free() as prototyped below: fat_dmalloc()
* will allocate DMA-capable memory of the specified size; fat_dmafree()
* is the corresponding function that will be called to free the DMA-
* capable memory.
*
****************************************************************************/
EXTERN FAR void *fat_dma_alloc(size_t size);
EXTERN void fat_dma_free(FAR void *memory);
#undef EXTERN
#ifdef __cplusplus
}