diff options
Diffstat (limited to 'nuttx/fs/fat/fs_fat32.h')
| -rw-r--r-- | nuttx/fs/fat/fs_fat32.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/nuttx/fs/fat/fs_fat32.h b/nuttx/fs/fat/fs_fat32.h index 5b82ff701..c7fa5219c 100644 --- a/nuttx/fs/fat/fs_fat32.h +++ b/nuttx/fs/fat/fs_fat32.h @@ -48,6 +48,7 @@ #include <semaphore.h> #include <time.h> +#include <nuttx/kmalloc.h> #include <nuttx/fs/dirent.h> /**************************************************************************** @@ -677,6 +678,33 @@ #endif /**************************************************************************** + * Name: fat_io_alloc and fat_io_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. + * + ****************************************************************************/ + +#ifdef CONFIG_FAT_DMAMEMORY +# define fat_io_alloc(s) fat_dma_alloc(s) +# define fat_io_free(s) fat_dma_free(s) +#else +# define fat_io_alloc(s) kmalloc(s) +# define fat_io_free(s) kfree(s) +#endif + +/**************************************************************************** * Public Types ****************************************************************************/ |