src/include/gpxe/blockdev.h

   1 #ifndef _GPXE_BLOCKDEV_H
   2 #define _GPXE_BLOCKDEV_H
   3
   4 /**
   5  * @file
   6  *
   7  * Block devices
   8  *
   9  */
  10
  11 FILE_LICENCE ( GPL2_OR_LATER );
  12
  13 #include <gpxe/uaccess.h>
  14
  15 struct block_device;
  16
  17 /** Block device operations */
  18 struct block_device_operations {
  19         /**
  20          * Read block
  21          *
  22          * @v blockdev  Block device
  23          * @v block     Block number
  24          * @v count     Block count
  25          * @v buffer    Data buffer
  26          * @ret rc      Return status code
  27          */
  28         int ( * read ) ( struct block_device *blockdev, uint64_t block,
  29                          unsigned long count, userptr_t buffer );
  30         /**
  31          * Write block
  32          *
  33          * @v blockdev  Block device
  34          * @v block     Block number
  35          * @v count     Block count
  36          * @v buffer    Data buffer
  37          * @ret rc      Return status code
  38          */
  39         int ( * write ) ( struct block_device *blockdev, uint64_t block,
  40                           unsigned long count, userptr_t buffer );
  41 };
  42
  43 /** A block device */
  44 struct block_device {
  45         /** Block device operations */
  46         struct block_device_operations *op;
  47         /** Block size */
  48         size_t blksize;
  49         /** Total number of blocks */
  50         uint64_t blocks;
  51 };
  52
  53 #endif /* _GPXE_BLOCKDEV_H */