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Extensible Firmware Interface Specification
11-42 12/01/02 Version 1.10
WriteBlocks Writes the requested number of blocks to the device. See the
WriteBlocks()
function description.
FlushBlocks Flushes and cache blocks. This function is optional and only
needs to be supported on block devices that cache writes. See
the FlushBlocks()
function description.
Related Definitions
//*******************************************************
// EFI_BLOCK_IO_MEDIA
//*******************************************************
typedef struct {
UINT32 MediaId;
BOOLEAN RemovableMedia;
BOOLEAN MediaPresent;
BOOLEAN LogicalPartition;
BOOLEAN ReadOnly;
BOOLEAN WriteCaching;
UINT32 BlockSize;
UINT32 IoAlign;
EFI_LBA LastBlock;
} EFI_BLOCK_IO_MEDIA;
//*******************************************************
// EFI_LBA
//*******************************************************
typedef UINT64 EFI_LBA;
The following data values in EFI_BLOCK_IO_MEDIA are read-only and are updated by the
code that produces the EFI_BLOCK_IO protocol functions:
MediaId The current media ID. If the media changes, this value is
changed.
RemovableMedia TRUE if the media is removable; otherwise, FALSE.
MediaPresent TRUE if there is a media currently present in the device;
otherwise, FALSE. This field shows the media present status as
of the most recent ReadBlocks()
or WriteBlocks() call.
LogicalPartition TRUE if LBA 0 is the first block of a partition; otherwise
FALSE. For media with only one partition this would be TRUE.