Intel Extensible Firmware Interface - Manual (Page 763)

Protocols — Device I/O Protocol
Version 1.10 12/01/02 18-3
Unmap Releases any resources allocated by Map() . See the Unmap() function
description.
AllocateBuffer Allocates pages that are suitable for a common buffer mapping. See the
AllocateBuffer() function description.
Flush Flushes any posted write data to the device. See the Flush() function
description.
FreeBuffer Free pages that were allocated with AllocateBuffer() . See the
FreeBuffer() function description.
Related Definitions
//*******************************************************
// EFI_IO_WIDTH
//*******************************************************
typedef enum {
IO_UINT8 = 0,
IO_UINT16 = 1,
IO_UINT32 = 2,
IO_UINT64 = 3
} EFI_IO_WIDTH;
//*******************************************************
// EFI_DEVICE_IO
//*******************************************************
typedef
EFI_STATUS
(EFIAPI *EFI_DEVICE_IO) (
IN struct _EFI_DEVICE_IO_INTERFACE *This,
IN EFI_IO_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
);
//*******************************************************
// EFI_IO_ACCESS
//*******************************************************
typedef struct {
EFI_DEVICE_IO Read;
EFI_DEVICE_IO Write;
} EFI_IO_ACCESS;