Device_io.unmap(), Unmap(), When co – Intel Extensible Firmware Interface User Manual
Page 770
Extensible Firmware Interface Specification
18-10
12/01/02
Version 1.10
DEVICE_IO.Unmap()
Summary
Completes the
operation and releases any corresponding resources.
Prototype
typedef
EFI_STATUS
(EFIAPI *EFI_IO_UNMAP) (
IN EFI_DEVICE_IO_INTERFACE
*This,
IN VOID
*Mapping
);
Parameters
This
A pointer to the
instance. Type
EFI_DEVICE_IO_INTERFACE
is defined in Section 18.2.
Mapping
The mapping value returned from
Map()
.
Description
The
Unmap()
function completes the
Map()
operation and releases any corresponding resources.
If the operation was an
, the data is committed to the target system
memory. Any resources used for the mapping are freed.
Status Codes Returned
EFI_SUCCESS
The range was unmapped.
EFI_DEVICE_ERROR
The data was not committed to the target system memory.