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Extensible Firmware Interface Specification
K-2 12/01/02 Version 1.10
Table K-1. Functions Listed in Alphabetic Order (continued)
Function Name Service or Protocol
Subservice Function Description
CalculateCrc32 Boot Services Miscellaneous
Services
Computes and returns a 32-bit
CRC for a data buffer.
Callback PXE Base Code
Callback Protocol
Callback routine used by the PXE
Base Code Dhcp(),
Discover()
, Mtftp(),
UdpWrite()
, and Arp()
functions.
CheckEvent Boot Services Event Services Checks whether an event is in the
signaled state.
ClearRootHubPortFeature USB Host Controller
Protocol
Clears the feature for the specified
root hub port.
ClearScreen Simple Text Output
Protocol
Clears the screen with the
currently set background color.
Close File System Protocol
Closes the current file handle.
CloseEvent Boot Services Event Services Closes and frees an event
structure.
CloseProtocol Boot Services Protocol Handler
Services
Removes elements from the list of
agents consuming a protocol
interface.
Configuration PCI Root Bridge I/O
Protocol
Gets the current resource settings
for this PCI root bridge
ConnectController Boot Services Protocol Handler
Services
Uses a set of precedence rules to
find the best set of drivers to
manage a controller.
ControlTransfer USB Host Controller
Protocol
Submits a control transfer to a
target USB device.
ConvertPointer Runtime Services Virtual Memory
Services
Converts internal pointers when
switching to virtual addressing.
CopyMem Boot Services Miscellaneous
Services
Copies the contents of one buffer
to another buffer.
CopyMem PCI I/O Protocol Allows one region of PCI memory
space to be copied to another
region of PCI memory space
CopyMem PCI Root Bridge I/O
Protocol
Allows one region of PCI root
bridge memory space to be copied
to another region of PCI root
bridge memory space.
CreateDevice UGA I/O Protocol Dynamically allocate storage for a
child UGA_DEVICE.
CreateEvent Boot Services Event Services Creates a general-purpose event
structure.
continued