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Extensible Firmware Interface Specification
K-10 12/01/02 Version 1.10
Table K-1. Functions Listed in Alphabetic Order (continued)
Function Name Service or Protocol Subservice Function Description
NVData Simple Network
Protocol
Allows read and writes to the
NVRAM device attached to a
network interface.
NvData UNDI Commands This command is used to read
and write (if supported by NIC
hardware) nonvolatile storage
on the NIC.
Open File System Protocol Opens or creates a new file.
OpenProtocol Boot Services Protocol Handler
Services
Adds elements to the list of agents
consuming a protocol interface.
OpenProtocolInformation Boot Services Protocol Handler
Services
Retrieve the list of agents that are
currently consuming a protocol
interface.
OpenVolume Simple File System
Protocol
Opens the volume for file I/O
access.
OptionsValid EFI Driver
Configuration
Protocol
Tests to see if a controller's
current configuration options are
valid.
OutputString Simple Text Output
Protocol
Displays the Unicode string on the
device at the current cursor
location.
PassThru SCSI Passthru
Protocol
Sends a SCSI Request Packet to
a SCSI device that is connected to
the SCSI channel.
Pci.Read Device I/O Protocol Reads from PCI Configuration
Space.
Pci.Read PCI I/O Protocol Allows PCI controller relative
reads to PCI configuration space.
Pci.Read PCI Root Bridge I/O
Protocol
Allows reads from PCI
configuration space.
Pci.Write Device I/O Protocol Writes to PCI Configuration
Space.
Pci.Write PCI I/O Protocol Allows PCI controller relative
writes to PCI configuration space.
Pci.Write PCI Root Bridge I/O
Protocol
Allows writes to PCI configuration
space
PciDevicePath Device I/O Protocol Provides an EFI Device Path for a
PCI device with the given PCI
configuration space address.
continued