Intel Extensible Firmware Interface - Manual (Page 208)

Extensible Firmware Interface Specification
6-16 12/01/02 Version 1.10
6.3 Virtual Memory Services
This section contains function definitions for the virtual memory support that may be optionally
used by an operating system at runtime. If an operating system chooses to make EFI runtime
service calls in a virtual addressing mode instead of the flat physical mode, then the operating
system must use the services in this section to switch the EFI runtime services from flat physical
addressing to virtual addressing. Table 6-3 lists the virtual memory service functions described in
this section. The system firmware must follow the processor-specific rules outlined in sections
2.3.2 and 2.3.3 in the layout of the EFI memory map to enable the OS to make the required virtual
mappings.
Table 6-3. Virtual Memory Functions
Name Type Description
SetVirtualAddressMap Runtime Used by an OS loader to convert from physical addressing to virtual
addressing.
ConvertPointer Runtime Used by EFI components to convert internal pointers when switching
to virtual addressing.