Prototype

typedef enum {
  EfiGcdIoTypeNonExistent,
  EfiGcdIoTypeReserved,
  EfiGcdIoTypeIo,
  EfiGcdIoTypeMaximum
} EFI_GCD_IO_TYPE;

Description

Member	Description
EfiGcdIoTypeNonExistent	An I/O region that is visible to the boot processor. However, there are no system components that are currently decoding this I/O region.
EfiGcdIoTypeReserved	An I/O region that is visible to the boot processor. This I/O region is currently being decoded by a system component, but the I/O region cannot be used to access I/O devices.
EfiGcdIoTypeIo	An I/O region that is visible to the boot processor. This I/O region is currently being decoded by a system component that is producing I/O ports that can be used to access I/O devices.