Table of Contents Shell Requirements Table Requirements System Table Boot Services Runtime Services Protocol Dependancy Required Optional Reduced Feature Optional Command Dependant

The shell is explicitly defined as a UEFI 2.1+ Application. That means that is has a requirement on a completed system table and many protocols. The shell will use features only found in UEFI 2.3+ (such as SimpleTextInputEx), but will function with a reduced feature set without these features. Note that these reductions in functionality may make the the shell non-spec compliant.

The shell uses many functions found on the System Table or sub-tables.

• EFI Table Header
• ConsoleInHandle
• ConIn
• ConsoleOutHandle
• ConOut
• StandardErrorHandle
• StdErr

All major sections of this table are used.

• Event, Timer, and Task Priority Services
• Memory Allocation Services
• Protocol Handler Services
• Image Services
• Miscelaneous Boot Services

Many sections of this table are used.

• Variable Services
• Time Services
• Miscelaneous Runtime Services

The shell uses many UEFI standard protocols to perform.

• gEfiSimpleTextInProtocolGuid
• gEfiSimpleTextOutProtocolGuid
• gEfiSimpleFileSystemProtocolGuid
• gEfiLoadedImageProtocolGuid
• gEfiComponentName2ProtocolGuid
• gEfiUnicodeCollation2ProtocolGuid
• gEfiDevicePathProtocolGuid
• gEfiDevicePathToTextProtocolGuid
• gEfiPciRootBridgeIoProtocolGuid
• gEfiBlockIoProtocolGuid

These are used for shell nesting operations, but are not required by the first shell instance.

• gEfiShellProtocolGuid
• gEfiShellParametersProtocolGuid

Lacking these protocols will reduce the feature set.

• gEfiSimpleTextInputExProtocolGuid

The main shell and some commands will function without these. Some commands may not function.

• gEfiSimplePointerProtocolGuid
• gEfiDriverHealthProtocolGuid
• gEfiDriverFamilyOverrideProtocolGuid
• gEfiHiiConfigAccessProtocolGuid
• gEfiHiiDatabaseProtocolGuid
• gEfiCpuArchProtocolGuid
• gEfiIp6ProtocolGuid
• gEfiIp6ServiceBindingProtocolGuid
• gEfiIp6ConfigProtocolGuid