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+.. SPDX-License-Identifier: GPL-2.0+
+
+UEFI subsystem
+==============
+
+Lauching UEFI images
+--------------------
+
+Bootefi command
+~~~~~~~~~~~~~~~
+
+The bootefi command is used to start UEFI applications or to install UEFI
+drivers. It takes two parameters
+
+    bootefi <image address> [fdt address]
+
+* image address - the memory address of the UEFI binary
+* fdt address - the memory address of the flattened device tree
+
+The environment variable 'bootargs' is passed as load options in the UEFI system
+table. The Linux kernel EFI stub uses the load options as command line
+arguments.
+
+.. kernel-doc:: cmd/bootefi.c
+   :internal:
+
+Boot manager
+~~~~~~~~~~~~
+
+The UEFI specification foresees to define boot entries and boot sequence via UEFI
+variables. Booting according to these variables is possible via
+
+    bootefi bootmgr [fdt address]
+
+* fdt address - the memory address of the flattened device tree
+
+The relevant variables are:
+
+* Boot0000-BootFFFF define boot entries
+* BootNext specifies next boot option to be booted
+* BootOrder specifies in which sequence the boot options shall be tried if
+  BootNext is not defined or booting via BootNext fails
+
+.. kernel-doc:: lib/efi_loader/efi_bootmgr.c
+   :internal:
+
+Efidebug command
+~~~~~~~~~~~~~~~~
+
+The efidebug command is used to set and display boot options as well as to
+display information about internal data of the UEFI subsystem (devices,
+drivers, handles, loaded images, and the memory map).
+
+.. kernel-doc:: cmd/efidebug.c
+   :internal:
+
+Initialization of the UEFI sub-system
+-------------------------------------
+
+.. kernel-doc:: lib/efi_loader/efi_setup.c
+   :internal:
+
+Boot services
+-------------
+
+.. kernel-doc:: lib/efi_loader/efi_boottime.c
+   :internal:
+
+Image relocation
+~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: lib/efi_loader/efi_image_loader.c
+   :internal:
+
+Memory services
+~~~~~~~~~~~~~~~
+
+.. kernel-doc:: lib/efi_loader/efi_memory.c
+   :internal:
+
+Runtime services
+----------------
+
+.. kernel-doc:: lib/efi_loader/efi_runtime.c
+   :internal:
+
+Variable services
+~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: lib/efi_loader/efi_variable.c
+   :internal:
+
+UEFI drivers
+------------
+
+UEFI driver uclass
+~~~~~~~~~~~~~~~~~~
+.. kernel-doc:: lib/efi_driver/efi_uclass.c
+   :internal:
+
+Block device driver
+~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: lib/efi_driver/efi_block_device.c
+   :internal: