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We currently have two implementations of UEFI variables: * variables provided via an OP-TEE module * variables stored in the U-Boot environment Read only variables are up to now only implemented in the U-Boot environment implementation. Provide a common interface for both implementations that allows handling read-only variables. As variable access is limited to very few source files put variable related definitions into new include efi_variable.h instead of efi_loader. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
177 lines
3.6 KiB
ReStructuredText
177 lines
3.6 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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UEFI subsystem
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==============
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Lauching UEFI images
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--------------------
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Bootefi command
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~~~~~~~~~~~~~~~
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The bootefi command is used to start UEFI applications or to install UEFI
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drivers. It takes two parameters
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bootefi <image address> [fdt address]
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* image address - the memory address of the UEFI binary
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* fdt address - the memory address of the flattened device tree
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The environment variable 'bootargs' is passed as load options in the UEFI system
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table. The Linux kernel EFI stub uses the load options as command line
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arguments.
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.. kernel-doc:: cmd/bootefi.c
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:internal:
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Boot manager
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~~~~~~~~~~~~
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The UEFI specification foresees to define boot entries and boot sequence via UEFI
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variables. Booting according to these variables is possible via
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bootefi bootmgr [fdt address]
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* fdt address - the memory address of the flattened device tree
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The relevant variables are:
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* Boot0000-BootFFFF define boot entries
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* BootNext specifies next boot option to be booted
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* BootOrder specifies in which sequence the boot options shall be tried if
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BootNext is not defined or booting via BootNext fails
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.. kernel-doc:: lib/efi_loader/efi_bootmgr.c
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:internal:
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Efidebug command
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~~~~~~~~~~~~~~~~
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The efidebug command is used to set and display boot options as well as to
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display information about internal data of the UEFI subsystem (devices,
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drivers, handles, loaded images, and the memory map).
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.. kernel-doc:: cmd/efidebug.c
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:internal:
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Initialization of the UEFI sub-system
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-------------------------------------
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.. kernel-doc:: lib/efi_loader/efi_setup.c
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:internal:
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Boot services
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-------------
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.. kernel-doc:: lib/efi_loader/efi_boottime.c
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:internal:
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Image relocation
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~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_image_loader.c
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:internal:
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Memory services
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~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_memory.c
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:internal:
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SetWatchdogTimer service
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~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_watchdog.c
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:internal:
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Runtime services
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----------------
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.. kernel-doc:: lib/efi_loader/efi_runtime.c
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:internal:
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Variable services
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~~~~~~~~~~~~~~~~~
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.. kernel-doc:: include/efi_variable.h
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:internal:
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.. kernel-doc:: lib/efi_loader/efi_variable.c
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:internal:
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UEFI drivers
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------------
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UEFI driver uclass
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~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_driver/efi_uclass.c
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:internal:
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Block device driver
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~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_driver/efi_block_device.c
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:internal:
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Protocols
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---------
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Block IO protocol
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~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_disk.c
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:internal:
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File protocol
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~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_file.c
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:internal:
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Graphical output protocol
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~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_gop.c
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:internal:
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Load file 2 protocol
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~~~~~~~~~~~~~~~~~~~~
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The load file 2 protocol can be used by the Linux kernel to load the initial
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RAM disk. U-Boot can be configured to provide an implementation.
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.. kernel-doc:: lib/efi_loader/efi_load_initrd.c
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:internal:
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Network protocols
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~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_net.c
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:internal:
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Random number generator protocol
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_rng.c
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:internal:
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Text IO protocols
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~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_console.c
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:internal:
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Unicode Collation protocol
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: lib/efi_loader/efi_unicode_collation.c
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:internal:
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Unit testing
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------------
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The following library functions are provided to support writing UEFI unit tests.
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The should not be used elsewhere.
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.. kernel-doc:: include/efi_selftest.h
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:internal:
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