[U-Boot] [RFC v3 00/10] efi_loader: rework bootefi/bootmgr

[AKASHI Takahiro]

There are several reasons that I want to rework/refactor bootefi command
as well as bootmgr:
* Some previous commits on bootefi.c have made the code complicated
  and a bit hard to understand.

* do_bootefi_exec() would better be implemented using load_image() along
  with start_image() to be aligned with UEFI interfaces.

* Contrary to the other part, efi_selftest part of the code is unusual
  in terms of loading/execution path in do_bootefi().

* When we will support "secure boot" in the future, EFI Boot Manager
  is expected to be invoked as a standalone command without any arguments
  to mitigate security surfaces.

In this patch set,
Patch#1 to #8 are preparatory patches for patch#9.
Patch#9 is a core part of reworking.
Patch#10 is for standalone boot manager.

# Please note that some patches, say patch#3 and #4, can be combined into one
# but I intentionally keep them separated to clarify my intentions of changes.

Issues:
* The semantics of efi_dp_from_name() should be changed.
  (See FIXME in patch#9.)

-Takahiro Akashi

Changes in RFC v3 (Apr 16, 2019)
* rebased on v2019.04
* delete already-merged patches
* add patch#2 for exporting root node
* use correct/more appropriate return code (CMD_RET_xxx) (patch#3,5,7)
* remove a message at starting an image in bootefi command, instead
  adding a debug message in efi_start_image()
* use root node as a dummy parent handle when calling efi_start_image()
* remove efi_unload_image() in bootefi command

Changes in RFC v2 (Mar 27, 2019)
* rebased on v2019.04-rc4
* use load_image API in do_bootmgr_load()
* merge efi_install_fdt() and efi_process_fdt()
* add EFI_LOADED_IMAGE_DEVICE_PATH_PROTOCOL to image (patch#1)
* lots of minor changes

AKASHI Takahiro (10):
  efi_loader: device_path: handle special case of loading
  efi_loader: export root node handle
  cmd: bootefi: carve out fdt handling from do_bootefi()
  cmd: bootefi: merge efi_install_fdt() and efi_process_fdt()
  cmd: bootefi: carve out efi_selftest code from do_bootefi()
  cmd: bootefi: move do_bootefi_bootmgr_exec() forward
  cmd: bootefi: carve out bootmgr code from do_bootefi()
  cmd: bootefi: carve out do_boot_efi() from do_bootefi()
  efi_loader: rework bootmgr/bootefi using load_image API
  cmd: add efibootmgr command

 cmd/Kconfig                      |   8 +
 cmd/bootefi.c                    | 515 ++++++++++++++++++++-----------
 include/efi_loader.h             |   7 +-
 lib/efi_loader/efi_bootmgr.c     |  43 +--
 lib/efi_loader/efi_boottime.c    |   2 +
 lib/efi_loader/efi_device_path.c |   8 +
 lib/efi_loader/efi_root_node.c   |  13 +-
 7 files changed, 381 insertions(+), 215 deletions(-)

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2.20.1