[U-Boot] [RFC v2 00/11] 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 unusal
  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 is a bug fix.
Patch#2 to #9 are preparatory patches for patch#10.
Patch#10 is a core part of reworking.
Patch#11 is for standalone boot manager.

# Please note that some patches, say patch#4 and #5, can be combined into one
# but I intentionally keep them separated to clearify my intentions of changes.

Prerequsite patch:
* "efi_loader: bootmgr: support BootNext and BootCurrent variable behavior"
* "efi_loader: release file buffer after loading image"

Issues:
* load_image() will take an argument of "parent_handle," but obviously
  we don't have any parent when invoking an application from command line.
  (See FIXME in patch#10.)
* Starting EDK2's Shell.efi from boot manager fails.
  (I need to find out a fix.)
* The semantics of efi_dp_from_name() should be changed.
  (See FIXME in patch#10.)

-Takahiro Akashi

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 (11):
  efi_loader: boottime: add loaded image device path protocol to image
    handle
  efi_loader: boottime: export efi_[un]load_image()
  efi_loader: device_path: handle special case of loading
  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                     | 521 +++++++++++++++++++-----------
 include/efi_api.h                 |   4 +
 include/efi_loader.h              |  15 +-
 lib/efi_loader/efi_bootmgr.c      |  43 +--
 lib/efi_loader/efi_boottime.c     |  34 +-
 lib/efi_loader/efi_device_path.c  |   8 +
 lib/efi_loader/efi_image_loader.c |   2 +
 8 files changed, 411 insertions(+), 224 deletions(-)

-- 
2.20.1