efi: make efi and bootmgr more usable

This patch set is a collection of patches to enhance efi user interfaces /commands. It will help improve user experience on efi boot and make it more usable *without* edk2's shell utility.

Let's see how it works:
=> efishell boot add 1 SHELL mmc 0:1 /Shell.efi "" => efishell boot add 2 HELLO mmc 0:1 /hello.efi "" => efishell boot dump
Boot0001:

	attributes: A-- (0x00000001)
	label: SHELL
	file_path: /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/SD(0)/SD(0)/HD(1,MBR,0x086246ba,0x800,0x40000)/\\Shell.efi
	data: 
Boot0002:
	attributes: A-- (0x00000001)
	label: HELLO
	file_path: /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/SD(0)/SD(0)/HD(1,MBR,0x086246ba,0x800,0x40000)/\\hello.efi
	data: 

=> efishell boot order 1 2
=> efishell boot order
1: Boot0001: SHELL
2: Boot0002: HELLO

=> run -e Boot0002 (or bootefi bootmgr - 2) ; '-' means no dtb specified
WARNING: booting without device tree
Booting: HELLO
## Starting EFI application at 000000007db8b040 ... Hello, world!
## Application terminated, r = 0

=> env set -e PlatformLang en ; important!
(or you can do "efishell setvar PlatformLang en")
=> env print -e
Boot0001: {boot,run}(blob)

00000000:  01 00 00 00 68 00 53 00  ....h.S.
00000010:  48 00 45 00 4c 00 4c 00  H.E.L.L.
00000020:  00 00 01 04 14 00 b9 73  .......s
00000030:  1d e6 84 a3 cc 4a ae ab  .....J..
00000040:  82 e8 28 f3 62 8b 03 1a  ..(.b...
00000050:  05 00 00 03 1a 05 00 00  ........
00000060:  04 01 2a 00 01 00 00 00  ..*.....
00000070:  00 08 00 00 00 00 00 00  ........
00000080:  00 00 04 00 00 00 00 00  ........
00000090:  ba 46 62 08 00 00 00 00  .Fb.....
000000a0:  00 00 00 00 00 00 00 00  ........
000000b0:  01 01 04 04 1c 00 5c 00  ......\.
000000c0:  5c 00 53 00 68 00 65 00  \.S.h.e.
000000d0:  6c 00 6c 00 2e 00 65 00  l.l...e.
000000e0:  66 00 69 00 00 00 7f ff  f.i....
000000f0:  04 00 00                 ...
Boot0002: {boot,run}(blob)
00000000:  01 00 00 00 68 00 48 00  ....h.H.
00000010:  45 00 4c 00 4c 00 4f 00  E.L.L.O.
00000020:  00 00 01 04 14 00 b9 73  .......s
00000030:  1d e6 84 a3 cc 4a ae ab  .....J..
00000040:  82 e8 28 f3 62 8b 03 1a  ..(.b...
00000050:  05 00 00 03 1a 05 00 00  ........
00000060:  04 01 2a 00 01 00 00 00  ..*.....
00000070:  00 08 00 00 00 00 00 00  ........
00000080:  00 00 04 00 00 00 00 00  ........
00000090:  ba 46 62 08 00 00 00 00  .Fb.....
000000a0:  00 00 00 00 00 00 00 00  ........
000000b0:  01 01 04 04 1c 00 5c 00  ......\.
000000c0:  5c 00 68 00 65 00 6c 00  \.h.e.l.
000000d0:  6c 00 6f 00 2e 00 65 00  l.o...e.
000000e0:  66 00 69 00 00 00 7f ff  f.i....
000000f0:  04 00 00                 ...

BootOrder: {boot,run}(blob)
00000000: 01 00 02 00 ....
OsIndicationsSupported: {ro,boot}(blob) 00000000: 00 00 00 00 00 00 00 00 ........
PlatformLang: {boot,run}(blob)
00000000: 65 6e en

=> run -e Boot0001 or bootefi bootmgr

(shell ...)

"setvar" command now supports efi shell-like syntax:

=> env set -e foo =S\"akashi\" =0x012345 =Habcdef => env print -e foo
foo: {boot,run}(blob)

00000000:  61 6b 61 73 68 69 45 23  akashiE#
00000010:  01 00 ab cd ef           .....

Other useful sub commands are:
=> efishell devices ; print uefi devices
=> efishell drivers ; print uefi drivers
=> efishell images ; print loaded images
=> efishell dh ; print uefi handles
=> efishell memmap ; dump uefi memory map

# I admit there is some room to improve the output from those commands.

Enjoy!
-Takahiro Akashi

Changes in v2 (Nov 5, 2018)
* modify efi_dp_from_name() for use in efishell
* rename efi_marshal_load_option() to efi_serialize_load_option(), taking a "struct efi_load_option" as an argument
* improve a format in dumping uefi variables
* enhance a setvar syntax as efi's shell does
* change a syntax from "bootefi bootmgr -2" to "bootefi bootmgr - 2"
* add -e option to run command
* add -e option to env command
* add more sub-commands

AKASHI Takahiro (14):
efi_loader: allow device == NULL in efi_dp_from_name()
efi_loader: bootmgr: add load option helper functions
efi_loader: bootmgr: allow for running a given load option
cmd: add efishell command
cmd: efishell: add devices command
cmd: efishell: add drivers command
cmd: efishell: add images command
cmd: efishell: add memmap command
cmd: efishell: add dh command
cmd: bootefi: carve out fdt parameter handling
cmd: bootefi: run an EFI application of a specific load option
cmd: run: add "-e" option to run an EFI application
cmd: efishell: export uefi variable helper functions
cmd: env: add "-e" option for handling UEFI variables

 cmd/Makefile                     |   2 +-
 cmd/bootefi.c                    |  71 ++-
 cmd/efishell.c                   | 970 +++++++++++++++++++++++++++++++
 cmd/efishell.h                   |   6 +
 cmd/nvedit.c                     |  63 +-
 common/cli.c                     |  30 +
 include/command.h                |   5 +
 include/efi_loader.h             |  26 +-
 lib/efi_loader/efi_bootmgr.c     | 101 ++--
 lib/efi_loader/efi_device_path.c |  11 +-
 10 files changed, 1223 insertions(+), 62 deletions(-)
 create mode 100644 cmd/efishell.c
 create mode 100644 cmd/efishell.h

2.19.0