[PATCH v1 00/54] efi: implement EFI loader support in barebox
Ahmad Fatoum
a.fatoum at pengutronix.de
Thu Dec 18 02:37:20 PST 2025
This adds enough support to barebox, so we can boot GRUB and an EFI
stubbed kernel in Debian ARM32 and ARM64 UEFI CDROM installers and
ARM64 nocloud images.
This was mostly tested on Qemu Virt and a RK3568-powered QNAP TS-433eU
and with Debian 13 (Trixie) images.
This builds on lots of great work done on U-Boot. Some of the protocols
differ only little from the U-Boot original, but the parts that are
interfacing with barebox frameworks like memory allocations, file
handling, block devices and so on are understandably different.
I am still debugging an integration test that will boot a Debian kernel
and verify somethings, so that will follow later.
For manual use, here's an example:
IMG=https://cloud.debian.org/images/cloud/trixie/latest/debian-13-nocloud-arm64.raw
qemu-system-aarch64 -kernel images/barebox-dt-2nd.img \
-drive if=virtio,format=raw,snapshot=on,file=$IMG -device virtio-rng -nographic \
-machine virt,highmem=off -cpu cortex-a57 -m 1024M -serial mon:stdio -trace file=/dev/null
My wishlist for the midterm future:
- Support for StandaloneMM. Currently only storing the variables in a
file in the ESP is supported, which is not power-fail safe, doesn't
allow authenticated variables and doesn't work for setups with
multiple ESPs (e.g. when installing from USB flash drive).
- Support for capsules: This would provide us a long missing way
to expose barebox_update handlers to userspace
- Making this a sensible default: EFI boot happens with MMU enabled
and I can see myself using this even with just an EFI-stubbed kernel
to speed up early kernel boot, but this needs more thorough testing,
before we enable it in existing defconfigs
- Implement efibootmgr, so we can boot according to Boot####
variables. Currently, GRUB or the kernel must either be invoked
directly or be placed at the removable media path
(CONFIG_EFI_PAYLOAD_PATH).
- Turn run time services into a DSO instead of just a section within
barebox
Ahmad Fatoum (54):
efi: payload: initrd: fix type mismatch on 32-bit
efi: loader: switch over event/memory key type to efi_uintn_t
lib: vsprintf: print human-readable EFI GUIDs with %pUs
fs: fat: don't duplicate dentries when resolving differently cased
paths
efi: loader: add memory accounting
efi: loader: add pool allocator
efi: types: add EFI_RUNTIME_SECTION
resource: assign memory banks a default type and attr
ARM: lds: add EFI runtime service section
ARM: move needed assembly routines into EFI runtime section
crypto: crc32: implement position independent CRC32
efi: loader: add support for tracing calls back into UEFI
efi: loader: add table utility functions
lib: add charset helpers
efi: loader: add object handling API
efi: loader: add devicepath support
efi: loader: add debug support
efi: loader: add boot services support
efi: loader: add support for runtime services before ExitBootServices
efi: loader: setup root node
efi: loader: add watchdog support
efi: loader: move PE implementation out of common code
efi: loader: protocol: add file protocol support
efi: loader: protocol: add Block IO support
efi: loader: protocol: implement efi_file_from_path
efi: loader: boot: implement LoadImage BootService
efi: loader: add EFI load option handling
efi: loader: protocol: add graphical output protocol support
efi: loader: protocol: add console support
efi: loader: protocol: add HII support
efi: loader: protocol: add unicode collation support
efi: loader: protocol: add random number generator protocol
efi: loader: protocol: add device_path_utilities
efi: loader: support formatting only first device path node to text
efi: loader: protocol: add efi_device_path_to_text support
restart: allow drivers to register runtime restart handler
poweroff: allow drivers to register runtime poweroff handler
ARM: psci: client: register runtime service poweroff handler
ARM: psci: client: register runtime service restart handler
hardening: disable some features when EFI runtime support is enabled
filetype: add new filetype for efi-stubbed ARM zImages
bootm: add global.bootm.efi toggle
efi: loader: add ESP boot entry provider
efi: loader: add rudimentary EFI boot manager
efi: loader: implement bootm handler
efi: runtime: add EFI variable support
efi: loader: populate OsIndicationsSupported/PlatformLang variables
ARM: don't disable MMU when EFI booting
efi: runtime: add runtime service support after ExitBootServices
efi: runtime: add relocation check
efi: loader: CONFIG_EFI_RT_VOLATILE_STORE
efi: loader: support ExitBootServices
efi: loader: pass along SMBIOS table
ARM: configs: add multi_v7/8_efiloader_defconfig
Makefile | 3 +
arch/Kconfig | 3 +
arch/arm/Kconfig | 3 +
arch/arm/Makefile | 4 +
arch/arm/cpu/cpu.c | 3 +
arch/arm/cpu/psci-client.c | 27 +-
arch/arm/cpu/smccc-call_32.S | 4 +-
arch/arm/cpu/smccc-call_64.S | 5 +-
arch/arm/lib32/barebox.lds.S | 5 +
arch/arm/lib32/memcpy.S | 3 +-
arch/arm/lib32/memmove.S | 3 +-
arch/arm/lib32/memset.S | 3 +-
arch/arm/lib64/armlinux.c | 14 +-
arch/arm/lib64/barebox.lds.S | 4 +
arch/arm/lib64/memcpy.S | 3 +
arch/arm/lib64/memset.S | 3 +
arch/riscv/lib/bootm.c | 14 +-
commands/efi_handle_dump.c | 4 +-
common/Kconfig | 16 +-
common/Kconfig.debug | 23 +
common/Makefile | 1 -
common/boards/configs/efi-loader.config | 2 +
common/boot.c | 7 +-
common/bootm.c | 43 +
common/filetype.c | 20 +-
common/memory.c | 40 +-
common/pe.c | 382 --
common/poweroff.c | 36 +
common/restart.c | 46 +
crypto/crc32.c | 24 +
drivers/efi/efi-device.c | 4 +-
efi/Kconfig | 31 +
efi/Makefile | 2 +
efi/devicepath.c | 17 +-
efi/guid.c | 4 +-
efi/initrd.c | 4 +-
efi/loader/Kconfig | 91 +
efi/loader/Makefile | 23 +
efi/loader/boot.c | 3920 ++++++++++++++++++
efi/loader/bootesp.c | 260 ++
efi/loader/bootm.c | 358 ++
efi/loader/debug_support.c | 192 +
efi/loader/defaultvars.c | 122 +
efi/loader/devicepath.c | 1073 +++++
efi/loader/efi_var_common.c | 475 +++
efi/loader/efi_var_file.c | 254 ++
efi/loader/efi_var_mem.c | 80 +
efi/loader/efi_variable.c | 214 +
efi/loader/efibootmgr.c | 79 +
efi/loader/loadopts.c | 181 +
efi/loader/memory.c | 415 ++
efi/loader/pe.c | 727 ++++
efi/loader/pool_alloc.c | 205 +
efi/loader/protocols/Kconfig | 56 +
efi/loader/protocols/Makefile | 11 +
efi/loader/protocols/console.c | 1327 ++++++
efi/loader/protocols/device_path_to_text.c | 130 +
efi/loader/protocols/device_path_utilities.c | 210 +
efi/loader/protocols/disk.c | 412 ++
efi/loader/protocols/file.c | 1044 +++++
efi/loader/protocols/gop.c | 572 +++
efi/loader/protocols/hii.c | 1100 +++++
efi/loader/protocols/hii_config.c | 157 +
efi/loader/protocols/rng.c | 165 +
efi/loader/protocols/unicode_collation.c | 329 ++
efi/loader/runtime.c | 314 ++
efi/loader/setup.c | 233 ++
efi/loader/smbios.c | 55 +
efi/loader/table.c | 31 +
efi/loader/trace.c | 44 +
efi/loader/variable.h | 35 +
efi/loader/watchdog.c | 94 +
efi/payload/bootm.c | 1 +
efi/payload/init.c | 2 +-
efi/runtime/Kconfig | 44 +
efi/runtime/Makefile | 53 +
efi/runtime/common.h | 35 +
efi/runtime/efi_var_mem.c | 380 ++
efi/runtime/efi_variable.c | 211 +
efi/runtime/services.c | 303 ++
fs/fat/fat.c | 1 +
fs/fs.c | 10 +
include/asm-generic/barebox.lds.h | 40 +
include/asm-generic/sections.h | 10 +
include/bootm.h | 12 +
include/capitalization.h | 2029 +++++++++
include/charset.h | 346 ++
include/crc.h | 2 +
include/efi/attributes.h | 84 +
include/efi/devicepath.h | 5 +-
include/efi/guid.h | 2 +-
include/efi/loader.h | 86 +
include/efi/loader/debug.h | 73 +
include/efi/loader/devicepath.h | 66 +
include/efi/loader/event.h | 93 +
include/efi/loader/file.h | 33 +
include/efi/loader/image.h | 18 +
include/efi/loader/object.h | 137 +
include/efi/loader/option.h | 36 +
include/efi/loader/pe.h | 83 +
include/efi/loader/table.h | 11 +
include/efi/loader/trace.h | 111 +
include/efi/loader/variable.h | 153 +
include/efi/mode.h | 23 +-
include/efi/protocol/devicepath.h | 42 +
include/efi/protocol/gop.h | 9 +
include/efi/protocol/hii.h | 428 ++
include/efi/protocol/text.h | 32 +-
include/efi/protocol/unicode_collation.h | 24 +
include/efi/runtime.h | 164 +
include/efi/services.h | 28 +-
include/efi/table/rt_properties.h | 30 +
include/efi/types.h | 14 +
include/efi/variable.h | 7 +-
include/filetype.h | 2 +
include/libfile.h | 2 +
include/linux/fs.h | 1 +
include/linux/ioport.h | 2 +
include/memory.h | 2 +
include/pe.h | 47 +-
include/poweroff.h | 2 +
include/restart.h | 3 +
lib/Kconfig | 16 +
lib/Kconfig.hardening | 2 +
lib/Makefile | 2 +
lib/charset.c | 583 +++
lib/cp437.h | 48 +
lib/libfile.c | 56 +
lib/vsprintf.c | 25 +-
scripts/check-efi-runtime.sh | 13 +
test/self/printf.c | 4 +
131 files changed, 21392 insertions(+), 487 deletions(-)
create mode 100644 common/boards/configs/efi-loader.config
delete mode 100644 common/pe.c
create mode 100644 efi/loader/Kconfig
create mode 100644 efi/loader/Makefile
create mode 100644 efi/loader/boot.c
create mode 100644 efi/loader/bootesp.c
create mode 100644 efi/loader/bootm.c
create mode 100644 efi/loader/debug_support.c
create mode 100644 efi/loader/defaultvars.c
create mode 100644 efi/loader/devicepath.c
create mode 100644 efi/loader/efi_var_common.c
create mode 100644 efi/loader/efi_var_file.c
create mode 100644 efi/loader/efi_var_mem.c
create mode 100644 efi/loader/efi_variable.c
create mode 100644 efi/loader/efibootmgr.c
create mode 100644 efi/loader/loadopts.c
create mode 100644 efi/loader/memory.c
create mode 100644 efi/loader/pe.c
create mode 100644 efi/loader/pool_alloc.c
create mode 100644 efi/loader/protocols/Kconfig
create mode 100644 efi/loader/protocols/Makefile
create mode 100644 efi/loader/protocols/console.c
create mode 100644 efi/loader/protocols/device_path_to_text.c
create mode 100644 efi/loader/protocols/device_path_utilities.c
create mode 100644 efi/loader/protocols/disk.c
create mode 100644 efi/loader/protocols/file.c
create mode 100644 efi/loader/protocols/gop.c
create mode 100644 efi/loader/protocols/hii.c
create mode 100644 efi/loader/protocols/hii_config.c
create mode 100644 efi/loader/protocols/rng.c
create mode 100644 efi/loader/protocols/unicode_collation.c
create mode 100644 efi/loader/runtime.c
create mode 100644 efi/loader/setup.c
create mode 100644 efi/loader/smbios.c
create mode 100644 efi/loader/table.c
create mode 100644 efi/loader/trace.c
create mode 100644 efi/loader/variable.h
create mode 100644 efi/loader/watchdog.c
create mode 100644 efi/runtime/Kconfig
create mode 100644 efi/runtime/Makefile
create mode 100644 efi/runtime/common.h
create mode 100644 efi/runtime/efi_var_mem.c
create mode 100644 efi/runtime/efi_variable.c
create mode 100644 efi/runtime/services.c
create mode 100644 include/capitalization.h
create mode 100644 include/charset.h
create mode 100644 include/efi/loader.h
create mode 100644 include/efi/loader/debug.h
create mode 100644 include/efi/loader/devicepath.h
create mode 100644 include/efi/loader/event.h
create mode 100644 include/efi/loader/file.h
create mode 100644 include/efi/loader/image.h
create mode 100644 include/efi/loader/object.h
create mode 100644 include/efi/loader/option.h
create mode 100644 include/efi/loader/pe.h
create mode 100644 include/efi/loader/table.h
create mode 100644 include/efi/loader/trace.h
create mode 100644 include/efi/loader/variable.h
create mode 100644 include/efi/protocol/devicepath.h
create mode 100644 include/efi/protocol/hii.h
create mode 100644 include/efi/protocol/unicode_collation.h
create mode 100644 include/efi/runtime.h
create mode 100644 include/efi/table/rt_properties.h
create mode 100644 lib/charset.c
create mode 100644 lib/cp437.h
create mode 100755 scripts/check-efi-runtime.sh
--
2.47.3
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