[PATCH 00/16] efi_loader: non-volatile and runtime variables

Heinrich Schuchardt
2020-03-27T05:27:44Z

Up to UEFI variable where stored in U-Boot environment variables. Saving
UEFI variables was not possible without saving the U-Boot environment
variables.

With this patch series file ubootefi.var in the EFI system partition is
used for saving UEFI variables.

Furthermore the UEFI variables are exposed at runtime and are writable at
runtime.

The missing piece is transferring the variable changed at runtime back to
the firmware. I will evaluate the following options:

* using a fixed memory address: we could read the memory area after a
reboot
* using a systemd service which is called before the system goes down

Many of the CCs are due to the changes in disk/part_efi.c. Here the logic
to detect the EFI system partition is introduced (patch 04/16).

Heinrich Schuchardt (16):
cmd: efidebug: fix int to pointer cast
efi_loader: only reserve memory if fdt node enabled
efi_loader: eliminate EFI_CALL() for variable access
part: detect EFI system partition
efi_loader: identify EFI system partition
efi_loader: keep attributes in efi_set_variable_int()
efi_loader: export initialization state
efi_loader: change setup sequence
efi_loader: imply FAT, FAT_WRITE
efi_loader: UEFI variable persistence
efi_loader: export efi_convert_pointer()
efi_loader: optional pointer for ConvertPointer
efi_loader: memory buffer for variables
efi_loader: use memory based variable storage
efi_loader: enable UEFI variables at runtime
efi_selftest: adjust runtime test for variables

cmd/bootefi.c | 3 +-
cmd/efidebug.c | 71 +-
cmd/nvedit_efi.c | 18 +-
disk/part_dos.c | 10 +-
disk/part_efi.c | 12 +-
include/efi_api.h | 2 +
include/efi_loader.h | 22 +
include/efi_variable.h | 52 ++
include/part.h | 11 +-
lib/efi_loader/Kconfig | 10 +
lib/efi_loader/Makefile | 2 +
lib/efi_loader/efi_bootmgr.c | 20 +-
lib/efi_loader/efi_disk.c | 20 +
lib/efi_loader/efi_runtime.c | 20 +-
lib/efi_loader/efi_setup.c | 54 +-
lib/efi_loader/efi_variable.c | 635 ++++++------------
lib/efi_loader/efi_variables_file.c | 235 +++++++
lib/efi_loader/efi_variables_mem.c | 324 +++++++++
.../efi_selftest_variables_runtime.c | 47 +-
19 files changed, 1037 insertions(+), 531 deletions(-)
create mode 100644 include/efi_variable.h
create mode 100644 lib/efi_loader/efi_variables_file.c
create mode 100644 lib/efi_loader/efi_variables_mem.c

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2.25.1