u-boot.git/include/efi_variable.h, branch v2021.01

efi_loader: make variable store size customizable

2020-12-20T16:40:06+00:00

Currently the size of the buffer to keep UEFI variables in memory is fixed
at 16384 bytes. This size has proven to be too small for some use cases.

Make the size of the memory buffer for UEFI variables customizable.

Reported-by: Paulo Alcantara (SUSE) 
Signed-off-by: Heinrich Schuchardt 
Acked-by: Ilias Apalodimas

efi_loader: remove empty comment line

2020-08-24T14:37:53+00:00

Remove a line leading to a warning in make htmldocs.

Signed-off-by: Heinrich Schuchardt

efi_loader: Enable run-time variable support for tee based variables

2020-08-01T09:57:41+00:00

We recently added functions for storing/restoring variables
from a file to a memory backed buffer marked as __efi_runtime_data
commit f1f990a8c958 ("efi_loader: memory buffer for variables")
commit 5f7dcf079de8 ("efi_loader: UEFI variable persistence")

Using the same idea we now can support GetVariable() and GetNextVariable()
on the OP-TEE based variables as well.

So let's re-arrange the code a bit and move the commmon code for
accessing variables out of efi_variable.c. Create common functions for
reading variables from memory that both implementations can use on
run-time. Then just use those functions in the run-time variants of the
OP-TEE based EFI variable implementation and initialize the memory
buffer on ExitBootServices()

Signed-off-by: Ilias Apalodimas 
Reviewed-by: Heinrich Schuchardt

efi_loader: describe EFI_VAR_FILE_MAGIC

2020-07-16T10:37:03+00:00

Add documentation for EFI_VAR_FILE_MAGIC used in the file format for UEFI
variables.

Signed-off-by: Heinrich Schuchardt

efi_loader: pre-seed UEFI variables

2020-07-16T10:37:02+00:00

Include a file with the initial values for non-volatile UEFI variables
into the U-Boot binary. If this variable is set, changes to variable PK
will not be allowed.

Signed-off-by: Heinrich Schuchardt

efi_loader: identify PK, KEK, db, dbx correctly

2020-07-16T10:37:02+00:00

To determine if a varible is on the of the authentication variables
PK, KEK, db, dbx we have to check both the name and the GUID.

Provide a function converting the variable-name/guid pair to an enum and
use it consistently.

Signed-off-by: Heinrich Schuchardt

efi_loader: restructure code for TEE variables

2020-07-16T10:37:02+00:00

When using secure boot functions needed both for file and TEE based UEFI
variables have to be moved to the common code module efi_var_common.c.

Signed-off-by: Heinrich Schuchardt

efi_loader: memory buffer for variables

2020-07-11T21:14:17+00:00

Saving UEFI variable as encoded U-Boot environment variables does not allow
support at runtime.

Provide functions to manage a memory buffer with UEFI variables.

Signed-off-by: Heinrich Schuchardt

efi_loader: UEFI variable persistence

2020-07-11T21:14:17+00:00

Persist non-volatile UEFI variables in a file on the EFI system partition.

The file is written whenever a non-volatile UEFI variable is changed after
initialization of the UEFI sub-system.

The file is read during the UEFI sub-system initialization to restore
non-volatile UEFI variables.

Signed-off-by: Heinrich Schuchardt

efi_loader: separate UEFI variable API from implemementation

2020-07-11T21:14:16+00:00

Separate the remaining UEFI variable API functions GetNextVariableName and
QueryVariableInfo() from internal functions implementing them.

Signed-off-by: Heinrich Schuchardt