u-boot.git/include/efi_loader.h, branch master

efi_loader: avoid superfluous variable store writes on unchanged data

2026-03-14T07:14:20+00:00

Every SetVariable() call triggers efi_var_mem_ins() followed by
efi_var_to_storage(), even when the variable value is not actually
changing. This is unfriendly to flash-backed stores that suffer
wear from unnecessary erase/write cycles.

Add a change-detection path to efi_var_mem_ins(): when size2 == 0
(i.e. not an append) and the caller passes a non-NULL changep flag,
look up the existing variable and compare attributes, length, time
and data byte-by-byte. If everything matches, set *changep = false
and return EFI_SUCCESS without touching the variable buffer.

Both efi_set_variable_int() and efi_set_variable_runtime() now
check the flag and skip efi_var_mem_del() / efi_var_to_storage()
when nothing changed.

Introduce efi_memcmp_runtime() - a runtime-safe byte-by-byte memory
comparison helper, following the same pattern as the existing
efi_memcpy_runtime(). The standard memcmp() is not available after
ExitBootServices() and calling it from Linux will crash.

Tested-by: Heinrich Schuchardt 
Reviewed-by: Heinrich Schuchardt 
Signed-off-by: Michal Simek 
Reviewed-by: Ilias Apalodimas

efi_loader: export efi_ecpt_guid

2026-03-14T07:10:26+00:00

Export the ECPT GUID, to prepare accessing it from more than one location.

The C file containing the GUID is compiled only when CONFIG_EFI_ECPT is
set; gate the export accordingly.

Signed-off-by: Vincent Stehlé 
Cc: Heinrich Schuchardt 
Cc: Ilias Apalodimas 
Cc: Tom Rini 
Reviewed-by: Ilias Apalodimas 
Reviewed-by: Heinrich Schuchardt

efi: add EFI_DEBUG_IMAGE_INFO for debug

2025-07-03T09:25:56+00:00

This commit adds the functionality of generate EFI_DEBUG_IMAGE_INFO
while loading the image.

This feature is described in UEFI Spec 2.10. Section 18.4.3.
The implementation ensures support for hardware-assisted debugging and
provides a standardized mechanism for debuggers to discover the load
address of an EFI application.

Cc: Ilias Apalodimas 
Cc: Peter Robinson 
Cc: Simon Glass 
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Tested-by: Heinrich Schuchardt 
Acked-by: Ilias Apalodimas 
Signed-off-by: Ilias Apalodimas

lib: efi_loader: efi_memory.c: add efi_realloc() for realloc memory

2025-07-03T09:25:56+00:00

Add efi_realloc() for realloc memory that previously alloc by efi_alloc().
Note that if realloced memory is explicitly allocated as BootServicesData.

Cc: Heinrich Schuchardt 
Cc: Ilias Apalodimas 
Cc: Peter Robinson 
Cc: Simon Glass 
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Reviewed-by: Ilias Apalodimas 
Signed-off-by: Ilias Apalodimas

efi: add EFI_DEBUG_IMAGE_INFO_TABLE for debug

2025-07-03T09:25:56+00:00

EFI_DEBUG_IMAGE_INFO_TABLE is used to store EFI_LOADED_IMAGE for
debug purpose. This commit adds the table to the EFI_CONFIGURATION_TABLE.

This feature is described in UEFI Spec version 2.10. Section 18.4.
The implementation ensures support for hardware-assisted debugging and
provides a standardized mechanism for debuggers to discover and interact
with system-level debug resources.

Cc: Heinrich Schuchardt 
Cc: Peter Robinson 
Cc: Simon Glass 
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Reviewed-by: Ilias Apalodimas 
Signed-off-by: Ilias Apalodimas

efi: add EFI_SYSTEM_TABLE_POINTER for debug

2025-07-03T09:25:47+00:00

Add EFI_SYSTEM_TABLE_POINTER structure for remote debugger to locate
the address of EFI_SYSTEM_TABLE.

This feature is described in UEFI SPEC version 2.10. Section 18.4.2.
The implementation ensures support for hardware-assisted debugging and
provides a standardized mechanism for debuggers to discover the EFI
system table.

Cc: Peter Robinson 
Cc: Simon Glass 
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Reviewed-by: Ilias Apalodimas 
Tested-by: Heinrich Schuchardt 
Reviewed-by: Heinrich Schuchardt  # change memset(systab_pointer, 0 ...) -> systab_pointer->crc32 = 0;
Signed-off-by: Ilias Apalodimas

Merge patch series "Audit include list for include/[a-m]*.h"

2025-06-02T23:43:56+00:00

Tom Rini  says:

Hey all,

Related to my other series I've posted recently on cleaning up some
headers, this series here is the result of at least lightly auditing the
#includes used in include/[a-m]*.h. This ignores subdirectories, as at
least in part I think the top-level includes we've constructed are the
most likely places to have some extra transitive include paths. I'm sure
there's exceptions and I'll likely audit deeper once this first pass is
done. This only gets as far as "include/m*.h" because I didn't want this
to get too big. This also sets aside  and . While
miiphy.h does not directly need  there are *so* many users and I
think I had half of the tree just about not building when I first tried.
It might be worth further investigation, but it might just be OK as-is.

Link: https://lore.kernel.org/r/20250521230119.2084088-1-trini@konsulko.com

include/efi_loader.h, include/efi_tcg2.h: Audit include list

2025-06-02T23:26:15+00:00

In include/efi_loader.h we do not directly need , ,
 nor  so remove them. In include/efi_tcg2.h
we make use of  but did not include it, so add it directly.

Reviewed-by: Ilias Apalodimas 
Tested-by: Ilias Apalodimas 
Signed-off-by: Tom Rini

efi_loader: Separate device path into its own header

2025-05-25T09:27:18+00:00

These functions are useful for the EFI app. As a first step towards
making these available outside lib/efi_loader, create a separate header
file and include it where needed. Add proper comments to the functions,
since many are missing at present.

Signed-off-by: Simon Glass 
Reviewed-by: Heinrich Schuchardt

efi_loader: Disable ANSI output for tests

2025-05-18T06:47:58+00:00

We don't want ANSI escape-sequences written in tests since it is a pain
to check the output with ut_assert_nextline() et al.

Provide a way to tests to request that these characters not be sent.

Add a proper function comment while we are here, to encourage others.

Signed-off-by: Simon Glass 
Reviewed-by: Heinrich Schuchardt