u-boot.git/lib/charset.c, branch master

efi_loader: add an EFI variable with the file contents

2024-04-20T06:22:24+00:00

Previous patches enabled SetVariableRT using a RAM backend.
Although EBBR [0] defines a variable format we can teach userspace tools
and write the altered variables, it's better if we skip the ABI
requirements completely.

So let's add a new variable, in its own namespace called "VarToFile"
which contains a binary dump of the updated RT, BS and, NV variables
and will be updated when GetVariable is called.

Some adjustments are needed to do that.
Currently we discard BS-only variables in EBS(). We need to preserve
those on the RAM backend that exposes the variables. Since BS-only
variables can't appear at runtime we need to move the memory masking
checks from efi_var_collect() to efi_get_next_variable_name_mem()/
efi_get_variable_mem() and do the filtering at runtime.

We also need an efi_var_collect() variant available at runtime, in order
to construct the "VarToFile" buffer on the fly.

All users and applications (for linux) have to do when updating a variable
is dd that variable in the file described by "RTStorageVolatile".

Linux efivarfs uses a first 4 bytes of the output to represent attributes
in little-endian format. So, storing variables works like this:

$~ efibootmgr -n 0001
$~ dd if=/sys/firmware/efi/efivars/VarToFile-b2ac5fc9-92b7-4acd-aeac-11e818c3130c of=/boot/efi/ubootefi.var skip=4 bs=1

[0] https://arm-software.github.io/ebbr/index.html#document-chapter5-variable-storage

Suggested-by: Ard Biesheuvel  # dumping all variables to a variable
Co-developed-by: Heinrich Schuchardt  # contributed on efi_var_collect_mem()
Signed-off-by: Heinrich Schuchardt 
Signed-off-by: Ilias Apalodimas

lib/charset: Map Unicode code points to CP437 code points 1-31

2024-03-21T05:56:13+00:00

Code page 437 uses code points 1-31 for glyphs instead of control
characters. Map the appropriate Unicode code points to this code points.
Fixes rendering of grub2's menu as EFI application using the
EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL on a console with bitmap fonts.

Signed-off-by: Janne Grunau

lib: add comment in utf8_to_utf32_stream()

2024-01-24T21:17:14+00:00

The logic of utf8_to_utf32_stream() is not easy to understand.
Add a comment.

Signed-off-by: Heinrich Schuchardt

lib: Remove inclusion from these files

2023-12-21T13:54:37+00:00

After some header file cleanups to add missing include files, remove
common.h from all files in the lib directory. This primarily means just
dropping the line but in a few cases we need to add in other header
files now.

Reviewed-by: Simon Glass 
Signed-off-by: Tom Rini

lib/charset: fix u16_strlcat() return value

2023-08-08T21:05:43+00:00

strlcat returns min(strlen(dest), count)+strlen(src). Make u16_strlcat's
behaviour the same for consistency.

Fixes: eca08ce94ceb ("lib/charset: add u16_strlcat() function")
Signed-off-by: Matthias Schiffer

lib: add function u16_strcasecmp()

2023-01-04T12:17:42+00:00

Provide a function for comparing UTF-16 strings in a case insensitive
manner.

Signed-off-by: Heinrich Schuchardt

lib/charset: add u16_strlcat() function

2022-05-03T19:39:22+00:00

Provide u16 string version of strlcat().

Signed-off-by: Masahisa Kojima 
Reviewed-by: Heinrich Schuchardt

lib: simplify u16_strdup()

2022-04-15T09:26:20+00:00

Use u16_strsize() instead of duplicating it.

Signed-off-by: Heinrich Schuchardt

lib: convert u16_strlen() into a macro

2022-04-15T09:26:20+00:00

The function u16_strlen() can be implemented as call to u16_strnlen().

Signed-off-by: Heinrich Schuchardt

lib/charset: UTF-8 stream conversion

2021-03-07T16:37:13+00:00

Provide functions to convert an UTF-8 stream to code page 437 or UTF-32.

Add unit tests.

Signed-off-by: Heinrich Schuchardt