Daan De Meyer
7b9d76cba7
UEFI firmware can report the currently-active keyboard layout via EFI_HII_DATABASE_PROTOCOL.GetKeyboardLayout(). The layout descriptor includes an RFC 4646 / BCP 47 language tag (e.g. "en-US"). Query this from sd-boot/sd-stub and write it to a new LoaderKeyboardLayout EFI variable, advertised through a new EFI_LOADER_FEATURE_KEYBOARD_LAYOUT feature bit. On the OS side, systemd-vconsole-setup reads the variable as a lowest-priority fallback for the console keymap. To map the BCP 47 tag to a vconsole keymap we extend /usr/share/systemd/kbd-model-map with an optional sixth column listing the comma-separated BCP 47 tags each row covers; a new find_vconsole_keymap_for_bcp47() helper walks the file, preferring an exact tag match and otherwise falling back to the row whose tag matches the input's primary subtag. Credentials, /etc/vconsole.conf, and vconsole.keymap= on the kernel command line continue to take precedence. bootctl status surfaces the new variable, printing the language tag or "n/a (not reported by firmware)" when sd-boot advertises the feature but the firmware HII database didn't expose a layout (common on QEMU without a USB keyboard, since EDK2's PS/2 driver does not register an HII keyboard layout).
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