6efdd7fec5
Currently we have a 100ms delay which allows for people to enter/show the boot menu even when timeout is set to zero. In a handful of cases, that may not be needed - both in terms of access policy, as well as latency. For example: the option to provide the boot menu may be hidden behind an "expert only" UX in the OS, to avoid end users from accidentally entering it. In addition, the current 100ms input polling may cause unexpected additional delays in the boot. Some example numbers from my SteamDeck: - boot counting/rename/flush doubles 300us -> 600us - seed/hash setup doubles 900us -> 1800us - kernel/image load gets ~40% slower 107ms -> 167ms It's not entirely clear why the UEFI calls gets slower, nevertheless the information in itself proves useful. This commit introduces a new option "menu-disabled", which omits the 100ms delay. The option is documented throughout the manual pages as well as the Boot Loader Specification. v2: - use STR_IN_SET v3: - drop erroneous whitespace v4: - add a new LoaderFeature bit, - don't change ABI keep TIMEOUT_* tokens the same - move new token in the 64bit range, update API and storage for it - change inc/dec behaviour to TIMEOUT_MIN : TIMEOUT_MENU_FORCE - user cannot opt-in from sd-boot itself, add assert_not_reached() v5: - s/Menu disablement control/Menu can be disabled/ - rewrap comments to 109 - use SYNTHETIC_ERRNO(EOPNOTSUPP) Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
System and Service Manager
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