systemctl and logind were unconditionally using functions that were not compiled
on non-EFI systems. Add stubs returning -EOPNOTSUPP to fix compile again.
There was a bug where is_efi_*() could return a negative error value, which would be treated as 'true',
just make this a bool in the helper library to avoid the problem.
This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
Prefer firmware-provided performance data over loader-exported ones; if
ACPI data is available, always use it, otherwise try to read the loader
data.
The firmware-provided variables start at the time the first EFI image
is executed and end when the operating system exits the boot services;
the (loader) time calculated in systemd-analyze increases.
This allows us to print simple performance data of all parts of the boot now:
- firmware
- boot loader
- kernel
- initrd
- userspace
This only works for bootloaders which support passing TSC data via EFI
variables. As of now that's only gummiboot.
