x86/boot changes for v6.9:
- Continuing work by Ard Biesheuvel to improve the x86 early startup code,
with the long-term goal to make it position independent:
- Get rid of early accesses to global objects, either by moving them
to the stack, deferring the access until later, or dropping the
globals entirely.
- Move all code that runs early via the 1:1 mapping into .head.text,
and move code that does not out of it, so that build time checks can
be added later to ensure that no inadvertent absolute references were
emitted into code that does not tolerate them.
- Remove fixup_pointer() and occurrences of __pa_symbol(), which rely
on the compiler emitting absolute references, which is not guaranteed.
- Improve the early console code.
- Add early console message about ignored NMIs, so that users are at least
warned about their existence - even if we cannot do anything about them.
- Improve the kexec code's kernel load address handling.
- Enable more X86S (simplified x86) bits.
- Simplify early boot GDT handling
- Micro-optimize the boot code a bit
- Misc cleanups.
Signed-off-by: Ingo Molnar <mingo@kernel.org>