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This fixes boot regression on Xbox, introduced in 3964c936cb.
A new `call writestr` on early boot leads to `writechr` helper call,
which uses INT 10h BIOS service. This ends up in early boot crash,
as the original Xbox doesn't have VGA BIOS, nor the BIOS Data Area.
Fix the problem by adding Xbox-specific assembly helpers.
CORE-16216, CORE-19882