AI d3ab5a5b55 Add early VGA boot diagnostics for UTM debugging ...

Write boot milestones directly to VGA text buffer (0xB8000) at each
init stage so the user can see exactly where the kernel stops on
platforms where the VGA driver may not initialize.

Milestones: Magic OK, GDT, IDT, PIC, PMM, PAGING, HEAP, CPIO, VFS,
INITRD, TSS. Each appears as white-on-blue text.

If the multiboot2 magic check fails, display the received magic value
in red-on-white on screen and halt (instead of silently returning).

This helps diagnose if GRUB matched the multiboot1 header instead.

2026-02-23 13:42:25 +00:00

4.5 KiB

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