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x86-bare-metal-examples/multiboot.md
Ciro Santilli c1211ace36 Split from assembly-cheat.
2015-09-06 16:22:10 +02:00

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Multiboot

https://en.wikipedia.org/wiki/Multiboot_Specification

Standard created by GRUB for booting OSes.

Multiboot files are an extension of ELF files with a special header.

Advantages: GRUB does housekeeping magic for you:

  • you can store the OS as a regular file inside a filesystem
  • your program starts in 32-bit mode already, not 16 bit real mde

Disadvantages:

  • more boilerplate

GRUB leaves the application into a well defined starting state.

Implemented by Linux and many NIXes, but not Windows or Mac.

Use grub-mkrescue to make a multiboot file into a bootable disk.