Uefi boot #2
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Uefi boot #2
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…s memory This will help us be more dynamic, and we don't have to be strict on the rules of at least 128MB. Also having the bios memory not mapped, we can use that space for something else. For now its not being used, but maybe in the future. This will bring us one step closter to using UEFI
Just using 0x1000 arbitrarily is dangerous as it could be used by something else. And looks like its used for Multiboot2 info in EFI mode. So its better to have a specific space in memory allocated for us only.
Switching to multiboot2 gives us a lot of benefits, such as: - able to boot UEFI devices. - better way to get RSDP table directly from boot instead of finding it in memory, which doesn't work in UEFI. - More configuration control (more options/tags we can specify to the bootloader)
…ey are reserved So, looks like this won't trigger an exception (#UD) unless the `CR4.DE` bit is set, which looks like its set by default in BIOS boot, but UEFI (at least the firmware I use), makes it not set which triggered an issue.
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Fixed #1
Added:
5MBonly in BIOS and80MB~in UEFI for some reason)boot.S, we shouldn't just use address0x1000and such, so allocated a specific space in the ELF file.multiboot2, it has more features and support EFI easily.