Popcorn

This is a small bootloader written in x86 NASM and an equally small kernel written in C.

Producing a binary

Nix

nix build

Generic Linux

1. yasm bootloader/main.asm -f elf64 -o boot.o

NASM should also work.

gcc -m64 kernel/*.c boot.o -o boot.img -nostdlib -fno-pie \
-ffreestanding -std=c11 -mno-red-zone -fno-exceptions \
-nostdlib -Wextra -Werror -T linker.ld

Running in QEMU

Nix

nix run --impure

The --impure flag is necessary because the flake will use the users nixpkgs channel for the qemu package to ensure glibc compatibility.

Generic Linux

First produce the binary and then run this command.

qemu-system-x86_64 -snapshot -hda boot.img