mirror of
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31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
# cowos
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Custom OS from scratch in C
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# Notes
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This only supports 32bit for now, please DO NOT compile with 64bit or it'll fail to boot
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## compilation of any component
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You are required to get your own cross C compiler. This is because normal C compilers for your Linux distro (assuming that you are on Linux) will optimize against your own libs and other things. This OS doesn't exist yet, so this is a big no no in OS development. Another thing is that you want to compile for 32 bit, so you'll need to cross compile anyways...
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### general c files
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```bash
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i386-elf-gcc -c kernel.c -o kernel.o -std=c99 -ffreestanding -O2 -Wall -Wextra # i386 is the 32 bit version of x86
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# also please compile with the -Iinclude flag to include the libraries like string.h in the arch
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```
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### "compiling" the "boot stub"
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```bash
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i386-elf-as boot.s -o boot.o
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```
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### linking the "compiled" boot stub w/compiled kernel img
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```
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i386-elf-gcc -T linker.ld -o cowos.bin -ffreestanding -O2 -nostdlib boot.o kernel.o
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```
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## Getting it bootable
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You'll need grub and mtools. First move the compiled cowos.bin to isodir/boot. Then run the following command:
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```bash
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grub-mkrescue isodir/ -o cowos.iso
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```
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Now you can enjoy running this in qemu lol.
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