BA
barrettotte/enki-os
A basic x86 kernel to learn how operating systems get from BIOS to userland
enki-os
A basic x86 kernel to learn how operating systems get from BIOS to userland.
This is my first dive into the deep world of operating systems.
I hope to make another kernel in the future using the things I learned here.
This one still needs a lot of love and care it probably won't get.
Named after Enki,
Sumerian god of water, knowledge, crafts, and creation.
Features / Goals
- Custom bootloader
- FAT-16 file system (except
fwrite) - PS/2 keyboard driver
- Static ELF file loading
- Partial LibC
- Process create/manage via TSS
- Userland with basic shell
- Basic Multitasking (timer based)
Building Locally
- Install dependencies and build cross compiler:
make toolchain - Build OS image:
make - Build OS image and launch in QEMU:
make qemu - Build OS image and launch with GDB connected to QEMU:
make debug
TODO Items
- Proper trapping/exception handling
- Shift key
- Scrolling terminal
- Cursor support
- Clear terminal
- Init Floating Point Unit (FPU)
- Reboot command
- ACPI
- PC speaker support
- Terminal color support
- Abstraction over PIC
- Abstraction over timer
- Gather system info and print on startup (memory, timer, etc)
- Stack smash protector
- Multiboot header
- Dockerfile with toolchain installed? Github action?
Limitations
- Lazy A20 line enable; Could potentially fail on some systems
- Memory fragmentation
- Only one drive supported (master - drive 0)
- Missing FAT16 write
- ELF file loading loads entire file into heap memory...
- Only supports loading static ELF files
- Simple multitasking via timer
- Limited process control (no fork or exec)
- No threading
- Probably a lot more I'm forgetting...