Emyx

Emyx is an ealry-stage operating system with a kernel and libc written from scratch.

Progression

• Bootable ISO (GRUB/Multiboot)
• VGA text-mode terminal output
• UART serial debug (COM1)
• GDT and IDT setup and load
• CPU exceptions (0-31) with panic diagnostics
• PIC remap and IRQ controller helpers (mask/unmask, EOI)
• IRQ0 timer ticks (PIT configured)
• IRQ1 keyboard press decoding
• Kernel shell with utility commands (help, clear, ticks, irq, panic, reboot)
• Physical memory managment
• Virtual memory managment (identity paging)
• Basic kernel heap allocator (kmalloc, kfree)

Prerequisites

• Cross toolchain for i686-elf (i686-elf-gcc, i686-elf-ar, ...)
• grub-mkrescue
• qemu-system-i386

Toolchain setup notes: docs/cross-compiler.md

Quick start

git clone https://github.com/j1banez/emyx.git
cd emyx
make run

Use make help for more information.

Debug

make gdb

# In another terminal
gdb kernel/emyx.kernel

In GDB:

(gdb) target remote :1234
(gdb) b kmain
(gdb) c
(gdb) bt
(gdb) info registers
(gdb) n
[...]