A basic x86 operating system in development

Files:

• CMakeLists.txt - CMake build config
• Toolchain-i686-elf.cmake - Config cross compilation

/src

• init.asm - The first code to be executed
• main.c, main.h - Main init & OS logic.
• multiboot.asm - Multiboot config.
• linker.ld - Linker config.
• gdtlib.c, gdtlib.h - Global Descriptor Table generic library
• gdt.c, gdt.asm, gdt.h - Global Descriptor Table configuration and initialization specific for PYROS
• idtlib.c, idtlib.h - Interrupt Descriptor Table generic library
• idt.c, idt.asm, idt.h - Interrupt Descriptor Table configuration and initialization specific for PYROS
• timer.c, timer.h - System timer logic.
• sched.c, sched.h - Scheduler.

• CMake & Make
• Cross-Compiled i686-elf-gcc
• qemu-system-i386

Clion is Highly Recommended

Building (Development Build):

$ ./build.sh

Running:

$ qemu-system-i386 -kernel cmake-build-debug/pyros.elf -monitor stdio

Debugging:

$ qemu-system-i386 -S -gdb tcp::1234 -kernel cmake-build-debug/pyros.elf -monitor stdio

And in gdb

file ./cmake-build-debug/pyros.elf
target remote localhost:1234