Awesome

what is mya

mya is a fun project to create a tiny OS from scratch using x86 assembly and C programming language. <br><br><br>

how to use

You can either read each episode from the doc section or Medium.

For each episode that includes code, there is a corresponding release with the same name as the episode. <br><br><br>

docs

• episode 0: introduction to the journey of making tiny OS <br><br> <br><dl><dd><dl><dd><dl><dd>[introduction]</dd></dl></dd></dl></dd></dl> <br>

• episode 1: my understanding of CPU and Memory interaction <br><br> <br><dl><dd><dl><dd><dl><dd>[the need for labels, era of uni programming and multiprogramming, linker and Hardware/software based relocation, segmentationm, OS loader]</dd></dl></dd></dl></dd></dl> <br>

• episode 2: write our very first tiny bootloader <br><br> <br><dl><dd><dl><dd><dl><dd>[ flat binary, assembler base address, org directive, far jump ]</dd></dl></dd></dl></dd></dl><hr> <br><dl><dd><dl><dd><dl><dd>[ writing a simple bootloader, using bios interrupt 0x10, qemu kickstart ]</dd></dl></dd></dl></dd></dl> <br>

• episode 3: Tracing Stack and Function Calls with GDB <br><br> <br><dl><dd><dl><dd><dl><dd>[ stack registers: SS, SP, BP ]</dd></dl></dd></dl></dd></dl><hr> <br><dl><dd><dl><dd><dl><dd>[ start using GDB, define stack, add some functionality to bootloader, start using makefile, trace stack ]</dd></dl></dd></dl></dd></dl> <br>

• episode 4: CPU interaction with memory and IO <br><br> <br><dl><dd><dl><dd><dl><dd>[ cpu interaction with RAM and ROM via address and control bus, CPU address space, binary black magic, Memory mapped I/O, Isolated mapped I/O ]</dd></dl></dd></dl></dd></dl> <br>

• episode 5: switch to protected mode <br><br> <br><dl><dd><dl><dd><dl><dd>[ Global Descriptor Table (GDT), CHS addressing, absolute vs relative addressing, protectd mode ]</dd></dl></dd></dl></dd></dl><hr> <br><dl><dd><dl><dd><dl><dd>[ writing second stage bootloader, implementing GDT, switch to protected mode, using bios interrupt 0x13 and CHS ]</dd></dl></dd></dl></dd></dl> <br>

• episode 6: migrate preparation <br><br> <br><dl><dd><dl><dd><dl><dd>[ why migrate to c ]</dd></dl></dd></dl></dd></dl><hr> <br><dl><dd><dl><dd><dl><dd>[ build toolchain (GCC, linker, assembler) ]</dd></dl></dd></dl></dd></dl> <br>

• episode 7: migrate to C <br><br> <br><dl><dd><dl><dd><dl><dd>[ linker script, compiler and linker options: -nostdlib -lgcc -ffreestanding , C compilation environment: Freestanding and Hosted, C call conventions ]</dd></dl></dd></dl></dd></dl><hr> <br><dl><dd><dl><dd><dl><dd>[ writing linker script, migrate from assembly to C, start writing kernel with C ]</dd></dl></dd></dl></dd></dl>

Upcoming episodes

More episodes will be determined soon.

other media

You can also access these episodes on Medium via this link: flydeoo