what is mya

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

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.

docs

• episode 0: introduction to the journey of making tiny OS
  
  
  

  [introduction]

• episode 1: my understanding of CPU and Memory interaction
  
  
  

  [the need for labels, era of uni programming and multiprogramming, linker and Hardware/software based relocation, segmentationm, OS loader]

• episode 2: write our very first tiny bootloader
  
  
  

  [ flat binary, assembler base address, org directive, far jump ]

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  [ writing a simple bootloader, using bios interrupt 0x10, qemu kickstart ]

• episode 3: Tracing Stack and Function Calls with GDB
  
  
  

  [ stack registers: SS, SP, BP ]

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  [ start using GDB, define stack, add some functionality to bootloader, start using makefile, trace stack ]

• episode 4: CPU interaction with memory and IO
  
  
  

  [ 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 ]

• episode 5: switch to protected mode
  
  
  

  [ Global Descriptor Table (GDT), CHS addressing, absolute vs relative addressing, protectd mode ]

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  [ writing second stage bootloader, implementing GDT, switch to protected mode, using bios interrupt 0x13 and CHS ]

• episode 6: migrate preparation
  
  
  

  [ why migrate to c ]

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  [ build toolchain (GCC, linker, assembler) ]

• episode 7: migrate to C
  
  
  

  [ linker script, compiler and linker options: -nostdlib -lgcc -ffreestanding , C compilation environment: Freestanding and Hosted, C call conventions ]

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  [ writing linker script, migrate from assembly to C, start writing kernel with C ]

Upcoming episodes

More episodes will be determined soon.

other media

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