Tantra

 \_\_    _/_/       Tantra
     \__/           /तंत्र/ n. System (sanskrit)
     (o0)\________  Hobby unix-like x86 kernel
     (#_)\ tantra )\
         ||------w |
         ||       ||

Building

Available build profiles:

make all
make iso
make run
make qemu

Debugging

Use bochs to step into instructions and see registers in action:

make run

Roadmap

Things that are yet to be implemented:

• Fairly useful libc
• Implement syscalls and errnos (s/w based interrupts)
• Refactor and improve memory management and heap allocation (sbrk, malloc, free etc)
• Improving x86 paging and frame mapping/allocation
• Implement Virtual File System and ext2/custom-fs implementation
• Fix build system to move away from iso to a real HDD
• Init ramdisk
• Implement multitasking, COW, processes (fork etc)
• Implement scheduler for user processes
• Usermode apps: init, shell, fs related (mkdir, ls etc), cat, echo, etc.
• Support multiple cpus/core, SMP
• VGA graphics
• Networking

References

Tutorials

• The little OS book
• James Molloy's Roll your own toy unix-clone
• Brokethorn's OS dev
• OSDever Tutorial
• Writing simple OS from Scratch
• GDB Tutorial

Examples

• MIT xv6 and 6.828
• Potato teaching OS
• Adelaideos Teaching OS
• Sortix
• Aenix
• JS linux

Articles

• Intel processor manuals
• What every programmer should know about memory
• Motherboard chipsets and the memory map
• How Computers Boot Up
• Kernel boot process
• Memory Translation and Segmentation
• CPU Rings, Privilege, and Protection

Linux

• Linux Inside
• Eudyptula Challenge: Linux programming
• Linux Kernel Module Programming

Theory

• OS Study Guide
• OS: 3 Easy pieces
• Computer Science from Bottom Up
• A COMMENTARY ON THE SIXTH EDITION UNIX OPERATING SYSTEM