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x86_64 bootloader and operating system

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Name		Name	Last commit message	Last commit date
Latest commit History 55 Commits
arch/x86_64		arch/x86_64
bootloader/x86_64		bootloader/x86_64
docs		docs
drivers		drivers
include		include
kernel		kernel
libk		libk
scripts		scripts
.gitignore		.gitignore
LICENSE		LICENSE
Makefile		Makefile
README		README
TODO		TODO

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povOS
=====

x86_64 operating system.

Author:  Giovanni Santini
Mail:    giovanni.santini@proton.me
License: MIT


Features
--------

- custom bootloader
- custom standard library
- GDT and paging
- drivers:
  - ps2
  - uart
  - vga
  - pic
  - keyboard
- kernel:
  - IDT and ISR
  - input (supports multiple keyboard layouts)
  - textbuffer
  - console
  - tty

The implementation is clean and readable, headers = documentation.


The boot sequence
-----------------

The BIOS boot sequence for x86_64 looks like this:

 - CPU starts executing in 16-bit real mode, with BIOS access
 - Use the bios to load the rest of the bootloader
 - Setup and load the GDT with a flat memory layout
 - Go to protected mode
 - Enable the A20 line
 - Setup GDT again
 - Setup the page table
 - Enable long mode
 - Call the main routine