ArGOS OPERATING SYSTEM

Fatto da Alberto Girardi, a San Vito, Friuli, Italia

Ad gloriam humanitatis

12/09/2023

GOAL: building an OS totally from scratch. Have fun along the way. Learning assembly language, low level management of memory and execution, C language implementation and low level usage, kernel architectures and abstraction layers.

To be used on qemu, (booting as a flat binary for now).
Totally insecure. Complete possibility of memory acces.
in developement

Initial inspiration spark: jdh's "Tetris OS". First steps following nanobyte OS and Making an OS (x86)
Extrely useful information from osdev.org

HOW TO COMPILE AND RUN and USE

REQUIREMENTS:

i686-elf cross compiler, GNU gcc and ld, with libgcc
nasm
qemu
make

compile:

make

makefile targets:

make tclean    ;deletes build directory
make clean     ;deletes other tmp build files, only final image remains
make recomp    ;tclean and then compiles
make odump     ;objdump of all .o files

boot:

make run

reboot from inside: press "r"

DOCUMENTATION

doc file
execution controll

HISTORY LOG

FIRST CRUDE BOOTLOADER TEST: 12/09/2023 23:04
in the following weeks
first function: 21/9/2023
print function, loops, arithmetic functions tests, playing around, end of asm tests 2 22/09/2023
function that prints a decimal number 24/09/2023
Understanding of asm memory model, stack
passing function argument to the stack 29/09/2023
getting user input via keyboard 05/09/2023
rebooting
reading from the disk (crude test 14/10/2023)
read from disk and load to memory function and stage 2 bootloader: 15/10/2023
ENTER 32 BIT MODE (gdt, new segments) 19/10/2023
32 bit coding in the following days, reimplementing old functions
c kernel working 25/10/2023
kernel lib linking
vga drivers 27/10/2023
problems with global variables
problem solved 2/11/2023
implemented integer and hex printing function 3/11/2023

CURRENT PLAN

printf
terminal and scrolling, changing vga mode
interrupts