PureC OS

PureC OS is a simple 64-bit operating system written in C and x86_64 assembly language and a bit of C++20. It includes

• UserSpace
• Internet support only in VirtualBox I only described the interface in this block Network Support
• File system FAT32 and VFS and EXT2
• Implemented screen, keyboard and disk drivers
• Implemented USB drivers
• User Programs In Ring 3
• purec Syscall ~100
• Started porting TCC to PureC OS
• There is Login Screen and Login Gate (Ring-3) [This is for the future]

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Network Support

Intel Pro 1000 MT Desktop 82540EM Supported only in VirtualBox or QEMU

Intel Pro 1000 T Server 82543GC Supported only in VirtualBox or QEMU

PCnet-PCI II (Am79C970A) Supported only in VirtualBox or QEMU

And in the TEST branch, there is also an Atheros AR9285 driver, but it's a test version—there's almost nothing in it.

802.11 association for Wi-Fi support will be implemented for future use.

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Toolschain PureC OS

• gcc (GCC) 16.2.1 20260810
• g++ 16.2.1 20260810
• nasm 3.02 compiled on Jun 30 2026
• Limine 12.8.0
• VirtualBox Version 7.2.16 r174877
• Cross-Compiler x86_64-elf-gcc (GCC) 15.2.0
• GNU Make 4.4.1

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Details about Syscall PureC OS

Link to Syscall Reference

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Sources and Related Repositories

Kernel: pablaofficeal/My-OS-Kernel-C (this repository).

Components not residing in the kernel core are pulled in via separate repositories using fetch targets in the main Makefile (crypt-fetch, acpi-fetch, tcc-fetch, userspace-fetch); they are automatically cloned during the build process if the corresponding directory does not exist:

Repository	Directory	Purpose
PureC-OS/PureC-OS-ACPI	acpi/	ACPI subsystem: RSDP/XSDT/FADT/DSDT tables, _S5, shutdown/reboot. Source code is compiled directly into the kernel image; a relocatable bin/modules/acpi.elf module is also built.
PureC-OS/libxcrypt	libxcrypt/	SHA-512 / $6$ password hashing. Source code is compiled into the kernel; a bin/modules/crypt.elf module is also built.
PureC-OS/PureC-TCC	tcc/	C compiler (TCC port) for building Ring-3 programs within the OS.
PureC-OS/PureC-OS-Userspace	userspace/	Userspace: desktop environment, applications, and Ring-3 libraries (Rust/C).
PureC-OS/PureC-notepad-OS	notepad/	Notepad for PureC OS: a separate project containing the source code for the PureC OS Notepad; it includes its own Syscall Lib, GUI Lib, and linker script.

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Build Toolschain

Linux (Ubuntu)

On Ubuntu:

sudo apt update
sudo apt install make gcc g++ limine nasm

If not in the repositories (Old Ubuntu), then need to install limine manually.

sudo apt install xorriso mtools
git clone https://github.com/limine-bootloader/limine.git --branch=v8.x-binary --depth=1
cd limine && make

Installing Cross-Compiler for x86_64

sudo apt install build-essential bison flex libgmp-dev libmpc-dev libmpfr-dev texinfo

# Download sources

wget https://ftp.gnu.org/gnu/binutils/binutils-2.42.tar.gz
wget https://ftp.gnu.org/gnu/gcc/gcc-14.1.0/gcc-14.1.0.tar.gz

tar -xf binutils-2.42.tar.gz
tar -xf gcc-14.1.0.tar.gz

# Build binutils

mkdir build-binutils && cd build-binutils
../binutils-2.42/configure --target=x86_64-elf --prefix=/usr/local --with-sysroot --disable-nls --disable-werror
make -j$(nproc) && sudo make install
cd ..

# Build GCC

mkdir build-gcc && cd build-gcc
../gcc-14.1.0/configure --target=x86_64-elf --prefix=/usr/local --disable-nls --enable-languages=c,c++ --without-headers
make all-gcc -j$(nproc) && sudo make install-gcc
make all-target-libgcc -j$(nproc) && sudo make install-target-libgcc

Linux (Fedora)

On Fedora: ```bash sudo dnf update --refresh sudo dnf install make gcc g++ limine nasm ``` If not in the repositories (Old Fedora), then need to install `limine` manually.

sudo dnf install xorriso mtools
git clone https://github.com/limine-bootloader/limine.git --depth=1
cd limine && make

Installing Cross-Compiler for x86_64 Fedora

sudo dnf install gcc gcc-c++ make bison flex gmp-devel libmpc-devel mpfr-devel texinfo

# Download sources
wget https://ftp.gnu.org/gnu/binutils/binutils-2.42.tar.gz
wget https://ftp.gnu.org/gnu/gcc/gcc-14.1.0/gcc-14.1.0.tar.gz

tar -xf binutils-2.42.tar.gz
tar -xf gcc-14.1.0.tar.gz

# Build binutils
mkdir build-binutils && cd build-binutils
../binutils-2.42/configure --target=x86_64-elf --prefix=/usr/local --with-sysroot --disable-nls --disable-werror
make -j$(nproc) && sudo make install
cd ..

# Build GCC
mkdir build-gcc && cd build-gcc
../gcc-14.1.0/configure --target=x86_64-elf --prefix=/usr/local --disable-nls --enable-languages=c,c++ --without-headers
make all-gcc -j$(nproc) && sudo make install-gcc
make all-target-libgcc -j$(nproc) && sudo make install-target-libgcc

Linux (Arch)

sudo pacman -Syu

# Install basic dependencies
sudo pacman -S --needed base-devel git

# Install dependencies
sudo pacman -S make gcc g++ limine nasm

Download source code yay from official AUR:

git clone https://aur.archlinux.org/yay.git

Build and install yay from source code:

Navigate to the folder containing the cloned project and run the build and installation of the package:

cd yay
makepkg -si

Check the installation of yay:

yay -V

Building cross compiler for x86_64

yay -S x86_64-elf-gcc x86_64-elf-binutils

Installing VirtualBox

Package installation: Update the system and install the main package:

sudo pacman -S virtualbox

Select host kernel modules

Depending on your kernel (usually virtualbox-host-modules-arch is used for the standard Linux kernel, or virtualbox-host-dkms if you are using a custom or ZEN kernel):

sudo pacman -S virtualbox-host-modules-arch

Configuration after installation

Add your user to the vboxusers group to get access to USB devices:

sudo usermod -aG vboxusers $USER

Load kernel modules

Load the kernel modules:

sudo modprobe vboxdrv

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TODO PureC OS Project

todo.md

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Demo Foto

Boot Screen

UserSpace on the bare metal

UserSpace

System Settings

Network

Filesystem

Hex Editor

System Monitor