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README.md
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# banan-os
This is my hobby operating system written in C++. Currently supports only x86_64 architecture. We have a read-only ext2 filesystem, read-write ramfs, IDE disk drivers in ATA PIO mode, userspace processes, executable loading from ELF format, linear VBE graphics and multithreaded processing on single core.
This is my hobby operating system written in C++. Currently supports only x86_64 architecture. We have a read-only ext2 filesystem, read-write ramfs, IDE disk drivers in ATA PIO mode, ATA AHCI drivers, userspace processes, executable loading from ELF format, linear VBE graphics and multithreaded processing on single core.
![screenshot from qemu running banan-os](assets/banan-os.png)
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There does not exist a complete list of needed packages for building. From the top of my head I can say that *cmake*, *ninja*, *make*, *grub*, *rsync* and emulator (*qemu* or *bochs*) are needed.
You can and *should* pass cmake variable QEMU_ACCEL set to proper accelerator to cmake commands. For example on Linux this means adding -DQEMU_ACCEL=kvm to the end of all cmake commands.
Create the build directory and cofigure cmake
```sh
mkdir build
cd build
cmake ..
```
To build the toolchain for this os. You can run the following command.
> ***NOTE:*** The following step has to be done only once. This might take a long time since we are compiling binutils and gcc.
```sh
ninja toolchain
cmake --fresh .. # We need to reconfigure cmake to use the new compiler
ninja libstdc++
./script/build.sh toolchain
```
To build the os itself you can run either of the following commands. You will need root access since the sysroot has "proper" permissions.
To build the os itself you can run one of the following commands. You will need root access since the sysroot has "proper" permissions.
```sh
ninja qemu
ninja bochs
./script/build.sh qemu
./script/build.sh qemu-nographic
./script/build.sh qemu-debug
./script/build.sh bochs
```
You can also build the kernel or disk image without running it:
```sh
ninja kernel
ninja image
./script/build.sh kernel
./script/build.sh image
```
If you have corrupted your disk image or want to create new one, you can either manually delete *banan-os.img* and cmake will automatically create you a new one or you can run the following command.
If you have corrupted your disk image or want to create new one, you can either manually delete *build/banan-os.img* and build system will automatically create you a new one or you can run the following command.
```sh
ninja image-full
./script/build.sh image-full
```
> ***NOTE*** ```ninja clean``` has to be ran with root permissions, since it deletes the root filesystem.
> ***NOTE*** ```ninja clean``` has to be ran with root permissions, since it deletes from the banan-so sysroot.
### Contributing