1.2 KiB
Blank OS Developer's Manual
Getting Started
System description
Blank OS runs on a monolithic kernel booted by a 3rd party bootloader; GRUB (whose executable is named stage2_eltorito). The kernel is compiled in ELF format. The target processor architecture is 32-bit x86. Blank OS is BIOS-independent which means it does not use Real mode BIOS functions as its routines. It rather uses in and out port communication to communicate with hardware directly (such as the keyboard) and it uses specific memory locations (for example the framebuffer to manage the screen in text mode).
Code structure
The source code is available in folder src. You will find subfolders corresponding to appropriate system parts, such as the kernel, the C library (including drivers) and programs.
Making programs for the OS
Programming
Basically you can use the kernel C library functions available in src/libc/ and make programs out of those functions. Then you can set up the shell for your program to be launchable.
More on that soon.
Compiling and linking
The linking process should be taken care by the appropriate Linker script link.ld and the Makefile instructions and targets.