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Add more readmes to describe XTOS components and source code tree directories
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Rafal Kupiec 2023-05-18 21:24:26 +02:00
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## Cmake Build System
This directory contains a set of .cmake files that provide the necessary configuration and functionality for the build
process. These files provide the necessary toolchain configuration, additional functions for the build system, and QEMU
configuration for testing the XT Operating System.

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## Open Virtual Machine Firmware (OVMF)
This directory contains the essential components of the Open Virtual Machine Firmware (OVMF), which provides
an open-source implementation of the Unified Extensible Firmware Interface (UEFI) for virtual machines.
The ovmf_code files contain the CPU architecture specific UEFI firmware code, which serves as the initial boot code
for virtual machines used to test the XTOS. It includes the necessary instructions and functions to initialize hardware,
load the operating system, and provide various system services during the boot process. The ovmf_code file is
responsible for establishing a UEFI environment within the virtual machine, enabling it to boot and operate effectively.
The ovmf_vars files, store UEFI variables, which are used to store and retrieve system configuration information, such as
boot options, device settings, and system preferences. The ovmf_vars file contains the persistent variables specific to
a virtual machine, allowing it to maintain its configuration across multiple boot sessions.

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## XT Loader (XTLDR)
The XTLDR, or XTOS Boot Loader, is an EFI (Extensible Firmware Interface) boot loader specifically designed for XTOS.
As an EFI boot loader, XTLDR operates exclusively with EFI-based hardware and is not compatible with non-EFI systems,
like old and deprecated BIOS.
One of the notable features of XTLDR is its modular design. The boot loader is divided into different modules, with only
the essential core being loaded during the boot process. This modular approach allows for a more efficient and
streamlined boot experience, as only the necessary functionality is loaded, reducing the boot time and system resource
usage.
XTLDR includes various modules that provide specific functionalities required for the boot process. For example, there is
a module dedicated to supporting the XTOS boot protocol, which is the specific protocol used by XTOS for loading and
executing the OS kernel. Additionally, there is a module for handling PE/COFF (Portable Executable) binaries, which is
a commonly used format of executable files used by the XTOS.