ISO 9660 File System

Explores ISO 9660 file systems and loads the kernel file into memory using low-level Block I/O operations which reads 2KB raw blocks. Block I/O provides a low level implementation to read a file regardless of the file system type.

C

This folder includes an implementation in C to traverse through an ISO file (ISO 9660 File Systems) and prints out relevant information such as file names and sizes. Can be extended to print other information.

How to run?

• Path to the iso file has to be provided in main.c and isoMethods.c in the function check_kernel_file().
• Navigate to base folder and run make.
• Then run ./main to execute the program.

UEFI

This folder includes an implementation to perform higher-level operations (reading a file) using the low-level block I/O operations in UEFI. This code reads the ISO file (ISO 9660 file system), and loads the kernel into memory.

Tools:

• build-essential, clang, lld, mkisofs, virtualbox. (install with sudo apt install)
• Clone this repository - https://github.com/rusnikola/fwimage in the same folder where Code and Include folders are present.
• VirtualBox

How to run?

• Navigate to UEFI/Code folder and run make.sh which creates boot.iso.
• Load the boot.iso into a virtual machine in VirtualBox with UEFI enabled.

References

• https://wiki.osdev.org/ISO_9660
• https://wiki.osdev.org/Reading_sectors_under_UEFI
• https://uefi.org/sites/default/files/resources/UEFI%20Spec%202.8B%20May%202020.pdf