r3 | A tiny x86_64 kernel written in Rust

Basic x86 Interrupts - both exceptions and hardware interrupts.Programmable I/ODescriptor tables like GDT, IDT and TSSLegacy Programmable Interrupt Controller - (PIC) used for handling interrupts initiallyLegacy Programmable Interval Timer - (PIT) used for initial CPU frequency detectionCPUID - CPU features identificationTimestamp Counter (TSC) which is used as the core system timer for events generationLinear Physical Memory Manager - Right not it only allocates, never deallocates (LoL this is the biggest drawback as of now, anyways I am planning to write a slab allocator soon)DMA Manager - Allocates DMA memory regions for drivers like RTL8139Virtual Memory Manager and Paging - Allocate and manage both 4KB pages and 2MB huge-pages.Heap Allocator built on top of VMA, this heap allocator is used by rust to manage it's dynamic structures -- uses a linked list allocator underneath.Higher half kernelACPI and ACPI x2 supportLocal APIC Interrupts supportSymmetric Multi-Processing (SMP) - still in very initial stages (in progress)Peripheral Component Interconnect - legacy mode with Configuration RegistersPS/2 Keyboard DriverUART serial interface driverATA Disk controller - using PIO mode, where data-transfers take CPU cycles. (DMA mode is in planning stage yet)Framebuffer displayRandom Numbers generatorTTY interface using PS/2 and Framebuffer togetherVFS - Virtual File System implementation (Supports only crucial functionalities as of now)Devfs - to manage devices as files (good old UNIX concept - everything is a file)USTAR - A simple TAR file-system with read-only capabilitiesSystem timer and ticks built on top of TSC and LAPIC interruptsMulti-processing - ability to run multiple-processes concurrently (not parallely as of now)Multi-threading - Still in early stages, as of now, a process can have only one threadSoftware based context switching - ability to save and restore thread statesMode switching - From kernel-mode to user-mode and vice-versaNon-blocking I/O - for keyboard as of now (will implement the same for networking and disk I/O soon)Sysv64 ABI for making System callsSystem calls interface - uses legacy/portable int 0x80 software based mechanism.Basic system calls like - read, write, open, close, exit, fstat, lstat, lseek, getpid, getppid, fork, brk, sbrk, ioctl, yield, gettid, sleep, wait, shutdown, reboot, execvp, uname, getrandom, gettime are implemented, these implementations barely work and are not perfectly POSIX.Ability to load ELF files from the file-system and execute them as a process - by following the ELF process layout.Basic networking - (Still in initial stages of development, as of now you can see a half-baked RTL8139 driver implementation)Internal kernel logging via serial port used for debugging