docs: enrich README.md with comprehensive documentation, badges, architecture diagrams, and command guides
This commit is contained in:
RarDog
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# opencoreC: High-Performance x86_64 Microkernel OS
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# 🌟 opencoreC: High-Performance x86_64 Microkernel OS
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[-blue.svg)]()
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<div align="center">
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**opencoreC** is a modern, modular, capability-based microkernel operating system written in **Rust (`#![no_std]`)**, **Freestanding C**, and **Modern C++20**. It is designed around principles of strict hardware isolation, capability security, and zero-copy / fast-path inter-process communication (IPC).
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```text
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___ root@opencoreC
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/ \ -----------------
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| (o) | ___ OS: opencoreC Microkernel x86_64
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| | / \ Kernel: v0.1.0-release (Rust #![no_std])
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\ ___ / | (o) | Uptime: 42 mins, 12 secs
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\___/ Shell: osh (opencore shell 1.0)
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[=== opencoreC ===] Display: 1280x800 @ 60Hz 32bpp (Linear FB)
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x86_64 SMP DE / WM: LVGL v8.3 Windows/KDE Compositor
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Ring 3 Userspace CPU: QEMU Virtual CPU (4 Cores SMP)
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Fast-Path IPC Cap Memory: 38 MiB / 509 MiB (7%)
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Network: Realtek RTL8139 (10.0.2.15)
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ACPI: S5 Poweroff, Reset, MADT 4 Cores
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Security: Ring 3 Signal Fault Isolation (SIGSEGV)
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Entropy: Hardware RNG (RDRAND / TSC)
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```
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[-007acc?style=for-the-badge&logo=cpu)]()
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<p align="center">
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<b>A state-of-the-art, capability-based microkernel operating system written in Rust and modern C++20.</b><br>
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Designed from scratch for x86_64 long mode, featuring SMP multi-core affinity, an LVGL-powered desktop compositor, hardware ACPI power management, hardware random generation, and fault-tolerant process signal isolation.
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</p>
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</div>
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---
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## 🚀 Key Highlights & Subsystems
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### ⚡ 1. SMP Multi-Core & Core Affinity Optimization
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* **Application Processor Startup:** Secondary cores (Core 1, 2, 3) are booted via the Limine SMP protocol with dedicated TSS descriptors (`PER_CPU_TSS`), GDT, IDT, SSE/AVX registers, and fast-path syscall MSRs (`IA32_LSTAR`, `IA32_STAR`, `IA32_FMASK`).
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* **Fast Non-Locking CPU ID:** Uses CPU MSR `0xC0000103` (`IA32_TSC_AUX`) to retrieve the current physical core index in a single assembly instruction (`rdmsr`).
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* **Dedicated Core Affinity:**
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- **Core 0:** Microkernel Core, Hardware Timer PIT (100 Hz), Hardware IRQs (Mouse, Keyboard, RTL8139 NIC).
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- **Core 1:** Dedicated to **`gui_server`** — 60 FPS graphics rendering without lag or priority inversions.
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- **Core 2:** Dedicated to **`sh`** (Interactive shell and command execution).
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- **Core 3:** Dedicated to background servers (`init_server`, `uart_driver`, `procmgr`).
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### 🪟 2. LVGL v8.3 Windows/KDE Desktop GUI
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* **Hardware PS/2 Mouse Tracking:** Smooth double-buffered cursor rendering at 1280x800 resolution directly over Limine linear framebuffer (`0x80000000`).
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* **Zero-Lag Window Dragging:** High-performance dirty-region raster bands (`BUF_HEIGHT = 80`) and optimized composition.
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* **Windows 11 / KDE Plasma Aesthetic:**
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- Glassmorphic Taskbar with Start Menu button, running task chips, and live CMOS digital clock.
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- Interactive Start Menu with quick application launcher and system power controls.
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- **Task Manager / Resource Monitor:** Real-time multi-core CPU utilization meters across all 4 cores and physical memory progress bar.
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- **Linux-style Graphical Terminal:** Dark-mode terminal with blinking cursor and full command interpreter.
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- **About System & Network Diagnostics Center:** Real-time RTL8139 MAC, IP, and packet counters.
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### 🌐 3. Realtek RTL8139 PCI Fast Ethernet Network
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* **PCI Bus Mastering:** Auto-probes PCI bus `0:2:0`, enables Bus Master DMA.
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* **Zero-Copy Physical DMA:** Configured with physical transmit and receive ring buffers (`0x90000000`).
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* **Network Stack:** Full ARP request/reply, IPv4 packet parsing, and ICMP Echo transmission (`ping 10.0.2.2`).
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### 🛡️ 4. Process Signals & Fault Isolation (Ring 3)
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* **Kernel Stability:** Ring 3 crashes no longer trigger Kernel Panics:
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- Vector 14 (`#PF` Page Fault) $\rightarrow$ `SIGSEGV` (11)
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- Vector 13 (`#GP` General Protection) $\rightarrow$ `SIGSEGV` (11)
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- Vector 6 (`#UD` Invalid Opcode) $\rightarrow$ `SIGILL` (4)
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- Vector 0 (`#DE` Divide by Zero) $\rightarrow$ `SIGFPE` (8)
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* Faulting threads are cleanly isolated, logged with crash diagnostics (`RIP`, `ErrCode`, `CR2`), and terminated. The microkernel, GUI desktop, and sibling tasks remain fully active. Test with `crash_test`.
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### 🔋 5. Hardware ACPI Subsystem
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* **Table Discovery:** Scans BIOS memory (`0xE0000..0xFFFFF`) for `RSDP` with checksum verification.
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* **Tables Parsed:** `RSDT`, `FADT` (`PM1a_CNT`), `MADT` (LAPIC CPU Core Discovery), `HPET`, `MCFG`.
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* **Power Management:** Native hardware ACPI S5 Sleep/Poweroff and 8042/ACPI hardware reset.
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### 🎲 6. Hardware Random Number Generator (RNG)
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* **Entropy Sources:** Checks CPUID for hardware `RDRAND` (Leaf 1, ECX 30) and `RDSEED` (Leaf 7, EBX 18).
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* **PRNG Fallback:** Xorshift64* stirred with CPU cycle counter (`rdtsc`) and CMOS RTC.
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* **Syscall & Tool:** Syscall 22 (`SYS_GETRANDOM`) and user command `random` / `rng` generating UUID v4 identifiers.
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### 💻 7. Interactive Terminal Shell (`osh`)
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* **Stylized Powerline Prompt:** `┌──(root@opencoreC)-[~]\n└─# `
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* **Built-in `fastfetch`:** Integrated system information tool with custom ASCII logo and ANSI palette.
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* **Log Isolation:** Daemon logs (`gui_server`, `procmgr`, `init_server`) are routed to `dmesg`, leaving the interactive terminal pristine.
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---
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---
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## 🏛️ Architecture Overview
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## 🏛️ Architecture Overview
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The system follows a pure microkernel design paradigm where only the essential primitives reside in **Ring 0**, while device drivers, file systems, and system servers operate in isolated **Ring 3** user spaces.
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```mermaid
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```mermaid
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graph TD
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graph TD
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subgraph Ring 3 [User Space - Ring 3]
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subgraph Hardware [Physical & Virtual Hardware]
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INIT["init_server (C++20 Root Server)"]
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CPU["x86_64 SMP (4 Cores)"]
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PROCMGR["procmgr (Process & Server Manager)"]
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FB["Linear Framebuffer (1280x800@32bpp)"]
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UART_DRV["uart_driver (16550 COM1 Driver)"]
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NIC["PCI Realtek RTL8139 Fast Ethernet"]
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FS["VFS / Storage Server (Future)"]
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PS2["PS/2 Keyboard & Mouse"]
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ACPI_HW["ACPI FADT / MADT / PM1a"]
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RNG_HW["Hardware RNG (RDRAND/RDSEED)"]
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end
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end
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subgraph Ring 0 [Microkernel - Ring 0]
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subgraph Ring0 [Rust Microkernel - Ring 0]
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IPC["Fast-Path IPC Dispatcher (Registers + SHM)"]
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SCHED["SMP Scheduler (Core Affinity & Quantum)"]
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CAP["Capability Table & CNode Tracker"]
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VMM["4-Level Paging (PML4) & VMM"]
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VMM["Virtual Memory Manager (PML4 4-Level Paging)"]
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PFA["Physical Frame Allocator (Bitmap)"]
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PFA["Physical Frame Allocator (Bitmap Allocator)"]
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IPC["Fast-Path Rendezvous & Capability IPC"]
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SCHED["Thread Scheduler & Context Switch (ASM)"]
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SIG["Signal Dispatcher (SIGSEGV/SIGILL/SIGFPE)"]
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DMESG["Kernel Circular Log Ring Buffer"]
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end
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end
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INIT -- "Fast-Path IPC (Syscall)" --> IPC
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subgraph Ring3 [Isolated User Space - Ring 3]
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PROCMGR -- "Fast-Path IPC (Syscall)" --> IPC
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GUI["gui_server (LVGL Desktop Compositor) [Core 1]"]
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UART_DRV -- "Fast-Path IPC (Syscall)" --> IPC
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SH["sh (Interactive UNIX Terminal Shell) [Core 2]"]
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IPC --> CAP
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INIT["init_server (System Root Server) [Core 3]"]
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IPC --> SCHED
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UART["uart_driver (16550 Serial Driver) [Core 3]"]
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PROC["procmgr (Process & Server Manager) [Core 3]"]
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end
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Hardware <--> Ring0
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Ring0 <--> Ring3
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```
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```
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### 🔀 Language & Subsystem Distribution
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| Component | Language | Privilege | Responsibilities |
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| :--- | :--- | :--- | :--- |
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| **Microkernel Core** | **Rust** (`#![no_std]`) | Ring 0 | PFA (Physical Memory), VMM (Paging), Capabilities, Fast IPC dispatcher, Scheduler. |
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| **Low-Level Glue** | **x86_64 ASM** | Ring 0 / 3 | `_start`, `switch_to` context switch, `syscall_entry` / `sysretq`, IDT vectors. |
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| **HAL & Hardware** | **C** (`-ffreestanding`) | Ring 3 / Ring 0 | Minimal bare-metal libc, 16550 UART COM driver, PCI bus scanning, APIC/IOAPIC. |
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| **User Services** | **C++20** (`-nostdlib`) | Ring 3 | System servers, process management, RAII IPC endpoints (`ipc::Endpoint`, `ipc::SharedBuffer`). |
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---
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---
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## 📁 Repository Structure
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## 📁 Repository Structure
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```text
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```text
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opencoreC/
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opencoreC/
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├── Cargo.toml # Root Rust workspace manifest
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├── boot/
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├── rust-toolchain.toml # Fixed toolchain (x86_64-unknown-none)
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│ └── limine/ # Limine bootloader binaries & installer
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├── Makefile # Unified root build system
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├── build/ # Output directory for ELF binaries & disk image
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├── CMakeLists.txt # Alternative CMake build for C/C++ components
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├── limine.conf # Limine bootloader configuration
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├── config/
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├── config/
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│ ├── linker.ld # Higher-half kernel linker script (0xffffffff80000000)
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│ ├── linker.ld # Higher-half kernel linker script (0xffffffff80000000)
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│ └── user.ld # Userspace ELF linker script (0x400000)
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│ └── user.ld # Userspace Ring 3 ELF linker script (0x400000)
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├── hal/ # Hardware Abstraction Layer (PCI, 16550 UART)
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├── include/
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├── include/
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│ └── abi/
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│ └── abi/
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│ ├── types.h # ABI primitive types (cap_t, sysret_t, vaddr_t)
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│ ├── ipc.h # Fast-Path IPC register layout & protocols
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│ ├── syscalls.h # Syscall numbers and inline assembly wrappers
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│ ├── syscalls.h # System call numbers, structures, and POSIX signals
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│ └── ipc.h # Fast-Path IPC register layout and SHM headers
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│ └── types.h # ABI primitive types
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├── kernel/ # Microkernel crate (Rust)
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├── kernel/ # Microkernel crate (Rust #![no_std])
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│ ├── Cargo.toml
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│ ├── Cargo.toml
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│ ├── asm/
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│ ├── asm/
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│ │ ├── context.S # Cooperative/Preemptive context switcher
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│ │ ├── context.S # Preemptive context switcher (switch_to)
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│ │ └── syscall_entry.S # x86_64 fast syscall trampoline
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│ │ └── syscall_entry.S # Fast syscall/sysretq entry trampoline
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│ └── src/
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│ └── src/
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│ ├── main.rs # Kernel entry point & self-tests
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│ ├── main.rs # Kernel entry point & subsystem orchestrator
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│ ├── limine_requests.rs # Limine protocol responses (HHDM, Memmap)
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│ ├── arch/ # GDT, TSS, IDT, SMP, ACPI, Syscalls
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│ ├── arch/ # GDT, TSS, IDT, Syscall MSRs
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│ │ ├── acpi.rs # RSDP, RSDT, FADT, MADT parser & poweroff
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│ │ ├── gdt.rs # Per-CPU GDT & TSS selectors
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│ │ ├── idt.rs # IDT vectors & Ring 3 signal fault handler
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│ │ ├── smp.rs # SMP multi-core AP boot & TSC_AUX per-CPU query
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│ │ └── syscall.rs # Fast-path syscall dispatcher
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│ ├── drivers/ # Microkernel drivers
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│ │ ├── dmesg.rs # Circular kernel log ring buffer
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│ │ ├── keyboard.rs # PS/2 keyboard driver
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│ │ ├── mouse.rs # PS/2 mouse driver with screen clamping
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│ │ ├── rng.rs # Hardware RNG (RDRAND / RDSEED / PRNG)
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│ │ ├── serial.rs # 16550 UART serial logger
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│ │ └── timer.rs # PIT 8254 timer (100 Hz preemptive ticks)
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│ ├── ipc/ # Capability-based synchronous rendezvous IPC
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│ ├── mm/ # Physical Frame Allocator & 4-Level Paging
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│ ├── mm/ # Physical Frame Allocator & 4-Level Paging
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│ ├── ipc/ # Register-based Fast-Path IPC
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│ └── sched/ # Preemptive Multi-Core Scheduler & Threads
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│ └── sched/ # Thread control blocks & scheduler
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├── lib/
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├── lib/
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│ ├── libc/ # Minimal freestanding C library
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│ ├── libc/ # Minimal freestanding C library (string, stdlib, stdio)
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│ └── libipc_cpp/ # Modern C++ RAII IPC client library
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│ ├── libipc_cpp/ # C++20 RAII IPC endpoints & message wrappers
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├── hal/ # Hardware Abstraction Layer (UART, PCI, APIC)
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│ └── lvgl/ # LVGL v8.3 embedded graphics library
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└── servers/ # Ring 3 User-space servers (init, procmgr, uart_driver)
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├── servers/ # Ring 3 User-space processes
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│ ├── gui_server/ # Windows/KDE Desktop Compositor (LVGL v8.3)
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│ ├── init_server/ # System root server
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│ ├── procmgr/ # Process & server manager daemon
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│ ├── sh/ # Interactive UNIX shell (Powerline prompt & fastfetch)
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│ └── uart_driver/ # 16550 COM1 serial driver server
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├── limine.conf # Limine bootloader configuration
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├── Makefile # Unified build system
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└── README.md # Documentation & project manual
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```
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```
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---
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---
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## ⚡ Fast-Path IPC Specification
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## 🛠️ Build & Run Guide
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Short messages (up to 32 bytes of arguments) are passed directly through CPU registers without memory allocations or deep kernel stack copies:
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### Prerequisites (Ubuntu/Debian)
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```bash
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sudo apt-get update
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sudo apt-get install -y build-essential gcc g++ qemu-system-x86 nasm mtools xorriso
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curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
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rustup target add x86_64-unknown-none
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```
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* **`RAX`**: Syscall Number (`SYS_IPC_CALL = 1`, `SYS_IPC_REPLY_RECV = 2`, etc.)
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### Quick Commands
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* **`RDI`**: Target Capability Handle (`cap_t dest_cap`)
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| Target | Description |
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* **`RSI`**: IPC Opcode / Interface Method ID
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| :--- | :--- |
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* **`RDX`**: Argument 0 (`uint64_t`)
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| `make all` | Compiles the Rust microkernel, freestanding libc, drivers, and Ring 3 servers. |
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* **`R8`** : Argument 1 (`uint64_t`)
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| `make image` | Builds a bootable 64 MiB hybrid FAT32 disk image (`build/opencoreC.img`) with Limine BIOS + UEFI. |
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* **`R9`** : Argument 2 (`uint64_t`)
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| `make gui` | **Launches QEMU in GUI mode** with the LVGL Desktop Compositor, hardware mouse, and terminal. |
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* **`R10`**: Argument 3 / SHM token (`uint64_t`)
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| `make run` | **Launches QEMU in serial console mode** with `fastfetch` and the Powerline shell prompt. |
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* **Return Registers**: `RAX` (Status code), `RDX` (Result 0), `R8` (Result 1)
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| `make clean` | Cleans all compiled binaries, intermediate objects, and disk images. |
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---
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---
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## 🚀 Building & Running
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## ⌨️ Shell Command Reference (`osh`)
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### Prerequisites
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Available in both the **Serial Console (`make run`)** and the **GUI Terminal Window (`make gui`)**:
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* `rustc` & `cargo` (with target `x86_64-unknown-none`)
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| Command | Description |
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* `gcc` & `g++` (supporting C11 and C++20)
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| :--- | :--- |
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* `qemu-system-x86_64`
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| `fastfetch` / `neofetch` | Displays the system summary, ASCII logo, and ANSI color palette. |
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| `smp` / `cpu` | Displays online physical cores, current executing CPU, and per-core scheduler ticks. |
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### Quick Start
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| `acpi` | Displays ACPI RSDP status, MADT discovered cores, and FADT power management ports. |
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| `random` / `rng` | Generates 16 bytes of entropy via hardware RNG and formats as a UUID v4. |
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1. **Build all components:**
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| `crash_test` | Triggers a Ring 3 null-pointer fault to verify kernel `SIGSEGV` signal handling. |
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```bash
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| `ps` | Lists active threads, states (`READY`, `RUNNING`, `BLOCKED`), RIP, and CPU ticks. |
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make all
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| `top` | Dynamic multi-core process and CPU load monitor. |
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```
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| `mem` / `free` | Displays Physical Frame Allocator (PFA) RAM usage (Total, Used, Free). |
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| `ifconfig` / `ip` | Displays Realtek RTL8139 PCI Fast Ethernet MAC, IP, and status. |
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2. **Run in QEMU with Serial Console Output:**
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| `ping <ip>` | Transmits real ICMP Echo Ping packets over RTL8139 PCI DMA. |
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```bash
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| `dmesg` | Displays the circular kernel and background daemon log ring buffer. |
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make run
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| `date` | Queries CMOS Real-Time Clock date and time. |
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```
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| `uptime` | Displays system uptime and PIT timer clock ticks. |
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| `uname -a` | Prints operating system name, kernel version, and architecture. |
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3. **Clean build artifacts:**
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| `whoami` | Prints the active user identity (`root`). |
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```bash
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| `kill <tid>` | Sends a termination request to stop a specific thread by PID. |
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make clean
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| `calc <expr>` | Freestanding arithmetic calculator (`+`, `-`, `*`). |
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```
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| `ls` / `dir` | Lists files in the in-memory RAM disk. |
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| `cat <file>` | Reads and displays text file contents. |
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---
|
| `touch <file>` | Creates a new file in RAM disk. |
|
||||||
|
| `clear` | Clears the terminal screen. |
|
||||||
## 🗺️ Roadmap
|
| `reboot` | Reboots the machine via ACPI / 8042 reset. |
|
||||||
|
| `poweroff` / `exit` | Powers off the computer via hardware ACPI S5 shutdown. |
|
||||||
- [x] Higher-Half Limine bootloader protocol initialization (HHDM).
|
|
||||||
- [x] Physical Frame Allocator (PFA) via bitmap.
|
|
||||||
- [x] 4-Level Paging (VMM) with dynamic page table allocation.
|
|
||||||
- [x] Fast-Path register IPC infrastructure (`syscall`/`sysretq`).
|
|
||||||
- [x] Freestanding bare-metal libc and 16550 UART driver.
|
|
||||||
- [x] Modern C++ RAII IPC wrappers and initial userspace servers.
|
|
||||||
- [ ] **Phase 1:** ELF Loader, User Address Space isolation, and `iretq` jump to Ring 3.
|
|
||||||
- [ ] **Phase 2:** Synchronous IPC Rendezvous (blocking call / reply loop).
|
|
||||||
- [ ] **Phase 3:** Preemptive Multi-Tasking via LAPIC Timer interrupts.
|
|
||||||
- [ ] **Phase 4:** Userspace device driver model & interrupt forwarding.
|
|
||||||
|
|
||||||
---
|
---
|
||||||
|
|
||||||
## 📜 License
|
## 📜 License
|
||||||
|
|
||||||
Distributed under the MIT / Apache-2.0 License.
|
Distributed under the **MIT / Apache-2.0** dual license. See `LICENSE` for details.
|
||||||
|
|||||||
Reference in New Issue
Block a user