aceOS Enhanced v2.0

An advanced bootable operating system featuring a 16-bit bootloader that launches a 32-bit kernel with virtual memory management, preemptive multitasking, and disk I/O capabilities.

Features

Core System

• 16-bit Bootloader: Loads the kernel from disk into memory
• 32-bit Protected Mode Kernel: Advanced kernel with comprehensive system management
• Virtual Memory Management: Complete paging system with page directories and tables
• Physical Memory Manager: Bitmap-based frame allocation with 30MB+ support
• Enhanced Heap Manager: Best-fit allocator with corruption detection and validation
• Interrupt System: IDT setup with keyboard, serial, and timer interrupts
• Serial Debug Output: COM1 port debugging support
• VGA Text Mode: 80x25 character display

Advanced Memory Management

• Paging System: Full x86 paging with virtual-to-physical address translation
• Memory Protection: Kernel/user space separation (framework ready)
• Dynamic Allocation: Advanced heap with block splitting and merging
• Memory Validation: Real-time heap corruption detection
• Alignment Support: Proper memory alignment for optimal performance

Multitasking & Scheduling

• Process Management: Complete PCB (Process Control Block) implementation
• Round-Robin Scheduler: Preemptive multitasking with time slicing
• Context Switching: Full CPU context save/restore
• Process States: Running, ready, blocked, terminated state management
• Priority Scheduling: High, normal, and low priority process support

Enhanced I/O Systems

• Timer Driver: Programmable Interval Timer with 1000Hz precision
• System Clock: Real-time system uptime tracking
• Disk I/O: ATA/IDE hard disk support with LBA addressing
• Drive Detection: Automatic detection and identification of storage devices
• Disk Testing: Built-in read/write verification system

Comprehensive Filesystem

• In-Memory Filesystem: Complete hierarchical file system
• Directory Support: Nested directories with full path navigation
• File Operations: Create, read, write, copy, move, delete
• Current Working Directory: Shell maintains directory context
• Search Functionality: Find files by name patterns
• Tree View: Visual directory structure display
• File Metadata: Size, type, and creation information

Shell Commands

• help - Show available commands
• clear - Clear the screen
• version - Show OS version
• echo <text> - Echo text to screen
• debug - Send debug info to serial port

Directory Navigation

• pwd - Show current working directory
• cd <path> - Change directory (supports . and ..)
• ls [path] - List directory contents

File Management

• mkdir <path> - Create directories
• touch <path> - Create empty files
• cat <path> - Display file contents
• write <path> <content> - Write content to files
• cp <source> <destination> - Copy files
• mv <source> <destination> - Move/rename files
• rm <path> - Remove files or directories

Filesystem Tools

• find <pattern> - Search for files by name pattern
• tree [path] - Display directory tree structure
• stat <path> - Show detailed file information
• fsinfo - Display filesystem statistics

System Management Commands

• meminfo - Display memory usage and heap statistics
• diskinfo - Show all detected disk drives and their information
• timer - Display system timer and uptime statistics
• ps - Show process information and scheduler statistics
• test - Run comprehensive system tests

Building and Running

Using Docker (Recommended for Windows)

docker-compose up -d
docker-compose exec aceos-dev make clean
docker-compose exec aceos-dev make
docker-compose exec aceos-dev qemu-system-i386 -fda os_image.img

Using Build Scripts

# Linux/Mac
./build-and-run.sh

# Windows
./build-and-run.bat

Manual Build

make clean
make
qemu-system-i386 -fda os_image.img

Filesystem Specifications

• Maximum Directories: 32
• Maximum Files: 128
• Files per Directory: 64
• Filename Length: 32 characters
• Path Length: 256 characters
• Storage: Dynamic memory allocation for file content

Architecture

aceOS/
├── boot/           # 16-bit bootloader assembly
├── kernel/         # 32-bit kernel C code
├── drivers/        # Device drivers (keyboard, serial, filesystem)
├── include/        # Header files
└── src/libc/      # C standard library implementation

Example Usage

aceOS> help
aceOS> mkdir /home
aceOS> cd /home
aceOS> touch test.txt
aceOS> write test.txt Hello from aceOS!
aceOS> cat test.txt
aceOS> cp test.txt backup.txt
aceOS> ls
aceOS> tree /
aceOS> find test
aceOS> stat test.txt

Development

Built with:

• NASM for assembly code
• GCC for C code compilation
• Docker for consistent build environment
• QEMU for testing and emulation