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EvoOS Kernel Structure Outline

1. Core Kernel

  • Kernel Initialization: Bootloader and initial setup.
  • Memory Management: Handle memory allocation, paging, and segmentation.
  • Process Management: Process creation, scheduling, and termination.
  • File System Management: Ext4-based filesystem with APK handling capabilities.
  • Device Drivers: Basic drivers for essential hardware components.

2. File System Layer

  • VFS (Virtual File System): Interface for different filesystems.
  • ext4+ (Hybrid ext4 Filesystem): Modified ext4 with APK-specific enhancements.
    • Inode Management: Extend inodes to store APK metadata.
    • Directory Management: Handle directories containing both regular files and APKs.
    • File Operations: Custom operations for reading, writing, and executing APK files.
  • APK Handler: Specialized handler for APK files.
    • Metadata Extraction: Extract and manage APK metadata (e.g., AndroidManifest.xml).
    • APK Execution: Support for executing APK files on mobile devices.

3. Memory Management

  • Physical Memory Management: Manage physical memory and allocation.
  • Virtual Memory Management: Implement paging and virtual address space management.
  • Cache Management: Optimize performance with caching strategies.

4. Process Management

  • Process Scheduler: Manage CPU time allocation to processes.
  • Inter-Process Communication (IPC): Mechanisms for processes to communicate and synchronize.
  • System Calls: Interface for user-space applications to interact with the kernel.

5. Device Drivers

  • Block Device Drivers: For storage devices (e.g., hard drives, SSDs).
  • Character Device Drivers: For devices like keyboards and serial ports.
  • Network Device Drivers: For networking hardware.

6. Security

  • Access Control: File permissions and access control lists (ACLs).
  • User Authentication: Mechanisms for user login and authentication.
  • Encryption: Support for encrypted files and secure communications.

7. User Interface

  • Command-Line Interface (CLI): Basic shell for interacting with the system.
  • Graphical User Interface (GUI): Interface for desktop and mobile environments.

Detailed Component Description

1. Core Kernel

Kernel Initialization

  • Bootloader: Initializes the kernel and sets up the environment.
  • Kernel Setup: Sets up interrupt handling, system timer, and other essential services.

Memory Management

  • Physical Memory Manager: Manages physical memory allocation.
  • Virtual Memory Manager: Manages virtual memory, including paging and segmentation.
  • Cache Manager: Implements caching strategies to improve performance.

Process Management

  • Scheduler: Implements process scheduling algorithms (e.g., round-robin, priority scheduling).
  • IPC Mechanisms: Includes pipes, message queues, shared memory, and semaphores.
  • System Calls: Provides an interface for user-space applications to request kernel services.

2. File System Layer

VFS (Virtual File System)

  • Abstract layer that provides a common interface for different filesystems.

ext4+ (Hybrid ext4 Filesystem)

  • Inode Management: Extend the inode structure to store additional metadata for APK files. 
    struct ext4_inode {
    // Existing ext4 inode fields
    ...
    // Custom fields for APK metadata
    __le32 apk_metadata_offset;
    __le32 apk_metadata_size;
};
  • Directory Management: Handle directories with mixed content (regular files and APKs).
  • File Operations: Implement custom operations for handling APK-specific tasks.
  • APK Handler: Specialized module for managing APK files.
    • Metadata Extraction: Extract APK metadata and manage it within the filesystem.
    • APK Execution: Support execution of APKs on mobile devices.

3. Memory Management

Physical Memory Management

  • Manages allocation and deallocation of physical memory blocks.

Virtual Memory Management

  • Implements paging and segmentation to provide virtual memory spaces for processes.
  • Handles page faults and manages page tables.

Cache Management

  • Implements strategies like LRU (Least Recently Used) for caching frequently accessed data.

4. Process Management

Process Scheduler

  • Implements various scheduling algorithms to manage CPU time allocation.

Inter-Process Communication (IPC)

  • Provides mechanisms for processes to communicate and synchronize.
  • Includes pipes, message queues, shared memory, and semaphores.

System Calls

  • Provides a user-space interface for kernel services.
  • Includes calls for process management, file operations, and IPC.

5. Device Drivers

Block Device Drivers

  • Manage storage devices such as hard drives and SSDs.
  • Implement read and write operations.

Character Device Drivers

  • Manage devices like keyboards, mice, and serial ports.
  • Implement character-based I/O operations.

Network Device Drivers

  • Manage network interfaces and provide support for network communication.

6. Security

Access Control

  • Implement file permissions and ACLs to control access to files and directories.

User Authentication

  • Provide mechanisms for user login and authentication.

Encryption

  • Support encrypted files and secure communications.

7. User Interface

Command-Line Interface (CLI)

  • Provide a basic shell for interacting with the system.
  • Support standard shell commands and scripting.

Graphical User Interface (GUI)

  • Provide a desktop environment for desktop systems.
  • Provide a mobile interface for mobile devices.