The Avery Kernel

The Avery Kernel is a modern open-source operating system kernel written in C++. It serves as the foundation of mOS and represents the second major generation of Avery.

Avery aims to be a clean, educational, and extensible kernel, built from the ground up with modern software engineering practices while remaining approachable to contributors and learners alike.

Roadmap (to Alpha)

Foundation

• Serial output
• Framebuffer abstraction + character output
• Panic functions + Assertion system
• Logging system (both visual + serial)
• Halt loop
• Basics of the kernel + GDT, IDT and interrupt handlers
• PIC, timer and keyboard support
• Stack tracing support

Memory

• Limine Memory map parsing
• Physical memory manager
• Virtual memory manager
• Kernel heap (malloc, free)
• Create classes and helpers with the heap

Internal Driver Framework

• Device objects
• Driver registration
• Driver lifecycle
• MMIO port I/O helpers
• Block device abstraction
• Move to Limine 6 barely (APIC or x2APIC mapped to legacy PIC)

Hardware discovery

• PCI enumeration
• PCI BAR support

Storage

• ATA driver
• Block device layer
• VFS
• FAT32
• Read & Write files

Processes

• Create user mode
• Basic scheduler
• Read ELF executables
• System calls
• Create userland (shell + init process)

Roadmap (for Beta)

Beta 1

• Avery Kernel SDK
• Driver build system
• Driver templates
• Driver documentation
• Loadable modules
• Driver manifest format
• Sample PCI driver
• Sample block driver
• Sample character driver
• Stable kernel driver API

Beta 2

• ACPI
• MADT parsing
• x2APIC and APIC
• APIC timer
• IPIs

Beta 3

• xHCI
• USB enumeration
• USB keyboard
• USB mouse
• USB mass storage
• USB hubs

Beta 4

• Ethernet driver (E1000 first)
• Ethernet layer
• ARP
• IPv4
• ICMP
• UCP
• TCP
• DNS
• DHCP

Beta 5

• USB Bluetooth adapter support
• HCI layer
• L2CAP
• HID over Bluetooth
• Bluetooth keyboard and mouse

Beta 6

• Intel HDA
• Audio Mixer
• PCM playback
• Basic Sound API

Beta 7

• Better graphics abstraction
• Font renderer
• Mouse cursor
• Window manager
• Simple compositor
• Terminal app
• File manager

Beta 8

• Port binutils
• Port Clang
• libc
• C examples
• Build programs for Avery

Beta 9

• Self-hosting

Beta 10

• Graphics API

Beta 11

• Users/groups
• Permissions
• Process isolation
• ASLR
• NX
• Sandboxing
• Driver permissions/signing