staycool1374-ger/nexios

How staycool1374-ger/nexios works

NexIOS is a freestanding real-time operating system whose central workflow is launching user programs under kernel control: a user enters commands through the shell, the kernel loads ELF tasks, maps their address spaces, grants capabilities, and schedules them. System calls connect tasks to kernel services such as IPC, filesystems, and synchronization; architecture-specific code handles hardware interrupts and faults. The README also describes process isolation and fault termination, while filesystem, driver, and network components are visible in the tree. Some subsystem links are documented capabilities rather than verified calls in the sampled source.

Main entry points: syscall.cpp System calls · elf_loader.cpp ELF loader · vfs.cpp Virtual filesystem · driver.cpp Device drivers

Components 19

User interface

Shell src/services/shell.cpp
Terminal src/services/terminal/terminal.cpp
User programs userspace/user-app.c

Process execution

ELF loader src/kernel/elf/elf_loader.cpp
Task management src/kernel/task/task.cpp
Real-time scheduler src/kernel/task/scheduler.cpp
Fault handling src/kernel/arch

Kernel services

System calls src/kernel/syscall/syscall.cpp
IPC src/kernel/ipc/ipc.cpp
Virtual filesystem src/kernel/vfs/vfs.cpp
Synchronization src/kernel/sync/sync.cpp

Memory and security

Capabilities src/kernel/cap/cap.cpp
Virtual memory src/kernel/memory/vmm.cpp
Physical memory src/kernel/memory/pmm.cpp

Platform I/O

Initrd src/initrd/initrd.cpp
Device drivers src/kernel/driver/driver.cpp
Network stack src/kernel/net/net.cpp
Architecture HAL src/kernel/arch/hal/interrupt_controller.hpp

Other components

User

Connections 19

User → Terminal: enters commands
Terminal → Shell: forwards input
Shell → ELF loader: loads ELF
ELF loader → Task management: creates task
Task management → Real-time scheduler: schedules task
User programs → System calls: requests services
System calls → Virtual filesystem: dispatches filesystem calls
System calls → IPC: dispatches IPC calls
System calls → Capabilities: checks capabilities
System calls → Synchronization: dispatches sync calls
ELF loader → Virtual memory: maps address space
Virtual memory → Physical memory: allocates frames
ELF loader → Capabilities: sets capability domain
Fault handling → Task management: terminates faulting task
Fault handling → Architecture HAL: handles architecture traps
Virtual filesystem → Initrd: reads initrd files
Virtual filesystem → Device drivers: serves device files
Device drivers → Architecture HAL: uses hardware interface
Device drivers → Network stack: supports network devices

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Drawn by GitDiagram on September 27, 2026 from the repository's file tree, README and source files. Read as Markdown ·