This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

User Mode

Zephyr offers the capability to run threads at a reduced privilege level which we call user mode. The current implementation is designed for devices with MPU hardware.

For details on creating threads that run in user mode, please see Lifecycle.

• Overview
  • Threat Model
  • High-level Policy Details
  • Constraints
• Memory Protection Design
  • Boot Time Memory Configuration
  • Hardware Stack Overflow
  • Thread Stack
  • Thread Resource Pools
  • Memory Domains
  • Configuration Options
  • API Reference
• Kernel Objects
  • Object Placement
  • Dynamic Objects
  • Supervisor Thread Access Permission
  • User Thread Access Permission
  • Initialization State
  • Creating New Kernel Object Types
  • Configuration Options
  • API Reference
• System Calls
  • Components
  • C Prototype
  • Implementation Function
  • Verification Function
  • Configuration Options
  • APIs
• MPU Stack Objects
  • Thread Stack Creation
  • Stack Guards
  • Memory Placement
• MPU Backed Userspace