Crate os

The main module and entrypoint

Various facilities of the kernels are implemented as submodules. The most important ones are:

• trap: Handles all cases of switching from userspace to the kernel
• task: Task management
• syscall: System call handling and implementation

The operating system also starts in this module. Kernel code starts executing from entry.asm, after which rust_main() is called to initialize various pieces of functionality. (See its source code for details.)

We then call task::run_first_task() and for the first time go to userspace.

Modules

• config
  Constants in the kernel
• console 🔒
  SBI console driver, for text output
• lang_items
  The panic handler
• loader 🔒
  Loading user applications into memory
• logging
  Global logger
• mm
  Memory management implementation
• sbi
  SBI call wrappers
• sync
  Synchronization and interior mutability primitives
• syscall
  Implementation of syscalls
• task
  Task management implementation
• timer
  RISC-V timer-related functionality
• trap
  Trap handling functionality

Macros

• print
  Print! to the host console using the format string and arguments.
• println
  Println! to the host console using the format string and arguments.

Functions

• clear_bss 🔒
  clear BSS segment
• kernel_log_info 🔒
  kernel log info
• rust_main
  the rust entry-point of os