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
• mm: Address map using SV39
• sync:Wrap a static data structure inside it so that we are able to access it without any unsafe.

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_tasks() 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