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
• 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 batch::run_next_app() and for the first time go to userspace.

Modules

• batch
  batch subsystem
• console 🔒
  SBI console driver, for text output
• lang_items 🔒
  The panic handler
• logging 🔒
• sbi 🔒
  SBI call wrappers
• sync 🔒
  Synchronization and interior mutability primitives
• syscall
  Implementation of syscalls
• trap
  Trap handling functionality

Macros

• print
  print string macro
• println
  println string macro

Functions

• clear_bss 🔒
  clear BSS segment
• rust_main
  the rust entry-point of os