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

board 🔒

Constants used in rCore for qemu

config 🔒

Constants used in rCore

console 🔒

SBI console driver, for text output

lang_items 🔒

The panic handler

loader 🔒

Loading user applications into memory

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 string macro

println

println string macro

Functions

clear_bss 🔒

clear BSS segment

rust_main

the rust entry-point of os