Module os::loader

Loading user applications into memory

For chapter 3, user applications are simply part of the data included in the kernel binary, so we only need to copy them to the space allocated for each app to load them. We also allocate fixed spaces for each task’s KernelStack and UserStack.

Structs

• KernelStack 🔒
• UserStack 🔒

Statics

• KERNEL_STACK 🔒
• USER_STACK 🔒

Functions

• get_base_i 🔒
  Get base address of app i.
• get_num_app
  Get the total number of applications.
• init_app_cx
  get app info with entry and sp and save TrapContext in kernel stack
• load_apps
  Load nth user app at [APP_BASE_ADDRESS + n * APP_SIZE_LIMIT, APP_BASE_ADDRESS + (n+1) * APP_SIZE_LIMIT).