path: root/mu-init.subx

# Initialize the minimal runtime for Mu programs.
#
# See translate for how this file is used.
#
# Mu programs start at a function called 'main' with this signature:
#   fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk)
#
# All tests must pass first (the "power-on unit test").

== code

Entry:
  # initialize stack
  bd/copy-to-ebp 0/imm32
  (main 0 0 Primary-bus-secondary-drive)
#?   # always first run tests
#?   (run-tests)
#?   (num-test-failures)  # => eax
#?   # call main if tests all passed
#?   {
#?     3d/compare-eax-and 0/imm32
#?     75/jump-if-!= break/disp8
#?     (clear-real-screen)
#?     c7 0/subop/copy *Real-screen-cursor-x 0/imm32
#?     c7 0/subop/copy *Real-screen-cursor-y 0/imm32
#?     (main 0 0 Primary-bus-secondary-drive)
#?   }

  # hang indefinitely
  {
    eb/jump loop/disp8
  }