1 # Initialize the minimal runtime for Mu programs.
 2 #
 3 # See translate for how this file is used.
 4 #
 5 # Mu programs start at a function called 'main' with this signature:
 6 #   fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk)
 7 #
 8 # All tests must pass first (the "power-on unit test").
 9 
10 == code
11 
12 Entry:
13   # initialize stack
14   bd/copy-to-ebp 0/imm32
15   # Clear memory location 0 to ensure that uninitialized arrays run afoul of
16   # the bounds checker.
17   # TODO: This is utterly bonkers, and does not actually protect us against
18   # all null pointer reads/writes. Create a real page table sometime.
19   b8/copy-to-eax 0/imm32
20   c7 0/subop/copy *eax 0/imm32
21 #?   (main 0 0 Primary-bus-secondary-drive)
22   # always first run tests
23   (run-tests)
24   (num-test-failures)  # => eax
25   # call main if tests all passed
26   {
27     3d/compare-eax-and 0/imm32
28     75/jump-if-!= break/disp8
29     (clear-real-screen)
30     c7 0/subop/copy *Real-screen-cursor-x 0/imm32
31     c7 0/subop/copy *Real-screen-cursor-y 0/imm32
32     (main 0 0 Primary-bus-secondary-drive)
33   }
34 
35   # hang indefinitely
36   {
37     eb/jump loop/disp8
38   }