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# The simplest possible program: just an infinite loop.
# All is well if your computer clears screen and hangs without restarting.
# On an emulator the window may get bigger to accomodate the higher-resolution
# graphics mode.
#
# To convert to a disk image, first prepare a realistically sized disk image:
#   dd if=/dev/zero of=disk.img count=20160  # 512-byte sectors, so 10MB
# Load the program on the disk image:
#   cat baremetal/boot.hex baremetal/ex1.hex  |bootstrap/bootstrap run hex  > a.bin
#   dd if=a.bin of=disk.img conv=notrunc
# To run:
#   qemu-system-i386 disk.img
# Or:
#   bochs -f baremetal/boot.bochsrc  # boot.bochsrc loads disk.img

# main:  (address 0x9400)
e9 fb ff ff ff  # jump to main, hanging indefinitely

# vim:ft=subx

re># print msg to screen if a != b, otherwise print "."
fn check-ints-equal _a: int, b: int, msg: (addr array byte) {
  var a/eax: int <- copy _a
  compare a, b
  {
    break-if-!=
    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, ".", 3/fg/cyan, 0/bg
    return
  }
  draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, msg, 3/fg/cyan, 0/bg
  move-cursor-to-start-of-next-line 0/screen
  count-test-failure
}

fn test-check-ints-equal {
  check-ints-equal 0, 0, "abc"
}

fn check _a: boolean, msg: (addr array byte) {
  var a/eax: int <- copy _a
  compare a, 0/false
  {
    break-if-=
    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, ".", 3/fg/cyan, 0/bg
    return
  }
  draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, msg, 3/fg/cyan, 0/bg
  move-cursor-to-start-of-next-line 0/screen
  count-test-failure
}

fn check-not _a: boolean, msg: (addr array byte) {
  var a/eax: int <- copy _a
  compare a, 0/false
  {
    break-if-!=
    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, ".", 3/fg/cyan, 0/bg
    return
  }
  draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, msg, 3/fg/cyan, 0/bg
  move-cursor-to-start-of-next-line 0/screen
  count-test-failure
}