7469 - first working baremetal Mu program

It doesn't _quite_ do what it should, so this is more precisely the first
_buggy_ baremetal Mu program. But the tooling works, at least.

1 files changed, 31 insertions, 0 deletions

diff --git a/baremetal/ex2.mu b/baremetal/ex2.mu
new file mode 100644
index 00000000..091cb1d0
--- /dev/null
+++ b/baremetal/ex2.mu
@@ -0,0 +1,31 @@
+# Test out the video mode by filling in the screen with pixels.
+#
+# To build a disk image:
+#   ./translate_subx_baremetal baremetal/ex2.subx    # emits disk.img
+# To run:
+#   qemu-system-i386 disk.img
+# Or:
+#   bochs -f baremetal/boot.bochsrc  # boot.bochsrc loads disk.img
+#
+# Expected output:
+#   html/baremetal.png
+
+fn main {
+  var y/eax: int <- copy 0
+  {
+    compare y, 0x300  # 768
+    break-if->=
+    var color/ecx: int <- copy y
+    color <- and 0xff
+    var x/edx: int <- copy 0
+    {
+      compare x, 0x400  # 1024
+      break-if->=
+      pixel 0, x, y, color
+      x <- increment
+      loop
+    }
+    y <- increment
+    loop
+  }
+}