Legacy

+------------+  multiboot
|    GRUB    |-------------+
+------------+             |
      OR                   v
+------------+       +-------------+       +--------------+
| bootsector |------>| stpdldr.sys |------>| vmstupid.sys |
+------------+       +-------------+       +--------------+
Summary
Memory Map

Memory Map

0x100000 +-----------------------+
         |                       |
         | Reserved              |
         |                       |
0x080000 +-----------------------+
         |                       |
         | Kernel preload        |
         |                       |
0x00F000 +-----------------------+
         |                       |
         | buffer                |
         |                       |
0x008000 +-----------------------+
         |                       |
         | bootsector            |
         |                       |
0x007000 +-----------------------+
         |                       |
         | Real mode stack       |
         |                       |
0x006000 +-----------------------+
         |                       |
         | stpdldr.sys           |
         |                       |
0x001000 +-----------------------+
         |                       |
         | Reserved (BIOS & IVT) |
         |                       |
0x000000 +-----------------------+

UEFI (IA32)

+--------------+      +--------------+
| BOOTIA32.EFI |----->| vmstupid.sys |
+--------------+      +--------------+
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