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0x0000.4000 - 0x0000.4007 (8): bootloader info
0x0 byte: support flags
0x80: PCI
0x40: PAE
0x1 byte: PCI "hardware characteristics"
0x2 byte: PCI minor
0x3 byte: PCI major
0x4 byte: last PCI bus
0x6 word: BIOS memory map length
0x0000.4f98 - 0x0000.4fff (104): TSS
0x0000.5000 - 0x0000.5fff (4k): kernel page directory
0x0001.0000 - 0x0001.ffff (64k): BIOS memory map
0x0003.0000 - 0x0003.7fff (32k): kernel text, data, rodata
0x0003.8000 - 0x0003.ffff (32k): kernel stack
0x0004.0000 - 0x0005.ffff (128k): pagemap
0x0006.0000 - 0x0007.ffff (128k): shared kernel page tables
0x000a.0000 - 0x000f.ffff (384k): VGA and BIOS memory
0x0040.0000 - 0x007f.ffff (4M): kernel page tables
0x00f0.0000 - 0x00ff.ffff (1M): ISA memory
0x0400.0000 - 0x07ff.ffff (64M): kernel heap, bss pages
0x0800.0000 - 0xffff.ffff (rest): user pages, hardware memory
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