ominOS (c) 2006 Anthony Lineberry
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As of now, the kernel is 2 stages. The initial stage is a multiboot compliant
stub that GRUB loads. This first stage then enables paging and sets up all of the memory, and then loads the 2nd stage as a module into upper memory at the 
address 0xC0000000. This 2nd stage is the main kernel proper.

kernel memory layout
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0x00000000 - 0x00400000: lower 4 megs identify mapped to physical memory
0x00400001 - 0x7fffffff: unused
0x80000000 - 0xbfffafff: user space (user heap somewhere in here)
0xbfffb000 - 0xbfffbfff: user stack
0xc0000000 - 0xc0400000: kernel space
0xc0400001 - 0xcfffffff: unused
0xd0000000 - dfffffffff: kernel heap
0xe0000000 - 0xefffafff: unused
0xefffb000 - 0xefffbfff: kernel stack
0xefffc000 - 0xffbfefff: unused
0xffbff000 - 0xffefffff: kernel DMA reserved
0xfff00000 - 0xffffffff: unused