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Next steps: * [GDB] Add sample GDB session to wiki and explain commands * [e820] Try inverting the hidden regions list to an "allowed" regions list. Do e820 mangling as the intersection between e820 regions and the "allowed" regions. * [DMA] DMA pool API so drivers can reserve DMA buffers on ''open()''. * [b44] Cleanup, testing, performance. * [shutdown] Remove gPXE allocated memory and free up PXE+UNDI, if necessary. * [bzImage] Expand the heap size to the full 64K segment when loading a bzImage kernel with version 2.02 or higher. * [GDB] Real-mode remote debugging.