(4/4) discontigmem support for i386 against 2.5.30

This patch provides generic discontiguous memory support for the i386
numa architecture.  The patch also provides supports for the ia32 IBM
NUMA-Q hardware platform.  John Stultz is working on adding support for 
the x440 hardware for the 2.5 tree.

This patch depends on the three patches that I just sent out (modularization 
of setup_arch(), modularization of mem_init(), and paddr -> pfn patches).

Assumptions made: 

        - that the first node has at least 900Mb of memory

Testing done: 

        - single proc desktop pc (CONFIG_X86_NUMAQ is not set)
        - 4 proc SMP system (CONFIG_X86_NUMAQ is not set)
        - 4 proc SMP system (CONFIG_X86_NUMAQ is not set, CONFIG_HIGHMEM=64GB)
        - 16 proc NUMA box with 4GB memory (CONFIG_X86_NUMAQ=y, 
		CONFIG_NUMA is not set)
        - 16 proc NUMA box with 4GB memory (CONFIG_X86_NUMAQ=y, 
		CONFIG_NUMA is not set, CONFIG_HIGHMEM=64GB)
        - 16 proc NUMA box with 4GB memory (CONFIG_X86_NUMAQ=y, 
		CONFIG_NUMA=y)
        - 16 proc NUMA box with 4GB memory (CONFIG_X86_NUMAQ=y, 
		CONFIG_NUMA=y, CONFIG_HIGHMEM=64GB)
        - 8 proc NUMA box with 8GB memeory (CONFIG_X86_NUMAQ=y, 
		CONFIG_NUMA=y, CONFIG_HIGHMEM=64GB)
	- 16 proc NUMA box with 16GB memory (CONFIG_X86_NUMAQ=y, 
		CONFIG_NUMA=y, CONFIG_HIGHMEM=64GB)

Any and all feedback regarding this patch is greatly appreciated.

Thanks,
Pat

-- 
Patricia Gaughen (gone@us.ibm.com)
IBM Linux Technology Center
http://www.ibm.com/linux/ltc/