splitting of address space

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Dear all,

I was reading the LDD3's DMA chapter (chapter 15). The author talks
about the splitting of address space between 1GB and 3GB. I couldn't
make myself crystal clear as to why it is done.  I got even more
confused when he said kernel can't access physicalmemory address which
is not mapped into kernel space. Why doesn't kernel has full access to
all the address space?

Thanks

Regards
--Himanshu


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