This adds support for selecting page size on PPC 44x. However there are still number of problems: 1. We can't use default PKMAP_BASE definition with 64KB/256KB pages so we change it. Not sure that it's optimal. Then redefined PKMAP_BASE is not aligned on (1<<PMD_SHIFT), don't know if it is really bad. 2. with 16KB/64KB/256KB pages WARN_ON(!pmd_none(*pmd)) is triggered inside dma_alloc_init() function. Not sure if it is really bad. 3. with 256KB pages ENTRIES_PER_PAGEPAGE in mm/shem.c become zero. Second patch tries to address this issue. 4. Ugly ppc_page_asm.h file. I'd prefer to see these defines calculated instead of being hardcoded but PTE_SHIFT and PMD_SHIFT are declared inside #ifndef __ASSEMBLY__. Don't know why.
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