powerpc: Change BAT code to use phys_addr_t

Currently, the physical address is an unsigned long, but it should
be phys_addr_t in set_bat, [v/p]_mapped_by_bat.  Also, create a
macro that can convert a large physical address into the correct
format for programming the BAT registers.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/mmu_decl.h

@@ -29,7 +29,7 @@ extern void hash_preload(struct mm_struct *mm, unsigned long ea,
 #ifdef CONFIG_PPC32
 extern void mapin_ram(void);
 extern int map_page(unsigned long va, phys_addr_t pa, int flags);
-extern void setbat(int index, unsigned long virt, unsigned long phys,
+extern void setbat(int index, unsigned long virt, phys_addr_t phys,
 		   unsigned int size, int flags);
 extern void settlbcam(int index, unsigned long virt, phys_addr_t phys,
 		      unsigned int size, int flags, unsigned int pid);