include/asm-powerpc/pgtable.h

   1 #ifndef _ASM_POWERPC_PGTABLE_H
   2 #define _ASM_POWERPC_PGTABLE_H
   3 #ifdef __KERNEL__
   4
   5 #ifndef __ASSEMBLY__
   6 #include <asm/processor.h>              /* For TASK_SIZE */
   7 #include <asm/mmu.h>
   8 #include <asm/page.h>
   9 struct mm_struct;
  10 #endif /* !__ASSEMBLY__ */
  11
  12 #if defined(CONFIG_PPC64)
  13 #  include <asm/pgtable-ppc64.h>
  14 #else
  15 #  include <asm/pgtable-ppc32.h>
  16 #endif
  17
  18 #ifndef __ASSEMBLY__
  19 /*
  20  * ZERO_PAGE is a global shared page that is always zero: used
  21  * for zero-mapped memory areas etc..
  22  */
  23 extern unsigned long empty_zero_page[];
  24 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  25
  26 extern pgd_t swapper_pg_dir[];
  27
  28 extern void paging_init(void);
  29
  30 /*
  31  * kern_addr_valid is intended to indicate whether an address is a valid
  32  * kernel address.  Most 32-bit archs define it as always true (like this)
  33  * but most 64-bit archs actually perform a test.  What should we do here?
  34  */
  35 #define kern_addr_valid(addr)   (1)
  36
  37 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
  38                 remap_pfn_range(vma, vaddr, pfn, size, prot)
  39
  40 #include <asm-generic/pgtable.h>
  41
  42
  43 /*
  44  * This gets called at the end of handling a page fault, when
  45  * the kernel has put a new PTE into the page table for the process.
  46  * We use it to ensure coherency between the i-cache and d-cache
  47  * for the page which has just been mapped in.
  48  * On machines which use an MMU hash table, we use this to put a
  49  * corresponding HPTE into the hash table ahead of time, instead of
  50  * waiting for the inevitable extra hash-table miss exception.
  51  */
  52 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
  53
  54 #endif /* __ASSEMBLY__ */
  55
  56 #endif /* __KERNEL__ */
  57 #endif /* _ASM_POWERPC_PGTABLE_H */