LXR linux/arch/powerpc/include/asm/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>
   9struct 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 */
  23extern unsigned long empty_zero_page[];
  24#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  25
  26extern pgd_t swapper_pg_dir[];
  27
  28extern 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 */
  52extern 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 */
  58