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>
   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 /*
  21  * Macro to mark a page protection value as "uncacheable".
  22  */
  23
  24 #define _PAGE_CACHE_CTL (_PAGE_COHERENT | _PAGE_GUARDED | _PAGE_NO_CACHE | \
  25                          _PAGE_WRITETHRU)
  26
  27 #define pgprot_noncached(prot)    (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
  28                                             _PAGE_NO_CACHE | _PAGE_GUARDED))
  29
  30 #define pgprot_noncached_wc(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
  31                                             _PAGE_NO_CACHE))
  32
  33 #define pgprot_cached(prot)       (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
  34                                             _PAGE_COHERENT))
  35
  36 #define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \
  37                                             _PAGE_COHERENT | _PAGE_WRITETHRU))
  38
  39
  40 struct file;
  41 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
  42                                      unsigned long size, pgprot_t vma_prot);
  43 #define __HAVE_PHYS_MEM_ACCESS_PROT
  44
  45 /*
  46  * ZERO_PAGE is a global shared page that is always zero: used
  47  * for zero-mapped memory areas etc..
  48  */
  49 extern unsigned long empty_zero_page[];
  50 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  51
  52 extern pgd_t swapper_pg_dir[];
  53
  54 extern void paging_init(void);
  55
  56 /*
  57  * kern_addr_valid is intended to indicate whether an address is a valid
  58  * kernel address.  Most 32-bit archs define it as always true (like this)
  59  * but most 64-bit archs actually perform a test.  What should we do here?
  60  */
  61 #define kern_addr_valid(addr)   (1)
  62
  63 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
  64                 remap_pfn_range(vma, vaddr, pfn, size, prot)
  65
  66 #include <asm-generic/pgtable.h>
  67
  68
  69 /*
  70  * This gets called at the end of handling a page fault, when
  71  * the kernel has put a new PTE into the page table for the process.
  72  * We use it to ensure coherency between the i-cache and d-cache
  73  * for the page which has just been mapped in.
  74  * On machines which use an MMU hash table, we use this to put a
  75  * corresponding HPTE into the hash table ahead of time, instead of
  76  * waiting for the inevitable extra hash-table miss exception.
  77  */
  78 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
  79
  80 #endif /* __ASSEMBLY__ */
  81
  82 #endif /* __KERNEL__ */
  83 #endif /* _ASM_POWERPC_PGTABLE_H */