arch/powerpc/include/asm/pgtable.h

   1 #ifndef _ASM_POWERPC_PGTABLE_H
   2 #define _ASM_POWERPC_PGTABLE_H
   3
   4 #ifndef __ASSEMBLY__
   5 #include <linux/mmdebug.h>
   6 #include <linux/mmzone.h>
   7 #include <asm/processor.h>              /* For TASK_SIZE */
   8 #include <asm/mmu.h>
   9 #include <asm/page.h>
  10
  11 struct mm_struct;
  12
  13 #endif /* !__ASSEMBLY__ */
  14
  15 #ifdef CONFIG_PPC_BOOK3S
  16 #include <asm/book3s/pgtable.h>
  17 #else
  18 #include <asm/nohash/pgtable.h>
  19 #endif /* !CONFIG_PPC_BOOK3S */
  20
  21 #ifndef __ASSEMBLY__
  22
  23 #include <asm/tlbflush.h>
  24
  25 /* Keep these as a macros to avoid include dependency mess */
  26 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  27 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
  28
  29 /*
  30  * ZERO_PAGE is a global shared page that is always zero: used
  31  * for zero-mapped memory areas etc..
  32  */
  33 extern unsigned long empty_zero_page[];
  34 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  35
  36 extern pgd_t swapper_pg_dir[];
  37
  38 void limit_zone_pfn(enum zone_type zone, unsigned long max_pfn);
  39 int dma_pfn_limit_to_zone(u64 pfn_limit);
  40 extern void paging_init(void);
  41
  42 /*
  43  * kern_addr_valid is intended to indicate whether an address is a valid
  44  * kernel address.  Most 32-bit archs define it as always true (like this)
  45  * but most 64-bit archs actually perform a test.  What should we do here?
  46  */
  47 #define kern_addr_valid(addr)   (1)
  48
  49 #include <asm-generic/pgtable.h>
  50
  51
  52 /*
  53  * This gets called at the end of handling a page fault, when
  54  * the kernel has put a new PTE into the page table for the process.
  55  * We use it to ensure coherency between the i-cache and d-cache
  56  * for the page which has just been mapped in.
  57  * On machines which use an MMU hash table, we use this to put a
  58  * corresponding HPTE into the hash table ahead of time, instead of
  59  * waiting for the inevitable extra hash-table miss exception.
  60  */
  61 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *);
  62
  63 extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
  64                        unsigned long end, int write,
  65                        struct page **pages, int *nr);
  66 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
  67 #define pmd_large(pmd)          0
  68 #endif
  69 pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
  70                                    bool *is_thp, unsigned *shift);
  71 static inline pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
  72                                                bool *is_thp, unsigned *shift)
  73 {
  74         VM_WARN(!arch_irqs_disabled(),
  75                 "%s called with irq enabled\n", __func__);
  76         return __find_linux_pte_or_hugepte(pgdir, ea, is_thp, shift);
  77 }
  78
  79 unsigned long vmalloc_to_phys(void *vmalloc_addr);
  80
  81 void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
  82 void pgtable_cache_init(void);
  83 #endif /* __ASSEMBLY__ */
  84
  85 #endif /* _ASM_POWERPC_PGTABLE_H */