LXR linux/arch/sh/include/asm/pgtable-3level.h

   1#ifndef __ASM_SH_PGTABLE_3LEVEL_H
   2#define __ASM_SH_PGTABLE_3LEVEL_H
   3
   4#include <asm-generic/pgtable-nopud.h>
   5
   6/*
   7 * Some cores need a 3-level page table layout, for example when using
   8 * 64-bit PTEs and 4K pages.
   9 */
  10#define PAGETABLE_LEVELS        3
  11
  12#define PTE_MAGNITUDE           3       /* 64-bit PTEs on SH-X2 TLB */
  13
  14/* PGD bits */
  15#define PGDIR_SHIFT             30
  16
  17#define PTRS_PER_PGD            4
  18#define USER_PTRS_PER_PGD       2
  19
  20/* PMD bits */
  21#define PMD_SHIFT       (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
  22#define PMD_SIZE        (1UL << PMD_SHIFT)
  23#define PMD_MASK        (~(PMD_SIZE-1))
  24
  25#define PTRS_PER_PMD    ((1 << PGDIR_SHIFT) / PMD_SIZE)
  26
  27#define pmd_ERROR(e) \
  28        printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
  29
  30typedef struct { unsigned long long pmd; } pmd_t;
  31#define pmd_val(x)      ((x).pmd)
  32#define __pmd(x)        ((pmd_t) { (x) } )
  33
  34static inline unsigned long pud_page_vaddr(pud_t pud)
  35{
  36        return pud_val(pud);
  37}
  38
  39#define pmd_index(address)      (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
  40static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
  41{
  42        return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
  43}
  44
  45#define pud_none(x)     (!pud_val(x))
  46#define pud_present(x)  (pud_val(x))
  47#define pud_clear(xp)   do { set_pud(xp, __pud(0)); } while (0)
  48#define pud_bad(x)      (pud_val(x) & ~PAGE_MASK)
  49
  50/*
  51 * (puds are folded into pgds so this doesn't get actually called,
  52 * but the define is needed for a generic inline function.)
  53 */
  54#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
  55
  56#endif /* __ASM_SH_PGTABLE_3LEVEL_H */
  57