LXR linux/include/asm-generic/pgtable-nopud.h

   1#ifndef _PGTABLE_NOPUD_H
   2#define _PGTABLE_NOPUD_H
   3
   4#ifndef __ASSEMBLY__
   5
   6#ifdef __ARCH_USE_5LEVEL_HACK
   7#include <asm-generic/pgtable-nop4d-hack.h>
   8#else
   9#include <asm-generic/pgtable-nop4d.h>
  10
  11#define __PAGETABLE_PUD_FOLDED
  12
  13/*
  14 * Having the pud type consist of a p4d gets the size right, and allows
  15 * us to conceptually access the p4d entry that this pud is folded into
  16 * without casting.
  17 */
  18typedef struct { p4d_t p4d; } pud_t;
  19
  20#define PUD_SHIFT       P4D_SHIFT
  21#define PTRS_PER_PUD    1
  22#define PUD_SIZE        (1UL << PUD_SHIFT)
  23#define PUD_MASK        (~(PUD_SIZE-1))
  24
  25/*
  26 * The "p4d_xxx()" functions here are trivial for a folded two-level
  27 * setup: the pud is never bad, and a pud always exists (as it's folded
  28 * into the p4d entry)
  29 */
  30static inline int p4d_none(p4d_t p4d)           { return 0; }
  31static inline int p4d_bad(p4d_t p4d)            { return 0; }
  32static inline int p4d_present(p4d_t p4d)        { return 1; }
  33static inline void p4d_clear(p4d_t *p4d)        { }
  34#define pud_ERROR(pud)                          (p4d_ERROR((pud).p4d))
  35
  36#define p4d_populate(mm, p4d, pud)              do { } while (0)
  37/*
  38 * (puds are folded into p4ds so this doesn't get actually called,
  39 * but the define is needed for a generic inline function.)
  40 */
  41#define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
  42
  43static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
  44{
  45        return (pud_t *)p4d;
  46}
  47
  48#define pud_val(x)                              (p4d_val((x).p4d))
  49#define __pud(x)                                ((pud_t) { __p4d(x) })
  50
  51#define p4d_page(p4d)                           (pud_page((pud_t){ p4d }))
  52#define p4d_page_vaddr(p4d)                     (pud_page_vaddr((pud_t){ p4d }))
  53
  54/*
  55 * allocating and freeing a pud is trivial: the 1-entry pud is
  56 * inside the p4d, so has no extra memory associated with it.
  57 */
  58#define pud_alloc_one(mm, address)              NULL
  59#define pud_free(mm, x)                         do { } while (0)
  60#define __pud_free_tlb(tlb, x, a)               do { } while (0)
  61
  62#undef  pud_addr_end
  63#define pud_addr_end(addr, end)                 (end)
  64
  65#endif /* __ASSEMBLY__ */
  66#endif /* !__ARCH_USE_5LEVEL_HACK */
  67#endif /* _PGTABLE_NOPUD_H */
  68