pgtable-nopud.h 1.9 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. #ifndef _PGTABLE_NOPUD_H
  3. #define _PGTABLE_NOPUD_H
  4. #ifndef __ASSEMBLY__
  5. #include <asm-generic/pgtable-nop4d.h>
  6. #define __PAGETABLE_PUD_FOLDED 1
  7. /*
  8. * Having the pud type consist of a p4d gets the size right, and allows
  9. * us to conceptually access the p4d entry that this pud is folded into
  10. * without casting.
  11. */
  12. typedef struct { p4d_t p4d; } pud_t;
  13. #define PUD_SHIFT P4D_SHIFT
  14. #define PTRS_PER_PUD 1
  15. #define PUD_SIZE (1UL << PUD_SHIFT)
  16. #define PUD_MASK (~(PUD_SIZE-1))
  17. /*
  18. * The "p4d_xxx()" functions here are trivial for a folded two-level
  19. * setup: the pud is never bad, and a pud always exists (as it's folded
  20. * into the p4d entry)
  21. */
  22. static inline int p4d_none(p4d_t p4d) { return 0; }
  23. static inline int p4d_bad(p4d_t p4d) { return 0; }
  24. static inline int p4d_present(p4d_t p4d) { return 1; }
  25. static inline void p4d_clear(p4d_t *p4d) { }
  26. #define pud_ERROR(pud) (p4d_ERROR((pud).p4d))
  27. #define p4d_populate(mm, p4d, pud) do { } while (0)
  28. #define p4d_populate_safe(mm, p4d, pud) do { } while (0)
  29. /*
  30. * (puds are folded into p4ds so this doesn't get actually called,
  31. * but the define is needed for a generic inline function.)
  32. */
  33. #define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
  34. static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
  35. {
  36. return (pud_t *)p4d;
  37. }
  38. #define pud_offset pud_offset
  39. #define pud_val(x) (p4d_val((x).p4d))
  40. #define __pud(x) ((pud_t) { __p4d(x) })
  41. #define p4d_page(p4d) (pud_page((pud_t){ p4d }))
  42. #define p4d_page_vaddr(p4d) (pud_page_vaddr((pud_t){ p4d }))
  43. /*
  44. * allocating and freeing a pud is trivial: the 1-entry pud is
  45. * inside the p4d, so has no extra memory associated with it.
  46. */
  47. #define pud_alloc_one(mm, address) NULL
  48. #define pud_free(mm, x) do { } while (0)
  49. #define pud_free_tlb(tlb, x, a) do { } while (0)
  50. #undef pud_addr_end
  51. #define pud_addr_end(addr, end) (end)
  52. #endif /* __ASSEMBLY__ */
  53. #endif /* _PGTABLE_NOPUD_H */