Line data    Source code

       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : #ifndef _PGTABLE_NOP4D_H
       3             : #define _PGTABLE_NOP4D_H
       4             : 
       5             : #ifndef __ASSEMBLY__
       6             : 
       7             : #define __PAGETABLE_P4D_FOLDED 1
       8             : 
       9             : typedef struct { pgd_t pgd; } p4d_t;
      10             : 
      11             : #define P4D_SHIFT               PGDIR_SHIFT
      12             : #define MAX_PTRS_PER_P4D        1
      13             : #define PTRS_PER_P4D            1
      14             : #define P4D_SIZE                (1UL << P4D_SHIFT)
      15             : #define P4D_MASK                (~(P4D_SIZE-1))
      16             : 
      17             : /*
      18             :  * The "pgd_xxx()" functions here are trivial for a folded two-level
      19             :  * setup: the p4d is never bad, and a p4d always exists (as it's folded
      20             :  * into the pgd entry)
      21             :  */
      22      199927 : static inline int pgd_none(pgd_t pgd)           { return 0; }
      23      193622 : static inline int pgd_bad(pgd_t pgd)            { return 0; }
      24         185 : static inline int pgd_present(pgd_t pgd)        { return 1; }
      25           0 : static inline void pgd_clear(pgd_t *pgd)        { }
      26             : #define p4d_ERROR(p4d)                          (pgd_ERROR((p4d).pgd))
      27             : 
      28             : #define pgd_populate(mm, pgd, p4d)              do { } while (0)
      29             : #define pgd_populate_safe(mm, pgd, p4d)         do { } while (0)
      30             : /*
      31             :  * (p4ds are folded into pgds so this doesn't get actually called,
      32             :  * but the define is needed for a generic inline function.)
      33             :  */
      34             : #define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval })
      35             : 
      36      411620 : static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
      37             : {
      38      383591 :         return (p4d_t *)pgd;
      39             : }
      40             : 
      41             : #define p4d_val(x)                              (pgd_val((x).pgd))
      42             : #define __p4d(x)                                ((p4d_t) { __pgd(x) })
      43             : 
      44             : #define pgd_page(pgd)                           (p4d_page((p4d_t){ pgd }))
      45             : #define pgd_page_vaddr(pgd)                     (p4d_page_vaddr((p4d_t){ pgd }))
      46             : 
      47             : /*
      48             :  * allocating and freeing a p4d is trivial: the 1-entry p4d is
      49             :  * inside the pgd, so has no extra memory associated with it.
      50             :  */
      51             : #define p4d_alloc_one(mm, address)              NULL
      52             : #define p4d_free(mm, x)                         do { } while (0)
      53             : #define p4d_free_tlb(tlb, x, a)                 do { } while (0)
      54             : 
      55             : #undef  p4d_addr_end
      56             : #define p4d_addr_end(addr, end)                 (end)
      57             : 
      58             : #endif /* __ASSEMBLY__ */
      59             : #endif /* _PGTABLE_NOP4D_H */