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Linux/include/asm-generic/pgtable-nop4d-hack.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _PGTABLE_NOP4D_HACK_H
  3 #define _PGTABLE_NOP4D_HACK_H
  4 
  5 #ifndef __ASSEMBLY__
  6 #include <asm-generic/5level-fixup.h>
  7 
  8 #define __PAGETABLE_PUD_FOLDED
  9 
 10 /*
 11  * Having the pud type consist of a pgd gets the size right, and allows
 12  * us to conceptually access the pgd entry that this pud is folded into
 13  * without casting.
 14  */
 15 typedef struct { pgd_t pgd; } pud_t;
 16 
 17 #define PUD_SHIFT       PGDIR_SHIFT
 18 #define PTRS_PER_PUD    1
 19 #define PUD_SIZE        (1UL << PUD_SHIFT)
 20 #define PUD_MASK        (~(PUD_SIZE-1))
 21 
 22 /*
 23  * The "pgd_xxx()" functions here are trivial for a folded two-level
 24  * setup: the pud is never bad, and a pud always exists (as it's folded
 25  * into the pgd entry)
 26  */
 27 static inline int pgd_none(pgd_t pgd)           { return 0; }
 28 static inline int pgd_bad(pgd_t pgd)            { return 0; }
 29 static inline int pgd_present(pgd_t pgd)        { return 1; }
 30 static inline void pgd_clear(pgd_t *pgd)        { }
 31 #define pud_ERROR(pud)                          (pgd_ERROR((pud).pgd))
 32 
 33 #define pgd_populate(mm, pgd, pud)              do { } while (0)
 34 /*
 35  * (puds are folded into pgds so this doesn't get actually called,
 36  * but the define is needed for a generic inline function.)
 37  */
 38 #define set_pgd(pgdptr, pgdval) set_pud((pud_t *)(pgdptr), (pud_t) { pgdval })
 39 
 40 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
 41 {
 42         return (pud_t *)pgd;
 43 }
 44 
 45 #define pud_val(x)                              (pgd_val((x).pgd))
 46 #define __pud(x)                                ((pud_t) { __pgd(x) })
 47 
 48 #define pgd_page(pgd)                           (pud_page((pud_t){ pgd }))
 49 #define pgd_page_vaddr(pgd)                     (pud_page_vaddr((pud_t){ pgd }))
 50 
 51 /*
 52  * allocating and freeing a pud is trivial: the 1-entry pud is
 53  * inside the pgd, so has no extra memory associated with it.
 54  */
 55 #define pud_alloc_one(mm, address)              NULL
 56 #define pud_free(mm, x)                         do { } while (0)
 57 #define __pud_free_tlb(tlb, x, a)               do { } while (0)
 58 
 59 #undef  pud_addr_end
 60 #define pud_addr_end(addr, end)                 (end)
 61 
 62 #endif /* __ASSEMBLY__ */
 63 #endif /* _PGTABLE_NOP4D_HACK_H */
 64 

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