/* SPDX-License-Identifier: GPL-2.0 */

  #ifndef _PGTABLE_NOPMD_H
  #define _PGTABLE_NOPMD_H
  
  #ifndef __ASSEMBLY__
  
  #include <asm-generic/pgtable-nopud.h>

  struct mm_struct;

  #define __PAGETABLE_PMD_FOLDED 1

  
  /*
   * Having the pmd type consist of a pud gets the size right, and allows
   * us to conceptually access the pud entry that this pmd is folded into
   * without casting.
   */
  typedef struct { pud_t pud; } pmd_t;
  
  #define PMD_SHIFT	PUD_SHIFT
  #define PTRS_PER_PMD	1
  #define PMD_SIZE  	(1UL << PMD_SHIFT)
  #define PMD_MASK  	(~(PMD_SIZE-1))
  
  /*
   * The "pud_xxx()" functions here are trivial for a folded two-level
   * setup: the pmd is never bad, and a pmd always exists (as it's folded
   * into the pud entry)
   */
  static inline int pud_none(pud_t pud)		{ return 0; }
  static inline int pud_bad(pud_t pud)		{ return 0; }
  static inline int pud_present(pud_t pud)	{ return 1; }
  static inline void pud_clear(pud_t *pud)	{ }
  #define pmd_ERROR(pmd)				(pud_ERROR((pmd).pud))
  
  #define pud_populate(mm, pmd, pte)		do { } while (0)
  
  /*
   * (pmds are folded into puds so this doesn't get actually called,
   * but the define is needed for a generic inline function.)
   */
  #define set_pud(pudptr, pudval)			set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
  
  static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
  {
  	return (pmd_t *)pud;
  }
  
  #define pmd_val(x)				(pud_val((x).pud))
  #define __pmd(x)				((pmd_t) { __pud(x) } )
  
  #define pud_page(pud)				(pmd_page((pmd_t){ pud }))

  #define pud_page_vaddr(pud)			(pmd_page_vaddr((pmd_t){ pud }))

  
  /*
   * allocating and freeing a pmd is trivial: the 1-entry pmd is
   * inside the pud, so has no extra memory associated with it.
   */
  #define pmd_alloc_one(mm, address)		NULL

  static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  {
  }

  #define __pmd_free_tlb(tlb, x, a)		do { } while (0)

  
  #undef  pmd_addr_end
  #define pmd_addr_end(addr, end)			(end)
  
  #endif /* __ASSEMBLY__ */
  
  #endif /* _PGTABLE_NOPMD_H */