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

  #ifndef _PGTABLE_NOPUD_H
  #define _PGTABLE_NOPUD_H
  
  #ifndef __ASSEMBLY__

  #ifdef __ARCH_USE_5LEVEL_HACK
  #include <asm-generic/pgtable-nop4d-hack.h>
  #else

  #include <asm-generic/pgtable-nop4d.h>

  #define __PAGETABLE_PUD_FOLDED
  
  /*

   * Having the pud type consist of a p4d gets the size right, and allows
   * us to conceptually access the p4d entry that this pud is folded into

   * without casting.
   */

  typedef struct { p4d_t p4d; } pud_t;

  #define PUD_SHIFT	P4D_SHIFT

  #define PTRS_PER_PUD	1
  #define PUD_SIZE  	(1UL << PUD_SHIFT)
  #define PUD_MASK  	(~(PUD_SIZE-1))
  
  /*

   * The "p4d_xxx()" functions here are trivial for a folded two-level

   * setup: the pud is never bad, and a pud always exists (as it's folded

   * into the p4d entry)

   */

  static inline int p4d_none(p4d_t p4d)		{ return 0; }
  static inline int p4d_bad(p4d_t p4d)		{ return 0; }
  static inline int p4d_present(p4d_t p4d)	{ return 1; }
  static inline void p4d_clear(p4d_t *p4d)	{ }
  #define pud_ERROR(pud)				(p4d_ERROR((pud).p4d))

  #define p4d_populate(mm, p4d, pud)		do { } while (0)

  /*

   * (puds are folded into p4ds so this doesn't get actually called,

   * but the define is needed for a generic inline function.)
   */

  #define set_p4d(p4dptr, p4dval)	set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })

  static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)

  {

  	return (pud_t *)p4d;

  }

  #define pud_val(x)				(p4d_val((x).p4d))
  #define __pud(x)				((pud_t) { __p4d(x) })

  #define p4d_page(p4d)				(pud_page((pud_t){ p4d }))
  #define p4d_page_vaddr(p4d)			(pud_page_vaddr((pud_t){ p4d }))

  
  /*
   * allocating and freeing a pud is trivial: the 1-entry pud is

   * inside the p4d, so has no extra memory associated with it.

   */
  #define pud_alloc_one(mm, address)		NULL

  #define pud_free(mm, x)				do { } while (0)

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

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

  #endif /* !__ARCH_USE_5LEVEL_HACK */

  #endif /* _PGTABLE_NOPUD_H */