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