1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PGTABLE_NOPUD_H
3 #define _PGTABLE_NOPUD_H
4
5 #ifndef __ASSEMBLY__
6
7 #include <asm-generic/pgtable-nop4d.h>
8
9 #define __PAGETABLE_PUD_FOLDED 1
10
11 /*
12 * Having the pud type consist of a p4d gets the size right, and allows
13 * us to conceptually access the p4d entry that this pud is folded into
14 * without casting.
15 */
16 typedef struct { p4d_t p4d; } pud_t;
17
18 #define PUD_SHIFT P4D_SHIFT
19 #define PTRS_PER_PUD 1
20 #define PUD_SIZE (1UL << PUD_SHIFT)
21 #define PUD_MASK (~(PUD_SIZE-1))
22
23 /*
24 * The "p4d_xxx()" functions here are trivial for a folded two-level
25 * setup: the pud is never bad, and a pud always exists (as it's folded
26 * into the p4d entry)
27 */
28 static inline int p4d_none(p4d_t p4d) { return 0; }
29 static inline int p4d_bad(p4d_t p4d) { return 0; }
30 static inline int p4d_present(p4d_t p4d) { return 1; }
31 static inline void p4d_clear(p4d_t *p4d) { }
32 #define pud_ERROR(pud) (p4d_ERROR((pud).p4d))
33
34 #define p4d_populate(mm, p4d, pud) do { } while (0)
35 #define p4d_populate_safe(mm, p4d, pud) do { } while (0)
36 /*
37 * (puds are folded into p4ds so this doesn't get actually called,
38 * but the define is needed for a generic inline function.)
39 */
40 #define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
41
42 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
43 {
44 return (pud_t *)p4d;
45 }
46 #define pud_offset pud_offset
47
48 #define pud_val(x) (p4d_val((x).p4d))
49 #define __pud(x) ((pud_t) { __p4d(x) })
50
51 #define p4d_page(p4d) (pud_page((pud_t){ p4d }))
52 #define p4d_pgtable(p4d) ((pud_t *)(pud_pgtable((pud_t){ p4d })))
53
54 /*
55 * allocating and freeing a pud is trivial: the 1-entry pud is
56 * inside the p4d, so has no extra memory associated with it.
57 */
58 #define pud_alloc_one(mm, address) NULL
59 #define pud_free(mm, x) do { } while (0)
60 #define pud_free_tlb(tlb, x, a) do { } while (0)
61
62 #undef pud_addr_end
63 #define pud_addr_end(addr, end) (end)
64
65 #endif /* __ASSEMBLY__ */
66 #endif /* _PGTABLE_NOPUD_H */
67
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