1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _PGTABLE_NOPMD_H
 3#define _PGTABLE_NOPMD_H
 4
 5#ifndef __ASSEMBLY__
 6
 7#include <asm-generic/pgtable-nopud.h>
 8
 9struct mm_struct;
10
11#define __PAGETABLE_PMD_FOLDED 1
12
13/*
14 * Having the pmd type consist of a pud gets the size right, and allows
15 * us to conceptually access the pud entry that this pmd is folded into
16 * without casting.
17 */
18typedef struct { pud_t pud; } pmd_t;
19
20#define PMD_SHIFT	PUD_SHIFT
21#define PTRS_PER_PMD	1
22#define PMD_SIZE  	(1UL << PMD_SHIFT)
23#define PMD_MASK  	(~(PMD_SIZE-1))
24
25/*
26 * The "pud_xxx()" functions here are trivial for a folded two-level
27 * setup: the pmd is never bad, and a pmd always exists (as it's folded
28 * into the pud entry)
29 */
30static inline int pud_none(pud_t pud)		{ return 0; }
31static inline int pud_bad(pud_t pud)		{ return 0; }
32static inline int pud_present(pud_t pud)	{ return 1; }
33static inline int pud_user(pud_t pud)		{ return 0; }
34static inline int pud_leaf(pud_t pud)		{ return 0; }
35static inline void pud_clear(pud_t *pud)	{ }
36#define pmd_ERROR(pmd)				(pud_ERROR((pmd).pud))
37
38#define pud_populate(mm, pmd, pte)		do { } while (0)
39
40/*
41 * (pmds are folded into puds so this doesn't get actually called,
42 * but the define is needed for a generic inline function.)
43 */
44#define set_pud(pudptr, pudval)			set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
45
46static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
47{
48	return (pmd_t *)pud;
49}
50#define pmd_offset pmd_offset
51
52#define pmd_val(x)				(pud_val((x).pud))
53#define __pmd(x)				((pmd_t) { __pud(x) } )
54
55#define pud_page(pud)				(pmd_page((pmd_t){ pud }))
56#define pud_pgtable(pud)			((pmd_t *)(pmd_page_vaddr((pmd_t){ pud })))
57
58/*
59 * allocating and freeing a pmd is trivial: the 1-entry pmd is
60 * inside the pud, so has no extra memory associated with it.
61 */
62#define pmd_alloc_one(mm, address)		NULL
63static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
64{
65}
66#define pmd_free_tlb(tlb, x, a)		do { } while (0)
67
68#undef  pmd_addr_end
69#define pmd_addr_end(addr, end)			(end)
70
71#endif /* __ASSEMBLY__ */
72
73#endif /* _PGTABLE_NOPMD_H */

 1#ifndef _PGTABLE_NOPMD_H
 2#define _PGTABLE_NOPMD_H
 3
 4#ifndef __ASSEMBLY__
 5
 6#include <asm-generic/pgtable-nopud.h>
 7
 8struct mm_struct;
 9
10#define __PAGETABLE_PMD_FOLDED
11
12/*
13 * Having the pmd type consist of a pud gets the size right, and allows
14 * us to conceptually access the pud entry that this pmd is folded into
15 * without casting.
16 */
17typedef struct { pud_t pud; } pmd_t;
18
19#define PMD_SHIFT	PUD_SHIFT
20#define PTRS_PER_PMD	1
21#define PMD_SIZE  	(1UL << PMD_SHIFT)
22#define PMD_MASK  	(~(PMD_SIZE-1))
23
24/*
25 * The "pud_xxx()" functions here are trivial for a folded two-level
26 * setup: the pmd is never bad, and a pmd always exists (as it's folded
27 * into the pud entry)
28 */
29static inline int pud_none(pud_t pud)		{ return 0; }
30static inline int pud_bad(pud_t pud)		{ return 0; }
31static inline int pud_present(pud_t pud)	{ return 1; }
32static inline void pud_clear(pud_t *pud)	{ }
33#define pmd_ERROR(pmd)				(pud_ERROR((pmd).pud))
34
35#define pud_populate(mm, pmd, pte)		do { } while (0)
36
37/*
38 * (pmds are folded into puds so this doesn't get actually called,
39 * but the define is needed for a generic inline function.)
40 */
41#define set_pud(pudptr, pudval)			set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
42
43static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
44{
45	return (pmd_t *)pud;
46}
47
48#define pmd_val(x)				(pud_val((x).pud))
49#define __pmd(x)				((pmd_t) { __pud(x) } )
50
51#define pud_page(pud)				(pmd_page((pmd_t){ pud }))
52#define pud_page_vaddr(pud)			(pmd_page_vaddr((pmd_t){ pud }))
53
54/*
55 * allocating and freeing a pmd is trivial: the 1-entry pmd is
56 * inside the pud, so has no extra memory associated with it.
57 */
58#define pmd_alloc_one(mm, address)		NULL
59static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
60{
61}
62#define __pmd_free_tlb(tlb, x, a)		do { } while (0)
63
64#undef  pmd_addr_end
65#define pmd_addr_end(addr, end)			(end)
66
67#endif /* __ASSEMBLY__ */
68
69#endif /* _PGTABLE_NOPMD_H */