1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _PGTABLE_NOPUD_H
 3#define _PGTABLE_NOPUD_H
 4
 5#ifndef __ASSEMBLY__
 6
 7#ifdef __ARCH_USE_5LEVEL_HACK
 8#include <asm-generic/pgtable-nop4d-hack.h>
 9#else
10#include <asm-generic/pgtable-nop4d.h>
11
12#define __PAGETABLE_PUD_FOLDED 1
13
14/*
15 * Having the pud type consist of a p4d gets the size right, and allows
16 * us to conceptually access the p4d entry that this pud is folded into
17 * without casting.
18 */
19typedef struct { p4d_t p4d; } pud_t;
20
21#define PUD_SHIFT	P4D_SHIFT
22#define PTRS_PER_PUD	1
23#define PUD_SIZE  	(1UL << PUD_SHIFT)
24#define PUD_MASK  	(~(PUD_SIZE-1))
25
26/*
27 * The "p4d_xxx()" functions here are trivial for a folded two-level
28 * setup: the pud is never bad, and a pud always exists (as it's folded
29 * into the p4d entry)
30 */
31static inline int p4d_none(p4d_t p4d)		{ return 0; }
32static inline int p4d_bad(p4d_t p4d)		{ return 0; }
33static inline int p4d_present(p4d_t p4d)	{ return 1; }
34static inline void p4d_clear(p4d_t *p4d)	{ }
35#define pud_ERROR(pud)				(p4d_ERROR((pud).p4d))
36
37#define p4d_populate(mm, p4d, pud)		do { } while (0)
38#define p4d_populate_safe(mm, p4d, pud)		do { } while (0)
39/*
40 * (puds are folded into p4ds so this doesn't get actually called,
41 * but the define is needed for a generic inline function.)
42 */
43#define set_p4d(p4dptr, p4dval)	set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
44
45static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
46{
47	return (pud_t *)p4d;
48}
49
50#define pud_val(x)				(p4d_val((x).p4d))
51#define __pud(x)				((pud_t) { __p4d(x) })
52
53#define p4d_page(p4d)				(pud_page((pud_t){ p4d }))
54#define p4d_page_vaddr(p4d)			(pud_page_vaddr((pud_t){ p4d }))
55
56/*
57 * allocating and freeing a pud is trivial: the 1-entry pud is
58 * inside the p4d, so has no extra memory associated with it.
59 */
60#define pud_alloc_one(mm, address)		NULL
61#define pud_free(mm, x)				do { } while (0)
62#define __pud_free_tlb(tlb, x, a)		do { } while (0)
63
64#undef  pud_addr_end
65#define pud_addr_end(addr, end)			(end)
66
67#endif /* __ASSEMBLY__ */
68#endif /* !__ARCH_USE_5LEVEL_HACK */
69#endif /* _PGTABLE_NOPUD_H */

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