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 */
16typedef 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 */
28static inline int p4d_none(p4d_t p4d)		{ return 0; }
29static inline int p4d_bad(p4d_t p4d)		{ return 0; }
30static inline int p4d_present(p4d_t p4d)	{ return 1; }
31static 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
42static 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 */

 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 */