1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _5LEVEL_FIXUP_H
 3#define _5LEVEL_FIXUP_H
 4
 5#define __ARCH_HAS_5LEVEL_HACK
 6#define __PAGETABLE_P4D_FOLDED 1
 7
 8#define P4D_SHIFT			PGDIR_SHIFT
 9#define P4D_SIZE			PGDIR_SIZE
10#define P4D_MASK			PGDIR_MASK
11#define MAX_PTRS_PER_P4D		1
12#define PTRS_PER_P4D			1
13
14#define p4d_t				pgd_t
15
16#define pud_alloc(mm, p4d, address) \
17	((unlikely(pgd_none(*(p4d))) && __pud_alloc(mm, p4d, address)) ? \
18		NULL : pud_offset(p4d, address))
19
20#define p4d_alloc(mm, pgd, address)	(pgd)
21#define p4d_offset(pgd, start)		(pgd)
22
23#ifndef __ASSEMBLY__
24static inline int p4d_none(p4d_t p4d)
25{
26	return 0;
27}
28
29static inline int p4d_bad(p4d_t p4d)
30{
31	return 0;
32}
33
34static inline int p4d_present(p4d_t p4d)
35{
36	return 1;
37}
38#endif
39
40#define p4d_ERROR(p4d)			do { } while (0)
41#define p4d_clear(p4d)			pgd_clear(p4d)
42#define p4d_val(p4d)			pgd_val(p4d)
43#define p4d_populate(mm, p4d, pud)	pgd_populate(mm, p4d, pud)
44#define p4d_populate_safe(mm, p4d, pud)	pgd_populate(mm, p4d, pud)
45#define p4d_page(p4d)			pgd_page(p4d)
46#define p4d_page_vaddr(p4d)		pgd_page_vaddr(p4d)
47
48#define __p4d(x)			__pgd(x)
49#define set_p4d(p4dp, p4d)		set_pgd(p4dp, p4d)
50
51#undef p4d_free_tlb
52#define p4d_free_tlb(tlb, x, addr)	do { } while (0)
53#define p4d_free(mm, x)			do { } while (0)
54#define __p4d_free_tlb(tlb, x, addr)	do { } while (0)
55
56#undef  p4d_addr_end
57#define p4d_addr_end(addr, end)		(end)
58
59#endif