1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _PGTABLE_NOP4D_H
3*4882a593Smuzhiyun #define _PGTABLE_NOP4D_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #ifndef __ASSEMBLY__
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #define __PAGETABLE_P4D_FOLDED 1
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun typedef struct { pgd_t pgd; } p4d_t;
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #define P4D_SHIFT PGDIR_SHIFT
12*4882a593Smuzhiyun #define MAX_PTRS_PER_P4D 1
13*4882a593Smuzhiyun #define PTRS_PER_P4D 1
14*4882a593Smuzhiyun #define P4D_SIZE (1UL << P4D_SHIFT)
15*4882a593Smuzhiyun #define P4D_MASK (~(P4D_SIZE-1))
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /*
18*4882a593Smuzhiyun * The "pgd_xxx()" functions here are trivial for a folded two-level
19*4882a593Smuzhiyun * setup: the p4d is never bad, and a p4d always exists (as it's folded
20*4882a593Smuzhiyun * into the pgd entry)
21*4882a593Smuzhiyun */
pgd_none(pgd_t pgd)22*4882a593Smuzhiyun static inline int pgd_none(pgd_t pgd) { return 0; }
pgd_bad(pgd_t pgd)23*4882a593Smuzhiyun static inline int pgd_bad(pgd_t pgd) { return 0; }
pgd_present(pgd_t pgd)24*4882a593Smuzhiyun static inline int pgd_present(pgd_t pgd) { return 1; }
pgd_clear(pgd_t * pgd)25*4882a593Smuzhiyun static inline void pgd_clear(pgd_t *pgd) { }
26*4882a593Smuzhiyun #define p4d_ERROR(p4d) (pgd_ERROR((p4d).pgd))
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun #define pgd_populate(mm, pgd, p4d) do { } while (0)
29*4882a593Smuzhiyun #define pgd_populate_safe(mm, pgd, p4d) do { } while (0)
30*4882a593Smuzhiyun /*
31*4882a593Smuzhiyun * (p4ds are folded into pgds so this doesn't get actually called,
32*4882a593Smuzhiyun * but the define is needed for a generic inline function.)
33*4882a593Smuzhiyun */
34*4882a593Smuzhiyun #define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval })
35*4882a593Smuzhiyun
p4d_offset(pgd_t * pgd,unsigned long address)36*4882a593Smuzhiyun static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun return (p4d_t *)pgd;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun #define p4d_val(x) (pgd_val((x).pgd))
42*4882a593Smuzhiyun #define __p4d(x) ((p4d_t) { __pgd(x) })
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun #define pgd_page(pgd) (p4d_page((p4d_t){ pgd }))
45*4882a593Smuzhiyun #define pgd_page_vaddr(pgd) (p4d_page_vaddr((p4d_t){ pgd }))
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /*
48*4882a593Smuzhiyun * allocating and freeing a p4d is trivial: the 1-entry p4d is
49*4882a593Smuzhiyun * inside the pgd, so has no extra memory associated with it.
50*4882a593Smuzhiyun */
51*4882a593Smuzhiyun #define p4d_alloc_one(mm, address) NULL
52*4882a593Smuzhiyun #define p4d_free(mm, x) do { } while (0)
53*4882a593Smuzhiyun #define p4d_free_tlb(tlb, x, a) do { } while (0)
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun #undef p4d_addr_end
56*4882a593Smuzhiyun #define p4d_addr_end(addr, end) (end)
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */
59*4882a593Smuzhiyun #endif /* _PGTABLE_NOP4D_H */
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