1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _PGTABLE_NOPMD_H
3*4882a593Smuzhiyun #define _PGTABLE_NOPMD_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #ifndef __ASSEMBLY__
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <asm-generic/pgtable-nopud.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun struct mm_struct;
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #define __PAGETABLE_PMD_FOLDED 1
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun /*
14*4882a593Smuzhiyun * Having the pmd type consist of a pud gets the size right, and allows
15*4882a593Smuzhiyun * us to conceptually access the pud entry that this pmd is folded into
16*4882a593Smuzhiyun * without casting.
17*4882a593Smuzhiyun */
18*4882a593Smuzhiyun typedef struct { pud_t pud; } pmd_t;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #define PMD_SHIFT PUD_SHIFT
21*4882a593Smuzhiyun #define PTRS_PER_PMD 1
22*4882a593Smuzhiyun #define PMD_SIZE (1UL << PMD_SHIFT)
23*4882a593Smuzhiyun #define PMD_MASK (~(PMD_SIZE-1))
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /*
26*4882a593Smuzhiyun * The "pud_xxx()" functions here are trivial for a folded two-level
27*4882a593Smuzhiyun * setup: the pmd is never bad, and a pmd always exists (as it's folded
28*4882a593Smuzhiyun * into the pud entry)
29*4882a593Smuzhiyun */
pud_none(pud_t pud)30*4882a593Smuzhiyun static inline int pud_none(pud_t pud) { return 0; }
pud_bad(pud_t pud)31*4882a593Smuzhiyun static inline int pud_bad(pud_t pud) { return 0; }
pud_present(pud_t pud)32*4882a593Smuzhiyun static inline int pud_present(pud_t pud) { return 1; }
pud_clear(pud_t * pud)33*4882a593Smuzhiyun static inline void pud_clear(pud_t *pud) { }
34*4882a593Smuzhiyun #define pmd_ERROR(pmd) (pud_ERROR((pmd).pud))
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun #define pud_populate(mm, pmd, pte) do { } while (0)
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun /*
39*4882a593Smuzhiyun * (pmds are folded into puds so this doesn't get actually called,
40*4882a593Smuzhiyun * but the define is needed for a generic inline function.)
41*4882a593Smuzhiyun */
42*4882a593Smuzhiyun #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
43*4882a593Smuzhiyun
pmd_offset(pud_t * pud,unsigned long address)44*4882a593Smuzhiyun static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun return (pmd_t *)pud;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun #define pmd_offset pmd_offset
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun #define pmd_val(x) (pud_val((x).pud))
51*4882a593Smuzhiyun #define __pmd(x) ((pmd_t) { __pud(x) } )
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun #define pud_page(pud) (pmd_page((pmd_t){ pud }))
54*4882a593Smuzhiyun #define pud_page_vaddr(pud) (pmd_page_vaddr((pmd_t){ pud }))
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun /*
57*4882a593Smuzhiyun * allocating and freeing a pmd is trivial: the 1-entry pmd is
58*4882a593Smuzhiyun * inside the pud, so has no extra memory associated with it.
59*4882a593Smuzhiyun */
60*4882a593Smuzhiyun #define pmd_alloc_one(mm, address) NULL
pmd_free(struct mm_struct * mm,pmd_t * pmd)61*4882a593Smuzhiyun static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun #define pmd_free_tlb(tlb, x, a) do { } while (0)
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun #undef pmd_addr_end
67*4882a593Smuzhiyun #define pmd_addr_end(addr, end) (end)
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun #endif /* _PGTABLE_NOPMD_H */
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