74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _PGTABLE_NOPMD_H
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#define _PGTABLE_NOPMD_H
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#ifndef __ASSEMBLY__
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#include <asm-generic/pgtable-nopud.h>
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struct mm_struct;
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#define __PAGETABLE_PMD_FOLDED 1
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/*
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* Having the pmd type consist of a pud gets the size right, and allows
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* us to conceptually access the pud entry that this pmd is folded into
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* without casting.
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*/
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typedef struct { pud_t pud; } pmd_t;
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#define PMD_SHIFT PUD_SHIFT
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#define PTRS_PER_PMD 1
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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/*
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* The "pud_xxx()" functions here are trivial for a folded two-level
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* setup: the pmd is never bad, and a pmd always exists (as it's folded
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* into the pud entry)
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*/
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static inline int pud_none(pud_t pud) { return 0; }
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static inline int pud_bad(pud_t pud) { return 0; }
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static inline int pud_present(pud_t pud) { return 1; }
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static inline int pud_user(pud_t pud) { return 0; }
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static inline int pud_leaf(pud_t pud) { return 0; }
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static inline void pud_clear(pud_t *pud) { }
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#define pmd_ERROR(pmd) (pud_ERROR((pmd).pud))
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#define pud_populate(mm, pmd, pte) do { } while (0)
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/*
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* (pmds are folded into puds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
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static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
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{
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return (pmd_t *)pud;
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}
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#define pmd_offset pmd_offset
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#define pmd_val(x) (pud_val((x).pud))
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#define __pmd(x) ((pmd_t) { __pud(x) } )
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#define pud_page(pud) (pmd_page((pmd_t){ pud }))
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#define pud_pgtable(pud) ((pmd_t *)(pmd_page_vaddr((pmd_t){ pud })))
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/*
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* allocating and freeing a pmd is trivial: the 1-entry pmd is
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* inside the pud, so has no extra memory associated with it.
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*/
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#define pmd_alloc_one(mm, address) NULL
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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{
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}
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#define pmd_free_tlb(tlb, x, a) do { } while (0)
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#undef pmd_addr_end
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#define pmd_addr_end(addr, end) (end)
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#endif /* __ASSEMBLY__ */
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#endif /* _PGTABLE_NOPMD_H */
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