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편집 파일: pgtable-nopmd.h

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