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편집 파일: pgtable-nopud.h

/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _PGTABLE_NOPUD_H #define _PGTABLE_NOPUD_H #ifndef __ASSEMBLY__ #include <asm-generic/pgtable-nop4d.h> #define __PAGETABLE_PUD_FOLDED 1 /* * Having the pud type consist of a p4d gets the size right, and allows * us to conceptually access the p4d entry that this pud is folded into * without casting. */ typedef struct { p4d_t p4d; } pud_t; #define PUD_SHIFT P4D_SHIFT #define PTRS_PER_PUD 1 #define PUD_SIZE (1UL << PUD_SHIFT) #define PUD_MASK (~(PUD_SIZE-1)) /* * The "p4d_xxx()" functions here are trivial for a folded two-level * setup: the pud is never bad, and a pud always exists (as it's folded * into the p4d entry) */ static inline int p4d_none(p4d_t p4d) { return 0; } static inline int p4d_bad(p4d_t p4d) { return 0; } static inline int p4d_present(p4d_t p4d) { return 1; } static inline void p4d_clear(p4d_t *p4d) { } #define pud_ERROR(pud) (p4d_ERROR((pud).p4d)) #define p4d_populate(mm, p4d, pud) do { } while (0) #define p4d_populate_safe(mm, p4d, pud) do { } while (0) /* * (puds are folded into p4ds so this doesn't get actually called, * but the define is needed for a generic inline function.) */ #define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval }) static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) { return (pud_t *)p4d; } #define pud_offset pud_offset #define pud_val(x) (p4d_val((x).p4d)) #define __pud(x) ((pud_t) { __p4d(x) }) #define p4d_page(p4d) (pud_page((pud_t){ p4d })) #define p4d_pgtable(p4d) ((pud_t *)(pud_pgtable((pud_t){ p4d }))) /* * allocating and freeing a pud is trivial: the 1-entry pud is * inside the p4d, so has no extra memory associated with it. */ #define pud_alloc_one(mm, address) NULL #define pud_free(mm, x) do { } while (0) #define pud_free_tlb(tlb, x, a) do { } while (0) #undef pud_addr_end #define pud_addr_end(addr, end) (end) #endif /* __ASSEMBLY__ */ #endif /* _PGTABLE_NOPUD_H */