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편집 파일: pgtable-nop4d.h

/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _PGTABLE_NOP4D_H #define _PGTABLE_NOP4D_H #ifndef __ASSEMBLY__ #define __PAGETABLE_P4D_FOLDED 1 typedef struct { pgd_t pgd; } p4d_t; #define P4D_SHIFT PGDIR_SHIFT #define PTRS_PER_P4D 1 #define P4D_SIZE (1UL << P4D_SHIFT) #define P4D_MASK (~(P4D_SIZE-1)) /* * The "pgd_xxx()" functions here are trivial for a folded two-level * setup: the p4d is never bad, and a p4d always exists (as it's folded * into the pgd entry) */ static inline int pgd_none(pgd_t pgd) { return 0; } static inline int pgd_bad(pgd_t pgd) { return 0; } static inline int pgd_present(pgd_t pgd) { return 1; } static inline void pgd_clear(pgd_t *pgd) { } #define p4d_ERROR(p4d) (pgd_ERROR((p4d).pgd)) #define pgd_populate(mm, pgd, p4d) do { } while (0) #define pgd_populate_safe(mm, pgd, p4d) do { } while (0) /* * (p4ds are folded into pgds so this doesn't get actually called, * but the define is needed for a generic inline function.) */ #define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval }) static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) { return (p4d_t *)pgd; } #define p4d_val(x) (pgd_val((x).pgd)) #define __p4d(x) ((p4d_t) { __pgd(x) }) #define pgd_page(pgd) (p4d_page((p4d_t){ pgd })) #define pgd_page_vaddr(pgd) ((unsigned long)(p4d_pgtable((p4d_t){ pgd }))) /* * allocating and freeing a p4d is trivial: the 1-entry p4d is * inside the pgd, so has no extra memory associated with it. */ #define p4d_alloc_one(mm, address) NULL #define p4d_free(mm, x) do { } while (0) #define p4d_free_tlb(tlb, x, a) do { } while (0) #undef p4d_addr_end #define p4d_addr_end(addr, end) (end) #endif /* __ASSEMBLY__ */ #endif /* _PGTABLE_NOP4D_H */