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59 lines
1.7 KiB
59 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _PGTABLE_NOP4D_H |
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#define _PGTABLE_NOP4D_H |
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#ifndef __ASSEMBLY__ |
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#define __PAGETABLE_P4D_FOLDED 1 |
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typedef struct { pgd_t pgd; } p4d_t; |
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#define P4D_SHIFT PGDIR_SHIFT |
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#define MAX_PTRS_PER_P4D 1 |
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#define PTRS_PER_P4D 1 |
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#define P4D_SIZE (1UL << P4D_SHIFT) |
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#define P4D_MASK (~(P4D_SIZE-1)) |
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/* |
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* The "pgd_xxx()" functions here are trivial for a folded two-level |
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* setup: the p4d is never bad, and a p4d always exists (as it's folded |
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* into the pgd entry) |
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*/ |
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static inline int pgd_none(pgd_t pgd) { return 0; } |
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static inline int pgd_bad(pgd_t pgd) { return 0; } |
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static inline int pgd_present(pgd_t pgd) { return 1; } |
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static inline void pgd_clear(pgd_t *pgd) { } |
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#define p4d_ERROR(p4d) (pgd_ERROR((p4d).pgd)) |
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#define pgd_populate(mm, pgd, p4d) do { } while (0) |
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#define pgd_populate_safe(mm, pgd, p4d) do { } while (0) |
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/* |
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* (p4ds are folded into pgds 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_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval }) |
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static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) |
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{ |
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return (p4d_t *)pgd; |
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} |
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#define p4d_val(x) (pgd_val((x).pgd)) |
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#define __p4d(x) ((p4d_t) { __pgd(x) }) |
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#define pgd_page(pgd) (p4d_page((p4d_t){ pgd })) |
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#define pgd_page_vaddr(pgd) (p4d_page_vaddr((p4d_t){ pgd })) |
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/* |
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* allocating and freeing a p4d is trivial: the 1-entry p4d is |
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* inside the pgd, so has no extra memory associated with it. |
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*/ |
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#define p4d_alloc_one(mm, address) NULL |
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#define p4d_free(mm, x) do { } while (0) |
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#define p4d_free_tlb(tlb, x, a) do { } while (0) |
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#undef p4d_addr_end |
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#define p4d_addr_end(addr, end) (end) |
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#endif /* __ASSEMBLY__ */ |
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#endif /* _PGTABLE_NOP4D_H */
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