| 1 |
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| 2 | #ifndef _PGTABLE_NOP4D_H
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| 3 | #define _PGTABLE_NOP4D_H
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| 4 |
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| 5 | #ifndef __ASSEMBLER__
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| 6 |
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| 7 | #define __PAGETABLE_P4D_FOLDED 1
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| 8 |
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| 9 | typedef struct { pgd_t pgd; } p4d_t;
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| 10 |
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| 11 | #define P4D_SHIFT PGDIR_SHIFT
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| 12 | #define PTRS_PER_P4D 1
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| 13 | #define P4D_SIZE (1UL << P4D_SHIFT)
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| 14 | #define P4D_MASK (~(P4D_SIZE-1))
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| 15 |
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| 16 | |
| 17 | * The "pgd_xxx()" functions here are trivial for a folded two-level
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| 18 | * setup: the p4d is never bad, and a p4d always exists (as it's folded
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| 19 | * into the pgd entry)
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| 20 |
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| 21 | static inline int pgd_none(pgd_t pgd) { return 0; }
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| 22 | static inline int pgd_bad(pgd_t pgd) { return 0; }
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| 23 | static inline int pgd_present(pgd_t pgd) { return 1; }
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| 24 | static inline void pgd_clear(pgd_t *pgd) { }
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| 25 | #define p4d_ERROR(p4d) (pgd_ERROR((p4d).pgd))
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| 26 |
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| 27 | #define pgd_populate(mm, pgd, p4d) do { } while (0)
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| 28 | #define pgd_populate_safe(mm, pgd, p4d) do { } while (0)
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| 29 | |
| 30 | * (p4ds are folded into pgds so this doesn't get actually called,
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| 31 | * but the define is needed for a generic inline function.)
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| 32 |
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| 33 | #define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval })
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| 34 |
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| 35 | static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
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| 36 | {
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| 37 | return (p4d_t *)pgd;
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| 38 | }
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| 39 |
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| 40 | #define p4d_val(x) (pgd_val((x).pgd))
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| 41 | #define __p4d(x) ((p4d_t) { __pgd(x) })
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| 42 |
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| 43 | #define pgd_page(pgd) (p4d_page((p4d_t){ pgd }))
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| 44 | #define pgd_page_vaddr(pgd) ((unsigned long)(p4d_pgtable((p4d_t){ pgd })))
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| 45 |
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| 46 | |
| 47 | * allocating and freeing a p4d is trivial: the 1-entry p4d is
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| 48 | * inside the pgd, so has no extra memory associated with it.
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| 49 |
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| 50 | #define p4d_alloc_one(mm, address) NULL
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| 51 | #define p4d_free(mm, x) do { } while (0)
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| 52 | #define p4d_free_tlb(tlb, x, a) do { } while (0)
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| 53 |
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| 54 | #undef p4d_addr_end
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| 55 | #define p4d_addr_end(addr, end) (end)
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| 56 |
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| 57 | #endif
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| 58 | #endif
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