| 1 |
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| 2 | #ifndef _PGTABLE_NOPUD_H
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| 3 | #define _PGTABLE_NOPUD_H
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| 4 |
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| 5 | #ifndef __ASSEMBLER__
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| 6 |
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| 7 | #include <asm-generic/pgtable-nop4d.h>
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| 8 |
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| 9 | #define __PAGETABLE_PUD_FOLDED 1
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| 10 |
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| 11 | |
| 12 | * Having the pud type consist of a p4d gets the size right, and allows
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| 13 | * us to conceptually access the p4d entry that this pud is folded into
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| 14 | * without casting.
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| 15 |
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| 16 | typedef struct { p4d_t p4d; } pud_t;
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| 17 |
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| 18 | #define PUD_SHIFT P4D_SHIFT
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| 19 | #define PTRS_PER_PUD 1
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| 20 | #define PUD_SIZE (1UL << PUD_SHIFT)
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| 21 | #define PUD_MASK (~(PUD_SIZE-1))
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| 22 |
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| 23 | |
| 24 | * The "p4d_xxx()" functions here are trivial for a folded two-level
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| 25 | * setup: the pud is never bad, and a pud always exists (as it's folded
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| 26 | * into the p4d entry)
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| 27 |
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| 28 | static inline int p4d_none(p4d_t p4d) { return 0; }
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| 29 | static inline int p4d_bad(p4d_t p4d) { return 0; }
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| 30 | static inline int p4d_present(p4d_t p4d) { return 1; }
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| 31 | static inline void p4d_clear(p4d_t *p4d) { }
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| 32 | #define pud_ERROR(pud) (p4d_ERROR((pud).p4d))
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| 33 |
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| 34 | #define p4d_populate(mm, p4d, pud) do { } while (0)
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| 35 | #define p4d_populate_safe(mm, p4d, pud) do { } while (0)
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| 36 | |
| 37 | * (puds are folded into p4ds so this doesn't get actually called,
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| 38 | * but the define is needed for a generic inline function.)
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| 39 |
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| 40 | #define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
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| 41 |
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| 42 | static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
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| 43 | {
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| 44 | return (pud_t *)p4d;
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| 45 | }
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| 46 | #define pud_offset pud_offset
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| 47 |
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| 48 | #define pud_val(x) (p4d_val((x).p4d))
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| 49 | #define __pud(x) ((pud_t) { __p4d(x) })
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| 50 |
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| 51 | #define p4d_page(p4d) (pud_page((pud_t){ p4d }))
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| 52 | #define p4d_pgtable(p4d) ((pud_t *)(pud_pgtable((pud_t){ p4d })))
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| 53 |
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| 54 | |
| 55 | * allocating and freeing a pud is trivial: the 1-entry pud is
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| 56 | * inside the p4d, so has no extra memory associated with it.
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| 57 |
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| 58 | #define pud_alloc_one(mm, address) NULL
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| 59 | #define pud_free(mm, x) do { } while (0)
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| 60 | #define pud_free_tlb(tlb, x, a) do { } while (0)
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| 61 |
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| 62 | #undef pud_addr_end
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| 63 | #define pud_addr_end(addr, end) (end)
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| 64 |
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| 65 | #endif
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| 66 | #endif
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