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| 2 | #ifndef __ASM_SH_PGTABLE_3LEVEL_H
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| 3 | #define __ASM_SH_PGTABLE_3LEVEL_H
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| 4 |
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| 5 | #include <asm-generic/pgtable-nopud.h>
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| 6 |
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| 7 | |
| 8 | * Some cores need a 3-level page table layout, for example when using
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| 9 | * 64-bit PTEs and 4K pages.
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| 10 |
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| 11 | #define PAGETABLE_LEVELS 3
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| 12 |
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| 13 | #define PTE_MAGNITUDE 3
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| 14 |
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| 15 |
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| 16 | #define PGDIR_SHIFT 30
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| 17 |
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| 18 | #define PTRS_PER_PGD 4
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| 19 | #define USER_PTRS_PER_PGD 2
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| 20 |
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| 21 |
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| 22 | #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
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| 23 | #define PMD_SIZE (1UL << PMD_SHIFT)
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| 24 | #define PMD_MASK (~(PMD_SIZE-1))
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| 25 |
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| 26 | #define PTRS_PER_PMD ((1 << PGDIR_SHIFT) / PMD_SIZE)
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| 27 |
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| 28 | #define pmd_ERROR(e) \
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| 29 | printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
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| 30 |
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| 31 | typedef union {
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| 32 | struct {
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| 33 | unsigned long pmd_low;
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| 34 | unsigned long pmd_high;
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| 35 | };
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| 36 | unsigned long long pmd;
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| 37 | } pmd_t;
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| 38 | #define pmd_val(x) ((x).pmd)
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| 39 | #define __pmd(x) ((pmd_t) { .pmd = (x) } )
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| 40 |
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| 41 | static inline pmd_t *pud_pgtable(pud_t pud)
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| 42 | {
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| 43 | return (pmd_t *)(unsigned long)pud_val(pud);
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| 44 | }
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| 45 |
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| 46 |
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| 47 | #define pud_page(pud) NULL
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| 48 | #define pud_none(x) (!pud_val(x))
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| 49 | #define pud_present(x) (pud_val(x))
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| 50 | #define pud_clear(xp) do { set_pud(xp, __pud(0)); } while (0)
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| 51 | #define pud_bad(x) (pud_val(x) & ~PAGE_MASK)
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| 52 |
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| 53 | |
| 54 | * (puds are folded into pgds so this doesn't get actually called,
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| 55 | * but the define is needed for a generic inline function.)
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| 56 |
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| 57 | #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
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| 58 |
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| 59 | #endif
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