projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef _PGTABLE_NOPMD_H |
| 2 | #define _PGTABLE_NOPMD_H | |
| 3 | ||
| 4 | #ifndef __ASSEMBLY__ | |
| 5 | ||
| 6 | #include <asm-generic/pgtable-nopud.h> | |
| 7 | ||
| 8 | #define __PAGETABLE_PMD_FOLDED | |
| 9 | ||
| 10 | /* | |
| 11 | * Having the pmd type consist of a pud gets the size right, and allows | |
| 12 | * us to conceptually access the pud entry that this pmd is folded into | |
| 13 | * without casting. | |
| 14 | */ | |
| 15 | typedef struct { pud_t pud; } pmd_t; | |
| 16 | ||
| 17 | #define PMD_SHIFT PUD_SHIFT | |
| 18 | #define PTRS_PER_PMD 1 | |
| 19 | #define PMD_SIZE (1UL << PMD_SHIFT) | |
| 20 | #define PMD_MASK (~(PMD_SIZE-1)) | |
| 21 | ||
| 22 | /* | |
| 23 | * The "pud_xxx()" functions here are trivial for a folded two-level | |
| 24 | * setup: the pmd is never bad, and a pmd always exists (as it's folded | |
| 25 | * into the pud entry) | |
| 26 | */ | |
| 27 | static inline int pud_none(pud_t pud) { return 0; } | |
| 28 | static inline int pud_bad(pud_t pud) { return 0; } | |
| 29 | static inline int pud_present(pud_t pud) { return 1; } | |
| 30 | static inline void pud_clear(pud_t *pud) { } | |
| 31 | #define pmd_ERROR(pmd) (pud_ERROR((pmd).pud)) | |
| 32 | ||
| 33 | #define pud_populate(mm, pmd, pte) do { } while (0) | |
| 34 | ||
| 35 | /* | |
| 36 | * (pmds are folded into puds so this doesn't get actually called, | |
| 37 | * but the define is needed for a generic inline function.) | |
| 38 | */ | |
| 39 | #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval }) | |
| 40 | ||
| 41 | static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address) | |
| 42 | { | |
| 43 | return (pmd_t *)pud; | |
| 44 | } | |
| 45 | ||
| 46 | #define pmd_val(x) (pud_val((x).pud)) | |
| 47 | #define __pmd(x) ((pmd_t) { __pud(x) } ) | |
| 48 | ||
| 49 | #define pud_page(pud) (pmd_page((pmd_t){ pud })) | |
| 50 | #define pud_page_kernel(pud) (pmd_page_kernel((pmd_t){ pud })) | |
| 51 | ||
| 52 | /* | |
| 53 | * allocating and freeing a pmd is trivial: the 1-entry pmd is | |
| 54 | * inside the pud, so has no extra memory associated with it. | |
| 55 | */ | |
| 56 | #define pmd_alloc_one(mm, address) NULL | |
| 57 | #define pmd_free(x) do { } while (0) | |
| 58 | #define __pmd_free_tlb(tlb, x) do { } while (0) | |
| 59 | ||
| 60 | #undef pmd_addr_end | |
| 61 | #define pmd_addr_end(addr, end) (end) | |
| 62 | ||
| 63 | #endif /* __ASSEMBLY__ */ | |
| 64 | ||
| 65 | #endif /* _PGTABLE_NOPMD_H */ |