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61 lines
1.8 KiB
61 lines
1.8 KiB
#ifndef _PGTABLE_NOPUD_H |
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#define _PGTABLE_NOPUD_H |
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#ifndef __ASSEMBLY__ |
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#define __PAGETABLE_PUD_FOLDED |
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/* |
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* Having the pud type consist of a pgd gets the size right, and allows |
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* us to conceptually access the pgd entry that this pud is folded into |
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* without casting. |
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*/ |
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typedef struct { pgd_t pgd; } pud_t; |
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#define PUD_SHIFT PGDIR_SHIFT |
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#define PTRS_PER_PUD 1 |
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#define PUD_SIZE (1UL << PUD_SHIFT) |
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#define PUD_MASK (~(PUD_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 pud is never bad, and a pud 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 pud_ERROR(pud) (pgd_ERROR((pud).pgd)) |
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#define pgd_populate(mm, pgd, pud) do { } while (0) |
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/* |
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* (puds 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_pud((pud_t *)(pgdptr), (pud_t) { pgdval }) |
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static inline pud_t * pud_offset(pgd_t * pgd, unsigned long address) |
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{ |
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return (pud_t *)pgd; |
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} |
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#define pud_val(x) (pgd_val((x).pgd)) |
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#define __pud(x) ((pud_t) { __pgd(x) } ) |
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#define pgd_page(pgd) (pud_page((pud_t){ pgd })) |
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#define pgd_page_vaddr(pgd) (pud_page_vaddr((pud_t){ pgd })) |
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/* |
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* allocating and freeing a pud is trivial: the 1-entry pud 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 pud_alloc_one(mm, address) NULL |
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#define pud_free(mm, x) do { } while (0) |
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#define __pud_free_tlb(tlb, x, a) do { } while (0) |
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#undef pud_addr_end |
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#define pud_addr_end(addr, end) (end) |
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#endif /* __ASSEMBLY__ */ |
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#endif /* _PGTABLE_NOPUD_H */
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