1 #ifndef _PGTABLE_NOPMD_H 2 #define _PGTABLE_NOPMD_H 3 4 #ifndef __ASSEMBLY__ 5 6 #include <asm-generic/pgtable-nopud.h> 7 8 struct mm_struct; 9 10 #define __PAGETABLE_PMD_FOLDED 11 12 /* 13 * Having the pmd type consist of a pud gets the size right, and allows 14 * us to conceptually access the pud entry that this pmd is folded into 15 * without casting. 16 */ 17 typedef struct { pud_t pud; } pmd_t; 18 19 #define PMD_SHIFT PUD_SHIFT 20 #define PTRS_PER_PMD 1 21 #define PMD_SIZE (1UL << PMD_SHIFT) 22 #define PMD_MASK (~(PMD_SIZE-1)) 23 24 /* 25 * The "pud_xxx()" functions here are trivial for a folded two-level 26 * setup: the pmd is never bad, and a pmd always exists (as it's folded 27 * into the pud entry) 28 */ 29 static inline int pud_none(pud_t pud) { return 0; } 30 static inline int pud_bad(pud_t pud) { return 0; } 31 static inline int pud_present(pud_t pud) { return 1; } 32 static inline void pud_clear(pud_t *pud) { } 33 #define pmd_ERROR(pmd) (pud_ERROR((pmd).pud)) 34 35 #define pud_populate(mm, pmd, pte) do { } while (0) 36 37 /* 38 * (pmds are folded into puds so this doesn't get actually called, 39 * but the define is needed for a generic inline function.) 40 */ 41 #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval }) 42 43 static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address) 44 { 45 return (pmd_t *)pud; 46 } 47 48 #define pmd_val(x) (pud_val((x).pud)) 49 #define __pmd(x) ((pmd_t) { __pud(x) } ) 50 51 #define pud_page(pud) (pmd_page((pmd_t){ pud })) 52 #define pud_page_vaddr(pud) (pmd_page_vaddr((pmd_t){ pud })) 53 54 /* 55 * allocating and freeing a pmd is trivial: the 1-entry pmd is 56 * inside the pud, so has no extra memory associated with it. 57 */ 58 #define pmd_alloc_one(mm, address) NULL 59 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 60 { 61 } 62 #define __pmd_free_tlb(tlb, x, a) do { } while (0) 63 64 #undef pmd_addr_end 65 #define pmd_addr_end(addr, end) (end) 66 67 #endif /* __ASSEMBLY__ */ 68 69 #endif /* _PGTABLE_NOPMD_H */ 70