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_vaddr(pud) (pmd_page_vaddr((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(mm, 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 */ 66