1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _PGTABLE_NOPMD_H 3 #define _PGTABLE_NOPMD_H 4 5 #ifndef __ASSEMBLY__ 6 7 #include <asm-generic/pgtable-nopud.h> 8 9 struct mm_struct; 10 11 #define __PAGETABLE_PMD_FOLDED 1 12 13 /* 14 * Having the pmd type consist of a pud gets the size right, and allows 15 * us to conceptually access the pud entry that this pmd is folded into 16 * without casting. 17 */ 18 typedef struct { pud_t pud; } pmd_t; 19 20 #define PMD_SHIFT PUD_SHIFT 21 #define PTRS_PER_PMD 1 22 #define PMD_SIZE (1UL << PMD_SHIFT) 23 #define PMD_MASK (~(PMD_SIZE-1)) 24 25 /* 26 * The "pud_xxx()" functions here are trivial for a folded two-level 27 * setup: the pmd is never bad, and a pmd always exists (as it's folded 28 * into the pud entry) 29 */ 30 static inline int pud_none(pud_t pud) { return 0; } 31 static inline int pud_bad(pud_t pud) { return 0; } 32 static inline int pud_present(pud_t pud) { return 1; } 33 static inline int pud_user(pud_t pud) { return 0; } 34 static inline int pud_leaf(pud_t pud) { return 0; } 35 static inline void pud_clear(pud_t *pud) { } 36 #define pmd_ERROR(pmd) (pud_ERROR((pmd).pud)) 37 38 #define pud_populate(mm, pmd, pte) do { } while (0) 39 40 /* 41 * (pmds are folded into puds so this doesn't get actually called, 42 * but the define is needed for a generic inline function.) 43 */ 44 #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval }) 45 46 static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address) 47 { 48 return (pmd_t *)pud; 49 } 50 #define pmd_offset pmd_offset 51 52 #define pmd_val(x) (pud_val((x).pud)) 53 #define __pmd(x) ((pmd_t) { __pud(x) } ) 54 55 #define pud_page(pud) (pmd_page((pmd_t){ pud })) 56 #define pud_pgtable(pud) ((pmd_t *)(pmd_page_vaddr((pmd_t){ pud }))) 57 58 /* 59 * allocating and freeing a pmd is trivial: the 1-entry pmd is 60 * inside the pud, so has no extra memory associated with it. 61 */ 62 #define pmd_alloc_one(mm, address) NULL 63 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 64 { 65 } 66 #define pmd_free_tlb(tlb, x, a) do { } while (0) 67 68 #undef pmd_addr_end 69 #define pmd_addr_end(addr, end) (end) 70 71 #endif /* __ASSEMBLY__ */ 72 73 #endif /* _PGTABLE_NOPMD_H */ 74