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 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 void pud_clear(pud_t *pud) { } 34 #define pmd_ERROR(pmd) (pud_ERROR((pmd).pud)) 35 36 #define pud_populate(mm, pmd, pte) do { } while (0) 37 38 /* 39 * (pmds are folded into puds so this doesn't get actually called, 40 * but the define is needed for a generic inline function.) 41 */ 42 #define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval }) 43 44 static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address) 45 { 46 return (pmd_t *)pud; 47 } 48 49 #define pmd_val(x) (pud_val((x).pud)) 50 #define __pmd(x) ((pmd_t) { __pud(x) } ) 51 52 #define pud_page(pud) (pmd_page((pmd_t){ pud })) 53 #define pud_page_vaddr(pud) (pmd_page_vaddr((pmd_t){ pud })) 54 55 /* 56 * allocating and freeing a pmd is trivial: the 1-entry pmd is 57 * inside the pud, so has no extra memory associated with it. 58 */ 59 #define pmd_alloc_one(mm, address) NULL 60 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 61 { 62 } 63 #define __pmd_free_tlb(tlb, x, a) do { } while (0) 64 65 #undef pmd_addr_end 66 #define pmd_addr_end(addr, end) (end) 67 68 #endif /* __ASSEMBLY__ */ 69 70 #endif /* _PGTABLE_NOPMD_H */ 71