1 #ifndef _ASMARM64_PGTABLE_H_ 2 #define _ASMARM64_PGTABLE_H_ 3 /* 4 * Adapted from arch/arm64/include/asm/pgtable.h 5 * include/asm-generic/pgtable-nopmd.h 6 * include/asm-generic/pgtable-nopud.h 7 * include/linux/mm.h 8 * 9 * Note: some Linux function APIs have been modified. Nothing crazy, 10 * but if a function took, for example, an mm_struct, then 11 * that was either removed or replaced. 12 * 13 * Copyright (C) 2017, Red Hat Inc, Andrew Jones <drjones@redhat.com> 14 * 15 * This work is licensed under the terms of the GNU GPL, version 2. 16 */ 17 #include <alloc.h> 18 #include <asm/setup.h> 19 #include <asm/page.h> 20 #include <asm/pgtable-hwdef.h> 21 22 #define pgd_none(pgd) (!pgd_val(pgd)) 23 #define pud_none(pud) (!pud_val(pud)) 24 #define pmd_none(pmd) (!pmd_val(pmd)) 25 #define pte_none(pte) (!pte_val(pte)) 26 27 #define pgd_index(addr) \ 28 (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 29 #define pgd_offset(pgtable, addr) ((pgtable) + pgd_index(addr)) 30 31 #define pgd_free(pgd) free(pgd) 32 static inline pgd_t *pgd_alloc(void) 33 { 34 pgd_t *pgd = memalign(PAGE_SIZE, PTRS_PER_PGD * sizeof(pgd_t)); 35 memset(pgd, 0, PTRS_PER_PGD * sizeof(pgd_t)); 36 return pgd; 37 } 38 39 #define pud_offset(pgd, addr) ((pud_t *)pgd) 40 #define pud_free(pud) 41 #define pud_alloc(pgd, addr) pud_offset(pgd, addr) 42 43 #define pmd_offset(pud, addr) ((pmd_t *)pud) 44 #define pmd_free(pmd) 45 #define pmd_alloc(pud, addr) pmd_offset(pud, addr) 46 47 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 48 { 49 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 50 } 51 52 #define pte_index(addr) \ 53 (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 54 #define pte_offset(pmd, addr) \ 55 (pmd_page_vaddr(*(pmd)) + pte_index(addr)) 56 57 #define pte_free(pte) free(pte) 58 static inline pte_t *pte_alloc_one(void) 59 { 60 pte_t *pte = memalign(PAGE_SIZE, PTRS_PER_PTE * sizeof(pte_t)); 61 memset(pte, 0, PTRS_PER_PTE * sizeof(pte_t)); 62 return pte; 63 } 64 static inline pte_t *pte_alloc(pmd_t *pmd, unsigned long addr) 65 { 66 if (pmd_none(*pmd)) { 67 pte_t *pte = pte_alloc_one(); 68 pmd_val(*pmd) = __pa(pte) | PMD_TYPE_TABLE; 69 } 70 return pte_offset(pmd, addr); 71 } 72 73 #endif /* _ASMARM64_PGTABLE_H_ */ 74