1 #ifndef _ASMARM_PGTABLE_H_ 2 #define _ASMARM_PGTABLE_H_ 3 /* 4 * Adapted from arch/arm/include/asm/pgtable.h 5 * arch/arm/include/asm/pgtable-3level.h 6 * arch/arm/include/asm/pgalloc.h 7 * include/asm-generic/pgtable-nopud.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(L1_CACHE_BYTES, 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 static inline pmd_t *pud_page_vaddr(pud_t pud) 44 { 45 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); 46 } 47 48 #define pmd_index(addr) \ 49 (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 50 #define pmd_offset(pud, addr) \ 51 (pud_page_vaddr(*(pud)) + pmd_index(addr)) 52 53 #define pmd_free(pmd) free(pmd) 54 static inline pmd_t *pmd_alloc_one(void) 55 { 56 pmd_t *pmd = memalign(PAGE_SIZE, PTRS_PER_PMD * sizeof(pmd_t)); 57 memset(pmd, 0, PTRS_PER_PMD * sizeof(pmd_t)); 58 return pmd; 59 } 60 static inline pmd_t *pmd_alloc(pud_t *pud, unsigned long addr) 61 { 62 if (pud_none(*pud)) { 63 pmd_t *pmd = pmd_alloc_one(); 64 pud_val(*pud) = __pa(pmd) | PMD_TYPE_TABLE; 65 } 66 return pmd_offset(pud, addr); 67 } 68 69 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 70 { 71 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 72 } 73 74 #define pte_index(addr) \ 75 (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 76 #define pte_offset(pmd, addr) \ 77 (pmd_page_vaddr(*(pmd)) + pte_index(addr)) 78 79 #define pte_free(pte) free(pte) 80 static inline pte_t *pte_alloc_one(void) 81 { 82 pte_t *pte = memalign(PAGE_SIZE, PTRS_PER_PTE * sizeof(pte_t)); 83 memset(pte, 0, PTRS_PER_PTE * sizeof(pte_t)); 84 return pte; 85 } 86 static inline pte_t *pte_alloc(pmd_t *pmd, unsigned long addr) 87 { 88 if (pmd_none(*pmd)) { 89 pte_t *pte = pte_alloc_one(); 90 pmd_val(*pmd) = __pa(pte) | PMD_TYPE_TABLE; 91 } 92 return pte_offset(pmd, addr); 93 } 94 95 #endif /* _ASMARM_PGTABLE_H_ */ 96