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 #include <alloc.h> 14 #include <asm/setup.h> 15 #include <asm/page.h> 16 #include <asm/pgtable-hwdef.h> 17 18 #define pgd_none(pgd) (!pgd_val(pgd)) 19 #define pud_none(pud) (!pud_val(pud)) 20 #define pmd_none(pmd) (!pmd_val(pmd)) 21 #define pte_none(pte) (!pte_val(pte)) 22 23 #define pgd_index(addr) \ 24 (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 25 #define pgd_offset(pgtable, addr) ((pgtable) + pgd_index(addr)) 26 27 #define pgd_free(pgd) free(pgd) 28 static inline pgd_t *pgd_alloc(void) 29 { 30 pgd_t *pgd = memalign(PAGE_SIZE, PTRS_PER_PGD * sizeof(pgd_t)); 31 memset(pgd, 0, PTRS_PER_PGD * sizeof(pgd_t)); 32 return pgd; 33 } 34 35 #define pud_offset(pgd, addr) ((pud_t *)pgd) 36 #define pud_free(pud) 37 #define pud_alloc(pgd, addr) pud_offset(pgd, addr) 38 39 #define pmd_offset(pud, addr) ((pmd_t *)pud) 40 #define pmd_free(pmd) 41 #define pmd_alloc(pud, addr) pmd_offset(pud, addr) 42 43 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 44 { 45 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 46 } 47 48 #define pte_index(addr) \ 49 (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 50 #define pte_offset(pmd, addr) \ 51 (pmd_page_vaddr(*(pmd)) + pte_index(addr)) 52 53 #define pte_free(pte) free(pte) 54 static inline pte_t *pte_alloc_one(void) 55 { 56 pte_t *pte = memalign(PAGE_SIZE, PTRS_PER_PTE * sizeof(pte_t)); 57 memset(pte, 0, PTRS_PER_PTE * sizeof(pte_t)); 58 return pte; 59 } 60 static inline pte_t *pte_alloc(pmd_t *pmd, unsigned long addr) 61 { 62 if (pmd_none(*pmd)) { 63 pte_t *pte = pte_alloc_one(); 64 pmd_val(*pmd) = __pa(pte) | PMD_TYPE_TABLE; 65 } 66 return pte_offset(pmd, addr); 67 } 68 69 #endif /* _ASMARM64_PGTABLE_H_ */ 70