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 #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(L1_CACHE_BYTES, 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 static inline pmd_t *pud_page_vaddr(pud_t pud) 40 { 41 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); 42 } 43 44 #define pmd_index(addr) \ 45 (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 46 #define pmd_offset(pud, addr) \ 47 (pud_page_vaddr(*(pud)) + pmd_index(addr)) 48 49 #define pmd_free(pmd) free(pmd) 50 static inline pmd_t *pmd_alloc_one(void) 51 { 52 pmd_t *pmd = memalign(PAGE_SIZE, PTRS_PER_PMD * sizeof(pmd_t)); 53 memset(pmd, 0, PTRS_PER_PMD * sizeof(pmd_t)); 54 return pmd; 55 } 56 static inline pmd_t *pmd_alloc(pud_t *pud, unsigned long addr) 57 { 58 if (pud_none(*pud)) { 59 pmd_t *pmd = pmd_alloc_one(); 60 pud_val(*pud) = __pa(pmd) | PMD_TYPE_TABLE; 61 } 62 return pmd_offset(pud, addr); 63 } 64 65 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 66 { 67 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 68 } 69 70 #define pte_index(addr) \ 71 (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 72 #define pte_offset(pmd, addr) \ 73 (pmd_page_vaddr(*(pmd)) + pte_index(addr)) 74 75 #define pte_free(pte) free(pte) 76 static inline pte_t *pte_alloc_one(void) 77 { 78 pte_t *pte = memalign(PAGE_SIZE, PTRS_PER_PTE * sizeof(pte_t)); 79 memset(pte, 0, PTRS_PER_PTE * sizeof(pte_t)); 80 return pte; 81 } 82 static inline pte_t *pte_alloc(pmd_t *pmd, unsigned long addr) 83 { 84 if (pmd_none(*pmd)) { 85 pte_t *pte = pte_alloc_one(); 86 pmd_val(*pmd) = __pa(pte) | PMD_TYPE_TABLE; 87 } 88 return pte_offset(pmd, addr); 89 } 90 91 #endif /* _ASMARM_PGTABLE_H_ */ 92