1 #ifdef CONFIG_MMU 2 3 /* the upper-most page table pointer */ 4 extern pmd_t *top_pmd; 5 6 /* 7 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture 8 * specific hacks for copying pages efficiently, while 0xffff4000 9 * is reserved for VIPT aliasing flushing by generic code. 10 * 11 * Note that we don't allow VIPT aliasing caches with SMP. 12 */ 13 #define COPYPAGE_MINICACHE 0xffff8000 14 #define COPYPAGE_V6_FROM 0xffff8000 15 #define COPYPAGE_V6_TO 0xffffc000 16 /* PFN alias flushing, for VIPT caches */ 17 #define FLUSH_ALIAS_START 0xffff4000 18 19 static inline void set_top_pte(unsigned long va, pte_t pte) 20 { 21 pte_t *ptep = pte_offset_kernel(top_pmd, va); 22 set_pte_ext(ptep, pte, 0); 23 local_flush_tlb_kernel_page(va); 24 } 25 26 static inline pte_t get_top_pte(unsigned long va) 27 { 28 pte_t *ptep = pte_offset_kernel(top_pmd, va); 29 return *ptep; 30 } 31 32 static inline pmd_t *pmd_off_k(unsigned long virt) 33 { 34 return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt); 35 } 36 37 struct mem_type { 38 pteval_t prot_pte; 39 pmdval_t prot_l1; 40 pmdval_t prot_sect; 41 unsigned int domain; 42 }; 43 44 const struct mem_type *get_mem_type(unsigned int type); 45 46 extern void __flush_dcache_page(struct address_space *mapping, struct page *page); 47 48 /* 49 * ARM specific vm_struct->flags bits. 50 */ 51 52 /* (super)section-mapped I/O regions used by ioremap()/iounmap() */ 53 #define VM_ARM_SECTION_MAPPING 0x80000000 54 55 /* permanent static mappings from iotable_init() */ 56 #define VM_ARM_STATIC_MAPPING 0x40000000 57 58 /* empty mapping */ 59 #define VM_ARM_EMPTY_MAPPING 0x20000000 60 61 /* mapping type (attributes) for permanent static mappings */ 62 #define VM_ARM_MTYPE(mt) ((mt) << 20) 63 #define VM_ARM_MTYPE_MASK (0x1f << 20) 64 65 /* consistent regions used by dma_alloc_attrs() */ 66 #define VM_ARM_DMA_CONSISTENT 0x20000000 67 68 #endif 69 70 #ifdef CONFIG_ZONE_DMA 71 extern phys_addr_t arm_dma_limit; 72 #else 73 #define arm_dma_limit ((phys_addr_t)~0) 74 #endif 75 76 extern phys_addr_t arm_lowmem_limit; 77 78 void __init bootmem_init(void); 79 void arm_mm_memblock_reserve(void); 80 void dma_contiguous_remap(void); 81