1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifdef CONFIG_MMU 3 #include <linux/list.h> 4 #include <linux/vmalloc.h> 5 #include <linux/pgtable.h> 6 7 /* the upper-most page table pointer */ 8 extern pmd_t *top_pmd; 9 10 extern int icache_size; 11 12 /* 13 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture 14 * specific hacks for copying pages efficiently, while 0xffff4000 15 * is reserved for VIPT aliasing flushing by generic code. 16 * 17 * Note that we don't allow VIPT aliasing caches with SMP. 18 */ 19 #define COPYPAGE_MINICACHE 0xffff8000 20 #define COPYPAGE_V6_FROM 0xffff8000 21 #define COPYPAGE_V6_TO 0xffffc000 22 /* PFN alias flushing, for VIPT caches */ 23 #define FLUSH_ALIAS_START 0xffff4000 24 25 static inline void set_top_pte(unsigned long va, pte_t pte) 26 { 27 pte_t *ptep = pte_offset_kernel(top_pmd, va); 28 set_pte_ext(ptep, pte, 0); 29 local_flush_tlb_kernel_page(va); 30 } 31 32 static inline pte_t get_top_pte(unsigned long va) 33 { 34 pte_t *ptep = pte_offset_kernel(top_pmd, va); 35 return *ptep; 36 } 37 38 struct mem_type { 39 pteval_t prot_pte; 40 pteval_t prot_pte_s2; 41 pmdval_t prot_l1; 42 pmdval_t prot_sect; 43 unsigned int domain; 44 }; 45 46 const struct mem_type *get_mem_type(unsigned int type); 47 48 extern void __flush_dcache_page(struct address_space *mapping, struct page *page); 49 50 /* 51 * ARM specific vm_struct->flags bits. 52 */ 53 54 /* (super)section-mapped I/O regions used by ioremap()/iounmap() */ 55 #define VM_ARM_SECTION_MAPPING 0x80000000 56 57 /* permanent static mappings from iotable_init() */ 58 #define VM_ARM_STATIC_MAPPING 0x40000000 59 60 /* empty mapping */ 61 #define VM_ARM_EMPTY_MAPPING 0x20000000 62 63 /* mapping type (attributes) for permanent static mappings */ 64 #define VM_ARM_MTYPE(mt) ((mt) << 20) 65 #define VM_ARM_MTYPE_MASK (0x1f << 20) 66 67 68 struct static_vm { 69 struct vm_struct vm; 70 struct list_head list; 71 }; 72 73 extern struct list_head static_vmlist; 74 extern struct static_vm *find_static_vm_vaddr(void *vaddr); 75 extern __init void add_static_vm_early(struct static_vm *svm); 76 77 #endif 78 79 #ifdef CONFIG_ZONE_DMA 80 extern phys_addr_t arm_dma_limit; 81 extern unsigned long arm_dma_pfn_limit; 82 #else 83 #define arm_dma_limit ((phys_addr_t)~0) 84 #define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT) 85 #endif 86 87 extern phys_addr_t arm_lowmem_limit; 88 89 void __init bootmem_init(void); 90 void arm_mm_memblock_reserve(void); 91 #ifdef CONFIG_CMA_AREAS 92 void dma_contiguous_remap(void); 93 #else 94 static inline void dma_contiguous_remap(void) { } 95 #endif 96 97 unsigned long __clear_cr(unsigned long mask); 98