1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifdef CONFIG_MMU 3 #include <linux/list.h> 4 #include <linux/vmalloc.h> 5 6 #include <asm/pgtable.h> 7 8 /* the upper-most page table pointer */ 9 extern pmd_t *top_pmd; 10 11 /* 12 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture 13 * specific hacks for copying pages efficiently, while 0xffff4000 14 * is reserved for VIPT aliasing flushing by generic code. 15 * 16 * Note that we don't allow VIPT aliasing caches with SMP. 17 */ 18 #define COPYPAGE_MINICACHE 0xffff8000 19 #define COPYPAGE_V6_FROM 0xffff8000 20 #define COPYPAGE_V6_TO 0xffffc000 21 /* PFN alias flushing, for VIPT caches */ 22 #define FLUSH_ALIAS_START 0xffff4000 23 24 static inline void set_top_pte(unsigned long va, pte_t pte) 25 { 26 pte_t *ptep = pte_offset_kernel(top_pmd, va); 27 set_pte_ext(ptep, pte, 0); 28 local_flush_tlb_kernel_page(va); 29 } 30 31 static inline pte_t get_top_pte(unsigned long va) 32 { 33 pte_t *ptep = pte_offset_kernel(top_pmd, va); 34 return *ptep; 35 } 36 37 static inline pmd_t *pmd_off_k(unsigned long virt) 38 { 39 return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt); 40 } 41 42 struct mem_type { 43 pteval_t prot_pte; 44 pteval_t prot_pte_s2; 45 pmdval_t prot_l1; 46 pmdval_t prot_sect; 47 unsigned int domain; 48 }; 49 50 const struct mem_type *get_mem_type(unsigned int type); 51 52 extern void __flush_dcache_page(struct address_space *mapping, struct page *page); 53 54 /* 55 * ARM specific vm_struct->flags bits. 56 */ 57 58 /* (super)section-mapped I/O regions used by ioremap()/iounmap() */ 59 #define VM_ARM_SECTION_MAPPING 0x80000000 60 61 /* permanent static mappings from iotable_init() */ 62 #define VM_ARM_STATIC_MAPPING 0x40000000 63 64 /* empty mapping */ 65 #define VM_ARM_EMPTY_MAPPING 0x20000000 66 67 /* mapping type (attributes) for permanent static mappings */ 68 #define VM_ARM_MTYPE(mt) ((mt) << 20) 69 #define VM_ARM_MTYPE_MASK (0x1f << 20) 70 71 /* consistent regions used by dma_alloc_attrs() */ 72 #define VM_ARM_DMA_CONSISTENT 0x20000000 73 74 75 struct static_vm { 76 struct vm_struct vm; 77 struct list_head list; 78 }; 79 80 extern struct list_head static_vmlist; 81 extern struct static_vm *find_static_vm_vaddr(void *vaddr); 82 extern __init void add_static_vm_early(struct static_vm *svm); 83 84 #endif 85 86 #ifdef CONFIG_ZONE_DMA 87 extern phys_addr_t arm_dma_limit; 88 extern unsigned long arm_dma_pfn_limit; 89 #else 90 #define arm_dma_limit ((phys_addr_t)~0) 91 #define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT) 92 #endif 93 94 extern phys_addr_t arm_lowmem_limit; 95 96 void __init bootmem_init(void); 97 void arm_mm_memblock_reserve(void); 98 void dma_contiguous_remap(void); 99 100 unsigned long __clear_cr(unsigned long mask); 101