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