arch/arm/mm/mm.h

   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 void dma_contiguous_remap(void);
  92
  93 unsigned long __clear_cr(unsigned long mask);