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
   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);