arch/arm/mm/mm.h

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