arch/arm/mm/mm.h

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