arch/arm/mm/mm.h

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