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kernel/linux-imx6_3.14.28/arch/arm/mm/mm.h 2.33 KB
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  #ifdef CONFIG_MMU
  #include <linux/list.h>
  #include <linux/vmalloc.h>
  
  /* the upper-most page table pointer */
  extern pmd_t *top_pmd;
  
  /*
   * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
   * specific hacks for copying pages efficiently, while 0xffff4000
   * is reserved for VIPT aliasing flushing by generic code.
   *
   * Note that we don't allow VIPT aliasing caches with SMP.
   */
  #define COPYPAGE_MINICACHE	0xffff8000
  #define COPYPAGE_V6_FROM	0xffff8000
  #define COPYPAGE_V6_TO		0xffffc000
  /* PFN alias flushing, for VIPT caches */
  #define FLUSH_ALIAS_START	0xffff4000
  
  static inline void set_top_pte(unsigned long va, pte_t pte)
  {
  	pte_t *ptep = pte_offset_kernel(top_pmd, va);
  	set_pte_ext(ptep, pte, 0);
  	local_flush_tlb_kernel_page(va);
  }
  
  static inline pte_t get_top_pte(unsigned long va)
  {
  	pte_t *ptep = pte_offset_kernel(top_pmd, va);
  	return *ptep;
  }
  
  static inline pmd_t *pmd_off_k(unsigned long virt)
  {
  	return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
  }
  
  struct mem_type {
  	pteval_t prot_pte;
  	pteval_t prot_pte_s2;
  	pmdval_t prot_l1;
  	pmdval_t prot_sect;
  	unsigned int domain;
  };
  
  const struct mem_type *get_mem_type(unsigned int type);
  
  extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
  
  /*
   * ARM specific vm_struct->flags bits.
   */
  
  /* (super)section-mapped I/O regions used by ioremap()/iounmap() */
  #define VM_ARM_SECTION_MAPPING	0x80000000
  
  /* permanent static mappings from iotable_init() */
  #define VM_ARM_STATIC_MAPPING	0x40000000
  
  /* empty mapping */
  #define VM_ARM_EMPTY_MAPPING	0x20000000
  
  /* mapping type (attributes) for permanent static mappings */
  #define VM_ARM_MTYPE(mt)		((mt) << 20)
  #define VM_ARM_MTYPE_MASK	(0x1f << 20)
  
  /* consistent regions used by dma_alloc_attrs() */
  #define VM_ARM_DMA_CONSISTENT	0x20000000
  
  
  struct static_vm {
  	struct vm_struct vm;
  	struct list_head list;
  };
  
  extern struct list_head static_vmlist;
  extern struct static_vm *find_static_vm_vaddr(void *vaddr);
  extern __init void add_static_vm_early(struct static_vm *svm);
  
  #endif
  
  #ifdef CONFIG_ZONE_DMA
  extern phys_addr_t arm_dma_limit;
  extern unsigned long arm_dma_pfn_limit;
  #else
  #define arm_dma_limit ((phys_addr_t)~0)
  #define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
  #endif
  
  extern phys_addr_t arm_lowmem_limit;
  
  void __init bootmem_init(void);
  void arm_mm_memblock_reserve(void);
  void dma_contiguous_remap(void);