LXR linux/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 */
   8extern 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
  23static 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
  30static 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
  36static inline pmd_t *pmd_off_k(unsigned long virt)
  37{
  38        return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
  39}
  40
  41struct 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
  49const struct mem_type *get_mem_type(unsigned int type);
  50
  51extern 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
  74struct static_vm {
  75        struct vm_struct vm;
  76        struct list_head list;
  77};
  78
  79extern struct list_head static_vmlist;
  80extern struct static_vm *find_static_vm_vaddr(void *vaddr);
  81extern __init void add_static_vm_early(struct static_vm *svm);
  82
  83#endif
  84
  85#ifdef CONFIG_ZONE_DMA
  86extern phys_addr_t arm_dma_limit;
  87extern 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
  93extern phys_addr_t arm_lowmem_limit;
  94
  95void __init bootmem_init(void);
  96void arm_mm_memblock_reserve(void);
  97void dma_contiguous_remap(void);
  98
  99unsigned long __clear_cr(unsigned long mask);
 100