mm.h

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#ifdef CONFIG_MMU

/* 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;
    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

#endif

#ifdef CONFIG_ZONE_DMA
extern phys_addr_t arm_dma_limit;
#else
#define arm_dma_limit ((phys_addr_t)~0)
#endif

extern phys_addr_t arm_lowmem_limit;

void __init bootmem_init(void);
void arm_mm_memblock_reserve(void);
void dma_contiguous_remap(void);