1#ifdef CONFIG_MMU
 2
 3/* the upper-most page table pointer */
 4extern 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
19static 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
26static 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
32static inline pmd_t *pmd_off_k(unsigned long virt)
33{
34	return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
35}
36
37struct mem_type {
38	pteval_t prot_pte;
39	pmdval_t prot_l1;
40	pmdval_t prot_sect;
41	unsigned int domain;
42};
43
44const struct mem_type *get_mem_type(unsigned int type);
45
46extern 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/* empty mapping */
59#define VM_ARM_EMPTY_MAPPING	0x20000000
60
61/* mapping type (attributes) for permanent static mappings */
62#define VM_ARM_MTYPE(mt)		((mt) << 20)
63#define VM_ARM_MTYPE_MASK	(0x1f << 20)
64
65#endif
66
67#ifdef CONFIG_ZONE_DMA
68extern phys_addr_t arm_dma_limit;
69#else
70#define arm_dma_limit ((phys_addr_t)~0)
71#endif
72
73extern phys_addr_t arm_lowmem_limit;
74
75void __init bootmem_init(void);
76void arm_mm_memblock_reserve(void);
77void dma_contiguous_remap(void);