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
set_top_pte(unsigned long va,pte_t pte)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
get_top_pte(unsigned long va)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
pmd_off_k(unsigned long virt)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);
100