1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifdef CONFIG_MMU
3 #include <linux/list.h>
4 #include <linux/vmalloc.h>
5
6 #include <asm/pgtable.h>
7
8 /* the upper-most page table pointer */
9 extern pmd_t *top_pmd;
10
11 extern int icache_size;
12
13 /*
14 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
15 * specific hacks for copying pages efficiently, while 0xffff4000
16 * is reserved for VIPT aliasing flushing by generic code.
17 *
18 * Note that we don't allow VIPT aliasing caches with SMP.
19 */
20 #define COPYPAGE_MINICACHE 0xffff8000
21 #define COPYPAGE_V6_FROM 0xffff8000
22 #define COPYPAGE_V6_TO 0xffffc000
23 /* PFN alias flushing, for VIPT caches */
24 #define FLUSH_ALIAS_START 0xffff4000
25
set_top_pte(unsigned long va,pte_t pte)26 static inline void set_top_pte(unsigned long va, pte_t pte)
27 {
28 pte_t *ptep = pte_offset_kernel(top_pmd, va);
29 set_pte_ext(ptep, pte, 0);
30 local_flush_tlb_kernel_page(va);
31 }
32
get_top_pte(unsigned long va)33 static inline pte_t get_top_pte(unsigned long va)
34 {
35 pte_t *ptep = pte_offset_kernel(top_pmd, va);
36 return *ptep;
37 }
38
pmd_off_k(unsigned long virt)39 static inline pmd_t *pmd_off_k(unsigned long virt)
40 {
41 return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
42 }
43
44 struct mem_type {
45 pteval_t prot_pte;
46 pteval_t prot_pte_s2;
47 pmdval_t prot_l1;
48 pmdval_t prot_sect;
49 unsigned int domain;
50 };
51
52 const struct mem_type *get_mem_type(unsigned int type);
53
54 extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
55
56 /*
57 * ARM specific vm_struct->flags bits.
58 */
59
60 /* (super)section-mapped I/O regions used by ioremap()/iounmap() */
61 #define VM_ARM_SECTION_MAPPING 0x80000000
62
63 /* permanent static mappings from iotable_init() */
64 #define VM_ARM_STATIC_MAPPING 0x40000000
65
66 /* empty mapping */
67 #define VM_ARM_EMPTY_MAPPING 0x20000000
68
69 /* mapping type (attributes) for permanent static mappings */
70 #define VM_ARM_MTYPE(mt) ((mt) << 20)
71 #define VM_ARM_MTYPE_MASK (0x1f << 20)
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