1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifdef CONFIG_MMU
3 #include <linux/list.h>
4 #include <linux/vmalloc.h>
5 #include <linux/pgtable.h>
6
7 /* the upper-most page table pointer */
8 extern pmd_t *top_pmd;
9
10 extern int icache_size;
11
12 /*
13 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
14 * specific hacks for copying pages efficiently, while 0xffff4000
15 * is reserved for VIPT aliasing flushing by generic code.
16 *
17 * Note that we don't allow VIPT aliasing caches with SMP.
18 */
19 #define COPYPAGE_MINICACHE 0xffff8000
20 #define COPYPAGE_V6_FROM 0xffff8000
21 #define COPYPAGE_V6_TO 0xffffc000
22 /* PFN alias flushing, for VIPT caches */
23 #define FLUSH_ALIAS_START 0xffff4000
24
25 static inline void set_top_pte(unsigned long va, pte_t pte)
26 {
27 pte_t *ptep = pte_offset_kernel(top_pmd, va);
28 set_pte_ext(ptep, pte, 0);
29 local_flush_tlb_kernel_page(va);
30 }
31
32 static inline pte_t get_top_pte(unsigned long va)
33 {
34 pte_t *ptep = pte_offset_kernel(top_pmd, va);
35 return *ptep;
36 }
37
38 struct mem_type {
39 pteval_t prot_pte;
40 pteval_t prot_pte_s2;
41 pmdval_t prot_l1;
42 pmdval_t prot_sect;
43 unsigned int domain;
44 };
45
46 const struct mem_type *get_mem_type(unsigned int type);
47
48 void __flush_dcache_folio(struct address_space *mapping, struct folio *folio);
49
50 /*
51 * ARM specific vm_struct->flags bits.
52 */
53
54 /* (super)section-mapped I/O regions used by ioremap()/iounmap() */
55 #define VM_ARM_SECTION_MAPPING 0x80000000
56
57 /* permanent static mappings from iotable_init() */
58 #define VM_ARM_STATIC_MAPPING 0x40000000
59
60 /* empty mapping */
61 #define VM_ARM_EMPTY_MAPPING 0x20000000
62
63 /* mapping type (attributes) for permanent static mappings */
64 #define VM_ARM_MTYPE(mt) ((mt) << 20)
65 #define VM_ARM_MTYPE_MASK (0x1f << 20)
66
67
68 struct static_vm {
69 struct vm_struct vm;
70 struct list_head list;
71 };
72
73 extern struct list_head static_vmlist;
74 extern struct static_vm *find_static_vm_vaddr(void *vaddr);
75 extern __init void add_static_vm_early(struct static_vm *svm);
76
77 #endif
78
79 #ifdef CONFIG_ZONE_DMA
80 extern phys_addr_t arm_dma_limit;
81 extern unsigned long arm_dma_pfn_limit;
82 #else
83 #define arm_dma_limit ((phys_addr_t)~0)
84 #define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
85 #endif
86
87 extern phys_addr_t arm_lowmem_limit;
88
89 void __init bootmem_init(void);
90 void arm_mm_memblock_reserve(void);
91 #ifdef CONFIG_CMA_AREAS
92 void dma_contiguous_remap(void);
93 #else
94 static inline void dma_contiguous_remap(void) { }
95 #endif
96
97 unsigned long __clear_cr(unsigned long mask);
98
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.