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 /*
12 * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
13 * specific hacks for copying pages efficiently, while 0xffff4000
14 * is reserved for VIPT aliasing flushing by generic code.
15 *
16 * Note that we don't allow VIPT aliasing caches with SMP.
17 */
18 #define COPYPAGE_MINICACHE 0xffff8000
19 #define COPYPAGE_V6_FROM 0xffff8000
20 #define COPYPAGE_V6_TO 0xffffc000
21 /* PFN alias flushing, for VIPT caches */
22 #define FLUSH_ALIAS_START 0xffff4000
23
set_top_pte(unsigned long va,pte_t pte)24 static inline void set_top_pte(unsigned long va, pte_t pte)
25 {
26 pte_t *ptep = pte_offset_kernel(top_pmd, va);
27 set_pte_ext(ptep, pte, 0);
28 local_flush_tlb_kernel_page(va);
29 }
30
get_top_pte(unsigned long va)31 static inline pte_t get_top_pte(unsigned long va)
32 {
33 pte_t *ptep = pte_offset_kernel(top_pmd, va);
34 return *ptep;
35 }
36
pmd_off_k(unsigned long virt)37 static inline pmd_t *pmd_off_k(unsigned long virt)
38 {
39 return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
40 }
41
42 struct mem_type {
43 pteval_t prot_pte;
44 pteval_t prot_pte_s2;
45 pmdval_t prot_l1;
46 pmdval_t prot_sect;
47 unsigned int domain;
48 };
49
50 const struct mem_type *get_mem_type(unsigned int type);
51
52 extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
53
54 /*
55 * ARM specific vm_struct->flags bits.
56 */
57
58 /* (super)section-mapped I/O regions used by ioremap()/iounmap() */
59 #define VM_ARM_SECTION_MAPPING 0x80000000
60
61 /* permanent static mappings from iotable_init() */
62 #define VM_ARM_STATIC_MAPPING 0x40000000
63
64 /* empty mapping */
65 #define VM_ARM_EMPTY_MAPPING 0x20000000
66
67 /* mapping type (attributes) for permanent static mappings */
68 #define VM_ARM_MTYPE(mt) ((mt) << 20)
69 #define VM_ARM_MTYPE_MASK (0x1f << 20)
70
71 /* consistent regions used by dma_alloc_attrs() */
72 #define VM_ARM_DMA_CONSISTENT 0x20000000
73
74
75 struct static_vm {
76 struct vm_struct vm;
77 struct list_head list;
78 };
79
80 extern struct list_head static_vmlist;
81 extern struct static_vm *find_static_vm_vaddr(void *vaddr);
82 extern __init void add_static_vm_early(struct static_vm *svm);
83
84 #endif
85
86 #ifdef CONFIG_ZONE_DMA
87 extern phys_addr_t arm_dma_limit;
88 extern unsigned long arm_dma_pfn_limit;
89 #else
90 #define arm_dma_limit ((phys_addr_t)~0)
91 #define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
92 #endif
93
94 extern phys_addr_t arm_lowmem_limit;
95
96 void __init bootmem_init(void);
97 void arm_mm_memblock_reserve(void);
98 void dma_contiguous_remap(void);
99
100 unsigned long __clear_cr(unsigned long mask);
101
