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 */
8extern pmd_t *top_pmd;
9
10extern 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
25static inline void set_top_pte(unsigned long va, pte_t pte)
26{
27 pte_t *ptep = pte_offset_kernel(pmd: top_pmd, address: va);
28 set_pte_ext(ptep, pte, 0);
29 local_flush_tlb_kernel_page(va);
30}
31
32static inline pte_t get_top_pte(unsigned long va)
33{
34 pte_t *ptep = pte_offset_kernel(pmd: top_pmd, address: va);
35 return *ptep;
36}
37
38struct 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
46const struct mem_type *get_mem_type(unsigned int type);
47
48void __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
68struct static_vm {
69 struct vm_struct vm;
70 struct list_head list;
71};
72
73extern struct list_head static_vmlist;
74extern struct static_vm *find_static_vm_vaddr(void *vaddr);
75extern __init void add_static_vm_early(struct static_vm *svm);
76
77#endif
78
79#ifdef CONFIG_ZONE_DMA
80extern phys_addr_t arm_dma_limit;
81extern 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
87extern phys_addr_t arm_lowmem_limit;
88
89void __init bootmem_init(void);
90void arm_mm_memblock_reserve(void);
91#ifdef CONFIG_CMA_AREAS
92void dma_contiguous_remap(void);
93#else
94static inline void dma_contiguous_remap(void) { }
95#endif
96
97unsigned long __clear_cr(unsigned long mask);
98

source code of linux/arch/arm/mm/mm.h