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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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 */
9extern pmd_t *top_pmd;
10
11extern 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
26static 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
33static 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
39static inline pmd_t *pmd_off_k(unsigned long virt)
40{
41 return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
42}
43
44struct 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
52const struct mem_type *get_mem_type(unsigned int type);
53
54extern 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
74struct static_vm {
75 struct vm_struct vm;
76 struct list_head list;
77};
78
79extern struct list_head static_vmlist;
80extern struct static_vm *find_static_vm_vaddr(void *vaddr);
81extern __init void add_static_vm_early(struct static_vm *svm);
82
83#endif
84
85#ifdef CONFIG_ZONE_DMA
86extern phys_addr_t arm_dma_limit;
87extern 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
93extern phys_addr_t arm_lowmem_limit;
94
95void __init bootmem_init(void);
96void arm_mm_memblock_reserve(void);
97void dma_contiguous_remap(void);
98
99unsigned long __clear_cr(unsigned long mask);