xref: /openbmc/linux/arch/arm/mm/mm.h (revision a20eefae)
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 
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 
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 
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 /* consistent regions used by dma_alloc_attrs() */
74 #define VM_ARM_DMA_CONSISTENT	0x20000000
75 
76 
77 struct static_vm {
78 	struct vm_struct vm;
79 	struct list_head list;
80 };
81 
82 extern struct list_head static_vmlist;
83 extern struct static_vm *find_static_vm_vaddr(void *vaddr);
84 extern __init void add_static_vm_early(struct static_vm *svm);
85 
86 #endif
87 
88 #ifdef CONFIG_ZONE_DMA
89 extern phys_addr_t arm_dma_limit;
90 extern unsigned long arm_dma_pfn_limit;
91 #else
92 #define arm_dma_limit ((phys_addr_t)~0)
93 #define arm_dma_pfn_limit (~0ul >> PAGE_SHIFT)
94 #endif
95 
96 extern phys_addr_t arm_lowmem_limit;
97 
98 void __init bootmem_init(void);
99 void arm_mm_memblock_reserve(void);
100 void dma_contiguous_remap(void);
101 
102 unsigned long __clear_cr(unsigned long mask);
103