xref: /openbmc/linux/arch/arm/mm/mm.h (revision 5e0266f0)
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  extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
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