arch/arm/mm/mm.h

   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
  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
  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
  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);